Catalogue 9 - STAUFF Filtration Technology

Replacement Filter Elements Return-Line Filters Offline and Bypass Filters Catalogue 9 STAUFF Filtration Technology Pressure Filters In-Line Filters Spin-On Filters Filtration Systems

Please note: Unless otherwise stated, all data and figures in this product catalogue are approximate values and are only valid as references, which are not binding (also in respect to any third parties’ rights of protection) and thus do not release the customer / user from checking and testing the suitability of the products for the foreseen purposes. Therefore, data and figures can only be used in a limited sense for construction purposes. The application of the products is beyond the control possibilities of the manufacturer and, therefore, is exclusively subject to the responsibility of the customer / user. In the event that a liability is nevertheless considered, any compensation will be limited to the value of the goods supplied by the manufacturer and used by the customer / user. As a matter of course, the manufacturer guarantees the perfect quality of all products in accordance with the General Terms and Conditions of Business and Sale. Subject to modifications due to the ongoing development and improvement of the products. With the publication of this product catalogue, previous editions are no longer valid. Germany Walter Stauffenberg GmbH & Co. KG Im Ehrenfeld 4 58791 Werdohl www.stauff.com STAUFF products and services are globally available through wholly-owned subsidiaries and a tight network of authorised distributors and representatives in all major industrial regions of the world. You can find detailed contact information on the last two pages of this product catalogue or at www.stauff.com/contact.

3 www.stauff.com/9/en/#3 Filtration Guideline Replacement Filter Elements Pressure Filters Return-Line Filters In-Line Filters Offline and Bypass Filters Introduction 4 - 11 12 - 23 24 - 33 34 - 65 66 - 125 126 - 147 148 - 177 Spin-On Filters 178 - 205 A B C D E F G H Filtration Systems 206 - 209 Appendix (Product-Specific Abbreviations / Global Contact Directory) 210 - 215 Catalogue 9 § Edition 06/2024 Introduction

4 www.stauff.com/9/en/#4 Catalogue 9 § Edition 06/2024 Introduction Catalogue 1 STAUFF Clamps Catalogue 2 STAUFF Connect Catalogue 3 STAUFF Flanges Catalogue 4 STAUFF Hose Connectors Catalogue 5 STAUFF Quick Release Couplings Catalogue 6 STAUFF Valves § Block Clamps § Special Clamps § Light Series Clamps § Saddle Clamps § U-Bolt Clamps § Metal Clamps § Construction Series § Tube Connectors § Assembly Tools and Devices § SAE Flanges § Gear Pump Flanges § Hose Connectors § High-Pressure Hose Connectors § Push-to-Connect Couplings § Multi Couplings § Screw-to-Connect Couplings § Two-Way Ball Valves § Multi-Way Ball Valves § Flow Control and Check Valves § Gauge Isolator Valves

5 www.stauff.com/9/en/#5 Catalogue 9 § Edition 06/2024 Introduction Catalogue 7 STAUFF Test Catalogue 8 STAUFF Diagtronics Catalogue 9 STAUFF Filtration Technology Catalogue 10 STAUFF Hydraulic Accessories § Test Couplings § Test Adaptors § Test Hoses and Connectors § Pressure Gauges § Hydraulic Testers § Oil Analysis Equipment § Replacement Filter Elements § Pressure Filters § Return-Line Filters § In-Line Filters § Spin-On Filters § Offline and Bypass Filters § Filtration Systems § Fluid Level and Temperature Indicators § Tank Filler Breathers § Giant and Desiccant Air Breathers § Suction Strainers § Diffusors

6 www.stauff.com/9/en/#6 Catalogue 9 § Edition 06/2024 Introduction STAUFF LINEComponents With the seven dedicatedSTAUFF Line product groups § STAUFF Clamps § STAUFF Connect § STAUFF Flanges § STAUFF Hose Connectors § STAUFF Quick Release Couplings § STAUFF Valves § STAUFF Test from own, in-house development and manufacturing, the companies of the STAUFF Group provide a comprehensive range of components for fastening and connecting pipes, tubes and hoses for mobile and industrial hydraulic applications and many other industries. The portfolio is completed by components for shutting-off, regulating, throttling and measuring fluid media. In order to perfectly match each other, STAUFF Line products are designed and offered on a high, uniform level of quality. A large proportion of the range made from steel comes as standard with the premium STAUFF Zinc/Nickel surface coating, which is also optionally available for many of the other components. This coating offers the most reliable surface protection far beyond the previous market standards – even after transport, handling and assembly of the components – and meets all current legal requirements. If desired, Original Equipment Manufacturers can be supported with value-added services, from technical consultation to pre-assembly, assembly and kitting as well as logistics services : § Support with the selection of suitable standard components and ordering options; provision of customised solutions according to customer’s specifications or based on our in-house development – from prototyping to large scale production § Analysis and optimizationof existing and design and developments of new systems aimed at increasing the efficiency and performance of machines and equipment and creating value for customers by reducing the total cost § Pre-assembly, assembly and kitting of individual components to customer-specific system modules § Individually coordinatedprocurement solutions (e.g. web shop and electronic data interchange) and supply models (e.g. from warehousing of customised components to Kanban logistics and just-in-time delivery of pre-fabricated system modules to the assembly lines of the customers) aimed at optimising material flows For more than 50 years, the companies of STAUFF Group have been developing, manufacturing and distributing pipework equipment and hydraulic components for mechanical and plant engineering and for service and industrial maintenance. In addition to mobile and industrial hydraulic machinery, typical applications also include commercial and special purpose vehicles, rail transportation and energy technology. Likewise, STAUFF products are used in marine, oil and gas applications and in the process, food and chemical industries. The overall range currently includes about 50000 standard products as well as numerous special and system solutions according to customer’s specifications or based on our in-house development. All STAUFF products undergo relevant testing in accordance with international regulations and are governed by the high standards of the in-house quality management system. Furthermore, many items have received certifications and approvals from various international institutes, organisations and authorities who have independently confirmed the quality and performance of the products. Wholly-owned manufacturing, sales and service facilities in 18 countries and a tight global network of authorised distribution partners ensure high presence and service paired with a maximum of availability. Quality Management – ISO 9001:2015 Environmental Management – ISO 14001:2015 Safety Management – ISO 45001:2018 Energy Management – ISO 50001:2018

