The quick-install diaphragm valve is a type of shut-off valve that uses a diaphragm as the closing element to seal the flow path, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover. The diaphragm is commonly made of elastic, corrosion-resistant, and impermeable materials such as rubber or plastic. The valve body is often constructed from plastic, fiberglass, ceramics, or metal-lined rubber materials. It features a simple structure, excellent sealing and corrosion resistance, and low fluid resistance.

Principle and Composition of Quick-Install Diaphragm Valve

The quick-install diaphragm valve replaces the valve core assembly with a corrosion-resistant lined valve body and a corrosion-resistant diaphragm, utilizing the movement of the diaphragm for regulation. The valve body materials include cast iron, cast steel, or cast stainless steel, lined with various corrosion-resistant or wear-resistant materials, with the diaphragm made of rubber or polytetrafluoroethylene. The lined diaphragm offers strong corrosion resistance, making it suitable for regulating highly corrosive media such as strong acids and strong alkalis.

The quick-install diaphragm valve has a simple structure, low fluid resistance, and a larger flow capacity compared to other types of valves of the same specification. It is leak-free and can be used to regulate high-viscosity media and media containing suspended particles. The diaphragm isolates the medium from the upper cavity of the valve stem, so there is no need for packing, and the medium will not leak externally. However, due to the limitations of the diaphragm and lining materials, its pressure and temperature resistance are relatively poor, generally suitable for nominal pressures up to 1.6MPa and temperatures below 150°C.