SMC Corporation VHS30-03B Pressure Relief Valve

The SMC VHS30-03B is an OSHA-standard, three-port, single-action pressure-relief valve with locking holes designed to vent excess pressure from compact pneumatic circuits in automation and manufacturing environments. It uses a 3/8 in nominal port size and a die-cast aluminum body for durability in harsh environments, and it sits within SMC’s VHS20/30/40/50 family of residual-pressure relief valves. The relief range is 0.1 to 1 MPa, enabling reliable depressurization at a controlled rate and preventing unintended buildup when equipment is stopped or when backflow or line restrictions occur. Locking holes on the valve body provide secure mounting in control panels, FRLs, or equipment housings, helping maintain correct orientation and stable operation during routine maintenance or vibration-heavy production cycles. Typical applications include venting residual pressure after shut-off, safeguarding downstream devices, and serving as a dedicated relief point in compact automation lines, robotics interfaces, or packaging machinery. As a 3-port pneumatically activated relief device, the VHS30-03B is designed for straightforward installation and reliable performance within standard pneumatic power systems.