7 www.stauff.com/9/en/#7 Catalogue 9 § Edition 06/2024 Introduction Aligned with the needs of the market, the product groups § STAUFF Test § STAUFF Diagtronics § STAUFF Filtration Technology § STAUFF Hydraulic Accessories include a comprehensive range of analogue and digital measuring equipment and devices, filtration systems and replacement filter elements as well as accessories for the construction of tanks, reservoirs, power packs and gear boxes in mobile and industrial hydraulics. The offer is completed by relevant value-added services: § Support with the selection of suitable components and ordering options; provision of customised solutions according to customer’s specifications or based on our in-house development – from prototyping to large scale production § Analysis of existing hydraulic circuits aimed at filtration systems, tank components and monitoring devices that perfectly match to the specific requirements, and developing integrated concepts to increase the efficiency and performance of machines and equipment § Individually coordinatedprocurement solutions and supply models

8 www.stauff.com/9/en/#8 Catalogue 9 § Edition 06/2024 Introduction STAUFF Filtration Technology The STAUFF Filtration Technology product range contains an extensive product range in the areas of filtration and purification of oils and other media, which fully meets – or even exceeds – the requirements of modern service and maintenance of machines and equipment. As an experienced manufacturer, STAUFF provides quick and direct access to a complete range of replacement filter elements for industrial liquids such as hydraulic and lubrication oils, heavy fuels, water, chemicals, coolants and other media – equal in form, fit and function to the original products while maintaining or surpassing their performance. Flexible manufacturing lines and extensive stock-keeping in the country of destination guarantee fast reaction times and shortest delivery times. STAUFF guarantees prompt service, even for customised solutions according to customer’s specifications or based on our in-house development. STAUFF filter housings and systems can be installed in the pressure, suction of return line. They are already planned in suitable positions in the hydraulic circuit during the design phase of a machine, or added at a later stage in the course of retrofitting or upgrading. Offline and bypass filters, which are either used as portable units or installed permanently, complete the product portfolio.

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10 www.stauff.com/9/en/#10 Catalogue 9 § Edition 06/2024 Introduction The STAUFF online catalogue centre at www.stauff.com/catalougues provides fast and direct access to digital versions of this as well as other STAUFF product catalogues in all available languages. www.stauff.com/catalogues Online Page-Flip Catalogues § Easy navigation through index or the powerful full text search functionality § Contents can be shared and forwarded by e-mail, printed or downloaded and saved in PDF file format § Also suitable for mobile devices Download Catalogues § Download entire product catalogues and save them in PDF file format The fastest way to the online page-flip catalogue: The links that can be found at the bottom edge of all pages of this product catalogue will lead you directly to the corresponding page in the online page-flip catalogue. In doing so, contents can be searched, shared and forwarded by e-mail, printed or downloaded and saved in PDF file format. Scan the QR code next to the direct link with the camera of your mobile device* and also use the functions in this way. * may require a suitable app 10 www.stauff.com/9/en/#10 Catalogue 9 § Edition 06/2024

11 www.stauff.com/9/en/#11 Catalogue 9 § Edition 06/2024 Introduction With the STAUFF Digital Platform available at www.stauff.com, commercial customers and users of STAUFF products can not only inform themselves in all detail about the 50000 components typically available from stock, but also directly purchase these online without complex registration. General information about the companies of STAUFF Group, latest business and product news as well as complete global contact details also be available. Immediate access to and free download of 3D models and 2D drawings for a growing number of STAUFF products www.stauff.com www.stauff.com/cad www.filterinterchange.com Online database for the quick and easy identification and interchange of almost all common brands and types of replacement filter elements Main Functionalities of the STAUFF Digital Platform: Around the clock Check stock availability and pricing for STAUFF products in real time Cross references Search by article designations of other manufacturers / suppliers Live chat Get directly in touch with the STAUFF customer service and sales team CAD database Download 3D models and 2D drawings for STAUFF products Advantages as a Registered User of the STAUFF Digital Platform: Purchase STAUFF products Taking customer-specific pricing and delivery conditions into account Ordering w/o searching Quick ordering by entering article number, quantity and requested delivery date File upload Direct upload of orders with multiple positions in CSV or Excel file format Notepad function Create project lists to save interesting products for later Follow STAUFF and keep yourself updated: Linkedin www.linkedin.com/company/stauff Youtube www.youtube.com/stauffgroup STAUFF Newsletters Automatic e-mail notifications about latest news from STAUFF www.stauff.com/newsletter

A www.stauff.com/9/en/#13 13 Catalogue 9 § Edition 06/2024 Filtration Guideline Filtration Guideline Filtration - Why? 15 15 16 - 17 18 Contamination STAUFF Filter Components Test Standards and Oil Purity 19 12 - 23 20 - 21 22 - 23 19 Short & Curt: Filter Rating ß-Value and Separations Efficiency Filtration Terminology Choice of Filters / Examples of Calculation

