SMC VHS40-04B-XG-X2127 Pressure Relief 3 Port Valve

SMC VHS40-04B-XG-X2127 is a three-port residual-pressure relief valve in the VHS series, designed to vent leftover pressure from pneumatic lines after actuators release to prevent drift and preserve system safety. It features an aluminum die-cast body (body size 40) and a 1/2-inch port size (04), with IN, OUT, and EXH ports arranged for straightforward exhaust routing. This single-action valve is rated for a relief-pressure range of 0.1–1 MPa (about 14.5–145 psi), making it suitable for a wide range of automation circuits. The valve family supports multiple thread configurations, including Rc (BSP) and NPT, depending on the installation, so verify the exact threading on your specific unit. In practical use, it helps relieve residual pressure in pneumatic lines after a cylinder or actuator completes its stroke, improving cycle reliability and safety in equipment such as conveyors, pick-and-place machines, grippers, and clamping mechanisms. Where relevant, certain VHS40-04B sub-models are offered with locking holes to secure the valve in fixed positions in vibration-prone environments; check your exact catalog variant to confirm this feature.