Application scenarios and functions
Core function: Consistent with the original factory check valve, it prevents the reverse flow of compressed air, lubricating oil or cooling liquid through the one-way conducting characteristic, protecting the key components of the air compressor such as the main unit, motor, and pump from reverse pressure impact.
Common application locations:
Air compressor exhaust pipeline (preventing compressed air from flowing back to the main unit during shutdown).
Lubricating oil pipeline (avoiding local oil shortage caused by reverse flow after shutdown).
Cooling system pipeline (preventing reverse accumulation of cooling liquid).
Compatible models: Mainly compatible with mainstream screw air compressors such as Atlas Copco GA series and GX series. The corresponding kit needs to be selected based on the installation size and pressure grade of the check valve of the specific model.
Kit composition and structural features
Main components: Usually include the check valve body, valve core (such as valve disc, ball-shaped valve core), spring, sealing parts (O-ring, valve seat), installation bolts and other maintenance-required accessories.
Structural form: Mostly spring-type check valves (closed by spring force, pushed open by medium pressure), some are swing-type (suitable for large flow pipelines).
Material characteristics:
The valve body is made of cast iron, brass or stainless steel (selected based on the medium and pressure), capable of withstanding system pressure (usually 0~16 bar, up to 25 bar for high-pressure models).
The valve core and spring are made of corrosion-resistant, high-strength materials (such as stainless steel), ensuring reliable operation.
Sealing parts use oil-resistant, temperature-resistant rubber (such as nitrile rubber, fluororubber), suitable for the characteristics of the air compressor medium.
Features of compatible kits
Optimized compatibility: Designed according to the installation size and interface specifications of the original factory check valve (such as thread type, flange size), ensuring direct replacement of original factory components without modifying the pipeline or installation structure.
Performance close to the original factory: By simulating the opening pressure, flow characteristics and sealing performance of the original factory check valve, it ensures compatibility with the system under normal operating conditions and meets basic functional requirements.
Economic advantage: The price is usually lower than the original factory kit, suitable for cost-sensitive maintenance needs in non-extreme working conditions.
Maintenance convenience: The kit includes all the necessary accessories for replacement, no need to purchase scattered parts separately, simplifying the maintenance process. Usage Notes
Selection matching:
Confirm the specifications of the stop valve that are compatible with the selected model (such as interface size, working pressure, and medium type), to avoid installation difficulties or functional failure due to incompatible parameters.
优先 choose compatible brands that have undergone third-party testing or market verification to reduce quality risks.
Installation guidelines：
Install the stop valve strictly according to the original factory's installation direction (flow direction indicated on the valve body)， to avoid reverse installation causing the medium to be unable to flow or losing the backflow function.
Clean the pipe interface, check the flatness of the sealing surface， ensure the correct installation of the sealing element， and prevent leakage.
Tighten the connecting bolts according to the specified torque to avoid over-tightening causing the valve body to deform.
Performance verification：
After installation， test the backflow function (such as checking for signs of reverse flow after shutdown).
Monitor the operating pressure loss. If it is significantly higher than the original factory part， it may affect system efficiency， and it is necessary to promptly investigate.
Regular inspection： The lifespan of compatible components may be slightly shorter than that of the original factory parts. It is recommended to shorten the inspection cycle (such as every 3000-5000 hours) to promptly detect problems such as valve core wear and spring fatigue.
