During the installation and use of special valves, in order to achieve better application, it is necessary to pay attention to whether the installation mode of products is reasonable, because the installation effect of devices directly affects the actual application. When installing and using special valves, keep a certain distance from the ground. If the special valve is too close to the ground during installation, it is very inconvenient to carry out maintenance. Keeping a reasonable distance from the ground can provide convenient conditions for maintenance and meet the requirements of the installation specifications of the device.
In addition, the special valve needs to be fixed on the horizontal pipe to maintain the vertical effect, and also needs to be fixed and supported on the valve part. The installation standard can be reached by adjusting the distance of the valve. In order to make the use of the control valve more convenient, the staff should also pay attention not to add stress to the valve, which will affect the stability of the special valve. In addition, the ambient temperature of special valves should not be too high, and the humidity should also meet the standards. If the ambient temperature is too high or the humidity exceeds the standard range, the application of the control valve will be affected.
When installing and using pneumatic control valves, try to keep the environment dry. Generally, sundries should not be placed near the equipment. If there are too many sundries around the control valve, it will definitely affect the use of the device, which must be paid attention to.
In the automatic control of modern factories, special valves play a very important role, and the production of these factories depends on the correct distribution and control of flowing media. These controls, whether they are energy exchange, decompression or simple container feeding, need some final control elements to complete.
The special valve belongs to the control valve series. Its main function is to adjust the pressure, flow, temperature and other parameters of the medium. It is the final control element in the process circuit.
How to solve the leakage problem of special valves:
1. Method of adding sealing grease
For the electric control valve without sealing grease, consider increasing sealing grease to improve the sealing performance of the valve stem.
2. Method of adding filler
In order to improve the sealing performance of the packing to the valve stem, the method of adding packing can be adopted. Usually in the form of double-layer and multi-layer mixed fillers. Simply increase the number, for example, from 3 to 5. The effect is not obvious.
3. Substitute graphite filler method
As the operating temperature of the tetrafluoroethylene packing used in large quantities is within the range of - 20 ~ 200, when the upper and lower temperature values change greatly, its sealing performance will be significantly reduced, aging is fast, and its service life is short. Flexible graphite filler can overcome these shortcomings and has a long service life. Therefore, some valve manufacturers have changed polytetrafluoroethylene packing to graphite packing, and even newly purchased control valves have changed polytetrafluoroethylene packing to graphite packing.
4. Change the flow direction and place P2 at the end of the valve stem.
When p is large and P1 is large, it is obviously more difficult to seal P1 than P2. Therefore, the method of changing the flow direction can be used to change P1 at the valve stem end to P2 at the valve stem end. It is more effective for valves with high pressure and large differential pressure.
5. Adopt lens gasket sealing method.
For the sealing of the upper and lower covers, the sealing between the valve seat and the upper and lower valve bodies, if it is a planar seal, the sealing performance is poor at high temperature and high pressure, resulting in leakage. Lens gaskets can be used for sealing, and satisfactory results can be obtained.