Diaphragm valves

Diaphragm valve

A diaphragm valve consists of a valve body with two or more ports, a diaphragm and a "damper or seat" on which the diaphragm closes the valve. The valve body may be made of plastic, metal or other materials, depending on the application.

Rubber coated diaphragm valve

Originally, the diaphragm valve was developed for use in industrial applications. Later the design was adapted for use in the biopharmaceutical industry using materials that comply with regulations and are resistant to decontamination and sterilization methods.

There are two main categories of diaphragm valves: one type of seal over a "weir" (saddle) and the other (also called a "full bore" or "straight-way" valve) seal over a seat. The weir or saddle type is the most common in process applications and the saddle type is used more often in slurry applications to reduce blocking problems, but also exists as a process valve. Although the diaphragm valve is usually available in two ports (2/2-way diaphragm valve), they can also be supplied with three ports (3/2-way diaphragm valve, also called T-valve) and more (so-called block valves). When more than three ports are included, they generally require more than one diaphragm seat; however, special dual actuators can handle more ports with more than one diaphragm.


The diaphragm valves can be operated manually or automatically. Their application is generally as valves in process systems in the industrial, food and beverage, pharmaceutical and biotechnology industries. The older generation of these valves is not suitable for controlling and controlling process flows, but newer developments in this area have successfully addressed this problem.

In addition to the well-known two-way valve, there are other types of valves: triple dead space free diaphragm valve, sterile access gate, block and venting valve, fall arrest and tank bottom valve.

When installing a hygienic diaphragm valve, make sure that it is always installed in such a way that it deflates automatically.

Housing material:

  • Stainless steel
  • Steel
  • PVC-U,
  • PVC-C,
  • PP-H,
  • PVDF


  • Manual
  • Pneumatic