Tag: dual plate check valve

Uses of Check Valves & Non return Valves

Both check valves and non-return valves serve the same purpose, i.e., prevent the fluid from flowing back. Though they serve the same purpose, they are not the same. Let’s have a look at both of them in-depth. 

Check valves

A check valve is a mechanical device used in hydraulic systems to stop the flow of the fluid in one direction and allow free flow in the opposite direction. Unlike other valves, check valves do not require assistance to open and close. They even work if the plant loses electricity or air. Most common types of check valves are:

  • Swing type

    • Top hinged
    • Tilting disk

  • Lift type

    • Piston type
    • Ball-type

  • Dual Plate type

  • Stop Check valve

Non-return valves

A non-return valve is a mechanical device that is used to ensure that the fluid flows in the right direction, where pressure conditions might reverse the flow. Non-return valves are usually operated manually. Most common types of non-return valves are:

  • Spring-loaded non-return valves
  • Clapper type non-return valves

Difference b/w check valve & non-return valves

While many manufacturers consider check valves and non-return valves as the same thing, it is not actually the same. Check valves prevent backflow in defined circumstances, and it has to meet very strict criteria to ensure fluids are not able to siphon back into the systems. Whereas non-return valves need not meet the strict guidelines as check valves. 

Applications of check valve & non-return valves

Check valves and non-return valves are most commonly used in hydraulic systems and pumping stations. Other applications include:

  • Wastewater management
  • Portable water management
  • Irrigation
  • Mining 
  • Food and beverage
  • Oil and gas
  • Pharmaceutical
  • Power plant

Both check valves and non-return valves help:

  • Protect equipment downstream from backflow damage
  • Prevent contamination due to reverse flow
  • Prevent siphoning
  • Keep a vacuum seal

SKG Pneumatics INC is the leading industrial valve suppliers in India. No matter how big or small your requirement is, we can fulfill your order instantly. Explore our range of products to find what you are looking for.

Importance of Check Valves in Hydraulic Systems


A check valve is a mechanical device that is used to prevent backflow in a piping system. In other words, check valves obstruct the fluid flow in one direction and enables unobstructed flow in the opposite direction. The check valve is also commonly known as a non-return valve (NRV) or a one-way valve. 

Check valves have two openings in the body, one for the entry of the fluid and another for an exit. Check valves are largely used in household items, however, they also serve a great purpose in controlling the direction of fluid flow in hydraulic systems. Since there are too many check valve suppliers in India, you need to find the one who provides industrial quality check valves. 

What is a Hydraulic System?

Most industries require a controlled application of force and these operations are usually carried out using electrical or fuel-based machines as a prime mover. However, specially designed enclosed fluid systems can also provide controlled motion and force to the substances. These systems are capable of providing both linear as well as rotary motion and it also allows us to apply high magnitude controlled force. This kind of enclosed fluid-based system that uses pressurized incompressible liquids as transmission media is known as a hydraulic system.

What are Hydraulic Control Valves?

A hydraulic control valve is a device that has the capability to change the opening degree of the fluid flow path. Additionally, control valves are also used to regulate the speed of the fluid flow to the motors and cylinders.

Most common Hydraulic control valves types

  • Directional control valves
  • Pressure control valves
  • Flow control valves

These hydraulic valves can be controlled by manual, mechanical, hydraulic, electric, electro-hydraulic, pneumatic, and input control, on or off fluid flow channels. 

What is the importance of check valves in Hydraulic Systems?

Check valves serve a variety of purposes in hydraulic systems. It is important because: 

  • It blocks pressure spikes
  • Prevents oil lines from draining
  • Blocks oil flow from the accumulator
  • Prevents oil flow from the online pump to the offline pump

Check valves help you prevent backflow in a hydraulic system while control valves help you regulate the speed of the fluid flow in the hydraulic system. With all the different types of hydraulic valves, you need to choose the right one in order to get the job done. 

SKG Pneumatics INC is the top industrial valve suppliers in India. They not only supply check valves, but they also supply other types of industrial valves including control valves. If you’re looking for high resistant valves, then you’re at the right place. Contact us for more information.

Different Types of Check Valve and Its Applications


Check valves are designed to pass flow the fluid in one direction with minimal resistance and prevent reverse flow or damage to the passage. Check valves are the most important valves included in any system, whether household or industrial system. Different Check valve Types are designed for different applications.

How does Check valve work?

A check valve is constructed with a valve body, cover, and disc attached to a hinge and swings away from the valve seat to allow the flow of the fluid passing.

Types of Check Valves:

1. Swing Check Valve

The disc is unguided in a Swing Check Valve, when it moves to fully open position or to a fully closed position the fluid flows in a forward direction with minimal resistance. Many different discs and seat designs are made available by SKG Pneumatics to satisfy requirements of varying applications.

2. Ball Check Valves

Ball Check valves are constructed with a spherical ball inside the body which helps to control the flow of the fluid. The ball rotates freely when the fluid is passing by. This unique process makes it ideal for installing it for a viscous fluid.

3. Tilted Check Valves

A tilted check valve is designed with a disc which has a pivot point at the center of the disc. When the flow is streamed the disc open and when it turns to reverse the disc closes immediately. This Tilted Check valve is mostly used in agricultural areas.

4. Dual Disk Check Valve

A dual disk check valve is designed to control the flow of the fluid, the hinge is connected to a plate which rotates and the stream is controlled when the hinge is moved.

5. Silent Check Valve

This check valve availed by SKG Pneumatic are designed to eliminate water hammer and are recommended to use in multi-story buildings. It consists of a spring attached to the disc which slowly closes when the water flow decreases, eliminating the hammering.

6. Nozzle Check Valves

Nozzle check valves are designed to stream the flow of gas, fluid or slurry in low pressure. This check valve doesn’t allow reverse stream as it closes when low pressure is felt than actual.

SKG Pneumatics is the solution to your all piping system including also Industrial Valves. These are some non-return valve designed and supplied by SKG Pneumatics accompanied by Advance, Zoloto, NVR, etc to maintain the safety and better piping system.