Swing Check Valve: Things to Know About It

The purpose of the swing check valve is to stop the medium in the pipeline from flowing backwards. The valve fully closes to stop backflow as soon as the pressure drops to zero. Swing check valves are a type of automatic valve that, to prevent mishaps, are typically employed in pipelines where the medium only flows in one direction. These kinds of valves have very minimal pressure dips and turbulence. This sort of valve should often be installed in the pipeline horizontally, but it may also be installed vertically as long as you keep in mind that the disc cannot reach the stalling position when the disc is caught in an open position. Let’s discuss more about the swing check valve more.

Working Principle of Swing Check Valves

The rocker swing mechanism used by the swing check valve is built-in. Except for the sealing gasket and sealing ring for the middle flange, all of the valve's opening and closing components are located inside the valve body, not penetrating it. As a result, there isn't a single point of leakage that might lead to valve leakage. The valve clack has a certain degree of freedom within a range of 360 degrees thanks to the swing arm connection's spherical connection structure, and there is suitable trace position compensation. The pressure at which the valve opens is referred to as the cracking pressure when the medium is flowing downstream and rushes through the valve flap. The valve closes automatically if the medium's pressure decreases below the cracking pressure. When the medium flows back, the force of the medium forces the valve flap and valve seat together, sealing the valve and closing the valve.

The Use of Swing Check Valves

Water, steam, oil, nitric acid, acetic acid, strong oxidising media, and urea are just a few of the different media that can be used with a swing check valve. Their primary applications are in the

pipelines for fertilizer, power, chemicals, pharmaceuticals, and petroleum. It works best with clean media and is ineffective with viscous, solid-particle-containing fluid.

It is not advised to use a swing check valve in situations when the medium flow is known to be low and pulsing. Due to this valve disc hitting the seat, the valve sustains significant damage, leading to wear on both discs, the possibility of the swing disc coming loose, and ultimately the valve ceasing to function as intended.

Care for a Swing Check Valve

The swing check valve doesn't need much upkeep. They are seen as lasting longer. However, they may become leaking if certain foreign objects were lodged between the disc and the seat, which would reduce the operation of the valve.

1. Simply keep the swing check valve clean by wiping off dust and grime regularly to prevent harm.

2. Consistently inspect the valve regularly. Look for any leaks.

If there is substantial leaking, replace the valve. Whether there are any signs of rust, corrosion, or wear. Verify the temperature and pressure of the fluid passing through the valve. Consistently keep the parameters inside the valve's range.

3. If the valve is changed, refurbish the old one and thoroughly wash every component with hydraulic fluid or the appropriate solvent. Check for dirt and dings. Examine the valve for wear, abrasive surfaces, and corrosion. Make it slick, lap it, and then reassemble it.

4. To prevent moisture, rain, and rust, the valve should always store oil in an area that is dry and well-ventilated.

5. When being transported or stored, the closing device should be in place with the opening and closing components inside.

• The position of the valve disc should be fixed as open.

• To avoid rust, keep the channels clean, and maintain the flatness of the end faces, the inner ports at both ends of the diameter are blocked with foam plates and must be tightly sealed with stuffed caps.

6. If left in one area for a long time, it should be examined frequently. Every three months, inspect the two channels' rust and dirt protection levels as well as those of the sealing surface and the welding connection. Repaint the anti-rust oil for protection after cleaning the rust and grime.

Final Words

Swing check valves are used, like all check valves, to prevent the pipe from flowing in the wrong direction. The valve opens by the fluid pressure that flows through a system; any flow reversal causes the valve to close. The swing check valve allows the flow forces to press the closure component; it is a hinged clapper that rotates or swings around a supporting shaft. When the upstream flow stops the disc swings back to the valve seat, allowing flow in the forward direction and preventing backflow. One of the most popular and effective types of check valves for general applications is the swing check design.

In comparison to other check valves of the same size, these valves have the lowest pressure drop, and their internal contours and shapes enable them to fully open at low fluid velocities and generate a smooth flow path through the valve. The design is straightforward, low-maintenance, and suitable for both horizontal and vertical pipe arrangements. (fluid flowing upward). As a

result, the swing check valve can be used in a variety of industries, including those related to power, fertilizer, chemicals, pharmaceuticals, and the oil and gas industry.

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