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Sealco · Air System
140280
In stock · ships from Knoxville
This is a pressure protection valve for air brake systems. It isolates the main air reservoirs from auxiliary devices (like air suspension or air-powered accessories) and closes at 70 PSI if a leak develops downstream, preserving enough air pressure in the primary braking system to stop the truck safely. The valve includes a built-in filter and a one-way check valve. It is commonly replaced when a vehicle has an unexplained air loss in secondary systems or when the valve fails to hold pressure.
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Universal part for any commercial vehicle air system that specifies a 70 PSI pressure protection valve with 3/8-inch NPT ports. No specific make/model restrictions found.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 16 of 17.
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Part Number: 140280
VALVE, PRESSURE PROT. .38 70PS
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside air system
