Wholesale Atlas Copco Screw Air Compressor Spare Part Intake Unloader Unloading Valve
Premium Atlas Copco Intake Unloader Valve 1625471085 for GA series screw air compressors. Built from aluminum and stainless steel with Viton seals, ensuring fast response, high durability, and efficient airflow control for stable compressor operation.
| Application |
Air Compressor |
|---|---|
| Material |
Aluminum ,Stainless Steel |
The Atlas Copco Intake Unloader Valve (1625471085) is an essential component designed to manage air intake and system loading cycles in oil-injected screw air compressors. It serves as the “airflow gatekeeper,” regulating the compressor’s transition between load and unload states with precision. By controlling how and when atmospheric air enters the compression chamber, this valve directly influences compressor efficiency, energy consumption, and service life of critical components such as the airend and motor.
This model (1625471085) is widely used in Atlas Copco GA series screw compressors and engineered to deliver stable, responsive, and maintenance-friendly operation even in demanding industrial environments.
Design and Material Construction
The valve body is precision-cast from anodized aluminum, ensuring corrosion resistance, dimensional stability, and high tensile strength under thermal expansion. Internally, a stainless-steel piston and spring assembly provide smooth movement with minimal friction, while fluoroelastomer (Viton) seals maintain airtight integrity under high temperature and oil-rich conditions.
A key design upgrade of this model lies in its integrated pilot control chamber, which enhances response sensitivity and reduces lag time between signal input and valve actuation. The valve seat adopts a conical sealing surface machined to micron-level accuracy, providing reliable shutoff even under varying inlet pressures. This ensures consistent compressor performance and prevents air leakage during idle periods.
Functional Characteristics
Unlike simple on/off intake valves, the 1625471085 unloader valve provides proportional control across the compressor’s operational cycle:
- Start-up Phase: The valve remains closed to isolate the compression chamber, reducing the start load on the motor.
- Loading Phase: When the system pressure drops below the preset threshold, the valve opens gradually, allowing controlled air intake to achieve smooth pressure buildup.
- Unloading Phase: At maximum pressure, the valve returns to the closed position or partially throttles intake air, maintaining system pressure without unnecessary energy draw.
- Idle Protection: Built-in relief channels discharge residual air to prevent oil backflow and avoid airend strain.
This intelligent sequence ensures that the compressor runs only when required, minimizing energy waste and mechanical wear.
Performance Benefits
- Fast and Accurate Pressure Response – Reduces delay between load and unload transitions, improving air supply stability.
- Extended Compressor Lifespan – Prevents pressure surges and protects the airend bearings and motor shaft.
- Improved Energy Efficiency – Automatically reduces air intake during idle periods, lowering electricity costs.
- Low Maintenance Requirement – Modular construction allows easy disassembly and cleaning without special tools.
- Leak-Free Operation – Precision-engineered sealing elements ensure long-term reliability under continuous cycling.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | 1625471085 |
| Function | Intake Unloader Valve |
| Type | Pneumatic Airflow Control |
| Material | Aluminum Alloy, Stainless Steel, Viton |
| Pressure Range | 0–16 bar |
| Temperature Range | –10°C to +120°C |
| Response Time | <0.25 seconds |
| Control Type | Pneumatic (Pilot-operated) |
| Compatibility | Atlas Copco GA Series Screw Compressors |
Quality Assurance and Testing
Each valve undergoes dimensional accuracy inspection, pneumatic pressure testing, and dynamic cycling evaluation before delivery. Test conditions simulate actual compressor operation, including rapid load/unload transitions, to ensure consistent performance. The assembly line follows ISO 9001:2015 quality standards, with 100% leak detection and final function verification prior to shipment.
Additionally, all critical sealing components are sourced from certified suppliers, ensuring compatibility with compressor lubricants and temperature fluctuations common in continuous-duty operations.
Installation and Maintenance Guidelines
Before installation, ensure that the compressor is depressurized and power is disconnected. Clean the intake manifold and confirm that the sealing surfaces are free of oil or dust. During assembly:
- Align the valve according to the airflow direction marking.
- Tighten bolts in cross-pattern sequence to avoid deformation.
- After installation, perform a short pressure test to verify opening and closing response.
Regular inspection every 6,000–8,000 working hours is recommended. Replace internal seals or springs if leakage, delayed actuation, or irregular airflow occurs. Always use OEM-standard spare parts to maintain performance integrity.
Applications and Compatibility
The 1625471085 Intake Unloader Valve is designed for Atlas Copco GA and GX series oil-injected screw air compressors, ensuring perfect fitment and performance equivalence to OEM specifications. Its robust design also makes it suitable for retrofitting in compatible compressor systems requiring reliable intake control under variable load conditions.
| Part Numbers | |||||||
|---|---|---|---|---|---|---|---|
| 1613681801 | 1613900884 | 2911000000 | 1617238400 | 2901046100 | 2910300200 | 1622963900 | 1623079485 |
| 1622171383 | 2901145300 | 2901000500 | 2901021200 | 1613679300 | 2906020100 | 2901141100 | 2901084001 |
| 1622316200 | 1625005540 | 2901000600 | 2901108401 | 1622171300 | 2901139900 | 2901099700 | 2205490598 |
| 1622316285 | 2906009500 | 3015500606 | 2200900943 | 1613900800 | 1614647680 | 1617238400 | 2906063320 |
| 1613814400 | 2901099700 | 1622963900 | 2906038000 | 1614900883 | 1513040081 | 2901021200 | 2901021701 |
| 1614900801 | 3001500626 | 2901084001 | 2901145300 | 1613815000 | 2906095900 | 2901108401 | 2901021200 |
We also offer intake unloading valves with the above part numbers. Please feel free to contact us if needed.
Why Choose Our Unloader Valves
We specialize in manufacturing and supplying precision-engineered compressor valves with strict adherence to OEM design standards. Each product is subjected to rigorous quality control and endurance validation to guarantee consistent sealing, accurate response, and extended operational life. Whether for preventive maintenance or full compressor overhauls, our unloader valves provide dependable performance and easy installation for both industrial users and service professionals.
MAECENAS IACULIS
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