Check valve and check valve, check valve, is a kind of used to prevent the reverse flow of medium in the pipeline, valve belong to automatic valve class, because when the pump stop running in, media will put back the clock, as if there is no check valve installation, will be in the reflow process middle water hammer effect, have damage on the pipes and pumps. Check valve according to the structural form can be divided into the lift check valve, spiral type check valve, butterfly check valve, mute vertical check valve, check valve, slow close check valve, etc. , lift check valve and rotary type check valves are generally flange connection, and butterfly check valve of the wafer, mostly vertical check valve is axial movement, slow close check valve using occasions, do not allow the check valve closure quickly, because that would make a big water hammer, the damage of equipment. Another silent check Industrial Valves, and used in the pump at the bottom of the bottom valve, the basic functions are the same. Check valves are commonly used materials such as cast iron, carbon steel, stainless steel, pressure from 1. 6 mpa to 25 mpa, applicable temperature from - 40 ℃ to 550 ℃, choose suitable non-return valve according to actual working condition. Here briefly lift check valve, spiral type check valve, butterfly check valve, mute vertical check valve, check valve, slow close check valve principle features: lift check valve flow refers to rely on the media itself, and automatic opening and closing valve, used to prevent the backflow medium valve, also known as the non-return valve, check valve, flow valve, and back pressure valve. Check valve belongs to a kind of automatic valve, its main role is to prevent the backflow medium, to prevent the pump and drive motor reversal, and the discharge of the container medium. Check valve can also be used to give the pressure could rise to more than the system pressure of the secondary system supply piping. Check the main can be divided into swing check valve ( In accordance with the center of gravity rotating) And lift check valve ( Move along the axis) 。 Lift check valve: disc along the vertical centerline of sliding body check, internal thread check valve can only be installed in horizontal pipe runs with the high pressure small check valve disc can be used on the ball. Swing check valves are also called or a one-way valve, its role is to prevent the backflow medium pipeline. Open-close part by medium flow and power to open or closed, to prevent the backflow medium valve check valve. Check valve belong to automatic valve class, mainly for the one-way flow of medium pipeline, only allowed to medium flows in one direction, in order to prevent accidents. This valve shall generally be installed in the pipeline. Swing check valves within the adoption of the rocker arm swing structure, all the opening and closing of the valve is mounted on the body, not through the body, in addition to the flange parts with sealing gasket and seal ring, the whole not funnelled outside, put an end to the valve leakage. Swing check valve rocker arm and the disc joint adopts spherical connection structure, make the disc range with a certain degree of freedom in 360 degrees, trace position with proper compensation. Butterfly check valve flow refers to rely on the media itself, and automatically open and close the disc, the valve is used to prevent the backflow medium, also called the non-return valve, check valve, flow valve, and the back pressure valve. Check valve belongs to a kind of automatic valve, its main role is to prevent the backflow medium, to prevent the pump and drive motor reversal, and the discharge of the container medium, butterfly check valve ( Along the center rotation) Butterfly check valve's role is only allowed to medium flows in one direction, the direction and stop the flow. This valve is normally automatic work, in a direction of flow of fluid pressure and valve opening; In the opposite direction of fluid flow, the fluid pressure since the overlap of the disc and the disc on the seat, thereby cutting off flow. Vertical check valve: due to the pressure of the inlet medium in the pipeline, and to overcome the spring resistance make the valve opened or closed. When the inlet pressure of medium below the outlet, the spring into the valve core seat and make the valve closed, stop medium counter-current, start-stop function back. This type of valve's role is only allowed to medium flows in one direction, the direction and stop the flow. This valve is normally automatic work, in a direction of flow of fluid pressure and valve opening; In the opposite direction of fluid flow, the fluid pressure since the overlap of the disc and the disc on the seat, thereby cutting off flow. Vertical check valve can only be installed in vertical pipe runs. Silent check valve disc along the vertical centerline of sliding body check, internal thread check valve can only be installed in horizontal pipe runs with the high pressure small check valve disc can be used on the ball. Butterfly check valve body shape and cut-off valve ( To stop valve general) Fluid resistance coefficient is larger, so it. Its structure is similar to cut-off valve, valve body and disc is the same as the cut-off valve. Disc upper part and lower part of the cover processing has a guide sleeve, Jane Jane disc guide can be freely within the valve light guide Jane, when the downstream of the medium, the disc by medium thrust open, when stop the flow of medium, the disc landing on the hanging on the seat, to prevent medium counter-current role. Straight-through butterfly check valve medium import and export channel direction and seat vertical direction; Vertical lift check valve, import and export of its media channel direction and seat in the same direction, its a straight-through flow resistance is small. Slow close check valve opening and closing by medium flow and power to open or close, to prevent the backflow medium valve. Slow close check valve is installed in the high-rise building water supply system and other water supply system of the pump outlet, prevent the backflow medium, water hammer and the intelligent valve water hammer phenomenon. The Industrial Valves with electric valve, check valve and water hammer eliminator three kinds of function, can effectively improve the safety and reliability of water supply system, and will slowly open, quick closing, slowly-closing eliminate water hammer principle of technology integration, to prevent pumping water hammer and water hammer pump is going to produce. Just water pump motor open/close button operation, the valve can be according to the water pump operating rules automatically opening and closing, large flow, small pressure loss.
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