Diaphragm Valves working Principle

Diaphragm valves two types

  • Weir type Diaphragm

  • Straightway type diaphragm

Diaphragm valves (sometimes referred to as saunders valves) are designed to control flow in corrosive services where line content could adversely affect valve components. Other applications for diaphragm valves are in services where contamination from outside sources cannot be tolerated; for example, the pharmaceutical and food industries. Diaphragm valves differ from other valves in that the body of the valve and line content is sealed off from all moving parts of the valve by a flexible diaphragm. This flexible diaphragm seal prevents stem packing leakage of line content and flow contamination by packing lubricants. Even though there are many variations of diaphragm valve designs, most can be classified as either weir-type or straightway-type.

Weir type Diaphragm

Weir-type diaphragm valves are the most common type of diaphragm valve used.  shows a typical weir-type valve along with is major components.The weir-type diaphragm valve incorporates a raised section (weir) halfway through the valve, which acts as a closure point for the flexible diaphragm. Because of the way the weir is formed in the body, diaphragm movement is shortened, which in turn prolongs diaphragm life and reduces overall maintenance.

Straightway type diaphragm :-

Straightway-type diaphragm valves have no weir incorporated in the valve design. shows a typical straightway valve. This design gives the valve an uninterrupted passageway suited for flows which are viscous or contain solids.There are many types of diaphragm materials available, depending on service and temperature conditions.Because longer diaphragm movement is needed in the straightway-type valve compared to the weir-type, material selection is limited for the straightway-type valve.

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