Diaphragm valve which type of valve? How to choose correctly? Diaphragm valve is a type of valve, which is mainly used in the pipeline opening and closing purposes. Diaphragm valve has two main advantages: First, the valve does not require a separate valve stem packing seal structure, the diaphragm at the same time cut off the media played the role of the valve stem seal, and the second is very flexible diaphragm closed and reliable, Even on the liquid can do a good cut. Therefore, the control mechanism and the media channels are completely separated, so that the diaphragm valve can not only be suitable for the food industry and medical and health industry, but also for some difficult to transport medium and more dangerous medium. Typically, the use of conditions or requirements in the strict sealing performance, mud medium, wear, light structure, low pressure cut-off (small pressure) to the atmosphere a small amount of leakage, abrasive medium recommended diaphragm valve. In the two-bit regulation, throttling, channel shrinkage, low noise, cavitation and vaporization phenomenon, the manipulation of small torque occasions can choose diaphragm valve. In high temperature medium, high pressure medium, high pressure cutoff (large pressure difference), opening and closing fast action, the structure of the short length conditions do not choose to use the diaphragm valve, except metal diaphragm valve. The structural feature of a metal diaphragm valve is the clamping of a thin, hemispherical sheet of metal within the valve body as a barrier between the valve stem and the fluid. Valve closure is achieved by pressing the valve stem against the valve seat through the valve stem and metal foil. Valve is opened by an internal spring, when the valve stem rises and out of contact with the film, the valve plate rises. As the valve stroke is equal to the film's stroke, so the characteristics of this valve lift than the average valve is much smaller. In order to overcome the loss of resistance due to the low lift, the valve seat and flow area than the average valve, the purpose is to get a larger flow. Due to its large seat size, this valve provides much greater force than conventional valves to provide sufficient sealing force on the valve disc because there is no direct contact between the valve stem and valve disc. The valve disc will not pass the valve stem to leave the valve seat, so this valve is suitable for one-way flow with differential pressure, and the medium is usually from the "valve seat." However, in use should avoid a lot of back, so as not to affect the valve closed. In general, high temperature, high pressure under the selection of metal diaphragm valve is economical and effective; diaphragm valve can also be used in the do not want to use synthetic rubber diaphragm valve low temperature and low pressure occasions. Diaphragm valve installation and maintenance ①diaphragm valve installed before installation should be carefully checked whether the operating conditions of the valve in line with the scope of use and should clean the cavity to prevent dirt blocking or damage to seal parts. ② rubber lining and rubber membrane surfaces do not brush grease, to prevent swelling of rubber, diaphragm valve life. ③ hand wheel or transmission mechanism, do not allow lifting, and no collision. ④ Manual operation of the diaphragm valve, not by means of an auxiliary lever, to prevent excessive torque damage to the drive parts or sealing parts. ⑤ diaphragm valve should be stored in a dry and ventilated room, non-stacked, the diaphragm valve at both ends of the channel must be sealed, and the opening and closing pieces should be slightly open state. Non-Standard Mold Base,Plastic Non-Standard Mold Base,Precision Non-Standard Mold Base,Custom Non-Standard Mold Base DoHform Mold(China) Co,.Ltd. , https://www.dhform.com
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