Core functions and working scenarios
Pressure relief protection: When the air compressor stops, depressurizes, or experiences overpressure, the component automatically activates and quickly releases the residual pressure in the main unit, oil separator, or pipeline (usually reduced to below 1-2 bar), avoiding the risk of personnel coming into contact with high-pressure components during maintenance.
Auxiliary unloading: During the unloading process, it works in conjunction with the intake valve, reducing the load on the main unit, lowering energy consumption, and extending the lifespan of the motor.
Applicable scenarios: Suitable for small and medium-sized screw air compressors (power ranging from 15 to 160 kW), commonly found in pipeline systems at the air storage tank inlet, oil separator outlet, or the exhaust end of the main unit.
Component composition and structural characteristics
Main components: Typically include pressure relief valve body, valve core (piston type or diaphragm type), reset spring, seals (O-ring, valve seat), control interface (such as electromagnetic valve interface), and installation accessories (bolts, gaskets). Working principle:
During normal operation, the spring force causes the valve core to close, maintaining the system pressure.
When a control signal (such as a shutdown command or pressure sensor signal) is received, the electromagnetic valve or mechanical mechanism acts, causing the valve core to open and releasing the pressure.
After the pressure release is completed, the valve core is reset and closed under the action of the spring.
Material characteristics:
The valve body is made of cast iron or aluminum alloy (lightweight design), capable of withstanding system pressure (typically ≤ 16 bar) and temperature (≤ 120℃).
The valve core and spring are made of stainless steel, resistant to corrosion and ensuring reliable operation.
The sealing element is made of oil-resistant rubber (such as nitrile rubber), suitable for compressor oil and high-temperature environments.
Compatibility features of compatible components:
Multi-brand compatibility: Designed based on the standard pressure relief valve installation dimensions of mainstream screw compressors (such as interface threads G1/2" and G3/4"), control methods (pneumatic or electric), and can be directly replaced with original factory components without modifying the piping.
Parameter matching: The opening pressure (typically 0.5 - 2 bar adjustable) and pressure relief flow rate are close to those of the original factory valve, ensuring the pressure relief speed and system compatibility, avoiding slow pressure relief that causes shutdown delays or rapid pressure relief that triggers pipeline vibration.
Economy and practicality: The price is lower than that of original factory components, and some brands offer universal models, reducing spare parts inventory costs, suitable for daily maintenance of small repair enterprises or equipment users.
Selection and installation precautions:
Parameter confirmation:
Match the working pressure of the air compressor (such as 10 bar, 13 bar models), interface specifications (thread type and size), and control method (such as 24V electromagnetic valve control or pneumatic control).
Confirm the diameter of the pressure relief pipeline to ensure the component flow meets the system pressure relief requirements (avoiding long pressure relief time due to insufficient flow).
Installation specifications:
Install according to the arrow indication on the valve body, ensuring the correct direction of pressure release.
Clean the pipe interface, inspect the sealing surface, and replace the new sealing element (to avoid leakage caused by old gaskets).
Control circuit (such as electromagnetic valve wiring) needs to be correctly connected to ensure the signal triggers the pressure relief action normally.
Debugging and testing:
After installation, manually trigger the pressure relief function to check if the opening is smooth, the seal is reliable (no continuous leakage).
Test the pressure relief time (typically 3 - 10 seconds, adjusted according to the system volume), ensuring it meets the safety requirements of the equipment.
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