Industrial 131CVT Check Valve Pilot Valve One Half Inch Flare In One Half Inch MPT Out

Rolair's 131CVT is a compact combination valve that functions as both a backflow check and a pilot/unloader for air compressors. It integrates a 1/2" flare inlet and a 1/2" MPT outlet, and is cataloged as a 131CVT check valve/pilot valve designed to automatically vent the discharge side to simplify starting and protect the motor. The unit is preset for a 115 psi cut-in and 135 psi cut-out, which aligns with common Rolair/MiTM style compressor pressure ranges and helps maintain stable tank pressure during cycles. By preventing reverse flow at tank pressure while enabling rapid recharging, the 131CVT supports efficient unloading when the compressor stops and smoother re-pressurization when it starts again. Typical plumbing uses 1/2" flare fittings on the inlet and 1/2" MPT fittings on the outlet, enabling straightforward connections to standard hoses and fittings found in many compressor systems. This valve is listed in Rolair’s official parts catalogs as a check/pilot combo valve (part number 131CVT), reinforcing its role as a dedicated replacement component in Rolair and related compressor configurations.