VHS20-01B-S: SMC 3-Port Valve with Lockhole and Residual Pressure Release, The Safety Control Expert for Industrial Pneumatic Systems
2026-01-04
The VHS20-01B-S is a 3-port valve with lockhole and residual pressure release, manufactured by SMC Corporation of Japan, belonging to the VHS series. This valve adopts a manual switching structure, featuring functions like residual pressure release, a lockhole design, and ease of operation. It is widely used in industrial automation control systems as a safety measure to prevent accidents caused by residual pressure in pneumatic control systems.
Core Product Advantages
- Complies with OSHA Safety Standards Designed in accordance with the U.S. Occupational Safety and Health Administration (OSHA) standards, ensuring safety during use in pneumatic control systems and preventing accidents due to residual pressure.
- Lockhole Design In the exhaust position, the valve can be secured with a padlock, preventing accidental activation during cleaning or equipment maintenance, thereby enhancing operational safety.
- Clear Visual Status Indication The supply and exhaust statuses are clearly visible, facilitating operator monitoring of the system status and improving operational convenience.
- Two-Stage Operation Structure Features a two-stage operation structure requiring the handwheel to be pressed down and then rotated. This design helps prevent accidental operation, increasing operational reliability.
Technical Parameters
| Parameter Item | Specification | Description |
|---|---|---|
| Body Size | 20 | Product Size |
| Port Size | 01 (1/8 inch) | Port Thread Specification |
| Thread Type | Rc | Metric Thread |
| Knob/Bonnet Material | B | Flame-Retardant PBT |
| Operating Pressure Range | 0.1~1.0 MPa | Working Pressure Range |
| Max. Operating Pressure | 1.0 MPa | Maximum Working Pressure |
| Proof Pressure | 1.5 MPa | Pressure Resistance Capability |
| Operating Fluid | Air | Working Medium |
| Ambient Temperature | -5~60℃ | Operating Temperature Range |
| Operation Angle | 90° | Handwheel Rotation Angle |
| Cv Value (P→A/B) | 0.65 | Flow Coefficient |
| C Value (P→A/B) | 2.4 dm³/(s·bar) | Flow Coefficient |
| b Value (P→A/B) | 0.43 | Flow Coefficient |
Working Principle
The VHS20-01B-S employs a manual switching valve structure. When the handwheel is pressed down and then rotated, the valve switches via this two-stage action. In the exhaust position, the valve can be locked with a padlock to prevent accidental activation. The valve achieves safety control of the pneumatic system by controlling the flow direction and shut-off. When system maintenance is required, residual pressure in the pipeline can be released through this valve, ensuring operational safety.
Typical Application Scenarios
- Industrial Automation Production Lines Used in automated production lines for automotive manufacturing, electronic equipment production, etc., for residual pressure release and safety isolation in pneumatic systems, ensuring safety during equipment maintenance.
- Equipment Maintenance and Inspection Used during equipment shutdown for maintenance to release residual pressure in air lines, preventing accidents caused by such pressure and enhancing the safety of maintenance operations.
- Pneumatic Control Systems Used in pneumatic control systems for manual switching of air circuits, enabling control of pneumatic actuators and improving system reliability.
- Safety Isolation Systems Used in situations requiring safety isolation to shut off the air supply and release residual pressure, ensuring the safety of operators.
Installation and Usage Precautions
- Installation Requirements The valve should be installed on a flat, stable base to ensure stable operation. Before installation, verify that the air supply pressure meets the 0.1~1.0 MPa requirement and ensure the air source is clean. During installation, ensure the arrow direction on the valve matches the fluid flow direction.
- Operating Environment Operating temperature range is -5~60℃. Avoid use in excessively high or low-temperature environments. Relative humidity should be maintained below 90% to prevent moisture from affecting equipment lifespan. The operating medium should be filtered through a 40μm or finer filter before use.
- Regular Maintenance Periodically inspect the valve’s connecting pipes to ensure no leakage. Clean the valve surface regularly to maintain cleanliness. Periodically check the valve’s operational performance to ensure long-term stable operation.
- Safe Operation Ensure the equipment is properly grounded before operation to prevent electric shock hazards. Avoid contact with moving parts during operation to prevent injury. Immediately stop the equipment in case of malfunction and have it repaired by qualified personnel. Always release pressure before installation to prevent injury from high-pressure media discharge.
Concluding Summary
The VHS20-01B-S 3-Port Valve with Lockhole and Residual Pressure Release is the “Safety Control Expert” in the field of industrial automation. It perfectly combines residual pressure release, lockhole design, and manual switching functionality, providing an efficient, reliable, and safe pneumatic control solution for various industrial applications.
Choosing the VHS20-01B-S means choosing to drive your automation system towards higher efficiency with high safety and high reliability!
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