The SMC VHS40-N04A-Z is a 3-port manual residual pressure release valve from SMC's VHS series, sized for 1/2 inch NPT ports. Operators turn the handle to block incoming supply air while opening the exhaust port to vent downstream pressure before maintenance or servicing on pneumatic equipment. The model includes a locking mechanism that accepts padlocks to hold the valve in the shut-off position and prevent unintended reactivation. It mounts in line within compressed air circuits found in factory automation, machine tools, and assembly lines.