A 14 www.stauff.com/9/en/#14 Catalogue 9 § Edition 06/2024 Filtration Guideline

A www.stauff.com/9/en/#15 15 Contamination Particle Sizes (Selection) ƒ 100 µm table salt, fine sand ƒ 75 µm diameter of a human hair ƒ 60 µm flower pollen ƒ 50 µm fog ƒ 30 µm (from approx.) resolution of the human eye ƒ 15 µm fine particles ƒ 7 µm red blood cells ƒ 2 µm bacteria ƒ 1 µm layer of lubricating film (for comparison) Type of Contamination The most frequent ones are: ƒ Solid particles ƒ Free and dissolved water ƒ Non-dissolved air A majority of the contamination can be removed with filtration. 75 30 15 5 1 Diameter of a human hair Particles Diameter in µm 1. Solid particles 2. Free and dissolved water 3. Non-dissolved air (in the hydraulic oil) Suspended solids Flow direction Origin of Contamination The main cause of failures and downtimes is dirt in the hydraulic system. Failure analysis indicate that 80% of the failures are caused by faults in the hydraulic system. 90% of them are caused by impurities in the hydraulic oil. Sources of External Contamination ƒ Filling and refilling the hydraulic tank ƒ Inadequately dimensioned breathers ƒ Damaged tank seals ƒ Replacement of hydraulic lines and components (pumps, cylinders) ƒ Impurities in the air Types of Internal Contamination ƒ Contamination on / in the components caused by the manufacturing process (e.g. chips) ƒ Contamination on the components caused by the installation of the components Sources of Internal Contamination ƒ Disintegration of particles from high pressure changes and tension on the surface of hydraulic components (e.g. cavitation) ƒ Material erosion that occurs at places in the hydraulic units due to the impact of pressurised liquid at high speeds (erosion wear) Filtration - Why? Good hydraulic filtration is gaining more and more importance in the use of hydraulic systems. Reducing contamination in the hydraulic system will reduce the wear of the components and thus extend the service life of the machine. This will prevent production downtime and lower the overall production costs. Right from the beginning, there is contamination in a new hydraulic system, which reduces the service life of the system and its components such as valves and cylinders without any or with inadequate filtration. This built-in dirt is created during the manufacturing of the components and mainly consists of coarse particles. In addition to the contamination that arises during operation of the system, e.g. abrasive wear, dirt particles can also get into the system when it is filled with hydraulic oil. This is called ingress contamination. Choosing the right filter contributes significantly to prevent the dangers mentioned above thereby ensuring efficient operation even after many years. Reduction of Contamination ƒ Extension of service life ƒ Extension of maintenance intervals ƒ Reduction of machine downtime ƒ Reduction of environmental pollution uCost savings for the user Lubricating film Catalogue 9 § Edition 06/2024 Filtration Guideline

A 16 www.stauff.com/9/en/#16 STAUFF Laser Particle Counter LasPaC-II and Bottle Sampler “Hydraulic System” (valves, cylinders, accumulators, motors ...) A B a h c f e g b a b c d k e f h i g Selection of Components within the Hydraulic Circuit a STAUFF Mobile Filter System SMFS-U b STAUFF Plastic Filler Breather SPB c STAUFF Return-Line Filter RF d STAUFF Diffusor SRV e STAUFF Suction Strainer SUS f STAUFF Pressure Filter SF g STAUFF Desiccant Air Breather SDB h STAUFF Offline Filter OLS i STAUFF Level Gauge SNA j STAUFF Spin-On Filter SSF k Oil tank l STAUFF Reader PT-RF m STAUFF Pressure Transmitter PT-RF n STAUFF Hydraulic Tester PPC o STAUFF Particle Monitor LPM-II p STAUFF Laser Particle Counter LasPac-II q STAUFF Pressure Gauge SPG r STAUFF Test Coupling SMK / SKK j Catalogue 9 § Edition 06/2024 Filtration Guideline d l m n p o q r

A www.stauff.com/9/en/#17 17 Pressure Filters Series SF / SF-TM / SFZ / SFA / SMPF (see page 34 - 35) STAUFF Filter Components Return-Line Filters Series RF / RFA / RFB / RFS / RTF (see page 66 - 125) Diffusers / Suction Strainers / Filler Breathers / Desiccant Air Breathers (see Catalogue No. 10 - Hydraulic Accessories) Offline and Bypass Filters / Mobile Filter Units (see page 178 - 209) Spin-On Filters (see page 148 - 177) Pressure Filtersf are placed behind the pump and clean the hydraulic oil before it flows through down-stream components like valves, cylinders and so on. The main reason for pressure filtration is the protection of downstream, sensitive components. Eroded particles from the pump are immediately filtered out of the hydraulic oil. Besides working as a protection filter, Pressure Filters also help to maintain the required purity class. Because it is placed right behind the pump, a Pressure Filter has to withstand the maximum system pressure. The filter element in the Pressure Filter also has to withstand the loads and is more intricately constructed, for example as a Return-Line Filters element. Return-Line Filtersc are installed in the Return-Line, on top of or within the oil tank. They filter the hydraulic oil before it flows back into the reservoir. This ensures that contamination arising in the components does not get into the tank. Return-Line Filters maintain the targeted purity class like Pressure Filters. However, because of their arrangement, they do not fulfil the additional function of a protection filter. In contrast to a Pressure Filter, it only has to withstand low pressure levels. Diffusersd are used in combination with Return-Line Filters and ensure that the returning oil flow is settled before it reaches the oil tank thereby preventing foaming and re-suspension of deposited dirt. The job ofSuction Strainerse is mainly to provide functional protection of the downstream pumps in the circulation. Suction Strainers always have to be provided if the risk of pump damage from coarse impurities is particularly high. This risk exists if impurities are collected in the tank and if they can’t be filtered out afterwards. Suction Strainers are coarse filter elements with a micron rating that is usually bigger than 100 µm. Filler Breathersb are mounted on the oil tank and prevent the entry of dirt from the surroundings during tank breathing. They should be chosen with a filter unit that is similar to the working filter (Pressure Filter, Return-Line Filter). The replacement cycles of filter inserts is highly dependent on the surrounding conditions of the hydraulic system. Another variant of the breather is theDesiccant Air Breatherg . The additional function of this filter is dehumidification of the inflowing air with a special silicate gel. Offline / Bypass Filtersh / a are not part of the main hydraulic system. They are supplementary to achieve the best possible filtration results. Because of the high efficiency of the Offline / Bypass Filters, purity levels are reached that cannot be achieved with conventional main filter systems. Offline Filterswork with an integrated motor / pump unit that draws in the fluid from the system, filters it and then feeds it back into the tank. Because the offline filter is independent from the hydraulic main circuit, i.e. it can still be operated if the hydraulic system is switched off, it is used in practice for continuous cleaning of the tank. Bypass Filters on the other hand use the existing system pressure to draw a small volumetric flow out of the hydraulic system for filtration. They are only active while the unit is in operation. Another mobile variant of the bypass filter is theMobile Filter Systema . STAUFF provides a complete range ofSpin-On Filtersjwhich can be used either as Suction Filters or as Return-Line filters for low pressure applications. Catalogue 9 § Edition 06/2024 Filtration Guideline

