R e t u r n - S u c t i o n F i l t e rs

Product catalog summary

Introduction
This document provides technical specifications and operational guidelines for ARGO-HYTOS return-suction filters used in hydraulic systems with hydrostatic drives. These filters ensure cleanliness and protect against wear by filtering both suction and return flows.

Specifications

Filter Elements: Designed for full-flow filtration to meet high cleanliness standards.
Suction Filter Function: Ensures 100% filtration of suction flow, preventing dirt from entering the boost pump.
Return Filter Function: Protects pumps from dirt particles remaining after assembly or repairs.
Materials: Polyester, aluminum alloy, steel, and NBR seals.
Operating Pressure: Maximum 10 bar.
Temperature Range: -30°C to +100°C (temporary -40°C to +120°C).

Functional Characteristics
The hydraulic oil passes through the filter element, is pressurized by a 0.5 bar check valve, and supplied to the boost pump. Surplus oil flows into the reservoir, minimizing cavitation risk and ensuring full performance during cold starts. An integral pressure relief valve prevents excessive back pressure.

Design Recommendations
Suggested circuit layouts emphasize maintaining a precharging pressure of approximately 0.5 bar. The document specifies required return flow rates and permitted feed pump flow rates under various conditions.

Procedures
Start-up and deaeration procedures are outlined for units with emergency-suction valves, using the start-up set E 084.1710. For other types, manufacturers' deaeration instructions must be followed. Filter maintenance is facilitated by clogging indicators that signal the optimal time for maintenance.

Performance Features
The filters provide protection against wear through full-flow filtration, ensuring no dirt enters the boost pump. The return filter function protects pumps from dirt particles remaining in the system after assembly or repairs.

Operational Guidelines

Return Flow: Must exceed suction flow to maintain precharging pressure.
Flow Velocity: Return lines ≤ 4.5 m/s, suction lines ≤ 1.5 m/s.
Pressure Loss: Must not exceed 0.4 bar in suction lines during cold start.

Filter Fineness and Dirt-Holding Capacity
Available in grades 12 E-X and 16 E-X, achieving oil cleanliness according to ISO 4406. The 12 E-X grade is recommended for components requiring higher oil purity.

Suggested Circuit Layouts
Two circuit layouts are suggested: one where leakage oil is routed across the filter, and another where it is discharged directly into the tank. The choice depends on the return flow relative to the suction flow.

Technical Data
Operating pressure is capped at 10 bar, with materials including polyamide, aluminum alloy, and NBR seals. The filters accommodate mineral oil and biodegradable fluids, with a temperature range of -30°C to +100°C.

Diagrams and Charts
Several diagrams illustrate pressure drop as a function of flow volume and kinematic viscosity. The selection chart provides details on dirt-holding capacity, pressure drop, nominal return flow, and filter fineness.

Quality Assurance
Quality management adheres to DIN EN ISO 9001 standards, with filters undergoing strict controls and tests according to DIN and ISO standards to ensure reliability and performance. It stresses the importance of using original ARGO-HYTOS spare parts to ensure the functionality and reliability of the filters.

Conclusion
ARGO-HYTOS return-suction filters provide reliable performance under extreme conditions by ensuring high cleanliness levels and protecting hydraulic systems from wear.

Catalog excerpts

R e t u r n - S u c t i o n F i l t e rs-1

E 084 • Tank top mounting • Connection up to G1 • Nominal flow rate up to 80 l/min

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R e t u r n - S u c t i o n F i l t e rs-2

Description Application For operation in units with hydrostatic drives, when the return ﬂow is under all operating conditions higher than the oil ﬂow of the boost pump. Performance features Protection against wear: By means of ﬁlter elements that, in full-ﬂow ﬁltration, meet even the highest demands regarding cleanliness classes. Suction ﬁlter function: Because of the 100%-ﬁltration of the suction ﬂow, no dirt can get into the boost pump. Return ﬁlter function: By means of full-ﬂow ﬁltration in the system return, the pumps above all are protected from dirt particles remaining in the system after...

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R e t u r n - S u c t i o n F i l t e rs-3

Layout General In machines with a hydrostatic drive and combined working hydraulic system, suction-return ﬁlters replace the suction or pressure ﬁlters previously required for the feed pump of the closed-loop hydrostatic drive circuit as well as the return ﬁlter for the open-loop working hydraulic circuit. While each circuit operates independently with separate ﬁlters, the combination of the two circuits via the suction-return ﬁlter causes interaction between the circuits. If the design criteria described below are taken into account, you can take full advantage of the beneﬁts provided by the...

