Characteristics and applicable temperature of diaphragm valve

Diaphragm valve is a special form of shut-off valve that appeared in the 20th centuryDai. Its opening and closing component is a diaphragm made of soft material, which separates the valve body cavity from the valve cover cavity and driving components, hence the name diaphragm valve.The main Diaphragm Valve product names of China Diaphragm Valves Network include:BS Manual Weir-type Diaphragm Valve,BS Pneumatic Weir-type Diaphragm Valve,BS Reciprocating-type Pneumatic Rubber Lined Diaphragm Valve,Electric Pipe Pinch ValveElectric Rubber Lined, Fluorine Diaphragm Valve,Engineering Plastic Diaphragm Valve

Characteristics of diaphragm valve:

The most prominent feature is that the diaphragm separates the lower valve body cavity from the upper valve cover cavity, so that the valve stem, valve disc and other parts located above the diaphragm are not corroded by the medium, eliminating the need for packing sealing structure and preventing medium leakage.Diaphragm Valve

1. Diaphragm made of soft sealing materials such as rubber or plastic has good sealing performance. Due to the vulnerability of the diaphragm, it should be replaced regularly based on the characteristics of the medium.

2. Due to the limitations of diaphragm materials, diaphragm valves are suitable for low-pressure and relatively low temperature applications.

3. Diaphragm valves can be divided into six types according to their structural forms: house type, DC type, globe type, straight through type, gate type, and right angle type; The connection form is usually flange connection; According to the driving mode, it can be divided into three types: manual, electric, and pneumatic. Among them, pneumatic driving is further divided into three types: normally open, normally closed, and reciprocating.

4. It is generally not suitable for use in pipelines with temperatures above 60 degrees and for transporting organic solvents and strong oxidizing media, nor should it be used in pipelines with higher pressures

The use temperature and applicable medium of diaphragm valve lining material:

Lining material (code) - operating temperature (℃) - applicable medium;

Hard rubber (NR): -10-85 hydrochloric acid, 30% sulfuric acid, 50% hydrofluoric acid, 80% phosphoric acid, alkali, salt, metal plating solution, sodium hydroxide, potassium hydroxide, neutral saline solution, 10% sodium hypochlorite, warm chlorine gas, ammonia gas, most alcohol organic acids and aldehydes, etc;

Soft rubber (BR): -10~85% cement, clay, coal ash, granular fertilizers, solid fluids with strong abrasion resistance, various concentrations of thick viscous liquids, etc;

Fluororubber (CR): -10~85 animal and vegetable oils, lubricants, and corrosive slurries with a wide range of pH changes

Butyl rubber (HR): -10 to 120 organic acids, bases, hydroxides, inorganic salts and acids, elemental gases such as alcohols, aldehydes, ethers, ketones, etc;

Polyvinylidene fluoride ethylene propylene plastic (FEP): ≤ 150, except for molten alkali metals, elemental fluorine, and aromatic hydrocarbons, hydrochloric acid, sulfuric acid, aqua regia, organic acids, strong oxidants, alternating concentrated and dilute acids, acid-base alternation, and various organic solvents, etc;

Polyvinylidene fluoride plastic (PVDF): ≤ 100;

Polytetrafluoroethylene and ethylene copolymer (ETFE): ≤ 120;

Fusible polytetrafluoroethylene plastic (PFA): ≤ 180;

Polytrifluorochloroethylene plastic (PCTFE): ≤ 120;

Enamel: ≤ 100, avoid sudden temperature changes, other low corrosive media except hydrofluoric acid, concentrated phosphoric acid, and strong alkali;

Cast iron without lining: The operating temperature is determined by the diaphragm valve material, and it is a non corrosive medium;

Stainless steel without lining: generally corrosive media;

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