The close fit between the valve body and diaphragm of Sanitary Diaphragm Valve provides valve body seal and valve seat seal, ensuring the absolute isolation between the inside and outside environment of the pipeline, so the sanitary diaphragm valve is suitable for aseptic process. The opening and closing of the sanitary diaphragm valve is achieved by the up and down movement of the valve stem. When the valve stem of the sanitary diaphragm valve is in the upper position, the spherical diaphragm bends upward to form a conductive state. When the valve stem moves from top to bottom, it drives the valve core to bend the diaphragm, forcing the diaphragm to be close to the valve seat area or, closing the path to the pipeline fluid. The sanitary diaphragm valve can be operated manually, pneumatically, or controlled by an intelligent controller. The sanitary diaphragm valve can be remotely operated by a pneumatic head or manually operated by a handle. The sanitary diaphragm valve is very suitable for the control and opening/closing tasks of pipeline fluids. The sanitary diaphragm valve is widely used in sanitary brewing, dairy products, beverages and other food industries as well as in the pharmaceutical field under aseptic conditions.
The sanitary diaphragm valve is a valve body and a valve cover with a flexible diaphragm or a combined diaphragm, and its closing part is a compression device connected to the diaphragm. The valve seat can be a weir shape or a pipe wall of a straight-through flow channel. The advantage of the sanitary 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 sanitary 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. The working temperature of the sanitary diaphragm valve is usually limited by the materials used for the diaphragm and the valve body lining, and its working temperature range is about -50 to 175°C.

The sanitary diaphragm valve has a simple structure and consists of only three main components: the valve body, the diaphragm and the valve head assembly. The valve is easy to disassemble and repair quickly, and the diaphragm can be replaced on site.
Precautions for installing sanitary diaphragm valves:
① Before installing the diaphragm valve, carefully check whether the operating conditions of the pipeline are consistent with the specified use range of the valve, and clean the inner cavity to prevent dirt from blocking or damaging the sealing parts.
② Do not apply grease or oil to the rubber lining layer and the rubber diaphragm surface to prevent rubber swelling and affect the service life of the diaphragm valve.
③ The handwheel or transmission mechanism is not allowed to be used for lifting, and collision is strictly prohibited.
④ When manually operating the diaphragm valve, do not use the auxiliary lever to prevent excessive torque from damaging the drive components or sealing parts.
⑤ The diaphragm valve should be stored in a dry and ventilated room. Stacking is strictly prohibited. The two end channels of the diaphragm valve in stock must be sealed, and the opening and closing parts should be in a slightly open state.