Vertical Air Compressor Discharge Check Valve, 1/2 in and 3/4 in NPT
Vertical pattern discharge check valves for air compressors. Same job as any compressor check valve, air into the tank and nothing back out, but configured for a discharge line that drops straight down into the receiver rather than running across to it.
Sizes
- S1025: 1/2 in NPT
- S1052: 3/4 in NPT
Vertical or horizontal
This is set by how the discharge is plumbed on your machine, not by preference. Fitting a horizontal pattern valve into a vertical run, or the other way round, can leave the valve orientated so it does not seat reliably under its own weight. Look at the line coming off the pump: if it drops straight into the tank port, you want the vertical valve.
Symptoms of a failed check valve
Air bleeding back out of the unloader long after the compressor has stopped is the classic one. The tank empties back through the pump overnight, the machine short cycles, and every restart happens against pressure. On a single phase motor that is also how you end up chasing a start capacitor or an overload that was never actually the problem.
Fitting it
Blow the tank down first, let the pump cool, and note the flow direction on the body before you start. Use thread sealant rather than tape. Debris on a check valve seat is the most common reason a brand new valve leaks straight out of the box, and tape shreds are the most common debris.
Related parts
We also stock horizontal inline check valves from 1/4 in to 2 in NPT, in tank check valves including the pattern that fits Kellogg pumps, cold start auxiliary unloaders, CDI pilot valves, tank manifolds and safety relief valves.
Questions
Tell us the compressor make and model and how the discharge is run, and the Warthog Air Compressor Store team will confirm the right valve before you order.
Vertical discharge check valves for air compressors in 1/2 in and 3/4 in NPT, for discharge lines that drop straight into the tank.
NOTE: Actual product may be different from pictured!
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