A 18 www.stauff.com/9/en/#18 Test Standards and Oil Purity Definition of the Required Micron Rating Essentially, the components found in the hydraulic system determine the micron rating of the filtration system. To guarantee a reliable mode of operation over the years, it is mandatory to maintain the optimum oil purity class for specific components. The most sensitive component determines the choice of filter material and micron rating. To determine the oil purity according to ISO 4406 (1999), a laser particle counter is used to count particles that are >4 µm (c) , >6 µm (c) and >14 µm (c) in 100 ml of hydraulic oil. The number of particles is then assigned with a classification number (e.g. 14/11/8) that then corresponds to the ISO purity class. Please note here that the number of particles doubles for the next higher class. The cleanliness level that has to be achieved is an important criterion for choosing the right filtration system. STAUFF Filter Elements are subject to the following Test Methods ƒ ISO 2941 Collapse and burst resistance ƒ ISO 2942 Verification of fabrication integrity (bubble point test) ƒ ISO 2943 Compatibility with hydraulic media ƒ ISO 3723 End load test ƒ ISO 3724 Flow fatigue characteristics ƒ ISO 3968 Flow characteristics ƒ ISO 16889 Filtration performance test (multi-pass method) Multipass Test Bench Number of particles in 100 ml fluid Classification numbers ISO 4406 (1999) More than Less than > 4 µm (c) > 6 µm (c) > 14 µm (c) 16000000 32000000 25 25 25 8000000 16000000 24 24 24 4000000 8000000 23 23 23 2000000 4000000 22 22 22 1000000 2000000 21 21 21 500000 1000000 20 20 20 250000 500000 19 19 19 130000 250000 18 18 18 64000 130000 17 17 17 32000 64000 16 16 16 16000 32000 15 15 15 8000 16000 14 14 14 4000 8000 13 13 13 2000 4000 12 12 12 1000 2000 11 11 11 500 1000 10 10 10 250 500 9 9 9 130 250 8 8 8 64 130 7 7 7 32 64 6 6 6 16 32 5 5 5 Catalogue 9 § Edition 06/2024 Filtration Guideline

A www.stauff.com/9/en/#19 19 ß-Value and Separations Efficiency To select filtration that meet the requirements, performance characteristics like the filter fineness, the filtration efficiency, the dirt-hold capacity and the pressure loss has to be observed. The ß-value as per ISO 16889 is the relevant characteristic value for the filtration efficiency. The ß-value is the ratio of particles before (Nup x ) and after (Ndown x ) the filter related to a specific particle size x. ßx = Nup x Ndown x ß10 > 200 means that of 1000 particles that are 10 μm in size, only five particles can pass through the filter. 995 particles will be trapped by the filter element. Popular filters with inorganic glass fibre medium have to achieve a ß-value of at least 200 in order to meet the demands placed on hydraulic filtration today. The filtration efficiency, also called the retention rate, is directly related to the ß-value and is calculated as follows: E = (ßx - 1) ßx ß10 > 200 corresponds to filtration efficiency of 99,5%. ß-value Filtration Efficiency E 1 0,00 % 2 50,00 % 10 90,00 % 25 96,00 % 50 98,00 % 75 98,67 % 100 99,00 % 200 99,50 % 1000 99,90 % 9999 99,99 % Thedirt-hold capacity (DHC) shows how much solid dirt a filter element can hold before it has to be replaced. The dirt-hold capacity is therefore the most important parameter in the filter service life. Thedifferential pressure (Δp) is another important criterion for the configuration of the filter. Ensure that the size of the filter element is chosen according to the calculation guideline by STAUFF. To guarantee optimum filtration, the ß-value, the dirt-hold capacity (DHC) and the differential pressure (Δp) must be carefully matched. Comparison of the ß-Value and Efficiency E (each related to a defined Particle Size) Type Component ISO 4406 Code Recommended Filter Rating Pump Piston Pump (Slow Speed, Inline) 22/20/16 20 µm Gear Pump 19/17/15 20 µm Vane Pump 18/16/14 5 µm Piston Pump (High Speed, Variable) 17/15/13 5 µm Motor Gear Motor 20/18/15 20 µm Vane Motor 19/17/14 10 µm Radial Piston Motor 19/17/13 10 µm Axial Piston Motor 18/16/13 5 µm Valve Directional Valves (Solenoid) 20/18/15 20 µm Check Valves 20/18/15 20 µm Logic Valves 20/18/15 20 µm Cartridge Valves 20/18/15 20 µm Pressure Control Valves (Modulating) 19/17/14 10 µm Flow Control Valves 19/17/14 10 µm Standard Hydraulic <100 bar / <1450 PSI 19/17/14 10 µm Proportional Valves 18/16/13 5 µm Servo Valves <210 bar / <3045 PSI 16/14/11 3 µm Servo Valves >210 bar / >3045 PSI 15/13/10 3 µm Actuator Cylinder 20/18/15 20 µm Short & Curt: Filter Rating (For exact recommendation see SCCP - STAUFF Contamination Control Program see on page 15) STAUFF Laser Particle Counter LasPaC-II, LPM-II and Bottle Sampler Catalogue 9 § Edition 06/2024 Filtration Guideline

