It is quite a hard task to select the correct check valves for the applications, there are a huge number of criteria which you need to take care of at the time of consideration. There are different types of check valves available in the market for numerous applications. As there is not only one kind of check valve, the selection process has to be accurate. Never compromise the quality of any valves while buying them. Remain with us and read this blog to learn about different types of check valves and materials used.
What are check valves?
Check valves are those kinds of valves which are designed for permitting the fluid flow just only in one direction raising the disc by fluid pressure or interrupting the fluid flow in the reverse direction by lowering the disc automatically. Check valves are mechanical devices which are designed & constructed for easy and efficient controlling or interrupting the fluid flow in the pipeline by simply lowering, rotating or lowering the disc concerning the seating surface or even controlling the ball’s movement. So, the vital function of the check valve goes – to interrupt or control the fluid flow in your pipelines.
Check valves are a type of non-return valves and are also called reflux valves, one-way valves, retention valves, and foot valves. Check valves have two ports or openings in the valves’ body. One port of the check valve permits the fluid to set forth while the other port lets the fluid leave away. As the check valves permit fluid to flow unidirectionally, therefore check valves are also called one-way valves.
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What are the different types of check valves?
Check valves are used for various applications. Have a look at different kinds of check valves.
Swing check valves
Swing check valves are made from the disc that is hinged. The disc of the swing check valves opens while the inlet pressure is given. When inlet pressure gets dropped or fluid backflow happens, the disc swing shuts down. Swing check valves are used in those applications with high solid content or short off/on cycles.
Tilting disc check valves
Tilting disc check valves’ pivot point is located at the discs’ centre position to permit fluid flow over the disc’s bottom as well as the top portion. Tilting disc check valves are mostly used, in the areas where frequent fluid flow reversal is present. When the disc gets opened, the flow of the fluid keeps the disc open, unlike the swing check valves that are kept open through the velocity of a particular fluid flow.
Ball check valves
Ball check valves operate by using the free-floating ball resting on the seat very close to the orifice. When the pressure of the fluid on the inlet side increases the cracking pressure, the ball gets pushed from the seat by permitting the fluid flow to happen.
Diaphragm check valves
Diaphragm check valves are self-centring discs which act as the mechanism to avoid the reverse fluid flow. Usually, diaphragm material restricts the application of diaphragm check valves to fluids under 180 degrees and 16 bars.
Butterfly check valves
Butterfly check valves help in regulating the fluid flow by slowing, ceasing or starting the fluid flow. Butterfly check valves are less expensive and light in weight.
What are the materials used for making check valves?
Check valves are constructed of sturdy and durable materials which can withstand high pressures. The most common valves are made from bronze, PVC, stainless steel etc.
a) Brass – Check valves made from brass are best for applications which involve the usage of water, air etc. Brass check valves are quite less resistant to rust and heat as compared to stainless steel.
b) Stainless steel: Stainless steel check valves have good mechanical properties and corrosion-resistant properties.
c) PVC: The check valves made from PVC are majorly used in water management and irrigation systems. These valves are highly resistant to corrosive media including bases, acids and organic solvents.
d) Polypropylene: Check valves constructed of Polypropylene material are majorly used for water and other liquid food products. These types of check valves are resistant to oxidizing agents and concentrating solids.
So, we hope that you all have enjoyed reading this post about check valves. You can install these valves in a vertical or horizontal position. While choosing the right kind of check valve, you will need to keep some criteria in your mind and those are material compatibility with the respective fluid, line width, maximum pressure & cracking pressure needs etc. Get in touch with a reputed supplier of check valves.