The diaphragm structure of manual diaphragm valve

The diaphragm structure of a manual diaphragm valve is one of the key designs of the valve, which directly affects its sealing performance and applicability. The following is a professional detailed explanation of the diaphragm structure of a manual diaphragm valve:

material selection

The diaphragm of a manual diaphragm valve is usually made of soft, elastic material to ensure that it can deform during operation and remain elastic, while also being corrosion and wear-resistant. Common diaphragm materials include:

  Rubber: Including fluorine rubber (FPM), chloroprene rubber (CR), ethylene propylene rubber (EPDM), etc., which has good elasticity and corrosion resistance.

Polymer: Such as polytetrafluoroethylene (PTFE), polyethylene, etc., providing excellent chemical resistance and high temperature resistance.

structure type

The diaphragm structure of a manual diaphragm valve is usually flat, round or square, and is accurately installed in the diaphragm chamber of the valve body. A seal is formed between the outer edge of the diaphragm and the valve body to ensure that the medium cannot leak. Specific structural forms include:

Flat Diaphragm: The simplest structural form, the diaphragm is flat and suitable for some applications under low pressure or normal pressure conditions.

Spherical Diaphragm: The diaphragm is spherical in shape and can adapt to greater deformation. It is suitable for some scenarios where high pressure or a larger flow cross-section is required.

stretch and compression

Manual diaphragm valves are usually operated through a handle or handwheel, causing the diaphragm to undergo tensile or compressive deformation, thereby changing the state of the valve. This deformation is achieved through the design of the valve body cavity, ensuring that the diaphragm can achieve the required deformation without being damaged during operation.

Valve seat design

The cooperation between the diaphragm and the valve seat in the valve body is the key to ensuring sealing performance. The valve seat is usually made of a material that is compatible with the diaphragm to ensure an effective seal when the valve is closed.

Connection to handle or handwheel

The handle or handwheel is connected to the diaphragm through a mechanical connection. By rotating the handle or handwheel, the user can change the state of the diaphragm and thereby adjust the flux of the valve. The design of the joint should ensure smooth deformation during operation and ensure the reliability of the connection.

Replacement

Considering that the diaphragm may be damaged due to service life, media corrosion, etc., the design of manual diaphragm valves usually takes into account the replaceability of the diaphragm. In this way, users can easily replace the diaphragm and extend the service life of the valve.