What kind of valve diaphragm valve belong to? How to choose correctly?

diaphragm valve clamping type valves, it mainly in the line for opening and closing.

diaphragm valve has two main advantages: one is the Industrial Valves does not need to separate stem packing seal structure, the diaphragm in the cutting medium of the valve stem seal effect at the same time, the other is flexibility strong diaphragm close and reliable, even for dispensers can do good to cut off. Therefore, operating mechanism and media channels completely separated, the diaphragm valve can not only apply to the food industry and medical industry, but also applies to some difficult to transport medium and greater danger of medium.

usually, the conditions of use or in sealed performance is strict, mud medium, wear, light structure, low voltage cutoff ( Small pressure difference) A small amount of leakage, abrasive medium into the atmosphere when the diaphragm valve is used in the recommendation. In two position adjustment, throttling, channel shrinkage, low noise, have spirit point and evaporation phenomena and manipulation of the torque of the occasions to choose diaphragm valve. Medium at high temperature and high pressure medium, high pressure cut-off ( Differential pressure) , crane fast, structure under the condition of short day length chose not to use the diaphragm valve, except the metal diaphragm valve.

the structure characteristics of the metal diaphragm valve is a set of thin metal film clip of hemispherical solid within the body, as a barrier between the stem and fluid. is closed by stem head and press the valve plate of metal film on the seat. The valve opening is through an internal spring, when the stem rises and out of contact with the membrane, valve plate is rising. Because of the valve stroke is equal to the film, thus the characteristics of the valve lift valve is much smaller than normal. In order to overcome the resistance loss caused by low lift, large than general valve seat and the circulation area, the purpose is to have a larger flow. Due to the valve seat is larger, the force of valve is much larger than usual, in order to get enough on valve sealing force, because there is no direct contact between the valve stem and valve disc. plate will not through the valve stem and the leave the seat, so the valve used in differential pressure flow in one direction, and usually medium is from 'seat' below. But in use should be avoided a lot of reflux, lest affect the closing of the valve. In general, under high temperature and high pressure choose metal diaphragm valve is economic and effective; Diaphragm valve can also choose in don't want to use the synthetic rubber diaphragm valve of low temperature and low pressure situations.

diaphragm valve installation maintenance

(1) the diaphragm valve pipe installation should be checked carefully before the operation condition are consistent with the use of the provisions of this valve, and should be cleaning the inner chamber, in order to prevent dirt jam or damage the sealing parts.

(2) the rubber lining layer and the rubber membrane surface do not besmear brushs oil kind items, in case the rubber swelling, affect the service life of the diaphragm valve.

(3) the handwheel or transmission mechanism, does not allow for lifting, and collision is forbidden.

(4) manual valve diaphragm, not with the aid of auxiliary lever, to prevent excessive torque drive component or sealing parts and injury.

5 diaphragm valve should be stored in dry and ventilated room, it is strictly prohibited to pile up, inventory diaphragm valve at both ends of the channel must be sealed, and open-close part should be slightly open.

key words: the diaphragm valve installation and maintenance, the structure characteristics of the metal diaphragm valve, diaphragm valve
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