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Non-return valve
The Non-return check valve is comprised of a disc or flap that is the same size as the pipe's opening. This disc is suspended downwards in the flow's path. As the liquid flows in the forward direction, the fluid's pressure pushes the disc upwards, allowing the flow to pass through the valve. However, if the flow direction changes, the disc closes tightly against the valve's seat, preventing the fluid from returning to the pipe. In instances where flow is absent, the valve's closure is due to the weight of the flap.
The shut-off mechanism of a non-return check valve is influenced by the force of gravity acting on the disc and the presence of reverse flow. The pivot point of the valve's disc is positioned outside the disc's outer edge. As the hydraulic head increases, there is a higher likelihood of fluid flowing back through the valve before the disc can effectively seal off the flow. It's important to note that the content has been rearranged to ensure similarity while maintaining the original text's informational nature.
In order to completely shut off, a Non-return check valve's disc must move through a 90 degree arc to reach the valve seat. However, if there is no resistance to slow down the disc's downward motion, it can lead to slamming and causing water hammer. This can cause damage and can be encouraged by reverse flow. Therefore, it's important to ensure proper precautions are taken to prevent this from happening.
Non-return Check Valve Working Principle
The built-in rocker non-return structure is utilized by the non-return check valve. All the components responsible for opening and closing the valve are installed inside the valve body, except for the sealing gasket and sealing ring for the middle flange. This configuration eliminates any potential leakage points, ensuring a leak-free valve. The non-return arm connecting the non-return check valve and the valve clack is designed with a spherical connection structure. This allows for a certain degree of freedom of movement for the valve clack within a 360-degree range, providing appropriate positional compensation. When the medium flows downstream, it propels through the valve flap, causing the valve to open. The pressure at which the valve opens is known as the cracking pressure. If the pressure of the medium drops below the cracking pressure, the valve automatically shuts. When the medium flows back, the force of the medium seals the valve flap against the valve seat, resulting in a closed valve.
Application of Non-return Check Valve
The application of Non-return check valves is quite diverse as it can be used for a wide range of fluids including water, steam, oil, nitric acid, acetic acid, strong oxidizing media, and urea. These valves are popularly used in industries such as petroleum, chemical, pharmaceutical, fertilizer, power, and other pipeline applications. However, they are only compatible with clean fluids and are not recommended for fluids containing solid particles or high viscosity.
It is not advisable to use a Non-return check valve when the flow of the medium is known to be pulsating and low. This is because the valve disc will hit the seat, leading to significant damage and wear on both discs. In addition, the Non-return disc may become loose, resulting in improper functioning of the valve. Therefore, it is important to avoid the usage of this valve in such conditions.
Maintenance of Non-return Check Valve
The Non-return check valve is a low-maintenance valve that has a longer lifespan compared to other valves. Nevertheless, it is possible for the valve to experience leaks if any foreign particles get lodged between the disc and seat, causing a decline in its overall performance. Therefore, regular inspection of the valve is necessary to ensure that it functions optimally.
Regularly wiping off dust and dirt is a simple yet effective way to protect the Non-return check valve from potential damage. By ensuring the valve is kept clean, you can greatly reduce the risk of any harm befalling it.
Regular inspections of the valve should always be carried out in order to ensure its proper functioning.
• Check for any leakages.
• Replace the valve if there is heavy leakage.
• Look for any sign of corrosion, rust, and wear.
• Inspect the pressure and temperature of the fluid flowing through the valve.
• Ensure the parameters within the limit of the valve.
3. If the valve is replaced, clean up the removed valve by overhauling it, wash all the parts thoroughly with hydraulic liquid, or whatever medium it is used for. Check for debris and scratches. Check the valve for corrosion, wear, or and rough surface. Make it smooth, lap it, and assemble it back.
4. The valve should be always stored lubricated in a dry and ventilated room to prevent moisture, rain, and rust.
5. The opening and closing parts should be in the closing device during storage or transportation, and the following work should be done:
• The valve disc should be fixed in the open position.
• The inner ports at both ends of the diameter are blocked with foam plates, and the ports must be plugged tightly with stuffed caps to prevent dust and rust, keep the channels clean and the end faces flat.
6. It should be checked regularly when placed for a long time. Check the protection status of the dirt and rust on the two channels, the sealing surface, and the welding joint every three months. After wiping the dirt and rust, repaint the anti-rust oil for protection.
Installation and Uses of Non-return Check Valve
1. Rotary Kai type check valve is mounted vertically on a horizontal pipe, used when the ships are fully opened.
2. Rotary Kai type check valve should be installed on a priority level of Official Road, may be mounted in a vertical pipe bottom-up medium flow pipe.
3. The following work should be done before installation:
■ Remove the stuffy cover and foam plate at both ends of the valve cha
■ Peel off the grease paper on the surface of the valve disc to remove the grease on the surface of the valve disc.nnel, clean the inner cavity, and remove the grease.
■ Check the movement of the disc by pushing it away from the seat to make sure its free movement.
■ Check the valve ends for any burrs or edge which prevents it seal properly.
■ The valve must be installed in the direction of the flow arrow.
■ If the valve is installed in a vertical direction, th
■ If the valve is installed in a horizontal direction, the cover should be at the top.en the flow should be upwards.
4. When you install the flow of media must be limited, a clear medium flow.
5. The medium passing through the pipeline should not contain hard particles, so as not to damage the sealing surface.
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