Valves Enameled and diaphragm

Diaphragm valves - type of pipe fittings designed to block the flow of aggressive working medium. The locking working element of the valve (diaphragm or membrane) moves parallel to the axis of the flow of the working medium. The working surface of the diaphragm valve is coated with an anti-corrosion compound, for example PTFE.

Scheme of the structure and principle of operation of  diaphragm valve

                                                                                            1. Body; 2. Stock; 3. Membrane.

In diaphragm valves, the external seal is provided with a membrane made in the form of an elastic disk of elastic materials (rubber, fluoroplastic, polyethylene, etc.). The membrane profile allows reciprocating movement in its central part, sufficient to close or open the valve or regulating valve body. The membrane is installed and clamped on the outer diameter between the body and the valve cover. Such a device lined and enameled valve (valve) provides a tight connection of body parts and completely isolates the internal cavity of the valve from the stem. The internal working surfaces of the valve (valve) are coated (lined) with corrosion-resistant materials (PTFE, rubber, polyethylene, enamel). This design eliminates the need for expensive stainless steel and operates cast iron valves for aggressive environments.
 

Advantages of diaphragm valves:

• simplicity of design;
• maintainability;
• low cost of the valve;
 

Disadvantages of diaphragm valves:
 

• short membrane service life;
• the use of a membrane limits the use of the valve in terms of pressure and temperature;