Sealing Principle of Diaphragm Valves
Release Date:
2023-02-15
The sealing principle of a diaphragm valve is that the downward movement of the actuator presses the diaphragm or diaphragm assembly against the channel in either a weir-type lined valve body or a straight-through lined valve body, thereby achieving a seal. The magnitude of the sealing specific pressure is determined by the downward force applied by the closing member. Because the valve body can be lined with various soft materials, such as rubber or polytetrafluoroethylene, and the diaphragm is also made of soft materials—such as rubber or PTFE-lined synthetic rubber—a relatively small sealing force is sufficient to achieve a complete seal.
The sealing principle of a diaphragm valve relies on the downward movement of the actuator, which presses the diaphragm or diaphragm assembly against the channel in either a weir-type lined valve body or a straight-through lined valve body, thereby achieving a tight seal. The magnitude of the sealing specific pressure is determined by the downward force applied by the closing member. Because the valve body can be lined with various soft materials, such as rubber or polytetrafluoroethylene, and the diaphragm is also made of soft materials—such as rubber or PTFE-lined synthetic rubber—a relatively small sealing force is sufficient to achieve a complete seal.
A diaphragm valve consists of only three major components: the valve body, the diaphragm, and the bonnet assembly. The diaphragm separates the lower cavity of the valve body from the upper cavity of the bonnet, ensuring that the stem, stem nut, valve disc, pneumatic actuator, electric actuator, and other components located above the diaphragm remain completely isolated from the process fluid and are protected from external leakage, thereby eliminating the need for a stuffing box sealing arrangement.
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