This 1-inch NRV (Non-Return Valve) kit is designed to regulate airflow within the air compressor system, preventing backflow and maintaining system pressure. It meets stringent OEM quality standards, ensuring reliable operation and a longer service life than a worn valve that might stick or leak. Symptoms of a faulty NRV include the air compressor continuously running, loss of air pressure, and air leaking back through the compressor intake.
Always verify with serial number before ordering.
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Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The air compressor may run continuously without reaching cut-out pressure, or you might hear air hissing from the compressor head when the engine is off. If the NRV fails to seal, the air system will struggle to maintain pressure, impacting braking performance. Continued operation with a leaking NRV can lead to premature wear of the compressor.
Ensure the valve seat area on the compressor head is clean and free from any old gasket material or debris before installing the new valve. Avoid overtightening the valve assembly, as this can strip the threads or damage the valve components.
Inspect the air dryer and air tanks for moisture and sediment when replacing the NRV kit.