What Are The Applicable Occasions And Characteristics Of Diaphragm Valves?

Lined Diaphragm Valve Applicable occasions:

Diaphragm valve is a special form of shut-off valve. Its opening and closing parts are a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover.

Due to the limitations of the valve body lining process and the diaphragm manufacturing process, it is difficult to manufacture larger valve body linings and larger diaphragms. Therefore, diaphragm valves are not suitable for larger pipe diameters and are generally used in pipelines below DN200.

Due to the limitations of diaphragm materials, diaphragm valves are suitable for low pressure and low temperature occasions. Generally, it should not exceed 180℃. Since diaphragm valves have good corrosion resistance, they are generally used in devices and pipelines with corrosive media. Since the operating temperature of diaphragm valves is limited by the diaphragm valve body lining material and diaphragm material.

Characteristics of diaphragm valves:

(1) Low fluid resistance.

(2) Can be used for media containing hard suspended matter; since the medium only contacts the valve body and diaphragm, no stuffing box is required, there is no stuffing box leakage problem, and there is no possibility of corrosion to the valve stem.

(3) Suitable for corrosive, viscous, and slurry media.

(4) Cannot be used in high pressure situations.

The diaphragm valve is a valve body and a valve cover with a flexible diaphragm or a combined diaphragm installed in it, and its closing member is a compression device connected to the diaphragm. The valve seat can be a weir-shaped or a pipe wall of a straight-through flow channel. The advantage of the diaphragm valve is that its operating mechanism is separated from the medium passage, which not only ensures the purity of the working medium, but also prevents the possibility of the medium in the pipeline impacting the working parts of the operating mechanism. In addition, no separate seal is required at the valve stem unless it is used as a safety facility in controlling harmful media. In the diaphragm valve, since the working medium contacts only the diaphragm and the valve body, both of which can be made of a variety of different materials, the valve can ideally control a variety of working media, especially for media with chemical corrosiveness or suspended particles.