About pneumatic butterfly valve used in gas and liquid medium occasion we have discussed more, and because of pneumatic butterfly valve used for solid materials ( Such as dust, powder) The situation is not much, so in terms of selection and use of the many places worthy to be discussed. Combined with practical experience about YiDeZhiJian below. Butterfly Industrial Valves is used for solid materials control, often is in the tank bottom to use as a feeding valve, such as cement tank, such as the powder tank bottom, 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. There is such a case: there is a burden weighing system, the whole 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 customer reflect the valve leakage, the stone piles often leaks on the workbench. Return valve factory is no leakage detection, reflect the valve is used, and customers, and the same medium, there have been no such a thing. To find out why, the company sent to the scene, finally find out the reason, it turns out that this medium is very thin, and a bit of a sticky, although ingredients on the car is equipped with vibration motor, eventually there are quite a few parts are attached to the tank wall and the material Industrial Valves, the valve closing, 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. After find out the reason, proposed the solution: in the PLC program, extend the motor vibration time, after all shake out the material as far as possible to 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 - — 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. After such a transformation, such problem never happened. In such a 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 that you can't take it as an isolated elements, and must take it as an integral part of the whole control system, control valve of many problems in use, is not the type selection and configuration problems, 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.
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