Wafer check valves are also called reverse flow valves, check valves, back pressure valves, and check valves. This type of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which belongs to an automatic valve.
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Wafer check valve:
1. Water hammer pressure: very small, short flap travel, light flap, and spring-assisted closing, closing speed is very fast;
2. The structural length is very short, the volume is small, and the weight is very light, which brings great convenience to the installation, handling, storage and piping layout of the valve, and can save a lot of materials and reduce the cost;
3. The fluid resistance is large, the coefficient is &6.4-2.8;
4. Installation method: horizontal installation or vertical installation, light weight and easy installation;
5. The opening pressure is small, the valve flap can be fully opened under a small pressure difference;
6. The valve has an overall structure, which is simple and compact, with little impact force when the valve is closed, little water hammer pressure, long valve life and high reliability.
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Wafer check valves are also called reverse flow valves, check valves, back pressure valves, and check valves. This type of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which belongs to an automatic valve.
use
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Check valves are used in pipeline systems. Their main functions are to prevent backflow of the medium, to prevent the pump and its drive motor from reversing, and to release the medium in the container. The check valve can also be used to replenish the auxiliary system where the pressure may rise above the pressure of the main system. Depending on the material, the check valve can be applied to pipelines of various media. The check valve is installed on the pipeline, that is, it becomes one of the fluid components of this complete pipeline, and the valve flap opening and closing process is affected by the transient flow state of the system in which it is located; in turn, the closing characteristics of the valve flap Has an effect on the fluid flow state.
Working characteristics
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The working characteristics of the check valve are that the load changes greatly, and the frequency of opening and closing is small. Once the switch is turned on and off, the applicable period is very long, and the moving parts are not required to move. However, once the "switching" requirement is made, it must be flexible, which is more demanding than the common mechanical movements. Since the check valve is qualitatively determined for rapid closing in most practical applications, the medium flows directionally at the moment when the check valve closes. With the closing of the valve flap, the medium quickly drops from the maximum backflow speed to zero And the pressure rises rapidly, that is, the phenomenon of "water hammer" that may have a destructive effect on the pipeline system. For the high-pressure pipeline system applicable to multiple pumps in parallel, the water hammer problem of the check valve is more prominent. Water hammer is a kind of pressure wave in the transient flow in the pressure pipe. It is a hydraulic shock phenomenon of pressure rise or fall caused by the change of the fluid flow rate in the pressure pipe. The physical cause is the combined effect of fluid incompressibility, fluid motion inertia and pipeline elasticity. In order to prevent the hidden danger of water hammer in pipelines, people have adopted some new structures and new materials in the design of check valves for many years. While ensuring the applicable performance of check valves, the impact force of water hammer is minimized. Has made gratifying progress. The check valve refers to the valve that automatically opens and closes the flap by relying on the flow of the medium itself. The main function of the valve to prevent backflow of the medium is to prevent backflow of the medium, prevent reverse rotation of the moving motor, and discharge the container medium. Check valves can also be used to replenish auxiliary piping where the pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
working principle
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The role of this type of valve is to only allow the medium to flow in one direction, but also prevent the direction of flow. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the self-coincidence of the fluid pressure and the valve flap acts on the valve seat, thereby cutting off the flow. The wafer type check valve belongs to this type of valve, which includes a swing check valve and a lift check valve. The swing check valve has a hinge mechanism, and a flap like a door freely rests on the inclined valve seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface every time, the valve flap is designed in a hinge mechanism, so that the valve flap has enough unscrewed space, and the valve flap is truly and fully contacted with the valve seat. The valve flap can be made entirely of metal, or it can be inlaid with leather, rubber, or a synthetic cover, depending on the performance requirements. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve seat of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve flap can freely move up and down, the rest of the valve is like a shut-off valve. The fluid pressure lifts the valve flap from the sealing surface of the valve seat. The medium backflow causes the valve flap to fall back to the valve seat and cut off the flow. According to the conditions of use, the valve flap can be an all-metal structure, or in the form of a rubber pad or rubber ring inlaid on the valve flap holder. Like the shut-off valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow of the swing check valve is restricted. Very little.
Technical Parameters
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Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K Nominal diameter or caliber: DN15～900, NPS 1/4～36 Connection method: flange, butt welding, thread, bearing Applicable temperature for plug welding: -196℃～540℃ Valve body materials: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Choose different materials, can be applied to various media such as water vapor, oil, nitric acid, acetic acid, oxidizing medium, urea and so on.