SRH3110-02: SMC Clean-Type Pressure Reducing Valve, the Precise Pressure Regulator for Industrial Pneumatic Systems
2026-01-07
Product Introduction
The SRH3110-02 is a clean-type pressure reducing valve manufactured by Japan’s SMC Corporation, belonging to the SRH series. Constructed with stainless steel, this valve features contamination resistance, oil-free design, and high-precision pressure regulation. It is widely used in industrial automation control systems to provide accurate pressure adjustment solutions for pneumatic equipment.
Core Product Advantages
- Contamination-Resistant Stainless Steel Specification Made of stainless steel, offering excellent corrosion resistance and contamination resistance. Suitable for applications requiring high cleanliness, ensuring long-term stable operation.
- Oil-Free Design Features an oil-free design, suitable for clean gases such as dry air and N₂. It prevents oil contamination in pneumatic circuits, making it particularly ideal for industries with high air quality requirements, such as electronics, food, and pharmaceuticals.
- Dual Diaphragm Material Options Offers a choice between PTFE and Fluororubber (FKM) diaphragm materials. Users can select the appropriate sealing material based on different operating environments and media characteristics, ensuring excellent sealing performance and durability.
- High-Precision Pressure Regulation Setting pressure range: 0.05~0.7 MPa. It provides high regulation accuracy, capable of precisely adjusting an unstable air supply pressure to a set value, thereby delivering a stable working pressure for downstream equipment.
Technical Parameters
| Parameter Item | Specification | Description |
|---|---|---|
| Series | SRH Series | Product Series |
| Body Size | 3 (1/4 inch) | Valve Body Size |
| Cleanliness Class | 1 (Class B) | Cleanliness Level |
| Setting Pressure Range | 0.05~0.7MPa | Pressure Regulation Range |
| Relief Valve Construction | 0 (Non-Relief) | Relief Method |
| Thread Type | Rc | Thread Specification |
| Port Size | 02 (1/4 inch) | Port Diameter |
| Operating Fluids | Ar / CO₂ / N₂ / Air | Applicable Media |
| Ambient Temperature Range | 0~60°C | Operating Temperature Range |
| Maximum Operating Pressure | 1.0MPa | Maximum Working Pressure |
| Proof Pressure | 1.5MPa | Pressure Resistance |
| Weight | Approx. 0.3kg | Product Weight |
Model Analysis
- SRH: SMC Clean-Type Pressure Reducing Valve series code.
- 31: Body Size 3, Cleanliness Class 1 (Class B).
- 10: Setting Pressure 1 (0.05~0.7 MPa).
- 02: Port Size: 1/4 inch (Rc).
Working Principle
The SRH3110-02 employs a pilot-operated pressure reducing valve structure. When the adjusting spring is in a free state, both the main valve and the pilot valve are closed. Rotating the handwheel clockwise pushes the pilot valve diaphragm downward, opening the pilot valve. The medium flows through the pilot valve to the upper side of the main diaphragm, pushing the main valve open. The medium then flows to the outlet and simultaneously enters the lower side of the pilot valve diaphragm, causing the outlet pressure to rise until it balances with the adjusted spring force.
When the outlet pressure increases, the pilot valve diaphragm moves upward, reducing the pilot valve opening. Concurrently, the flow of medium entering below the main diaphragm decreases, pressure drops, and the outlet pressure decreases to achieve a new balance. The opposite occurs if the outlet pressure falls. Through this pressure feedback mechanism, the pressure reducing valve can automatically adjust the valve core opening, maintaining a constant outlet pressure.
Typical Application Scenarios
- Industrial Automation Production Lines Used in automated production lines for automotive manufacturing, electronic device production, etc., to control the air supply pressure for pneumatic actuators. This ensures that equipment like cylinders and grippers receive a stable working pressure, improving production efficiency and product quality.
- Packaging Machinery Controls the pneumatic circuits for actions like material conveying, sorting, and marking in packaging machines. The pressure reducing valve provides a stable supply pressure for pneumatic actuators, ensuring precision and stability in the production process.
- Precision Manufacturing Equipment Used in equipment for semiconductor manufacturing and precision machining to control the air supply pressure for pneumatic actuators. This ensures process stability and repeatability, enhancing product quality.
- Cleanroom Environments In cleanroom environments such as semiconductor manufacturing and biopharmaceuticals, this product delivers stable and reliable performance, meeting the demands of applications with extremely high environmental requirements.
Installation and Usage Considerations
- Installation Requirements The pressure reducing valve should be installed on a horizontal pipeline with the bonnet facing upward for easy operation and maintenance. Installation must strictly follow the flow direction indicated by the arrow on the valve body; reverse installation is prohibited. It is recommended to install a filter at the inlet of the pressure reducing valve to remove impurities from the medium, preventing clogging of the valve core or affecting sealing performance.
- Operating Environment The operating temperature range is 0~60°C; avoid use in excessively high or low temperatures. Maintain appropriate relative humidity levels to prevent moisture from affecting equipment lifespan. The operating medium should be filtered through a 40 µm or finer filter before use.
- Pressure Adjustment When adjusting the pressure, rotate the adjusting handwheel slowly while observing the outlet pressure gauge, adjusting the outlet pressure to the desired set value. After adjustment, tighten the lock nut to prevent the adjusting handwheel from loosening. It is recommended to install pressure gauges at both the inlet and outlet of the reducing valve for real-time pressure monitoring.
- Regular Maintenance Regularly inspect the connecting pipes and valves of the pressure reducing valve to ensure there are no leaks. Periodically clean the surface of the valve to maintain cleanliness. Routinely check the operational performance of the valve to ensure long-term stable operation. After prolonged shutdowns, it is recommended to perform an air purge before restarting.
- Safe Operation Ensure the equipment is properly grounded before operation to prevent electric shock risks. Avoid contact with moving parts during operation to prevent injuries. In case of equipment malfunction, stop operation immediately and have it repaired by professionals. Always depressurize before installation to prevent injuries from high-pressure medium discharge. Do not exceed the product’s rated pressure, temperature, and medium specifications.
Closing Summary
The SRH3110-02 Clean-Type Pressure Reducing Valve is the “precise pressure regulator” in the field of industrial automation. It perfectly combines contamination-resistant stainless steel construction, an oil-free design, and high-precision pressure regulation, providing efficient, reliable, and clean pressure adjustment solutions for various industrial applications.
Choosing the SRH3110-02 means selecting high precision and high reliability to drive your automation system toward greater efficiency!
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