What factors does the sealing performance of manual diaphragm valve depend on

Manual diaphragm valves are widely used in fluid control systems for their excellent sealing performance. Sealing performance is crucial to the normal operation of the valve and to preventing media leakage.

Diaphragm structure

The sealing performance of manual diaphragm valve comes from its special diaphragm structure. The diaphragm is a key component inside the valve and is usually made of flexible and elastic materials, such as rubber (including fluorine rubber, EPDM, etc.), polymers, etc. The diaphragm is installed in the valve body, separating the upstream and downstream parts of the valve body, and plays a key role in isolating and preventing fluid leakage.

Valve seat design

The valve seat of a manual diaphragm valve is usually made of materials that match the diaphragm to ensure an effective seal between the valve seat and the diaphragm when the valve is closed. This matching improves sealing performance and reduces the risk of leakage.

Handle or handwheel control

Manual diaphragm valves are manually operated via a handle or handwheel, allowing users to precisely control the opening and closing of the valve. This manually controlled feature helps ensure the valve seals tightly when needed, minimizing the potential for leaks.

Valve material selection

Valve material selection is critical to sealing performance. In some special industrial environments, it may be necessary to select materials with high corrosion resistance and high temperature tolerance to ensure that the valve can still maintain good sealing performance under various extreme conditions.

Effect of closing force

The closing force of a manual diaphragm valve refers to the force generated by the rotation of the handle or handwheel, which is used to keep the valve in a completely closed state. Appropriate closing force can ensure the sealing performance of the valve and prevent leakage caused by lax closing.

Sealing performance standards

Sealing performance is usually evaluated according to international standards, such as the ISO 5208 standard. This standard specifies the sealing performance test methods of valves, including air tightness and liquid tightness testing. Manual diaphragm valves should generally meet these standards to ensure that they can provide reliable sealing under different operating conditions.

Effects of temperature and pressure

The sealing performance of manual diaphragm valves may vary under different temperatures and pressures. Under high temperature or high pressure conditions, the selection and design of valve materials are more critical to ensure that the valve can maintain good sealing performance.

Application scenarios

The sealing performance of manual diaphragm valves makes them widely used in applications with extremely strict leakage requirements, such as laboratories, pharmaceuticals, food and beverages, semiconductor manufacturing, etc.