SMC VHS40-N04-Z-D Mechanical Valve

SMC VHS40-N04-Z-D is a three-port, hand-operated pressure relief valve from the VHS40 family, designed for residual pressure release in pneumatic circuits. The 1/2 in nominal ports are NPT threaded (female) for inlet, outlet and exhaust connections, and the unit is specified as a single-action relief device with a maximum operating pressure of 0.1 to 1 MPa (approximately 14.5 to 145 psi). It is intended for air systems where rapid depressurization is required to vent residual pressure and protect downstream components, making it suitable for automatic control panels and valve manifolds in automation environments. The VHS40-D family is described in official catalogs as a 3-port valve for residual pressure release, with typical ambient-temperature ranges documented for VHS40-D variants at -5 to 60 C, aligning with common industrial operating conditions. The overall form factor is compact, with designs in this series measuring around 107 mm in length on standard VHS40 configurations, aiding installation in limited spaces. Availability and exact spec alignment for this variant are reflected in manufacturer and distributor listings from SMC, Grainger, Proax, and Purvis, confirming the VHS40-N04-Z-D designation as the 1/2 in FNPT end-style, 0.1–1 MPa relief valve for pneumatic applications.