Non-return flap valves are mainly used in sewage water drains. The sewage non-return flap valves are used for offering effective protection to rainwater and sewage installations. which are vulnerable to flooding. The aim of using non-return flap valves is to allow the particular fluid to flow only in one direction. Do not try to compromise with the non-return flap valves’ quality. Reach out to one of the leading suppliers of non-return flap valves in the Middle East and GCC region. Remain with us to read this post and explore a lot more regarding non-return flap valves.

What are non-return flap valves?

The usage of non-return flap valves is to permit the flow of fluid only in a single direction. The fluid flow proceeds in the forward direction. When the respective fluid tries to flow in the backward direction, the non-return flap valves close. The closing and opening of non-return flap valves rely on the differential pressure between the outlet & inlet ports of non-return flap valves.

The manufacturers of these kinds of flap valves design them without actuators or handwheels as they automatically operate by permitting forward flow & block the fluid flow in the backward direction. It is very important to prevent the reverse flow of fluid as that also helps in the prevention of fluid contamination, especially in water & food applications. Non-return flap valves also avoid damage to boilers & pumps.

You can use flap valves in both high and low temperatures, corrosive & non-corrosive media. Remember that the application is dependent on the type of material used for constructing the valves’ internal parts. Contact the best provider of flapper valves in the UAE.

What are the different types of components of non-return flap valves?

These are the different types of vital components of non-return flap valves:

1. Body

The body is an outside part of non-return flap valves which are used for housing internal parts of non-return flap valves. The manufacturers of non-return flap valves design the body with sturdy materials such as steel, ductile iron etc. Most users prefer using ductile iron material for making the body of valves strong for withstanding fluid pressure. The high strength of the body also means making the non-return flap valves safe against the impact of high-temperature and falling objects.

2. Cover or Bonnet

Bonnet or cover is another part of flap valves that are placed on the body’s top part in order to protect the internal parts. The cover and body of non-return flap valves are linked through different elements like threads, bolts, and pressure seals. It helps in guaranteeing no leakage that may cause damage or even pressure loss to the environment. Both the cover & body are constructed of similar metallic material to boost high strength.

3. Disc

The disc is the vital component of non-return flap valves which are used for avoiding reverse fluid flow, The disc of such valves operates in springs’ support. Some manufacturers of flap valves don’t use springs.

4. Spring

Spring is used for supporting discs to close the flap valves after suction pressure lessens or when you turn off the pump.

5. Seat

The seat is another important component that is present inside the valves’ body for the prevention of leakage between the disc & body when non-return flap valves close. The seat offers the seating surface where the disc is present to prevent fluid’s reverse flow.

6. Gasket

A gasket helps in the prevention of fluid leakage. Gaskets are constructed of a variety of materials that determine the application area of non-return flap valves.

What is the working principle of non-return valves?

It depends on the difference in pressure of how the non-return flap valves will work. The non-return flap valves open when fluid pressure upstream outdoes the fluid pressure downstream. This pressure gives the force which acts on the non-return valves’ disc to move forward. So, a free space gets created. It permits fluid flow via flap valves. When you open the disc, the respective fluid remains moving in the forward direction. The disc closes the flap valves with a valve spring when there is a reduction in suction pressure or backflow.

What are the major applications of non-return flap valves?

• Non-return flap valves are used in wastewater treatment.
• They are used in the manufacturing process of different chemicals.
• These types of valves are also used in paper & pulp manufacturing plants.
• People use them in gas and oil refinery systems.
• Non-return flap valves can be used efficiently in steam power plants.

What are the benefits of using non-return flap valves?

• Non-return flap valves are completely free from leakage in the fluid.
• These valves do not permit the reverse flow of fluid.
• Non-return flap valves are highly efficient as the valve disc can cause a drop in low-pressure.
• They are versatile and can easily serve different media types.
• Non-return flap valves are quick-acting valves.


Hopefully, you have liked reading this post about non-return flap valves. Before making a selection of non-return valves, it is vital for you to consider a few factors – fluid velocity, operating temperature, media type etc. You can simply fit non-return flap valves and are hassle-free to maintain. Contact the number one supplier of flap valves in the UAE. Thanks for reading.



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