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Silent type check valve structure and installation method
Mute-type check valve is to rely on the flow of the media itself and automatically open and close the valve flap, used to prevent the media back to the valve, also known as check valve, check valve, counterflow valve, and back pressure valve. Check valve is an automatic valve, its main role is to prevent media backflow, to prevent the pump and drive motor reversal, and the release of container media. Check valves can also be used on lines where the pressure may rise above the system pressure on the auxiliary system. Check valve can be divided into spin-check valve (according to the center of gravity rotation) and the lift check valve (along the axis of movement). The purpose of this type of valve is to allow only the medium to flow in one direction and to prevent the flow in the direction. Usually this kind of valve is automatic working, the valve flap opens under the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the valve flap is acted upon by the fluid pressure and the self-weight of the valve flap to cut off the flow. Silent check valve disc is disc-shaped, around the valve seat for rotation shaft rotation, because of the valve into the streamline linear flow resistance than the butterfly check valve, suitable for low flow rate and flow is not Often changes in the occasion of large-caliber, but not for pulsatile flow, the sealing performance is less than lift. Butterfly check valve single-valve, double-valve and most of the three, these three forms are mainly based on the valve caliber, the purpose is to prevent the media stop flowing or backwards, weakened the hydraulic impact. Silent check valve flap along the valve body vertical centerline sliding check valve, the female check valve can only be installed in the horizontal pipe, the valve can be used in the high pressure small-diameter check valve ball. Butterfly check valve body shape and the same cut-off valve (common with the cut-off valve), so it has a larger fluid resistance coefficient. Its structure is similar to the cut-off valve, the valve body and the valve and the cut-off valve the same. The upper part of the valve plate and the lower part of the valve cover are machined with a guide sleeve which is simple and can be freely guided and guided by the valve guide. When the medium flows downstream, the valve plate is opened by the medium thrust. When the medium is stopped, Drop falling on the valve seat, play a role in blocking the media countercurrent. Straight through butterfly check valve medium inlet and outlet channel direction and seat channel vertical; vertical lifting check valve, the media import and export channel direction and valve seat channel in the same direction, the flow resistance than the straight-through small.