Sanitary Diaphragm Valves - Overview, Operation, Working Principle & Technical Parameters

Sanitary diaphragm valves can be remotely controlled via a pneumatic actuator or manually operated with a handle. They are highly suitable for controlling pipeline fluids and performing on/off tasks. Widely used in hygienic food industries such as brewing, dairy products and beverages, as well as in sterile working conditions of the pharmaceutical field.

Working Principle of Sanitary Diaphragm Valves

The tight fit between the valve body and the diaphragm provides body sealing and seat sealing, ensuring complete isolation between the inside of the pipeline and the external environment. Therefore, this valve is suitable for sterile processes.

The opening and closing of the sanitary diaphragm valve are achieved by the up and down movement of the valve stem. When the valve stem is in the upper position, the spherical diaphragm bends upward, and the valve is in a conducting state. When the valve stem moves from top to bottom, it drives the valve core to bend the diaphragm, forcing the diaphragm to fit closely against the valve seat area and closing the flow path of the pipeline fluid.

This valve can be operated manually, pneumatically, or controlled by an intelligent controller.

Technical Parameters of Sanitary Diaphragm Valves

• Working Pressure: 0-10bar

• Working Temperature: -40-150℃

• Actuating Mechanism: Manual Control

• Sealing Material: EPDM, EPDM+TFM

• Valve Body Design: Straight-Through Valve Design

• Valve Body Material: 316L

• Interface Size: DN20-DN80

• Interface Type: SG-220-1: Welded Type; SG-220-2: Weld-Clamp Type; SG-220-3: Clamp Type

• Surface Treatment: External Surface Ra≤0.5μm (SF1); Internal Surface: Ra≤0.375μm (SF4)

• Interface Standard: ISO, DIN, ASME, BPE, 3A, BS