The check valve slides along the vertical centerline of […]
The check valve slides along the vertical centerline of the valve body. The butterfly check valve can only be installed on the horizontal pipe. On the high pressure small diameter check valve, the valve ball can be used. The butterfly check valve has the same valve body shape as the shut-off valve (common to the shut-off valve), so its fluid resistance coefficient is large.
Its structure is similar to the stop valve, the valve body and the valve flap are the same as the shut-off valve. The upper part of the valve flap and the lower part of the valve cover are machined with a guide sleeve, and the valve guide can be easily lifted and lowered in the valve guide guide.
When the medium is downstream, the valve flap is opened by the medium thrust. When the medium stops flowing, the valve flap is self-retained. The drooping falls on the valve seat to prevent the medium from flowing back.
The direction of the inlet and outlet passages of the straight-through butterfly check valve is perpendicular to the direction of the valve seat passage; the vertical lift check valve has the same direction of the medium inlet and outlet passages as the valve seat passage, and its flow resistance is smaller than that of the straight-through type.