Installation method of forged steel check valve

1. The disc of the wafer butterfly check valve is in the shape of a disc, which 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 butterfly check valve. It is suitable for large-diameter occasions with low flow rate and infrequent flow changes, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lifting type. Butterfly check valves are divided into three types: single-disc type, double-disc type and multi-half type. These three types are mainly divided according to the caliber of the valve. The purpose is to prevent the hydraulic impact when the medium stops flowing or reverses.
2. The butterfly type forged steel check valve disc slides along the vertical center line of the valve body. The internal thread check valve can only be installed on the horizontal pipeline. The disc can be used on the high pressure small diameter check valve. round ball. The body shape of the butterfly 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 bonnet are processed with guide sleeves. The guide sleeve of the valve disc can be lifted and lowered freely in the guide plate of the valve cup. When the medium flows downstream, the valve disc is opened by the thrust of the medium. 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 butterfly 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 that of the valve seat channel, and its flow resistance is smaller than that of the straight-through type.
3. Forged steel check valve: a check valve in which the disc rotates around the pin shaft in the valve seat. The disc check valve has a simple structure and can only be installed on horizontal pipelines with good sealing performance.
4. Wafer butterfly type forged steel check valve: a valve in which the 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 the development direction 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 boiler feed water and steam cut-off valve. 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 and other check valves.