Swing Check Valve And Lift Check Valve

Swing check valve

The disc of the swing check valve is in the shape of a disc and rotates around the shaft of the valve seat channel. Because the channel in the valve is streamlined, the flow resistance is smaller than that of the lift check valve, and it is suitable for low flow rates and infrequent changes in flow. For large-diameter occasions, it is not suitable for pulsating flow, and its sealing performance is not as good as that of lifting type. The swing check valve is divided into three types: single-lobe type, double-lobe type and multi-lobe type. These three forms are mainly divided according to the valve diameter.

Lift check valve

A check valve in which the valve disc slides along the vertical centerline of the valve body. The lift check valve can only be installed on a horizontal pipeline, and a ball can be used for the valve disc on a high-pressure small-diameter check valve. The valve body shape of the lift check valve is the same as that of the globe valve (it can be used in common with the globe valve), so its fluid resistance coefficient is larger. Its 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 are machined with guide sleeves. The valve disc guide can be freely lifted and lowered in the valve guide. When the medium flows downstream, the valve disc is opened by the thrust of the medium. It falls vertically on the valve seat to prevent the reverse flow of the medium. The direction of the medium inlet and outlet channels of the straight-through lift check valve is perpendicular to the direction of the valve seat channel; the vertical lift check valve has the same direction of the medium inlet and outlet channels as the valve seat channel, and its flow resistance is smaller than that of the straight-through type. ,

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