Diaphragm valve knowledge
Diaphragm valve knowledge
Diaphragm valve is a special form of cut-off valve, appeared in the 1920s, its opening and closing parts is a piece of diaphragm made of soft material, it will be separated from the valve body cavity and valve cover cavity and drive parts, so called diaphragm valve. Diaphragm valve is but actually "clamped" valve, a flexible, can be one of the diaphragm, connected by stud in compression, the compression is operating by the stem and move up and down, when the compression a rose, the diaphragm is exalted, and cause pathway, when compressed down, weir diaphragm pressure in the body (if the weir valve) or pressure in the bottom of the outline (if for straight-through), diaphragm valve is suitable for the switch and the throttle.
Diaphragm valve features
Diaphragm valve z prominent feature is the diaphragm of the lower body cavity and upper cover cavity separated, so that the above diaphragm stem, disc and other parts are not by medium corrosion, eliminating the packing sealing structure, and will not produce media leakage.
The diaphragm made of rubber or plastic is of good sealing property. As the diaphragm for wear parts, should be replaced periodically depending on the characteristics of the medium. Limited by diaphragm material, suitable for low pressure and relatively low temperature occasions.
Classification of diaphragm valves
Diaphragm valve according to the structural form can be divided into: room type, straight flow, cut-off type, straight through type, gate type and right-angle type six; Connection form is usually flange connection; According to the driving mode can be divided into manual, electric and pneumatic three, which pneumatic drive is divided into normally open, normally closed and reciprocating three.
British standard lining diaphragm valve itself structure design reason is particularly suitable for ultra pure medium or serious pollution, very viscous liquid, gas, corrosive or inert medium. When combined with control equipment, diaphragm valve can replace other traditional control systems, especially for solid and easily contaminated inert media. The products are mainly used in biopharmaceutical, food and industry. And electric power, chemical, electroplating, etc in industrial water treatment, has been used in the semiconductor wafer production, diaphragm valve is particularly applicable to transport corrosive, a viscous fluid, such as mud, food, medicines, woven d glue liquid and so on, due to the pipeline, diaphragm valve operating agencies, it is not exposed to the delivery of fluid, so is not contaminated, also do not need packing, stem packing department is not likely to leak.