The structure and principle of stop valve

The stop valve is a particularly common cut-off valve. It is mainly used to connect or cut off the medium in the pipeline. It is generally not used to adjust the flow. The stop valve is suitable for a wide range of pressure and temperature, but is generally used for medium and small diameter pipelines.
Structural principle of stop valve:
1. The centers of the inlet and outlet of the stop valve are located on the same straight line. When the fluid flows, it looks like an S-shaped sphere, so it is also called a spherical stop valve;
2. When the valve seat of the valve stem is pressed down toward the bottom sealing surface, the medium stops flowing. When the valve stem rises, the medium passes through the flow channel from the bottom to the top.
There are generally directional requirements when installing stop valves. The flow direction of the medium in the pipeline generally flows from bottom to top through the valve seat port, which is often called low in and high out. The purpose of this is to reduce fluid resistance, save effort in opening and closing. The lower valve stem and packing culvert are not in contact with the medium to ensure that the valve stem and packing culvert are not damaged or leaked.