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Check Valve

E-mail:dkv@dkvchina.com

Whatsapp：+8613690635385

DKV VALVE

Your trustworthy Check Valve supplier

DKV VALVE provides high-quality check valve products. Since 1981, the DKV team has been developing and supplying check valves in China. DKV supplies swing check valves, lift check valves, butterfly check valves, and ball check valves. Please contact us for more information.

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DKV VALVE

What is a check valve?

We provide variety of check valves.

A check valve is also known as a non-return valve. Its main function is to allow the fluid (such as liquid or gas) to flow in only one direction. It automatically prevents the backflow of the fluid.

At DKV VALVE, we understand the importance of check valves in maintaining pipeline transportation. Our check valves have excellent designs and CE and ISO. When used efficiently, DKV provides quality assurance.

DKV VAVLE

check valve types

There are mainly four types of check valves： swing check valve, lift check valve, butterfly check valve, and ball check valve. Each type has its own structure and application scenarios, suiting different fluid systems and operating conditions to ensure the one-way flow of media.

  • Swing Check Valve
  • Lift Check Valve
  • Buterfly Check Valve
  • Ball Check Valve

Swing Check Valve

Lift Check Valve

Butterfly Check Valve

Ball Check Valve

Swing Check Valve

Structure: The valve disc of a swing check valve is disc – shaped and rotates around a pin outside the valve seat. It can be single – disc, double – disc or multi – disc. The body passage is streamlined.

Applicable Scenarios: Commonly used in pipelines of water supply and drainage systems, especially in medium – sized and large – sized pipelines.

Advantages: It has a relatively small flow resistance. The multi – disc structure for large – diameter pipes can reduce the impact force during closing.

Disadvantages: In some cases where the flow velocity changes rapidly or the medium contains a lot of impurities, the valve disc may not close tightly due to inertia or blockage, leading to backflow problems.

Lift Check Valve

Structure: There are two forms: straight – through and vertical. The valve disc moves up and down along the vertical centerline of the valve body (straight-through) or perpendicular to the inlet passage (vertical). The valve disc usually adopts a conical or flat – surface seal with the valve seat.

Applicable Scenarios: It is suitable for pipelines that require high – sealing performance for the medium, such as in the chemical industry for transporting corrosive liquids.

Advantages: Good sealing performance. It can effectively prevent the leakage of the medium, especially for media with strict requirements on non – leakage.

Disadvantages: The flow resistance is relatively large. The up – and – down movement of the valve disc may be affected by impurities in the medium, resulting in unsmooth operation or even valve jamming.

Lift Check Valve

Structure: There are two forms: straight – through and vertical. The valve disc moves up and down along the vertical centerline of the valve body (straight-through) or perpendicular to the inlet passage (vertical). The valve disc usually adopts a conical or flat – surface seal with the valve seat.

Applicable Scenarios: It is suitable for pipelines that require high – sealing performance for the medium, such as in the chemical industry for transporting corrosive liquids.

Advantages: Good sealing performance. It can effectively prevent the leakage of the medium, especially for media with strict requirements on non – leakage.

Disadvantages: The flow resistance is relatively large. The up – and – down movement of the valve disc may be affected by impurities in the medium, resulting in unsmooth operation or even valve jamming.

Butterfly Check Valve

Structure: The valve disc is disc – shaped and installed in the valve body through a short shaft. The valve body is generally circular, and the internal flow passage is smooth.

Applicable Scenarios: Widely used in large – diameter pipelines, such as ventilation systems and some low – pressure water – flow systems. For example, in air – conditioning duct systems.

Advantages: Compact structure, small space – occupation, light weight and easy installation. It also has a relatively low flow resistance and can adapt to high – flow – velocity media.

Disadvantages: The sealing performance may not be as good as that of lift check valves in some high – pressure or high – precision applications. When the medium contains solid particles, the valve disc may be damaged.

ball check valve

Ball Check Valve

Structure: The main part is a ball that moves freely in the valve body. The ball has a smooth surface and cooperates with the valve seat for sealing.

Applicable Scenarios: It is suitable for pipelines transporting media containing solid particles, such as slurry pipelines in mining and food – grade material pipelines.
Advantages: Simple structure and good sealing performance. It can handle media with solid impurities well and is not easily blocked.

Disadvantages: The size of the ball may limit the flow rate and pressure resistance to a certain extent. In high – pressure applications, the ball may cause excessive wear on the valve seat.

Ball Check Valve

Structure: The main part is a ball that moves freely in the valve body. The ball has a smooth surface and cooperates with the valve seat for sealing.

Applicable Scenarios: It is suitable for pipelines transporting media containing solid particles, such as slurry pipelines in mining and food – grade material pipelines.
Advantages: Simple structure and good sealing performance. It can handle media with solid impurities well and is not easily blocked.

