WENK Pneumatic Q/P/S Level Series Precision filter
Product Detail(Precision filter)
| Model | Particulate Filter Cartridge | Coalescing Filter Cartridge | Oil Removal Filter Cartridge | ||||||
| 015 | 025 | 035 | 015 | 025 | 035 | 015 | 025 | 035 | |
| Working Pressure | <1.0Mpa | ||||||||
| Drain Port Bore Size | G1/2(20mm) | ||||||||
| Air Flow Capacity | 1.5m³/h | 2.4m³/h | 3.5m³/h | 1.5m³/h | 2.4m³/h | 3.5m³/h | 1.5m³/h | 2.4m³/h | 3.5m³/h |
| Air Inlet/Outlet Port Size | G3/4 | G1 | G1 1/2 | G3/4 | G1 | G1 1/2 | G3/4 | G1 | G1 1/2 |
| Function | Particulate Removal | Moisture Separation | Oil Elimination | ||||||
| Material | Aluminum Alloy / Zinc Alloy | ||||||||
Product Detail(Drain Valve)
| Model | VR-20A | VR-402-04 |
| Rated Withstand Pressure | 1.6Mpa | |
| Media Temperature | 0℃~100℃ | |
| Maximum Flow Capacity | 680kg/h | |
| Material | Aluminum Alloy | |
Q/P/S Precision Filter User Manual

Technical Specifications
Q Grade Filter (Pre-Filtration)
- Filtration Precision: 5μm
- Oil Content: ≤5ppm
- Maximum Pressure: 1.6MPa
- Maximum Temperature: 65℃
- Initial Pressure Drop: 0.02MPa
- Maximum Pressure Drop: 0.07MPa
- Material: Multi-layer glass fiber filter element
P Grade Filter (Intermediate Filtration)
- Filtration Precision: 1μm
- Oil Content: ≤0.5ppm
- Maximum Pressure: 1.6MPa
- Maximum Temperature: 65℃
- Initial Pressure Drop: 0.017MPa
- Maximum Pressure Drop: 0.07MPa
- Material: Multi-layer glass fiber filter element
S Grade Filter (Post-Filtration)
- Filtration Precision: 0.01μm
- Oil Content: ≤0.01ppm
- Maximum Pressure: 1.6MPa
- Maximum Temperature: 65℃
- Initial Pressure Drop: 0.0275MPa
- Maximum Pressure Drop: 0.07MPa
- Material: Multi-layer glass fiber filter element
General Specifications
- Housing Material: Aluminum alloy
- Surface Treatment: Epoxy resin coating
- Connection Method: Threaded connection
- Drainage Method: Manual or automatic drain

Installation Steps
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Pre-installation Preparation:
- Verify that the filter model and specifications meet system requirements
- Inspect the filter for any damage or defects
- Prepare necessary installation tools and sealing materials
-
Installation Location:
- Install after the air compressor and refrigerated dryer, before pneumatic equipment
- Ensure good ventilation and easy access for operation and maintenance
- Leave sufficient space for filter element replacement
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Installation Sequence:
- Install in the order of Q grade → P grade → S grade
- Ensure correct flow direction (follow arrow indicator on housing)
- Install vertically with drain port facing downward
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Piping Connection:
- Use appropriate sealing material (e.g., PTFE tape) on threads
- Ensure secure connections without leakage
- Install pressure gauges to monitor pressure before and after the filter

Operation Guide
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Start-up Procedure:
- Slowly open the inlet valve to allow compressed air to gradually enter the filter
- Open the exhaust valve to release air from the filter
- Observe pressure gauges and open the outlet valve only after pressure stabilizes
-
Normal Operation:
- Monitor pressure differential across the filter; normal operation differential should be less than 0.05MPa
- Regularly check the drainage system to ensure proper operation
- Record operating parameters including pressure, temperature, and pressure differential
-
Shutdown Procedure:
- First close the inlet valve, then the outlet valve
- Open the exhaust and drain valves to release pressure and accumulated water
- For long-term shutdown, it is recommended to remove and properly store filter elements

Maintenance
-
Filter Element Replacement:
- Replace filter elements when pressure differential reaches 0.07MPa
- Q grade elements: recommended replacement every 3-6 months
- P and S grade elements: recommended replacement every 6-12 months
- When replacing elements, first relieve pressure, then open the filter cover, remove old elements, and install new ones
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Daily Maintenance:
- Check filter operation status daily, including pressure, temperature, and differential pressure
- Inspect drainage system weekly to ensure proper operation
- Clean the exterior of the filter monthly to remove dust and oil
-
Regular Inspection:
- Inspect the filter housing quarterly for damage or corrosion
- Check seals semi-annually for signs of aging and replace if necessary
- Perform a comprehensive inspection and maintenance annually

Precautions
-
Safety Warnings:
- Always shut off air supply and relieve pressure before installation and maintenance
- Do not exceed maximum operating pressure and temperature
- Wear appropriate protective equipment when replacing filter elements
-
Usage Limitations:
- For compressed air filtration only; not suitable for other gases
- Do not filter compressed air containing corrosive or flammable gases
- Do not use in environments with severe vibration or impact
-
Troubleshooting:
- If pressure differential suddenly increases, filter element may be clogged and should be replaced
- If leakage occurs, check connections for tightness and inspect seals for damage
- If filtration efficiency decreases, check for damaged elements or improper installation

Frequently Asked Questions
Q: What causes increased pressure differential across the filter? A: The primary cause is filter element clogging, requiring timely replacement. Additionally, it may be caused by excessive flow rate or high inlet pressure.
Q: How to determine if filter elements need replacement? A: Replace elements when the pressure differential reaches 0.07MPa, or according to service time (Q grade: 3-6 months, P and S grades: 6-12 months).
Q: Why is there no water discharge from the drain port? A: The drain valve may be clogged or damaged. Inspect and clean the drain valve, replacing if necessary.
Q: Why is there still oil mist in the filtered air? A: The filter element may be damaged or improperly installed. Inspect the element condition, replace if necessary, and ensure proper installation.













