SMC VHS30-03 Lockout 3-Port Pneumatic Hand Valve

SMC VHS30-03 Lockout 3-Port Pneumatic Hand Valve is a three-port, manually operated pressure-relief valve that lets you isolate the supply in a pneumatic line and exhaust downstream pressure for safe maintenance. Part of SMC's VHS family, it features locking holes and a single-action lever for quick, drop-in operation. The standard port configuration uses 1/4 in nominal ports for IN and OUT, with an integrated exhaust path, making it suitable for compact control circuits. In terms of airflow, the valve provides a Cv of 16 (0.87) from IN to OUT and a Cv of 14 (0.76) from OUT to EXH, per VHS30 specifications. It conforms to OSHA standard pressure-relief requirements for three-port lockout valves, helping prevent accidental redischarge during service. For protection, a feedside air filter is recommended on the IN side to guard against contaminants. Typical applications include isolating a compressed-air supply to cylinders or actuators and venting downstream pressure during maintenance or repair work, where a safe lockout is essential. The VHS30-03 design emphasizes safety and reliability in industrial pneumatic systems, providing a straightforward, manual means to ensure depressurized, locked conditions during servicing.