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Check Valve Installation
May 24, 2017

One, swing check valve: Swing Check valve disc is disk-shaped, rotate the rotating shaft around the seat passage, because the inner channel of the valve is streamlined, the flow resistance is smaller than the lift type check valve, suitable for the low flow rate and the large aperture of the flow, but it is not suitable for pulsating flow, its sealing performance is less than the lifting type. Rotary check valve divided into single, double and most of the three kinds, these three forms are mainly divided by the valve caliber, in order to prevent the media to stop flowing or backflow, weaken the hydraulic impact.

Second, lift check valve: The valve flap along the valve body vertical centerline sliding check valve, lift check valve can only be installed on the horizontal pipe, in the high-pressure small-caliber check valve on the disc can be used in the ball. The valve body shape of the lift check valve is the same as the cut-off valve (which can be used with the globe valve), 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 disc and the lower part of the bonnet are machined with a guide sleeve. Disc-guided simple in the valve guide to the free Take-off and landing, when the media downstream, the disc by the media thrust, when the media stop, the disc from the vertical landing on the seat, to prevent the media countercurrent. Straight-through type lift check valve medium inlet and outlet channel direction is perpendicular to the seat channel direction; vertical lift type check valve, its medium import and export channel direction is same with the valve seat channel direction, its flow resistance is smaller than the straight-through type.