A 20 www.stauff.com/9/en/#20 Filtration Terminology ß-value The ß-value as per ISO 16889 is the relevant characteristic value for filtration efficiency. The ß-value is the ratio of particles before (Nup x ) and after (Ndown x ) the filter related to a specific particle size x. ßx = Nup x (see page 19) Ndown x Cavitation Damage Cavitation is defined to be the cavity formation in liquids. Cavitation occurs if the local static pressure of a liquid drops below a critical value. This critical value usually corresponds to the vapour pressure of the liquid. Critical effects of cavitation are: ƒ Cavitation wear ƒ Undissolved gas in the hydraulic system ƒ Loud high-frequency noises ƒ Local high temperatures in the liquid ƒ Changes to the resistance characteristics of the hydraulic resistance Cleanliness Level The cleanliness level of a hydraulic fluid is defined by the number of solid particles per ml of fluid. The number of particles is usually measured with an automatic particle counter. The cleanliness level is determined by a class code created by counting the number of particles of different sizes. Particle counting as well as the coding of the cleanliness class for hydraulic oils are described in the ISO 4406 (1999) standard. Beside the ISO 4406 (1999), NAS 1638 (1964) and SAE AS4059 Rev. D (2001) are also still common. Clogging Indicator The clogging indicator signalises a specific pressure level where the soiled filter element should be replaced. They work with differential pressure (Δp) or back pressure. Clogging indicators are available in visual, electrical and visual / electrical versions. While it is the responsibility of the installation or maintenance personnel to check the degree of clogging of the filter element with visual clogging indicators, a signal contact (switch) can be connected to the machine controller with an electrical or visual / electrical clogging indicator. Collapse Pressure The permissible collapse pressure according to ISO 2941 is understood to be the pressure difference that a filter element can withstand with the stipulated direction of flow. Exceeding the collapse pressure results in the destruction of the filter element. Depth Filter Impurities penetrate into the filter fabric and are retained by the structure of the filter fabric. Mainly cellulose and inorganic glass fibre media are used in hydraulic filters. For special applications, Plastic Media (high-strength) and Stainless Fibre media are also used. The design of the depth filter combines the highest micron rating with a high dirt retention capacity. Due to the fleece-like structure of depth filters, particles are not only separated on the surface of the filter material, but they can penetrate into the filter material, which leads to a considerable increase of the effective filter area. In contrast to sieves, there are no holes in fleece, rather they practically consist of labyrinths in which the particles are trapped. Hence, there is no sharply defined screening, rather a wide range of particles are trapped. Differential Pressure The differential pressure (Δp) is defined as the pressure difference between the filter inlet and the filter outlet, or alternatively in front of and behind the filter element. Exceeding the maximum permissible pressure differential leads to the destruction of the filter element. An integrated bypass valve in the filter prevents destruction of the filter element by opening if the differential pressure (Δp) is too high. Then the oil is passed unfiltered into the hydraulic circuit. For applications in which no unfiltered oil is allowed to pass into the hydraulic circuit, there is the possibility of using filters without bypass valves with filter elements that can withstand a high differential pressure (Δp). The filter elements must be designed such that they can withstand the maximum expected differential pressure (Δp). Dirt-Hold Capacity (DHC) The dirt-hold capacity (DHC) shows how much solid dirt a filter element can hold. It is measured in the multipass test according to ISO 16889. Filter A filter (hydraulic filter) has the job of keeping solids out of a liquid (oil). A filter is usually made of an filter housing and a filter element. Filter Area The filter area is the size of the theoretically spread-out filter element. The larger the filter area, the lower the flow resistance of the filter element. Simultaneously, the dirt-hold capacity (DHC) increases. The following applies in general: the larger the filter area, the longer the service life of the element. Basically the filter area can be enlarged by the number of pleats. Filter Cake A filter cake is made up of the particles trapped on the surface of a filter medium. Filter Design Essentially depends on the following factors: specific flow rate, cleanliness level, amount of contamination, the maximum pressure setting and the required filter service life. Filter Element The filter element is located in the filter housing and performs the actual filtering task. Filtration Efficiency Filtration efficiency E is a measure of the effectiveness of a filter element for separating solid particles. It is given in percent. Filter Housing Depending on the application, the filter housing is built into the pressure or Return-Line and must be designed for the specific operating or system pressure and the flow rate. The filter element is located in the filter housing. Depending on the application, the filter housing may be equipped with a bypass valve, a reversing valve, a clogging indicator and other options. Filter Material The choice of the right filter material is dependent on different criteria. Amongst others, this includes the type of application, the filter function, degree of contamination or alternatively the required dirt-hold capacity (DHC) as well as requirements of chemical or physical resistance. The following list gives you an overview of how these filter materials differ with regard to specific properties: Inorganic Glass Fibre Inorganic Glass Fibre media are among the most important materials in modern filtration. During production, selected fibres (1 mm ... 5 mm long and with a diameter of 3 µm ... 10 µm) are processed into a specific mix. The manufacturing process is very similar to paper production. The fibres are bound with a resin and impregnated. The benefit compared to cellulose paper is a fibre structure that is considerably more homogenous and consequently has larger open pored surfaces. As a result, lower flow resistance is achieved. ƒ Based on Glass Fibres with acrylic or epoxy resin binding ƒ High retention and dirt-hold capacity (DHC) ƒ Excellent separation efficiency of the finest particles due to the three-dimensional labyrinth structure with deepth filtration ƒ Outstanding price / performance ratio Catalogue 9 § Edition 06/2024 Filtration Guideline

