VEX1900-20: SMC Large Flow Capacity Pressure Reducing Valve, the High-Flow Pressure Control Expert for Industrial Pneumatic Systems
2025-12-30
The VEX1900-20 is a large flow capacity pressure reducing valve produced by Japan’s SMC Corporation, belonging to the VEX1 series. This pressure reducing valve features a large-capacity exhaust design, boasting characteristics such as high flow capacity, compact structure, and high regulation accuracy. It is widely used in industrial automation control systems to provide stable and precise pressure regulation for pneumatic actuators.
Core Product Advantages
- Large Flow Capacity Design Utilizes a large-capacity exhaust structure, with flow capacity significantly superior to traditional pressure reducing valves, capable of meeting high-flow application demands. It is especially suitable for pressure control in large-flow pneumatic systems.
- Extensive Size Selection Offers a variety of port size choices from 1/8 inch to 2 inches, allowing for flexible selection based on actual application needs and compatibility with pneumatic systems of different specifications.
- Compact Structure Features a direct piping design, resulting in a compact structure and small installation space, facilitating use in automated equipment with space constraints.
- Easy Operation Employs a pneumatically controlled operation method, offering convenient adjustment and simple maintenance, reducing operational difficulty and improving work efficiency.
Technical Specifications
| Parameter Item | Specification Value | Description |
|---|---|---|
| Main Body Size | 9 | Direct Piping Type |
| Operation Method | 0 | Pneumatically Controlled Type |
| Port Size | 20 | 1(P):2;2(A):2;3(R):2 |
| Thread Type | Rc | Metric Thread |
| Operating Pressure Range | 0.1~1.0 MPa | Working Pressure Range |
| Maximum Operating Pressure | 1.0 MPa | Maximum Working Pressure |
| Set Pressure Range | 0.05~0.9 MPa | Adjustable Pressure Range |
| Medium | Air | Suitable Medium |
| Ambient Temperature | 0~50°C | Operating Temperature Range |
| Lubrication Method | Non-Lubricated Type | Lubrication Method |
| Piping Type | Direct Piping Type | Connection Method |
| Port Size for P, R Ports | 2 | Port Specification |
Working Principle
The VEX1900-20 pressure reducing valve reduces the inlet pressure to a required outlet pressure through regulation and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. From a fluid dynamics perspective, the pressure reducing valve is a throttling element with variable local resistance. By changing the throttling area, the flow velocity and kinetic energy of the fluid are altered, resulting in different pressure losses to achieve pressure reduction. Then, through regulation of the control and adjustment system, the fluctuation of the downstream pressure is balanced with the spring force, maintaining the downstream pressure constant within a certain error range.
When the output pressure of the pressure reducing valve is high or the nominal diameter is large, a pilot-operated structure is adopted. The pilot-operated pressure reducing valve changes the flow velocity and kinetic energy of the fluid within the pipeline system by altering the throttling area, creating varying degrees of pressure loss to achieve pressure reduction inside the pipeline. Through meticulous control and adjustment, the pressure fluctuations within the valve are balanced with the spring force, ultimately keeping the downstream pressure in the pipeline constant within a specified error range.
Typical Application Scenarios
- Industrial Automation Production Lines Used in automated production lines such as automotive manufacturing and electronic equipment production to control the actuation speed and force of pneumatic actuators, achieving precise positioning, clamping, and handling of workpieces, thereby improving production efficiency and product quality.
- Packaging Machinery For action control in packaging machines, such as material conveying, sorting, and marking. Pressure adjustment enables flexible grasping and positioning of different materials, ensuring precision and stability in the production process.
- Robotics Serves as the pneumatic control system for robots, coordinating with robotic arms to achieve grasping, positioning, and placement of workpieces. Precise pressure control enables flexible grasping and collision prevention functions.
- Precision Manufacturing Equipment In equipment for semiconductor manufacturing, precision machining, etc., used to control the actuation accuracy of pneumatic actuators, ensuring the stability and repeatability of the processing process, and enhancing product quality.
Installation and Usage Precautions
- Installation Requirements The pressure reducing valve should be installed vertically on a horizontal pipeline. The arrow direction on the valve body must be consistent with the fluid flow direction and must not be installed backwards. Before installation, check that the air supply pressure meets the 0.1~1.0 MPa requirement and ensure the air source is clean. Sufficiently long straight pipe sections should be maintained before and after the pressure reducing valve (typically 5DN before and 10DN after, where DN is the pipe diameter) to ensure stable flow and improve control accuracy.
- Operating Environment The operating temperature range is 0~50°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 connecting pipelines and valves of the pressure reducing valve to ensure there are no leaks. Periodically clean the surface of the pressure reducing valve to keep it clean. Regularly check the operational performance of the pressure reducing valve 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 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 VEX1900-20 large flow capacity pressure reducing valve is the “High-Flow Pressure Control Expert” in the field of industrial automation. It perfectly combines large flow capacity, compact design, and high-precision regulation, providing an effective, reliable, and convenient air pressure regulation solution for various industrial applications.
Choosing the VEX1900-20 means choosing to drive your automation system towards higher efficiency with high flow and high reliability!
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