Pneumatic control valves are driven by compressed gas as the power source, with cylinders as the actuators, and with the assistance of accessories such as valve positioners, converters, solenoid valves, position-holding valves, air tanks, and gas filters to drive the valves, achieving on-off or proportional regulation. They receive control signals from industrial automation control systems to adjust various process parameters of pipeline media, such as flow rate, pressure, temperature, and liquid level.
Installation Precautions:
1. Always follow the installation guidelines and precautions for pneumatic control valves during the installation process.
2. The working environment temperature of the control valve should be within the range of (-30℃ to +60℃), and the relative humidity should not exceed 95%.
3. There should be a straight pipe section of no less than 10 times the pipe diameter (10D) before and after the control valve to avoid a too short straight pipe section that may affect the flow characteristics.
4. Read the instruction manual before installing the valve. The manual introduces the product and the safety precautions and preventive measures to be taken before and during installation.
5. Ensure the pipeline is clean: Foreign substances in the pipeline may damage the sealing surface of the valve or even prevent the movement of the valve core, ball or butterfly plate, causing the valve to fail to close properly. To reduce the possibility of dangerous situations, all pipelines should be cleaned before installing the valve. Confirm that all dirt, metal debris, welding slag and other foreign substances have been removed from the pipeline. Also, check the flange to ensure a smooth gasket surface. If the valve has threaded connections, apply high-grade pipe sealant to the male thread of the pipeline. Do not apply sealant to the female thread, as excess sealant on the female thread may be squeezed into the valve body. Excess sealant can cause the valve core to jam or accumulate dirt, leading to the valve not closing properly.
6. Carefully inspect the control valve: Before installation, check and remove all transportation blocks, protective plugs or covers on the gasket surface, and inspect the interior of the valve body to ensure there are no foreign substances.
7. The control valve should be installed on a horizontal pipeline and be vertical to the pipeline. Generally, support should be provided under the valve to ensure stability and reliability. For special cases where the control valve needs to be installed horizontally on a vertical pipeline, support should also be provided for the valve (except for small-diameter control valves). During installation, avoid applying additional stress to the control valve.
8. Ensure there is sufficient space above and below the valve for easy disassembly of the actuator or valve core during inspection and maintenance. For flanged valve bodies, ensure the flange faces are accurately aligned to ensure uniform contact of the gasket surface. After aligning the flanges, gently tighten the bolts and finally tighten them in a crisscross pattern.