Introduction:
Low -temperature stop valve refers to the valve that automatically opens and closed the valve petals by flowing by the media itself to prevent the medium reflux, also known as the inverse valve, one -way valve, reverse flow valve, and back pressure valve. The stopper valve is an automatic valve, which is the main function of preventing the medium backflow, preventing pumps and driving motor reversal, and leakage of container media. The stopper valve can also be used to the pressure on the pressure that is more than the auxiliary system that provides a supply system that exceeds the system pressure. The stop valve can be divided into a rotary stop valve (rotating according to heavy heart) and the lifting back valve (movement along the axis).
Structure and installation:
1. The valve petals of the low -temperature stop valve are disconnected. The rotation of the rotation of the valve seat channel is used to rotate. Because the inner channel of the valve is into a streamlined type, the flow resistance is smaller than the butterfly -type stoppage valve. It is suitable for low flow speed and flow. The large -caliber occasion of the change is not suitable for pulse flow, and its sealing performance is not as liter. The butterfly stop valve is divided into three types: single -petal, double -petal, and multi -type. These three forms are mainly divided according to the caliber of the valve. The purpose is to prevent the medium from stopping flow or backflow, weakening the impact of hydraulic power.
2. The low -temperature stop valve petals are sliding back to the valve of the vertical center line of the valve body. The inner thread stop valve can only be installed on the horizontal pipe. The valve petals on the valve on the high -pressure small caliber can use the ball. The shape of the butterfly stop valve is the same as the deeper valve (commonly used as the deeper valve), so its fluid resistance coefficient is large. Its structure is similar to the deeper valve, and the valve body and valve flap are the same as the deeper valve. The upper part of the valve petals and the lower part of the valve cover are processed with orientation. The valve petal orientation can be freely lifted freely in the valve orientation. When the medium flows smoothly, the valve petals are opened by the medium thrust. The vertical drop is dropped on the valve seat to prevent the aggressive effect of the medium. The direction of the direct butterfly stop valve medium inlet and export channels is vertical as the valve seat channel; the vertical lifting -down stop valve, the direction of the media inlet and export channels of the medium is the same as the valve seat channel direction, and its flow resistance is smaller.
3. Low temperature stop valve: The valve petals surround the spinning valve rotating around the valve seat. The plate -type stop valve structure is simple and can only be installed on the horizontal pipeline, which is better sealing.
4. Low temperature stop valve: valve petals slide valves along the center of the valve body. The pipeline stop valve is a new type of valve. Its size is small, the weight is light, and the processing process is good. It is one of the direction of the development of the return valve. However, the fluid resistance coefficient is slightly larger than the rotary -proof backlist.
5. Pressure -type stop valve: This valve is used as a boiler to cut off water and steam. It has a comprehensive function of lift -down stop valve and truncated valve or angle valve.
In addition, there is -stop valve that is not suitable for pump outlet installation, such as bottom valve, spring type, Y type and other stop valves.