VHS30-03A: SMC 3-Port Valve with Lockable Residual Pressure Release, the Safety Control Expert for Industrial Pneumatic Systems
2025-12-30
The VHS30-03A is a 3-port valve with lockable residual pressure release produced by Japan’s SMC Corporation, belonging to the VHS series. This valve adopts a manual switching structure, featuring residual pressure release, a lockable design, and easy 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.
- Lockable Design In the exhaust position, the valve can be locked with a padlock, preventing accidental activation during cleaning or equipment maintenance, thereby enhancing operational safety.
- Clear Operation Status The air supply and exhaust statuses are clearly visible, making it easy for operators to monitor the system status and improving operational convenience.
- Dual-Action Structure Employs a dual-action structure requiring the handwheel to be pushed down and then turned, preventing accidental operation and improving operational reliability.
Technical Specifications
| Parameter Item | Specification Value | Description |
|---|---|---|
| Main Body Size | 30 | Product Size |
| Port Size | 03 | 3/8 Inch |
| Thread Type | Rc | Metric Thread |
| Knob/Cover Material | A | Flame-Retardant PBT |
| Operating Pressure Range | 0.1~1.0 MPa | Working Pressure Range |
| Maximum Operating Pressure | 1.0 MPa | Max Working Pressure |
| Proof Pressure | 1.5 MPa | Pressure Resistance |
| Medium | Air | Working Medium |
| Ambient Temperature | -5~60°C | Operating Temperature Range |
| Operating Angle | 90° | Handwheel Rotation Angle |
| Cv Value (P→A/B) | 8.3 dm³/(s·bar) | Flow Coefficient |
| b Value (P→A/B) | 0.41 | Flow Coefficient |
| Cv Value (P→A/B) | 2.3 | Flow Coefficient |
Working Principle
The VHS30-03A utilizes a manual switching valve structure. The valve is switched via a two-step action sequence: push down the handwheel, then rotate it. In the exhaust position, the valve can be locked with a padlock to prevent accidental opening. The valve achieves safety control in pneumatic systems by controlling the on/off and direction of fluid flow. When system maintenance is required, residual pressure in the lines can be released via this valve, ensuring operational safety.
Typical Application Scenarios
- Industrial Automation Production Lines Used in automated production lines such as automotive manufacturing and electronic device production 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 improving 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 scenarios requiring safety isolation to cut off the air supply and release residual pressure, ensuring the safety of personnel.
Installation and Usage Precautions
- Installation Requirements The valve should be mounted on a flat and 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 aligns with the fluid flow direction.
- Operating Environment The operating temperature range is -5~60°C. Avoid use in high or low-temperature environments. Relative humidity should be maintained below 90% to prevent moisture from affecting equipment lifespan. The medium used should be filtered through a 40μm or finer filter before use.
- Regular Maintenance Regularly inspect the valve’s connecting pipelines to ensure there are no leaks. Periodically clean the valve surface to keep it clean. Regularly check the valve’s operational performance to ensure long-term stable operation.
- Safe Operation Ensure equipment is properly grounded before operation to prevent electric shock hazards. Avoid contact with moving parts during operation to prevent pinching injuries. In case of equipment malfunction, shut down immediately and have it repaired by professionals. Always depressurize before installation to avoid injury from high-pressure media discharge.
Conclusion
The VHS30-03A 3-port valve with lockable residual pressure release is the “Safety Control Expert” in the field of industrial automation. It perfectly combines residual pressure release, a lockable design, and manual switching functionality, providing an efficient, reliable, and safe pneumatic control solution for various industrial applications.
Choosing the VHS30-03A means choosing to drive your automation system towards higher efficiency with high safety and reliability!
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