A shut-off valve is a valve that moves the closed part (valve) along the center line of the seat. It is the most widely used valve. This type of valve is very suitable for cutting, adjusting and throttle, and also suitable for low and medium high pressure. Note: the flow of the cut-off valve is from top to bottom. When the valve is opened, the opening height of the valve is 25% to 30% of the nominal diameter. The flow rate has reached the maximum, indicating that the valve has reached full open position. It is directional when installing. The structure length of the cut-off valve is larger than the gate valve, and the fluid resistance is large, and the reliability of the seal is not strong in the long run. Classification according to the channel direction of the cut-off valve: 1) direct pass valve: it is one of the most widely used valves in industry. But the resistance is the most. 2) direct current stop valve: in a DC or Y stop valve, the flow path of the valve body and the main channel become a slant line, so the damage degree of the flow state is smaller than that of the conventional stop valve, so the pressure loss through the valve is also smaller. More than a fluid containing a solid particle or a large viscosity. 3) angle cut-off valve: in the angle type cut-off valve, the fluid only needs to change one direction so that the pressure drop through the valve is smaller than the conventional cut-off valve. The application of Xiaotong in forging, valve diameter, high pressure. 4) plunger cut-off valve: this type of cut-off valve is the variant of the conventional cut-off valve. The valve is mainly used for “open” or “shut”, but with a special type of plunger or special ring, it can also be used to adjust the flow.
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