Check Valve Installation Method

1. Swing check valve
The disc of the swing check valve is disc-shaped 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. It is suitable for large diameter occasions, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lifting type. Swing check valves are divided into three types: single-disc type, double-disc type and multi-disc type. These three forms are mainly divided according to the valve diameter. The purpose is to prevent the medium from stopping the flow or backflow and weakening the hydraulic impact.
2. Lift check valve
A check valve whose valve disc slides along the vertical centerline of the valve body. The lift check valve can only be installed on horizontal pipelines. The valve disc can be made of round balls on high-pressure small-diameter check valves. 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 relatively large. 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 processed with guide sleeves. The valve disc guide sleeve can be freely raised and lowered in the valve guide sleeve. When the medium flows forward, the valve disc opens by the thrust of the medium. When the medium stops flowing, the valve disc opens by itself. Drop down 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 direction of the medium inlet and outlet channels of the vertical lift check valve is the same as the direction of the valve seat channel, and its flow resistance is smaller than that of the straight-through type.
3. Disc check valve
A check valve in which the disc rotates around a pin in the valve seat. The disc check valve has a simple structure and can only be installed on horizontal pipelines with poor sealing performance.
4. Pipeline check valve
A valve whose disc slides along the centerline of the valve body. Pipeline check valve is a new type of valve. It is small in size, light in weight and good in processing technology. It is one of the development directions of check valve. However, the fluid resistance coefficient is slightly larger than that of the swing check valve.
5. Compression check valve
This valve is used as a valve for boiler feed water and steam cut-off, and it has the comprehensive functions of lift check valve and stop valve or angle valve.
In addition, there are some check valves that are not suitable for pump outlet installation, such as bottom valve, spring type, Y type, etc.