Product Overview
SMC VHS20-N02B-Z Pneumatic Relief Lockout Valve – Unused, New Old Stock
The SMC VHS20-N02B-Z is a compact, single-action relief valve designed to isolate and exhaust downstream air in pneumatic circuits with a simple quarter-turn handle. It provides a clear, mechanical means of lockout to ensure actuators, tools, and manifolds remain safely depressurized during maintenance.
The VHS series is widely used across industrial automation for its reliability, straightforward operation, and small footprint. This model incorporates a body size 20 frame, 1/4-inch NPT ports, and a Z-option label showing pressure units in psi for quick reference on mixed-standard production floors.
Product Condition
Unused, new old stock, without the manufacturer's packaging. Clean with minor signs of handling from storage.
Product Overview
Operation is intuitive: rotate the handle 90 degrees to shut off supply air and vent the downstream circuit to atmosphere. The exhaust path (OUT to EXH) ensures residual pressure is released, supporting safe servicing of connected equipment. A padlock can be applied to prevent accidental re-pressurization, meeting common lockout/tagout practices.
The VHS20-N02B-Z is rated for air media from 0.1 to 1.0 MPa (15–145 psi), with a proof pressure of 1.5 MPa. Its operating temperature range spans −5 to 60°C when dry and unfrozen. The aluminum body and red handle provide durability and clear visual status, and the compact dimensions (approximately 40 mm H × 28 mm W × 59 mm L) allow easy inline or panel mounting.
Key Features
- Single-action pneumatic relief valve for quick isolation and exhaust
- 1/4-inch NPT ports (N02) in body size 20
- Aluminum body with B-suffix bonnet/handle configuration
- Z-option label with pressure units displayed in psi
- 90-degree handle rotation vents downstream air for safe maintenance
- Padlock-ready design for lockout/tagout procedures
- Operating pressure range: 0.1–1.0 MPa (15–145 psi)
- Proof pressure: 1.5 MPa; operating temp −5 to 60°C (no freezing)
- Compact form factor, approximately 92 g mass
- Compatible with SMC brackets, silencers, and FRL spacers
Applications
- Isolating air supply to actuators, cylinders, or pneumatic tools
- Lockout/tagout of robots, conveyors, and assembly line equipment
- Depressurizing manifolds before service or component replacement
- Integrating safety shutoff points in FRL assemblies
- Machine-side exhaust for maintenance personnel access
- Panel-mounted pneumatic safety stations
Frequently Asked Questions
What happens when the handle is turned?
A 90-degree turn blocks the supply path (IN to OUT) and vents downstream air to EXH, depressurizing connected equipment.
Is this valve lockable?
Yes. A padlock can be inserted to prevent unintended handle movement and accidental re-pressurization.
Can this be disassembled for repair?
No. VHS series valves are non-serviceable; SMC does not offer repair parts for internal components.
Is it suitable for compressed gases other than air?
It is rated for air media. For other gases, consult SMC documentation and facility safety requirements.
Does the Z option change performance?
No. The Z suffix indicates the label shows pressure units in psi; functional specs remain the same.
The VHS20-N02B-Z reflects SMC’s practical engineering approach: a simple mechanical action that brings a pneumatic system to a safe, quiet halt. Once installed, it becomes a dependable checkpoint in your maintenance workflow.
