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Introduction to What is the diaphragmatic valve

Basically, the diaphragm valve has the same function as other types of valves, namely to regulate the flow of fluid or gas in an industrial piping system, but this diaphragm-type valve has advantages, including a calm flow and the fluid will flow without obstacles.

Pengenalan Apa Itu Diaghpragm Valve
Diaghpragm Valve

This type of valve is very good for flow control and very tight closing, even if the pipeline contains suspended solids. Diaphragm valves are suitable for corrosive fluids, fibrous materials, viscous materials, sludge, suspended solids, gas, and compressed air.

Actuators for diaphragm valve

The diagonal valve can be controlled by different types of actuators such as manual, pneumatic, hydraulic, electric, etc.

In general, the type of pneumatic actuator that is most widely used in the use of the diagonal valve because it is faster and more efficient than the use of hydraulics or electrics. However, manual operation and hydraulics are still widely used, especially in industrial process systems that do not require speed for open-close (open-close).

Type of diagonal valve (diaphragm valve)


The main structure of the elements of the valve diaphragm is the body, the cap (chimney cover) and the flexible diaphragm. The diaphragm valve is easily recognizable in its convex shape just below the handle.

The main applications of valve membranes involve low pressure and slurry operations.

In general, there are two types of diaphragm valve, namely:

  • Straight diaphragm valve
  • Weir-type diaphragm valves

1). "Straight-through" type

Apa Itu Diaghpragm Valve
Gambar-detail-diaphragm valve-type-straightway
Gambar detail diaghpragm valve - straightway type

The direct passage type has the same internal diameter and the same shape as a duct. To operate this type of valve, a long stroke is required.

2). "Weir" type (dam)

Pengenalan Apa Itu Diaghpragm Valve
Gambar detail diaghpragm valve - weir type

Weir-type valves or dams are very good for throttling and sealing. To operate this type of valve, a short stroke is sufficient.

The diaphragm valve stem does not rotate. The diaphragm moves up and down using compression of the piston which, in other turns, is driven by a lever arm or a rod operation. Usually, this valve does not have an envelope or a veil, which facilitates selection. However, for hazardous chemicals, the caps are supplied and sealed with Teflon or another packaging.



The diaphragm valve is made from materials which include: cast iron, soft iron, mild steel, stainless steel and a mixture of corrosion-resistant materials.


Advantages of the diaphragm valve (membrane valve)

Here are some of the different benefits of a diaphragm valve (diaphragm valve):


1 It can be used as an all-or-nothing service valve.

2 Resistant to chemicals because several layers are available.

3 Rod leakage can be eliminated.

4 Provides bubble-tight services.

5 It does not have a sediment trap bag, so it is suitable for mud and viscous liquids.

6 This valve is ideal for hazardous chemicals and radioactive liquids.

7 These valves do not allow contamination of fluids, so they are widely used in food processing, pharmaceuticals, brewing and other applications that do not tolerate contamination.

Diaghpragm valve (diaphragm valve) deficiencies


1 weir (weir) can prevent complete drainage on the pipe.

2 The working temperature and pressure are limited by the material of the membrane. Generally, the pressure is limited to 200 psi (1380 kPa) and the temperature to 400 F (204 C).

Diaphragms can also limit hydrostatic pressure.

4 Diaphragms can be eroded when widely used in throttling services that contain a lot of impurities.

5 Diaphragm valves are available in limited sizes, generally NPS 1/2 to 12 (DN 15 to 300).

A typical application of diaphragm valves


1 Clean or dirty water and air applications

2 Demineralized water system

3 Corrosive application

4 Radioactive waste systems in nuclear installations

5 Vacuum service

6 Food, pharmaceutical and brewing systems

So, an explanation from Diaghpragm Valve. If this article is useful, share it.

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