Disadvantages: The size of the ball may limit the flow rate and pressure resistance to a certain extent. In high – pressure applications, the ball may cause excessive wear on the valve seat.

ball check valve

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how does a check valve work

Check valves mainly work by relying on the flowing force of the medium itself. Their purpose is to ensure that the medium flows in only one direction and prevent backflow. The following are the working principles of different types of check valves:

1

Working Principle of Swing Check Valves

  • Forward Flow
    When the medium flows in the predetermined normal direction, its flowing power acts on the disc of the swing check valve. The disc is a disc-shaped structure that rotates around a pin outside the valve seat.
    The pressure of the medium will push the disc away from the valve seat and open the valve. For example, in a water supply pipeline system, when water flows from the water source end to the water-consuming equipment end, the force of the water flow makes the disc open, and the water can smoothly pass through the valve and continue to flow in the pipeline.
  • Reverse Flow
    Once the medium stops flowing forward or there is a backflow situation, the disc will automatically rotate around the pin under the action of its own gravity and the force of the backflowing medium, and close towards the valve seat.
    For example, when the water pressure at the water-consuming equipment end suddenly becomes higher than that at the water source end (such as when the water pump suddenly stops working), the water has a tendency to flow back. At this time, the disc quickly closes under the pressure of gravity and the backflowing water, preventing the water from flowing back to the water source end, thus protecting the normal operation of the water supply system.
2

Working Principle of Lift Check Valves

  • Forward Flow
    For lift check valves, whether they are straight-through or vertical types, when the medium flows forward, the pressure of the medium will act on the disc. The disc is usually disc-shaped. Driven by the pressure of the medium, it will move upward along the vertical centerline of the valve body (for the straight-through type) or in the direction perpendicular to the inlet passage (for the vertical type) and leave the valve seat.
    For example, in a chemical liquid transportation pipeline, when the chemical liquid flows forward, the liquid pressure makes the disc rise, opens the valve, and the liquid can smoothly pass through the valve and continue to be transported in the pipeline.
  • Reverse Flow
    When the medium stops flowing or starts to flow backward, the disc will descend back onto the valve seat under the combined action of its own gravity and the pressure of the backflowing medium.
    Generally, a conical or flat surface seal is adopted between the disc and the valve seat. When the disc returns to the valve seat, a good sealing effect can be formed to prevent the medium from flowing backward. For example, when the chemical liquid transportation pump stops working and the liquid has a tendency to flow back, the disc descends to block the passage, preventing the liquid from flowing back and avoiding damage to the upstream equipment.
3

Working Principle of Butterfly Check Valves

  • Forward Flow
    The disc of a butterfly check valve is disc-shaped and is installed in the valve body through a short shaft. When the medium flows forward, the medium will push the disc to rotate around the short shaft and open the valve.
    Because the internal flow passage of its valve body is smooth and the fluid resistance is relatively small, the medium can pass through the valve relatively smoothly when flowing forward. For example, in a ventilation pipeline system, when the air flows forward, the air pushes the disc to open, and the ventilation can proceed normally.
  • Reverse Flow
    When the medium flows backward, the disc will rotate in the opposite direction under the action of the reverse medium until it closes the valve and prevents the medium from flowing backward.
    Just like in an air-conditioning duct system, if the air pressure in the duct changes in the reverse direction, the disc of the butterfly check valve will quickly rotate in the reverse direction, close the duct, and prevent the air from flowing backward, thus ensuring the normal operation of the air-conditioning system.
4

Working Principle of Ball Check Valves

  • Forward Flow
    The main component of a ball check valve is a ball. When the medium flows forward, the force of the medium will push the ball away from the valve seat and open the valve.
    The medium can smoothly flow through the passage between the ball and the valve body. For example, in some slurry transportation pipelines containing solid particles, when the slurry flows forward, the slurry pushes the ball away from the valve seat to ensure the normal transportation of the slurry.
  • Reverse Flow
    When the medium flows backward, the ball will roll towards the valve seat under the action of the backflowing medium and block the passage.
    Since the surface of the ball is smooth, a good sealing effect can be achieved in cooperation with the valve seat, thus preventing the medium from flowing backward. For example, in a mine tailings slurry transportation pipeline, when the tailings slurry transportation pump stops working, the ball will block the passage to prevent the tailings slurry from flowing backward and protect the upstream equipment.

DKV VALVE

Check valve connection method

Check valves have several connection types. Flange connection suits medium-large pipelines, providing strong joints and good sealing, but is costly and space-consuming. Threaded connection is for small pipes, simple yet with low pressure tolerance. Wafer connection is easy to install in medium-small pipes, but not for high pressure. Welding offers high strength and sealing for critical lines, though hard to disassemble. The choice depends on pipe size, pressure, and cost considerations.

  • Flange connection check valve

Usage: Use on large and medium pipelines DN50 and above, in oil and gas petrochemical sector usage.

Advantages: It’s strong and can withstand very high pressure and temperature. It is easy to service and provides excellent sealing.

Disadvantages: Expensive and requires large diameter flanges and bolts.

chack valve drawings
  • Threaded Connection check valve

Usage: Use on relatively smaller pipes below DN50- used in domestic system or plumbing system.

Advantages: Easy to use and does not take up much space.

Disadvantages: Threads can become weak and fractured under high pressures, and pressure conditions they are not strong enough.

check valve drawings
  • Wafer Connection check valve

Usage: Suitable for medium and slightly larger pipes between DN15 and DN300.

Advantages: Easy to use and does not take up much space.

Disadvantages: Not suitable for higher pressures and temperature conditions.

H77X check valve drawings
  • Welded Connection check valve

Usage: Used for very important and hazardous pipelines in the chemical and nuclear sectors.

Advantages: Very solid and sealed.

Disadvantages: Not easy to put on or take off, require professional-level welding.

Get In Touch
  • BaoLi Center T41601, Le Cong Town, Shunde District, Foshan City, Guangdong Province, China
  • +8613690635385
  • dkv@dkvchina.com
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