SMC Corporation VHS40-04 Pneumatic Lockout Valve

SMC VHS40-04 is a 3-port, manually operated pneumatic relief valve with locking holes in the VHS series, designed to vent residual pressure in a line during maintenance and to support lockout/tagout safety. The 40 body size uses 1/2 in NPT connections (port size 04) for straightforward integration into standard pneumatic piping, and the unit is configured as a pressure-relief valve with lockable functionality to accept padlocks. The VHS40-04 family carries OSHA-standard compliance for safe depressurization, enabling maintenance teams to secure a line and reduce the risk of unexpected re-energization. Material options include A, a flame‑resistant PBT handle/bonnet, and B, an aluminum bonnet variant, providing durability in varied environments. This valve vents residual pressure to reduce hazards when servicing equipment, making it suitable for manufacturing, packaging, and automation line maintenance where a positive lockout is required. With its compact 3-port, manually operable design, the VHS40-04 delivers a reliable, field-proven solution for safe line depressurization in industrial pneumatic systems.