The application of pneumatic butterfly valve in the powder system

Pneumatic butterfly valve used for solid materials control, often is in the tank bottom to use as a feeding valve, such as cement tank, tank bottom powder cans, etc, used for feeding and quickly cut off. Because most of dust material contains big or small particles, the valve sealing surface wear is beyond doubt, improper selection, will greatly reduce the service life of the valve, or soon due to valve leakage, continue to use. Ingredients weighing system, the entire process of ingredients with PLC to realize automatic control, and the ingredients of trolley feeding valve selection is pneumatic triple eccentric butterfly valve, medium is a very fine powder particles. Use after a period of time, the valve leakage, the stone piles to leak on the workbench, often because of the media is very thin, and a bit of a sticky, although ingredients on the car is equipped with vibration motor, there many parts are attached to the tank wall and the material valve, the valve is closed, the card around the sealing surface, make the valve cannot be completely shut down, causing to add material leakage, over time, also make the sealing surface of wear, and even in groove. In the powder system, extend the motor vibration time, after all shake out the material as far as possible close the valve; Will be weighing device zero alignment, will do to the material shows zero, it until it is all at this time only by PLC signal that close the valve; Will triple eccentric butterfly valve replacement for elasticity of double eccentric hard sealing butterfly valve ( Also can use the midline rubber sealing butterfly valve, considering the material in the occasional big particles, rubber seal may not be durable & ndash; — If there is no fine powder particles, can consider to use soft sealing butterfly valve) Because of triple eccentric butterfly valve seat is a sealing surface, inclined surface is sealed, so the material is easy to accumulate in the seal surface, can't discharge quickly, eccentric and single or double eccentric butterfly valve, there is no the disadvantages, even a little seal face material, also was scraped the valve plate in the valve is closed, so as to ensure the good sealing, and sealing surface durability. Pneumatic butterfly valve in the powder system, there are other factors need to be taken into account, such as: can't keep the material from the above on the car directly rushed to the valve on the valve plate ( The impact can also make the valve cannot be closed tightly) And the static pressure of the material must be no more than the design of the pneumatic butterfly valve bearing pressure, and so on. The difference between the control valves and common manual valve is, can't take it as an isolated elements, and must take it as an integral part of the whole control system, control valve to use many of the problems, selection and configuration is not problem, but because of lack of awareness of control valve in control valve user fails to cooperate with control system debugging, good. As long as the key to realize problem, correct selection, the valve and control valve in the system debugging phase debugging good, can greatly reduce the failure rate, long-term stability of the automatic control system