Composition of Diaphragm Valve The diaphragm valve uses a corrosion-resistant lined valve body and a corrosion-resistant diaphragm instead of the valve core assembly, and uses the movement of the diaphragm to adjust. The valve body material of the diaphragm valve is cast iron, cast steel, or cast stainless steel, and is lined with various corrosion-resistant or wear-resistant materials, diaphragm materials such as rubber and polytetrafluoroethylene, such as rubber-lined diaphragm valve
. The lining diaphragm has strong corrosion resistance and is suitable for regulating highly corrosive media such as strong acid and strong alkali.
The diaphragm valve has a simple structure, small fluid resistance, larger flow capacity and no leakage than other types of valves of the same specification. It can be used to regulate media with high viscosity and suspended particles. The diaphragm isolates the medium from the upper cavity of the valve stem, so the medium will not leak without packing. However, due to the limitations of the diaphragm and lining materials, the pressure resistance and temperature resistance are poor, and it is generally only suitable for nominal pressures and temperatures below ℃.
Composition and working characteristics of diaphragm valve
Characteristics of diaphragm valve
The flow characteristic of diaphragm valve is close to the quick-opening characteristic, which is approximately linear before the stroke, and the flow rate does not change much afterward. Pneumatic diaphragm valves can also be equipped with feedback signals, limiters, positioners and other devices to meet the needs of automatic control, program control or flow adjustment. The feedback signal of the pneumatic diaphragm valve adopts contactless sensing technology. This product uses a membrane-type propelling cylinder instead of a piston cylinder, which eliminates the disadvantage that the piston ring is easily damaged, causing leakage and causing the valve to be unable to open and close. When the air source fails, the handwheel can still be operated to open and close the valve.
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