How to maintain and install the pneumatic control valve?

The failure of the pneumatic control valve during use will cause great harm to the normal and stable operation of the system. Therefore, maintenance of the control valve is required to reduce the incidence of failure of the control valve.

1. Passive maintenance of pneumatic control valve
When the pneumatic control valve malfunctions, the control valve should be overhauled, the cause of the malfunction should be found out, and the maintenance should be carried out in time.

2. Preventive maintenance of pneumatic control valves
The regulating valve should be cleaned regularly to maintain the sanitation of the regulating valve and the integrity and durability of the various components. The pipeline should be flushed regularly, and attention should be paid to the blockage and garbage in the pipeline. The fixed connections of the regulating valve should be checked regularly to ensure the components The anti-corrosion performance and lubricity are good.

When installing the pneumatic control valve, reduce the hard pull and hard bend phenomenon in the installation, reduce the pressure and reduce the deformation. Keep the distance between the regulating valve and the compressor to reduce vibration from the source of vibration. It is necessary to conduct regular inspections of the regulating valve, pay close attention to the operation of the regulating valve, check whether the packing leaks, and add lubricating oil to the packing regularly.

3. Predictive maintenance of pneumatic control valves
Obtain the operating information of the regulating valve through smart meters or other diagnostic equipment, and strengthen the regulating quality and diagnostic function of the regulating valve. Through the diagnosis of intelligent instruments or other diagnostic equipment, the problems of the regulating valve can be found in time, and solutions can be found for maintenance in time. Increase the development and use of intelligent valve positioners.

Pneumatic control valve installation principle
(1) The installation position of the pneumatic control valve must be at a certain height from the ground, and a certain space must be left above and below the valve to facilitate the disassembly and repair of the valve. For regulating valves equipped with pneumatic valve positioners and handwheels, it is necessary to ensure convenient operation, observation and adjustment.
(2) The regulating valve should be installed on a horizontal pipeline and vertical to the pipeline up and down. Generally, it should be supported under the valve to ensure stability and reliability. For special occasions, when the regulating valve needs to be installed horizontally on a vertical pipeline, the regulating valve should also be supported (except for small-diameter regulating valves). During installation, avoid adding additional stress to the regulating valve).
(3) The working environment temperature of the regulating valve should be (-30～+60), and the relative humidity should not be greater than 95%.
(4) There should be straight pipe sections at the front and rear positions of the regulating valve, with a length not less than 10 times the pipe diameter (10D), to avoid that the straight pipe section of the valve is too short and affects the flow characteristics.
(5) When the caliber of the regulating valve is different from that of the process pipeline, a reducer should be used for connection. When installing the small-diameter regulating valve, threaded connection can be used. The fluid direction arrow on the valve body should be consistent with the fluid direction.
(6) To set up a bypass pipeline. The purpose is to facilitate switching or manual operation, and the regulating valve can be overhauled without stopping the machine.
(7) The control valve must be thoroughly cleaned of foreign matter in the pipeline, such as dirt, welding slag, etc., before installation.
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