And the general structure of the valve diaphragm very different, is a new type of valve is a special form of cut-off valve, its opening and closing member is a diaphragm made of soft material, the body cavity and the valve cover cavity and drive components are separated, are now widely used in various fields. Commonly used rubber lined diaphragm valve has a diaphragm, lined diaphragm valves, diaphragm valves without lining, plastic diaphragm.
Diaphragm valve body and bonnet is built with a flexible diaphragm or a combination of the diaphragm, the closure member is a compression device connected to the diaphragm. Seat can be shaped weir, the flow path may be a straight wall. Advantages diaphragm is spaced from its operating mechanism and media access, not only to ensure the purity of the working medium, but also prevent the possibility of the impact of media in the pipeline operating mechanism of working parts. In addition, stem Department does not require any form of individually sealed, unless the use of the control of harmful media as a security facility. Diaphragm valves, since the working medium is in contact with the diaphragm and the valve body only, both can use a variety of different materials, so that the valve can be controlled over a variety of working medium, especially for chemically aggressive or with suspended particles medium. Diaphragm valve operating temperature usually restricted diaphragm and the valve body lining material used, its operating temperature range from about -50 ~ 175 ℃. Simple diaphragm structure consists only of the valve body, diaphragm and valve head assembly of three main components. The valve easily and quickly dismantled and repair, replacement of the diaphragm can be done in the field and in a short time.
Features:
(1) a small fluid resistance.
(2) can be used in medium containing rigid suspended solids; the only medium in contact with the body and diaphragm, so no stuffing, there is no stuffing box leakage problems, no corrosion could stem portion.
(3) suitable for corrosive, viscous, slurry medium.
(4) can not be used for higher pressure situations