A, swing check valve: swing check valve disc is a disc, revolving around the shaft of the valve seat channel for rotary movement, because the valve channel into streamline, flow resistance ratio
Drop check valve small, suitable for low flow velocity and flow not often change of large diameter occasions, but not for pulsating flow, its sealing performance is not as good as lifting type. Swing check valve is divided into single, double and half three types, these three forms are mainly divided according to the valve diameter, the purpose is to prevent the medium to stop flowing or reverse flow, weaken the hydraulic impact.
Two, lifting check valve: the valve disc along the vertical center line of the valve body slide check valve, lifting check valve can only be installed in the horizontal pipeline, in the high pressure small diameter check valve disc can be used in the ball. Lifting check valve body shape and globe valve – like and globe valve general, so its fluid resistance coefficient is larger. The structure is similar to the globe valve, and the valve body and disc are the same as the globe valve. The upper part of the valve disc and the lower part of the valve cover processing ring sleeve, the valve disc guide can be free to lift in the valve lamp guide, when the medium downstream, the valve disc by the medium thrust open, when the medium stop flow, the valve disc by vertical landing on the seat, prevent the medium countercurrent effect. Straight-through lifting check valve medium inlet and outlet channel direction and valve seat channel direction vertical; Vertical lift check valve, the quality of import and export channel direction and seat channel direction is the same, the flow resistance is smaller than straight-through.
Three, disc check valve: the check valve disc around the pin in the seat rotation. Disc check valve structure is simple, can only be installed in horizontal pipeline, poor sealing.
4. Pipe check valve: the valve disc slides along the center line of the valve body. Pipe check valve is a new valve, its small size, light weight, processing
Good technology, is the development direction of check valve -. But the fluid resistance coefficient is slightly larger than swing check valves.
Five, pressure check valve: this valve [] is used for boiler water supply and steam cutting valve, it has the comprehensive function of lifting check valve and globe valve or Angle valve.
In addition, there are some check valves that are not suitable for pump outlet installation, such as bottom valves, spring type, Y-type check valves.
Nortech is one of the leading industrial valve manufacturers in China with quality certification ISO9001.
Major products: Butterfly Valve, Ball Valve,Gate Valve, Check Valve, Globe Vavlve,Y-Strainers, Electric Acurator , Pneumatic Acurators .
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Post time: Feb-17-2022