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R e t u r n - S u c t i o n F i l t e rs-4

Characteristics Nominal ﬂow rate Up to 80 l/min in return line (see Selection Chart, column 2) Up to 40 l/min Feed pump ﬂow rate (see Layout) The nominal ﬂow rates indicated by ARGO-HYTOS are based on the following features: • closed by-pass valve at ν ≤ 200 mm2/s • element service life > 1000 operating hours at an average ﬂuid contamination of 0,07 g per l/min ﬂow volume • ﬂow velocity in the return lines ≤ 4,5 m/s • ﬂow velocity in the suction lines ≤ 1,5 m/s Viscosity at nominal ﬂow rate • at operating temperature: ν < 60 mm2/s • as starting viscosity: νmax = 1000 mm2/s • at ﬁrst operation:...

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R e t u r n - S u c t i o n F i l t e rs-5

Pressure drop as a function of the kinematic viscosity at nominal ﬂow Pressure drop as a function of the ﬂow volume at ν = 35 mm2/s (00/01 = casing empty without/with hole Ø 4 mm) ∆p-curves for complete ﬁlters in Selection Chart, column 3 Filter ﬁneness curves in Selection Chart, column 4 Filtration ratio β as a function of particle size x obtained by the Multi-Pass-Test according to ISO 16889 Filtration ratio β for particles > x µm The abbreviations represent the following β-values resp. ﬁnenesses: For EXAPOR®MAX- and Paper elements: 5 E-X = β5 (c) = 200 EXAPOR®MAX 8 E-X = β8 (c) = 200 EXAPOR®MAX...

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R e t u r n - S u c t i o n F i l t e rs-6

Selection Chart 2 1 nt DX V gr. me PR CV o. e Dia ele of ity of w r e e ac ﬂo see rve n se lte ap sur essur rn s u p tﬁ r gc res n A ion B etu dro D/c enes en lr g p ing p ol e ldin n ctio ect em no. t ina k ho kin sur ram r ﬁ ne n b lac igh on on om Pres Diag Filte irtrac Crac Sym ep Part C C D N R C We All ﬁlters are delivered with a plugged clogging indicator connection M 12 x 1,5 (at P). As clogging indicators either manometers or electrical pressure switches can be used. For the appropriate clogging indicators see catalogue sheet 60.20. Remarks: • The start of the red area respectively the...

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R e t u r n - S u c t i o n F i l t e rs-7

Versions with emergency-suction valve and protection strainer Connection M12 x 1,5 for clogging indicator Port sizes and mounting face Measurements Type * Oil outlet resp. emergency suction has to be under all operating cond. below min. oil level (given by Y)

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R e t u r n - S u c t i o n F i l t e rs-8

The functions of the complete filters as well as the outstanding features of the filter elements assured by ARGO-HYTOS can only be guaranteed if original ARGO-HYTOS spare parts are used. Quality management according to DIN EN ISO 9001 To ensure constant quality in production and operation, ARGO-HYTOS filter elements undergo strict controls and tests according to the following DIN and ISO standards: Verification of collapse/burst resistance Verification of material compatibility with fluids Verification of flow fatigue characteristics ISO 2942 Verification of fabrication integrity (Bubble Point...

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R e t u r n - S u c t i o n F i l t e rs-9

Return-Suction Filters E158 • E198 • E248 • Tank top mounting • Connection up to G1V4 • Nominal flow rate up to 250 l/min

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R e t u r n - S u c t i o n F i l t e rs-10

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R e t u r n - S u c t i o n F i l t e rs-11

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R e t u r n - S u c t i o n F i l t e rs-12

Characteristics Nominal ﬂow rate Up to 250 l/min in return line (see Selection Chart, column 2) Up to 125 l/min Feed pump ﬂow rate (see Layout) The nominal ﬂow rates indicated by ARGO-HYTOS are based on the following features: • closed by-pass valve at ν ≤ 200 mm2/s • element service life > 1000 operating hours at an average ﬂuid contamination of 0,07 g per l/min ﬂow volume • ﬂow velocity in the return lines ≤ 4,5 m/s • ﬂow velocity in the suction lines ≤ 1,5 m/s Viscosity at nominal ﬂow rate • at operating temperature: ν < 60 mm2/s • as starting viscosity: νmax = 1000 mm2/s • at ﬁrst operation:...

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