3/4 Inch Compression To 1/2 Inch NPT Pilot Unloader Check Valve For Air Compressors, Factory Set 140 PSI Cut In 175 PSI Cut Out, Tank Outlet 1/2 Inch NPT, Inlet 3/4 Inch Copper Tubing, 1/8 Inch NPT Throttle Port For Gearheads

3/4 to 1/2 in NPT Pilot Unloader Valve for Air Compressors
✔️ Brass bodied valve: 1/2" NPT outlet, 3/4" copper inlet, 145-175 psi

This piloted discharge check valve blends a pilot valve, a pressure discharge valve, and a check valve into one unit to keep air delivery steady and unload when needed. It’s commonly used on gas-engine or electric-motor air compressors where reliable pressure regulation matters.

✅ Material: Machined brass
✅ Outlet: 1/2" NPT to tank
✅ Inlet: 3/4" copper tubing side inlet
✅ Port: 1/8" NPT throttle/unloader
✅ Factory set: 145 psi cut-in, 175 psi cut-out (adjustable 30-40 psi)
✅ Max flow: 30 cfm
✅ Muffler on exhaust port
✅ Made in the United States

💡 What is a piloted discharge check valve used for in air compressors?

It combines a pilot valve, a discharge valve, and a check valve to control and unload air pressure in one compact unit.

• unloads the compressor at the 145-175 psi window
• reduces cycling by venting through a muffled exhaust
• 1/8" NPT throttle port supports engine or unloader control
• outlet and inlet sizes match common air systems (1/2" NPT to tank, 3/4" copper inlet)

✝️