A www.stauff.com/9/en/#21 21 Multipass Test The Multipass Test evaluates the performance of a filter element. Standardised in ISO 16889-2008, this test allows comparable and repeatable results of the elements performance. If a normal filter element life is between a few weeks up to several months, this test reduces this life down to 90 minutes. The element is subjected to a fluid that a large amount of a special test dust ISO MTD contains. Results are given for the ß-ratio, dirt-hold capacity (DHC) and differential pressure. It is used for designing hydraulic circuits, developing new filter materials and comparison of different filter elements. See also page 18 and page 19 to get more information about the outcome data. In former time this test was also known as the Multipass Test ISO 4572. Nominal Flow Rate The nominal flow rate describes the flow rate or the volumetric flow rate for which the respective filter has been designed. It is usually given in litres per minute (l/min) or US Gallons per minute (US GPM) and is an important parameter in the filter design. Nominal Pressure Pressure for which the filter is designed and which it can be identified with. Operating Pressure / System Pressure Maximum pressure with which the filter may be used. Surface Filter Impurities are separated on the surface of the filter element. Surface filters are designed to have uniform pores (gaps), therefore they can almost completely retain specific particle sizes. Surface filters are made of Metal Wire Mesh or Cellulose materials. Other surface filters are metal-edge filters. Valve Bypass Valve A bypass valve is a valve that is integrated in a filter or filter element and allows the oil to bypass the contaminated filter element if a defined pressure differential is exceeded. Bypass valves are used to protect the filter element. Non-Return Valve It prevents the continuation line from draining while the filter element is changed. Reverse Flow Valve It is used to bypass the filter element for reversible oil flow so that the fluid does not pass through the filter element in the reverse direction. Multi-Function Valve A combination of bypass, reverse flow and non-return valve. Viscosity The viscosity of a fluid describes the flow behavior of a liquid. There are the kinematic viscosityυwith the unit “m²/s” and the dynamic viscosityhwith the unit “Ns/m²”. In the field of filtration, in the design of filters the kinematic viscosity is required for calculating. The kinematic viscosityυ can also be calculated with the dynamic viscosityhand densityρ: υ = h ρ The kinematic viscosity unit is “mm²/s”, before it was called centistokes or Stokes (1 cSt = 1 mm²/s = 10 -6m²/s). The unit of dynamic viscosity is “Ns/m², it was previously reported in Poise (10 P = 1 Ns/m² = 1 Pa s). Filter Material (Continuation) Polyester ƒ 100% Polyester Fibres with thermal bonding ƒ High pressure differential resistance ƒ Good chemical resistance ƒ High separation efficiency of the finest particles ƒ Tear-proof structure Cellulose ƒ Filter material made of Cellulose Fibres with special impregnation ƒ Variants with the lowest price with good dirt retention capacity ƒ Not suitable for water based media Stainless Fibre ƒ Sintered Stainless Fibres with three-dimensional labyrinth structure for depth filtration ƒ Low flow resistance with high dirt-hold capacity ƒ Excellent chemical and thermal resistance Stainless Mesh Filter elements with a Metal Wire Mesh are often used as a conditionally reusable solution in protection filters, Suction-Line Filters or Return-Line Filters. Depending on the requirements (micron rating, pressure, dynamics) different types of mesh are used like twill, linen, or also Dutch weave. ƒ Wire mesh fabric made of material 1.4301 or 1.4305 for surface filtration (other material on request) ƒ Low flow resistance due to large-pored screening surface ƒ Excellent chemical and thermal resistance ƒ Cleanable under special conditions Flow Rate This is the amount of fluid that flows past a specific cross-section per unit time. It is given in litres per minute (l/min) or gallons per minute (US GPM). Hydraulic Fluid A pressure liquid is defined to be a fluid used in hydraulic and lubrication systems. According to ISO 6743, the fluids are divided into mineral oil based, flame resistant and biodegredable liquids. Micron Rating Regarding micron rating, we must differentiate between the filter materials that are used. To define the micron rating for Inorganic Glass Fibre filter elements, the ß-value as per ISO 16889 is commonly used. Absolute and Nominal micron rating Micron rating is the size of particles which are filtered out by filters at a certain efficiency. When this efficiency is at least 99.5%, we speak about absolute micron rating/filtration. Nominal micron rating is just a commercial trick for all efficiencies lower than 99.5%, meaning that for the same micron rating (for ex. 5 µm) in the case of nominal rating, not all particles will be captured in the filter as in the case of absolute micron rating. Catalogue 9 § Edition 06/2024 Filtration Guideline

