Tag: Check Valves & Non return 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.

Types of Gate Valve and its Specifications

A gate valve is a linear motion valve that is used to start or stop the flow of the fluid in piping. There is a gate or wedge type disk which moves perpendicular to the flow which directs the flow to stop or start. In any process plant, the gate valve has the most common use and are suitable for both above-ground and underground installations. A gate valve is also known as a sluice valve. It is very easy to open it, one just have to lift the gate out of the path of the fluid. It does not require a wide surface; it fits in a very little space along the pipe axis. It requires a 360° surface contact between disk and seat to achieve proper sealing. A Gate valve is made up of certain parts that allow it to function properly. Valve’s body or shell is the most principal part of this particular valve which can connect inlet and outlet pipes in a piping system. Some other parts of a gate valve are as followed. Bonnet, Solid Wedge, Body seats, Stem, Back seat, Gland follower, Gland flange, Stem Nut, Yoke Nut, Handwheel, Hand wheel nut, Stud bolts, Nuts, Bonnet Gasket, Lubricator, Packing. All these parts allow the Gate & sluice valve to function properly.

Now let’s discuss the main types of gate valves.

 

1. Knife Valve   

Knife gate valves contain a very high quantity of suspended liquids. It is mainly used for on – off and isolation services in systems. Knife valves are the best suitable for working in some of the harshest environment. These valves should be used for the applications which require a completely open or completely closed position.

2. Brass Gate Valve   

Brass gate valves are the perfect fit for the applications where corrosion is a serious concern. It is considered as the most durable gate valve. It has a very high capacity to tolerate high temperatures as well as high pressure.

3. Slide Gate Valves 

The main purpose of the slide gate valve is to shut off the flow of product from discharge points such as dry bulk storage bins, silos, conveyors, etc. It is the best choice for industrial works.

4. Non-return Valves 

Non-return valve has considerable use in allowing the liquid as well as gas to flow in one direction. It is widely used in a huge variety of applications and household items.

5. Check Valves 

Check Valve has a very vast use in a variety of applications. It is also used in household items. Mostly check valve has two ports. One for fluid to enter and other for the fluid to leave. Check Valves & Non-return Valve are available in a variety of sizes and cost as well.

SKG Pneumatic Inc is one of the best gate valve suppliers and industrial suppliers as well. All our products are designed by skilled and expert engineers for resilient durability.