1. The valve flap of the high-pressure check valve is disc-shaped and rotates around the shaft of the valve seat passage. Because the valve passage is streamlined, the flow resistance is smaller than that of the butterfly check valve, which is suitable for low flow rate and flow. Large-caliber occasions that do not change often, but are not suitable for pulsating flow, and their sealing performance is not as good as lifting. The butterfly check valve is divided into three types: single-valve, double-valve and multi-half. These three forms are mainly divided according to the valve diameter. The purpose is to prevent the hydraulic shock from being weakened when the medium stops flowing or reverses.
2. The high-pressure check valve slides along the vertical centerline of the valve body. The internal thread 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.
3. High-pressure check valve: A check valve that rotates around the pin shaft in the valve seat. The disc type check valve has a simple structure and can only be installed on a horizontal pipe, and has good sealing performance.
4. High-pressure check valve: A valve whose valve flap slides along the center line of the valve body. Pipeline check valve is a new type of valve. It is small in size, light in weight and good in processability. It is one of the development directions of check valves. However, the fluid resistance coefficient is slightly larger than the swing check valve.
5. High-pressure check valve: This valve is used as a boiler feed water and steam shut-off valve. It has a comprehensive function of a lift check valve and a shut-off valve or an angle valve.
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