About the introduction of general diaphragm valve

Diaphragm valve is a special form of shut-off valve. Its opening and closing part is a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving parts. The diaphragm valve is an elastic,perturbable diaphragm, which is bolted to the compression member. The compression member is operated by the valve stem and moves up and down. When the compression member rises, the diaphragm is lifted up, causing a passage, when the compression member When it descends, the diaphragm presses on the valve body weir (if it is a weir valve) or the bottom of the profile (if it is a straight-through type). The diaphragm valve is suitable for switching and throttling.

Applicable medium: The structural design of the diaphragm valve itself is especially suitable for ultra-pure medium or heavily polluted, very viscous liquid, gas, corrosive or inert medium. When combined with control equipment, the diaphragm valve can replace other traditional control systems, especially suitable for solid and easily polluted inert media. Products are mainly used in biopharmaceutical, food, industry; and industrial water treatment in power, chemical, electroplating and other industries, and also in the production of semiconductor wafers. Diaphragm valves are particularly suitable for transporting corrosive and viscous Fluids, such as mud, food, pharmaceuticals, and woven adhesives, etc., because the operating mechanism of the diaphragm valve in the pipeline is not exposed to the transport fluid, so it is not contaminating, no filler is required, and the stem packing It is impossible to leak.

The most prominent feature of the diaphragm valve is that the diaphragm separates the inner cavity of the lower valve from the inner cavity of the upper bonnet, so that the stem and valve flaps above the diaphragm are not corroded by the medium, the packing seal structure is omitted, and it will not occur. The media is leaking. Diaphragm made of soft seal such as rubber or plastic has good sealing performance. Since the diaphragm is a wearing part, it should be replaced regularly according to the characteristics of the medium. Limited by the diaphragm material, the diaphragm valve is suitable for low pressure and relatively low temperature occasions. Diaphragm valves can be divided into six types: house type, DC type, cut-off type, straight-through type, gate type and right-angle type; the connection type is usually flange connection; according to the driving method, it can be divided into manual, electric and pneumatic Among them, the pneumatic drive is divided into three types: normally open, normally closed and reciprocating