Pneumatic butterfly valves powder system

A control valve for solid materials, often in the bottom of the tank as a discharge valve to be used, such as cement cans, powder cans bottom of the tank to discharge and rapid cutting. Because dust material containing mostly large or small particles on the valve sealing surface wear is beyond doubt, improper selection, will greatly reduce the life of the valve, or will soon cause valve leakage, affecting continued use. Batch weighing system, the entire batching process with PLC automatic control, and the ingredients used car is the discharge valve pneumatic butterfly valve, the medium is a very fine powder particles. After a period of time, valve leakage, resulting in piles of earth leakage regularly powder on the table, because this medium is very thin, and somewhat sticky, although the ingredients with a small vibrating motor car, and finally there are many materials attached to the tank parts of the walls and valves, the valve is closed, the card around the sealing surface of the valve is not fully closed, resulting in re-installation material leak occurred after the passage of time, but also so that the sealing surface wear is very powerful, and even emerged trenches . In the PLC program, the motor vibration prolonged shock out as far as possible all the material before shut-off valve; Zero the weighing instrument alignment, all materials will be out after the show zero, then close the valve was issued by the PLC signal; would replace three eccentric butterfly valve double eccentric resilient Plastic seal butterfly (midline sealing rubber valve can also be used, taking into account the material in the occasional large particles, the rubber seals may not be durable - if there is no fine powder particles can be Consider using a soft seal butterfly valve), because three eccentric butterfly valve seat sealing surface is an inclined, that is, face seal, so the material is easy to accumulate on sealing surfaces, can not quickly discharged, while the single eccentric or double eccentric butterfly valve would not have this drawbacks, even if the sealing surface is a little material, but also when the valve is closed by the valve plate scraped off, and thus ensure a good seal, and the Security seals surface durability.
Pneumatic butterfly powder system, there are other factors that need to be considered, such as: can not let the material into a small car from above the valve when the valve plate rushed directly (this impact also make valve can not close tightly), and the material static pressure also need not exceed the design bearing pressure pneumatic butterfly valve, and so on. Manual valves control valves with common difference is, you can not take it as an isolated element to look at, but it must be part of the system as a whole to consider the self-control, control valves used in many of the problems, not the selection and configuration problem, but because the user's lack of knowledge of the control valve control valve failed resulting control system commissioning, with the good. Recognizing a problem as long as the key, the correct selection of the valve, and in the commissioning phase of the control valve system debugging, we must, can greatly reduce the failure rate, so that long-term stable operation of the automatic control system.