Forged steel check valve refers to a valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. Forged steel check valve is an automatic valve, its main function is to prevent the backflow of the medium, prevent the reverse rotation of the pump and the driving motor, and discharge the medium in the container. Forged steel check valves can also be used on lines supplying auxiliary systems where the pressure may rise above the system pressure. Forged steel check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Installation method of forged steel check valve
1. The disc of the butterfly type forged steel check valve is disc-shaped and rotates around the shaft of the valve seat passage. Because the passage in the valve is streamlined, the flow resistance is smaller than that of the rising butterfly check valve. It is suitable for It is suitable for large-diameter occasions with low flow rate and infrequent changes in flow, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of lifting type. Butterfly check valve is divided into three types: single-lobe type, double-lobe type and multi-half type. These three forms are mainly divided according to the diameter of the valve.
2. Wafer butterfly check valve disc is a check valve that slides along the vertical centerline of the valve body. The check valve with internal thread can only be installed on the horizontal pipeline. The disc can be used on the high-pressure small-diameter check valve. ball. The shape of the valve body 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 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 butterfly 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.
3. Forged steel check valve: a check valve in which the disc rotates around the pin 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 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 kind of valve is used as a valve for boiler feed water and steam cut-off. It has the comprehensive function of lift check valve and globe 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.
