Pneumatic butterfly valves are used for the control of solid materials, which are often used as discharge valves at the bottom of tanks, such as tank bottoms for cement tanks and stone powder tanks, for discharging and quick cutting. Because the dust material mostly contains large or small particles, the wear on the sealing surface of the valve is undoubted. If the type is not properly selected, the service life of the valve will be greatly reduced, or the internal leakage of the valve will be quickly caused and the use will continue to be affected. Batching weighing system, the entire ingredients process with PLC to achieve automatic control, and the dispensing cart of the ingredients is a pneumatic three-offset butterfly valve, medium is a very fine stone powder. After a certain period of time, the internal leakage of the valve caused the stone powder to leak from the pile to the workbench. This medium was very fine and sticky. Although the car was equipped with a vibration motor, many materials were attached to the tank. Wall and valve parts, when the valve is closed, stuck around the sealing surface, so that the valve can not be completely closed, resulting in leakage after re-installed materials, over time, but also make the sealing surface wear is very powerful, and even appear out of the groove .
In the powder system, the vibration time of the motor is prolonged, and all the materials are oscillated as much as possible, and then the valve is closed; the zero point of the weighing instrument is adjusted, and the material must be displayed after all the materials come out. At this time, the valve is closed by the PLC. The signal; to replace the three eccentric butterfly valve double eccentricity hard seal butterfly valve (medium-line sealing rubber butterfly valve can also be used, taking into account the occasional large particles in the material, the rubber seal may not be durable if there is no fine particles of powder, can be considered Soft seal butterfly valve), because the valve seat of the triple eccentric butterfly valve is an inclined sealing surface, that is, the surface seal, so the material is easy to accumulate on the sealing surface, can not be quickly discharged, and single eccentric or double eccentric butterfly valve does not have this drawback. Even if there is a little material on the sealing surface, it is scraped by the valve plate when the valve is closed, thus ensuring a good seal, and the sealing surface is durable.
Pneumatic butterfly valve in the powder system, there are other factors that need to be considered, such as: can not let the material directly from the top into the car when the valve is flushed to the valve plate (this impact will make the valve can not close the tight), and The static pressure of the material must also not exceed the design pressure of the pneumatic butterfly valve, and so on. The difference between a control valve and an ordinary manual valve is that it cannot be viewed as an isolated element, but it must be considered as part of the entire automatic control system. Many problems in the use of control valves are not the selection and The problem of configuration, but because the user's lack of understanding of the control valve caused the control valve to fail to coordinate with the control system. As long as the key to the problem is recognized, the correct selection of the valve, and the debugging of the control valve during the system commissioning phase, the failure rate can be greatly reduced and the long-term stable operation of the automatic control system can be achieved.
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