A 22 www.stauff.com/9/en/#22 Choice of Filters Choice of a Suitable Micron Rating Generally, the type of components incorporated in the hydraulic system will determine the micron rating required. It has been clearly demonstrated that system components will operate reliably for years if a specific minimum oil cleanliness grade is maintained. Frequently the choice will be determined by the most sensitive component in the system. a) Operating Filter To get a rough, first rating of what filter is needed to assure a certain oil cleanness grade please have a look at page 19. Apart from the specific flow rate (l/min per cm2 of filter area), other factors such as operating environment and condition of seals and breathers can have an effect on the cleanliness grade which can actually be achieved. b) Protective Filter Occasionally, protective filters are fitted downstream of major components, e.g. the pump, to collect the debris in case of a catastrophic failure. This avoids total stripping and flushing of the system. For economic reasons, protective filters are normally one grade coarser than the operating filters since they do not significantly contribute to the cleaning of the system and this extends filter service intervals. Choice of the Optimum Filter In selecting the filter, the following information must be considered: ƒ Maximum flow volume (Qmax ) through the filter including surge flows ƒ Kinematic viscosity ( υ ) of the fluid in mm2 /s (cSt) at cold start temperature and operating temperature ƒ Densityρof the fluid ƒ Micron rating (µm): see table on page 19 ƒ Filter material The aim is to choose a filter whose total differential pressure (∆p) is not higher than ∆pmax = 1,0 bar (for Pressure Filters) or ∆pmax = 0,5 bar (for Return-Line filters), in a clean state at the normal operating temperature. These values have been proven in practice to give the optimum service life for the element. The nominal flow volume of the filter is the obvious reference value for pre-selection and this should be larger than the flow to be filtered. Qnom > Qmax Calculations based on the filter data will verify whether the pre-selected filter meets the requirements, at operating temperatures: ∆pmax ≤ 1,0 bar (for Pressure Filter) ∆pmax ≤ 0,5 bar (for Return-Line Filter) The total differential pressure of the assembly ∆pAssy is calculated by adding the differential pressure of the housing ∆pHous and that of the element ∆pElem . Both the kinematic viscosity and density of the operating medium should be considered for the selection, as the flow curves on the pages following have been determined with a kinematic viscosity ofυ = 30 cSt and a density ofρ = 0,86 kg/dm3 . The values of the pressure drops for the ∆p Hous and the ∆pElemcan be read from the flow curves on the pages following. The values for the kinematic viscosity in cSt and the density in kg/dm3 should be inserted into the following formula: ∆pAssy = ρ ∙ ∆pHous + ρ ∙ υ ∙ ∆pElem 0,86 0,86 30 The filter size is suitable if the ∆pAssy < ∆pmax . If the calculated ∆pAssy is higher than ∆pmax select the next larger filter size and re-calculate until a satisfactory solution is found. The following two examples explain and help to understand the procedure of calculating a filter. Examples of Calculation Example 1: Selection Pressure Filter System Information: A Pressure Filter with an Inorganic Glass Fibre element is required immediately after the pump. The system has standard components and is operating at pressures up to 200 bar. The filter shall be fitted with a bypass valve and a visual clogging indicator. For better understanding only the calculation at the upper temperature is carried out. Data given: Qmax : 100 l/min Oil type: ISO 68 Temperature max.: +50°C Viscosityυoperating : 44 mm²/s Densityρ : 0,882 kg/dm3 Micron rating: 10 µm (see table on page 19) First Step Pre-selection of the size: SF-045, Qnominal = 160 l/min > Qmax Pressure drop values (at viscosity of 30 mm2 /s) from the flow characteristics: ∆pHous = 0,15 bar (SF-045 ..., see page 40) ∆pElem = 0,77 bar (SE-045-G -10- B/4, see page 40) Determination of the correction factor: ∆pAssy = 0,882 ∙ 0,15 bar + 0,882 ∙ 44 ∙ 0,77 bar 0,86 0,86 30 ∆pAssy = 1,31 bar ≥ ∆pmax = 1,0 bar Since the actual pressure drop is larger than the allowed pressure drop, a larger filter has to be chosen. Second Step Selection of the next larger filter size: SF-070, Qnominal = 240 l/min > Qmax ∆pHous = 0,15 bar (SF-070 ..., see page 40) ∆pElem = 0,45 bar (SE-070-G-10-B/4, see page 40) ∆pAssy = 0,882 ∙ 0,15 bar + 0,882 ∙ 44 ∙ 0,45 bar 0,86 0,86 30 ∆pAssy = 0,83 bar ≤ ∆pmax = 1,0 bar In a clean state, this filter fulfills the requirements and is suitable for the application. The correct filter designation would beSF-070-G-10-B-T-G20-B-V . Catalogue 9 § Edition 06/2024 Filtration Guideline

A www.stauff.com/9/en/#23 23 Example 2: Selection Return-Line Filter System Information: A Return-Line filter with a Cellulose element with a micron rating of 10 µm is required to clean the oil. No clogging indicator is required. Please note: If the system incorporates either accumulators or cylinders, the return flow can dramatically exceed pump flow and the maximum surge flow should be the flow used to calculate the pressure drop through the filter. Data given: Qmax : 100 l/min Oil type: ISO 68 Temperature max.: +60°C Viscosityυoperating : 29 mm²/s Densityρ : 0,882 kg/dm3 Micron rating: 10 µm (see table on page 19) First Step Pre-selection of the size: RF-030, Qnominal = 110 l/min > Qmax Pressure drop values (at viscosity of 30 mm2 /s) from the flow characteristics: ∆pHous = 0,30 bar (RF-030 ..., see page 72) ∆pElem = 0,067 bar (RE-030-N-10-B, see page 72) Determination of the correction factor (see page 22): ∆pAssy = 0,882 ∙ 0,30 bar + 0,882 ∙ 29 ∙ 0,067 bar 0,86 0,86 30 ∆pAssy = 0,37 bar ≤ ∆pmax = 0,5 bar In a clean state, this filter fulfills the requirements and is suitable for the application. No further calculation is necessary. The correct filter designation would beRF-030-N-10-B-G16 . Catalogue 9 § Edition 06/2024 Filtration Guideline

www.stauff.com/9/en/#25 B 25 Catalogue 9 § Edition 06/2024 Replacement Filter Elements Filter Elements Filter Material – Quality And Properties 26 27 27 28 For Return-Line Filters For Pressure Filters For Spin-On-Filters For Suction Strainers 28 24 - 33 Interchanging STAUFF Filter Elements Order Codes 29 Special Filter Element Solutions 30 Filter Elements For Single, Double and Automatic Filters 32 - 33 31 Checklist for the selection of filter housings

