W0211B2W03 filter element

1. Product Introduction

The W0211B2W03 filter element is precision-engineered for installation in hydraulic system oil circuits, designed to

 remove metal wear debris generated by hydraulic system components, along with other mechanical impurities that 

compromise fluid cleanliness. By effectively maintaining oil circuit cleanliness, this filter element significantly extends

 the service life of hydraulic systems—reducing unplanned downtime, minimizing component wear, and lowering overall 

maintenance costs.

A key feature of the low-pressure series filter element is the integrated bypass valve. When the hydraulic oil filter element 

is not replaced in a timely manner and the differential pressure rises to the preset threshold, the bypass valve automatically 

opens to ensure continuous system operation. This safety mechanism prevents oil starvation, cavitation, and potential 

equipment damage—even under temporary maintenance delays.

Available in multiple media types and precision grades, the W0211B2W03 series accommodates a broad spectrum of

 hydraulic applications, from general-purpose industrial systems to specialized phosphate ester and water-glycol circuits.

2. Technical Specifications

Parameter Specification

Model W0211B2W03

Filter media options Glass fiber filter paper (BN), Stainless steel woven mesh (W), Wood pulp filter paper (P), 

Stainless steel sintered mesh (V)

Filtration precision 1 μm – 100 μm (multiple grades available)

Maximum working pressure 21 MPa (210 bar / 3,000 psi)

Working medium General hydraulic oil, phosphate ester hydraulic fluid, emulsions, water-glycol fluids

Operating temperature –30°C to +110°C

Sealing material FKM (fluorocarbon/Viton) or NBR (nitrile rubber)

Bypass valve Integrated (factory-set opening pressure)

Flow direction Outside-in (standard)

Structural strength Compliant with ISO 2941 burst resistance standards

3. Key Performance Characteristics

3.1 Effective Removal of Metal Wear Debris

Hydraulic systems continuously generate metal particles from pump gears, valve spools, cylinder piston rods, 

and other moving components. The W0211B2W03 efficiently captures:

· Ferrous and non-ferrous metal particles – preventing abrasive wear on precision surfaces

· Mechanical impurities – rust, scale, sealing material fragments

· Oxidation byproducts – sludge, varnish, and other degradation products

3.2 Integrated Bypass Valve for System Safety

The built-in bypass valve provides critical protection when the element becomes clogged:

· Opens automatically when differential pressure exceeds the preset threshold

· Ensures continuous oil flow to prevent pump cavitation and system starvation

· Protects equipment even when scheduled maintenance is temporarily delayed

· Extends system reliability under unexpected contamination events

Important: The bypass valve is a safety feature for short-term protection only. Extended bypass operation allows unfiltered 

oil to circulate, potentially damaging components. Always replace the element promptly when the bypass valve activates.

3.3 Multi-Media Versatility

Four distinct media types accommodate diverse application requirements:

Media Type Code Characteristics Best Suited For

Glass fiber BN High efficiency, depth-loading, excellent particle retention Precision hydraulics, servo/proportional valves

Stainless steel mesh W Reusable, washable, high strength Coarse filtration, suction strainers, high-flow applications

Wood pulp paper P Economical, good efficiency, disposable General-purpose hydraulics, lower-cost applications

Sintered stainless mesh V Superior strength, high-temperature, corrosion-resistant Harsh environments, high-pressure

 systems

3.4 Broad Filtration Precision Range

Available from 1μm to 100μm, the W0211B2W03 series offers:

· 1–5μm: Ultra-fine filtration for servo systems and precision instrumentation

· 6–15μm: Standard industrial hydraulics, directional control valves

· 20–40μm: Return-line and low-pressure circuit filtration

· 50–100μm: Pump inlet protection and coarse straining

3.5 Wide Fluid Compatibility

Compatible with multiple hydraulic fluid types, eliminating the need for multiple filter inventories:

· General mineral hydraulic oil

· Phosphate ester hydraulic fluids (fire-resistant)

· Oil-water emulsions

· Water-glycol fluids

3.6 Extended Temperature Range

Reliable operation from –30°C to +110°C accommodates:

· Cold-start conditions in winter climates

· High-temperature continuous operation in furnace-side hydraulics

· Fluctuating temperatures in outdoor and mobile applications

4. Application Fields

4.1 Metallurgical Industry

· Hydraulic system filtration for rolling mills, continuous casting machines, and plate levelers

· Lubrication circuit purification for steel and aluminum production equipment

· Protection of servo valves and proportional valves in hot rolling environments

4.2 Petrochemical Industry

· Separation and recovery of products and intermediates in refining and chemical production

· Liquid purification in manufacturing processes (optics, magnetic media, photographic film)

· Oilfield injection water and natural gas particle removal

4.3 Textile Industry

· Polyester melt purification and uniform filtration during fiber drawing processes

· Air compressor intake protection and compressed air cleaning

· Compressed gas oil-water removal and dehydration

4.4 Electronics & Pharmaceutical Industries

· Reverse osmosis (RO) water pre-treatment and final filtration

· Deionized water system protection

· Washing solution and glucose solution pre-treatment filtration

· Cleanroom utility systems requiring high-purity fluids

4.5 General Industrial Hydraulics

· Machine tool hydraulic systems (grinders, milling machines, presses)

· Injection molding machine hydraulic protection

· Test stands and hydraulic power units

· Lubrication systems for compressors, turbines, and gearboxes

5. Maintenance & Operation Guidelines

1. Differential Pressure Monitoring – Install a differential pressure gauge or visual indicator on the filter housing. 

Monitor pressure drop regularly to determine element condition.

