SMC VHS40-N04-Z Pneumatic Lockout Shutoff Valve

SMC VHS40-N04-Z is a 3-port pressure-relief valve with a built‑in lockout/shutoff function that accepts padlocks for lockout/tagout safety, part of SMC’s VHS series. It is a 1/2 in nominal valve with NPT end connections, designed to relieve residual pressure in a pneumatic line when the valve is locked out or actuated, providing a safe depressurization path during service. The unit is OSHA-standard compliant and intended for use with compatible FRLs to ensure safe maintenance. Operating in a range from 0.1 to 1 MPa (approximately 14.5 to 145 psi), some catalogs list a maximum operating pressure around 125 psi for this configuration. The 3-port design makes it suitable for inline shutoff and exhaust paths in common pneumatic circuits, such as lines feeding cylinders and actuators in industrial automation.