Suction Strainer for Hydraulic Reservoirs

Product Specifications

Technical details and manufacturing context for Suction Strainer

Definition

The suction strainer is a critical component of a hydraulic reservoir, positioned at the pump's suction inlet. Its primary function is to filter out solid contaminants (such as metal particles, dirt, and debris) from the hydraulic fluid before it enters the pump, thereby protecting the pump and other sensitive hydraulic components from damage, wear, and failure. It typically consists of a fine mesh or perforated screen housed within a protective casing.

This directory entry provides reference data for selection and verification. The nominal diameter ranges from DN15 to DN100 (ISO 1127), matching pump inlet pipe sizes. Flow rates span 25 to 400 L/min (ISO 3968), with pressure drop increasing with flow. Filtration ratings are 25 to 125 µm (ISO 16889), where finer ratings increase pressure drop. Operating pressure is 1.0 to 1.6 MPa, with a burst pressure of 2.5 MPa (safety factor 1.5 over maximum operating). Operating temperature ranges from -20 to 80 °C (ISO 3448), limited by seal material. Connection types include flange or threaded per SAE J518. Mesh size ranges from 120 to 500 (ISO 9044), corresponding to filtration rating. Materials on file include stainless steel mesh (grades 304/316L per ASTM A240) and steel housing. Weight ranges from 1.5 to 8.0 kg depending on size and material. Sealing materials are NBR or FKM (ISO 3601), with FKM for high temperature.

These values are typical reference ranges; actual model-specific parameters must be confirmed with the legal manufacturer or supplier. Standards listed are procurement references, not proof of certification or compliance. Always verify that the selected strainer meets the specific requirements of your hydraulic system, including compatibility with fluid, pressure, temperature, and installation dimensions.

Working Principle

Hydraulic fluid is drawn from the reservoir into the pump through the suction line. The suction strainer, positioned in this flow path, acts as a physical barrier. Contaminants larger than the mesh or screen openings are trapped on the outer surface of the strainer element, allowing only clean fluid to pass through to the pump. Some designs include a bypass valve that opens if the strainer becomes excessively clogged, preventing pump cavitation at the cost of allowing unfiltered fluid to pass temporarily.

Common Materials

Stainless Steel Mesh, Steel Housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	DN15–DN100 mm	Matches pump inlet pipe sizeISO 1127
Flow Rate	25–400 L/min	Pressure drop increases with flowISO 3968
Filtration Rating	25–125 µm	Finer rating increases pressure dropISO 16889
Burst Pressure	2.5 MPa	Safety factor 1.5 over max operating
Operating Temperature	-20–80 °C	Seal material limits rangeISO 3448
Connection Type	SAE J518 code	Flange or threadedSAE J518
Mesh Size	120–500 mesh	Corresponds to filtration ratingISO 9044
Material	304/316L grade	316L for corrosive fluidsASTM A240
Weight	1.5–8.0 kg	Depends on size and material
Sealing Material	NBR/FKM grade	FKM for high temperatureISO 3601

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Strainer Element / Screen Part
The perforated or mesh component that physically filters the fluid.

Material: Stainless Steel
Housing / Body Part
The outer casing that contains the strainer element and provides connection ports.

Material: Steel or Cast Iron
Gasket / Seal Part
Ensures a leak-proof connection between the strainer and the reservoir or suction line.

Material: Buna-N, Viton, or other elastomers
Bypass Valve Optional
Opens when the screen clogs so the pump does not cavitate, at the cost of letting unfiltered oil through.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Hydraulic Reservoir

View system integration details

Manufacturers of Suction Strainer

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Frequently Asked Questions

What is the primary function of a suction strainer?

It filters solid contaminants from hydraulic fluid before the fluid enters the pump, protecting the pump and downstream components from damage and wear.

What are typical filtration ratings for suction strainers?

Typical filtration ratings range from 25 to 125 µm, per ISO 16889. Finer ratings increase pressure drop, so selection must balance filtration efficiency with system performance.

How does a bypass valve work in a suction strainer?

If the strainer becomes clogged, the bypass valve opens to allow fluid to flow directly to the pump, preventing cavitation. This temporarily allows unfiltered fluid to pass, so the strainer should be cleaned or replaced promptly.

What standards apply to suction strainer parameters?

Standards include ISO 1127 for nominal diameter, ISO 3968 for flow rate, ISO 16889 for filtration rating, ISO 3448 for temperature, SAE J518 for connections, ISO 9044 for mesh size, ASTM A240 for material, and ISO 3601 for seals. These are reference standards; verify compliance with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar (150 psi)
flow rate:	Dependent on mesh size and housing diameter
temperature:	-20°C to +80°C
slurry concentration:	Not applicable - designed for clean hydraulic fluids with minimal solids

Suction Strainer

Product Specifications

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