2. Bypass Valve Indication – When the bypass valve opens, replace the element immediately. Continued operation in 

bypass mode allows unfiltered oil to circulate, accelerating component wear.

3. Element Selection – Confirm media type, precision grade, and seal material match your system's fluid and operating 

conditions.

4. Proper Installation – Ensure seals are properly seated. Tighten to recommended torque to prevent bypass leakage through

 the seal interface.

5. Storage – Store spare elements in dry, dust-free conditions in original packaging. Maintain FIFO (first-in, first-out) inventory

 management.

6. Replacement Protocol – Always replace seals when changing elements. Dispose of spent elements according to local 

environmental regulations.

6. FAQ (Frequently Asked Questions)

Q1: What is the function of the integrated bypass valve in the W0211B2W03 filter element?

A: The bypass valve automatically opens when the differential pressure across the element exceeds the preset 

threshold—typically when the element becomes clogged. This ensures continuous oil flow to prevent pump cavitation 

and system starvation, even when filter replacement is temporarily delayed.

Q2: Can the bypass valve be adjusted or removed?

A: The bypass valve is factory-preset to a specific opening pressure and is not designed for field adjustment. 

Removing or modifying the bypass valve is not recommended, as it compromises system safety. Please consult our technical 

team if you require a different bypass pressure setting.

Q3: What filtration precision options are available for this series?

A: Available precision grades range from 1μm to 100μm. Standard options include 1μm, 3μm, 5μm, 10μm, 20μm, 50μm, 

and 100μm. Custom precision grades are available upon request.

Q4: What media types can be selected for the W0211B2W03?

A: Four media types are available: BN (glass fiber filter paper), W (stainless steel woven mesh), P (wood pulp filter paper), 

and V (stainless steel sintered mesh). Selection depends on your precision requirements, fluid type, and operating conditions.

Q5: Is the W0211B2W03 compatible with phosphate ester hydraulic fluids?

A: Yes. The standard media is compatible with phosphate ester fluids. For this fluid type, we recommend FKM

 (fluorocarbon/Viton) seals. Please specify your fluid type when ordering to ensure correct seal selection.

Q6: What is the maximum working pressure for this filter element?

A: The maximum working pressure is 21 MPa (210 bar / 3,000 psi). Always verify that your system pressure does not exceed

 this rating.

Q7: How do I know when to replace the W0211B2W03 filter element?

A: Replace when: (1) The differential pressure reaches the manufacturer's recommended change-out value; (2)

 The bypass valve opens (indicating severe clogging); (3) The pressure gauge shows excessive restriction; (4) Scheduled

 maintenance intervals are reached based on operating hours.

Q8: Can the stainless steel mesh version be cleaned and reused?

A: Yes. The stainless steel woven mesh (W) and sintered mesh (V) versions are washable and reusable. Use appropriate solvent 

and reverse-flow compressed air for cleaning. BN and P versions are disposable and must be replaced with new elements.

Q9: What is the operating temperature range for these filter elements?

A: Standard elements operate from –30°C to +110°C. For applications requiring temperatures outside this range, 

specialty media and seal materials are available. Please specify your temperature requirements when ordering.

Q10: Is the W0211B2W03 fully interchangeable with original filter elements?

A: Yes. All dimensional parameters, thread interfaces, sealing groove positions, and bypass valve settings are fully compatible 

with corresponding original filter housings. Direct drop-in replacement requires no mechanical modification.

Q11: What is the recommended storage condition for spare filter elements?

A: Store in original packaging in a cool (10–30°C), dry (<60% RH), dust-free environment. Avoid direct sunlight, 

chemical exposure, and extreme temperatures. Properly stored elements maintain performance integrity for up to 5 years.

Q12: What documentation is provided with each filter element?

A: Each element is supplied with a certificate of conformance, dimensional inspection report, and batch traceability. 

ISO 16889 multi-pass test reports and material certificates are available upon request.

Q13: How does the W0211B2W03 compare to other filter elements in the same category?

A: The W0211B2W03 offers a unique combination of integrated bypass valve safety, multiple media options, and wide precision

 range. This flexibility makes it suitable for a broader spectrum of applications compared to single-media or single-precision

 elements.

Q14: Do you offer custom configurations for non-standard applications?

A: Yes. We offer custom media, precision, dimension, and seal configurations for non-standard applications. Please provide 

your housing specifications and application requirements for a customized solution.

Product characteristics