26 www.stauff.com/9/en/#26 B Replacement Filter Elements for Applications involving Hydraulic and Lubrication Oils Protecting Filter Elements Against Direct Flow Impact The sensitive filter bellows on filter elements are frequently prone to damage during transportation, storage and filter replacement work. In addition, large particles in the flow of fluid may harm the filter material. STAUFF offers a solution: SE and RE series filter elements with protective sheath (only available for glass fibre elements). This is a thin, perforated plastic sheet that completely encases the pleats of the filter from the outside as well as making the element more stable. A further positive effect is that the volume of flow is distributed more evenly by the protective sheath, thus ensuring an efficient flow rate. In its standard version, the foil is printed with the STAUFF 4PRO logo, eliminating any mix-up with other brands. Larger quantities can also be produced with a customised imprint on the sheath. The STAUFF 4PRO Glass Fibre Elements The PLUS for customers: ƒ Longer operating times through higher dirt holding capacity ƒ Improved energy efficiency through lower differential pressure ƒ Excellentbvalues and outstandingbstability ƒ The 4Pro stands for 4 pros that characterise STAUFF glass fibre materials: • proACTIVE • proFESSIONAL • proGRESSIVE • proTECTION Or simply: Fo(u)r Protection In terms of theβvalue, STAUFF elements have always exhibited excellent performance. For those who take filtration seriously, there`s no other valid approach – the measured values must hold up under any inspection. The elements cannot afford any vulnerabilities. The new generation of elements also have excellent dirt holding capacities. Values that users have been looking for. Values that make it possible for the user to extend operating times thereby providing significant reductions to purchasing costs for elements as well maintenance costs. PRO bvalue Key evaluation criteria for filter elements using glass fibre technology are the retention rate (micron rating) theβ value, theβ stability, the dirt holding capacity and the initial pressure differential. These values are determined using the multipass test established by ISO 16889. The designation for STAUFF elements typically includes a rating based on filter fineness. Filter designation βvalue > 200 according to ISO 4406 β (c) > 200 ISO 11171 β (c) > 1000 ISO 11171 03 4,0 µm (c) 4,5 µm (c) 05 5,0 µm (c) 6,0 µm (c) 10 8,8 µm (c) 11,0 µm (c) 20 21,0 µm (c) 23,0 µm (c) Filter Material – Quality And Properties The choice of the right filter material is dependent on different criteria. Among others, this includes the type of application, the filter function, degree of contamination or alternatively the required dirt-hold capacity as well as requirements of chemical or physical resistance. Inorganic Glass Fibre, Polyester, Cellulose, Stainless Fibre Material and Stainless Steel Wire Mesh are used for hydraulic applications. The following list gives you an overview of how these five filter materials differ with regard to specific properties: Inorganic Glass Fibre ƒ Inorganic Glass Fibre based on synthetic fibres with acrylic resin binding ƒ Large dirt-hold capacity ƒ Excellent separation efficiency of the finest particles due to the three-dimensional labyrinth structure with deep-bed filtration ƒ Outstanding price/performance ratio Micron rating ƒ 3 ... 25 µm (alternative micron ratings on request) Polyester Fibre ƒ 100% Polyester Fibres with thermal bonding ƒ High pressure differential resistance ƒ Good chemical resistance ƒ High separation efficiency of the finest particle ƒ Tear-proof structure Micron rating ƒ 3 ... 25 µm (alternative micron ratings on request) Stainless Fibre ƒ Sintered Stainless Fibres with three-dimensional labyrinth structure for depth filtration ƒ Low flow resistance with high dirt-hold capacity ƒ Excellent chemical and thermal resistance Micron rating ƒ 3 ... 25 µm (alternative micron ratings on request) Stainless Mesh ƒ Wire Mesh fabric made of material 1.4301 or 1.4305 for surface (other material on request) ƒ Type of weave: square weave or Dutch weave ƒ Low flow resistance due to large-pored screening surface ƒ Excellent chemical and thermal resistance Micron rating ƒ 10 ... 1000 µm (alternative micron ratings on request) Cellulose Fibre ƒ Filter material made of Cellulose Fibres with special impregnation ƒ Variants with lowest price with good dirt-hold capacity ƒ Not suitable for water based fluids Micron rating ƒ 10 ... 50 µm (alternative micron ratings on request) Catalogue 9 § Edition 06/2024 Replacement Filter Elements

www.stauff.com/9/en/#27 B 27 Replacement Filter Element for Return-Line Filters Filter media ƒ Inorganic Glass Fibre ƒ Polyester Fibre ƒ Cellulose Fibre ƒ Stainless Fibre ƒ Stainless Mesh Micron rating ƒ see on page 26 Filter Materials max. Δp*collapse ƒ 10 ... 25 bar / 145 ... 362 PSI Sealing Material ƒ NBR (Buna-N®) ƒ FKM (Viton®) ƒ EPDM Bypass ƒ 1 ... 7 bar / 0 ... 101 PSI End cap ƒ Plastic / Steel / Stainless Steel (alternative End caps on request) Replacement Filter Elements for Applications involving Hydraulic and Lubrication Oils Note: * Collapse / burst resistance as per ISO 2941. Replacement Filter Element for Pressure Filters Filter media ƒ Inorganic Glass Fibre ƒ Polyester Fibre ƒ Cellulose Fibre ƒ Stainless Fibre ƒ Stainless Mesh Micron rating ƒ see on page 26 Filter Materials max. Δp*collapse ƒ 10 ... 210 bar / 145 ... 3045 PSI Sealing Material ƒ NBR (Buna-N®) ƒ FKM (Viton®) ƒ EPDM End cap ƒ Steel / Stainless Steel / Aluminium (alternative End caps on request) w/o Bypass Valve with Bypass Valve Note: * Collapse / burst resistance as per ISO 2941. Catalogue 9 § Edition 06/2024 Replacement Filter Elements

28 www.stauff.com/9/en/#28 B Replacement Filter Elements for Applications involving Hydraulic and Lubrication Oils Replacement Filter Element for Spin-On-Filters (see on Page 168 - 173) max. Δp*collapse ƒ 5 ... 10 bar / 72 ... 145 PSI Sealing Material ƒ NBR (Buna-N®) Connection Thread ƒ BSP / UNF / NPT Note: * Collapse / burst resistance as per ISO 2941. Replacement Filter Element for Suction Strainers Filter media ƒ Stainless Mesh Micron rating ƒ 60, 125, 250 μm Flow Rate ƒ 12 - 400 l/min / 3.1 - 104 US GPM Bypass ƒ 0,2 bar / 2.9 PSI End cap ƒ Aluminium / Plastic Connection Thread ƒ BSP / NPT Note: * Collapse / burst resistance as per ISO 2941. For details, please see Catalogue No. 10 - Hydraulic Accessories. w/o Bypass Valve with Bypass Valve w/o Bypass Valve with Bypass Valve Catalogue 9 § Edition 06/2024 Replacement Filter Elements

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