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The stop valve, also known as the cut-off valve, is a forced-sealing valve and a kind of cut-off valve. According to the connection mode, it is divided into three types: flange connection, threaded connection, and welding connection.

This type of shut-off valve is very suitable for shutting off or regulating and throttling. Because the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable shut-off function, and because the change of the valve seat port is in direct proportion to the stroke of the valve disc, it is very suitable for flow adjustment.

The shut-off valve is designed for low inlet and high outlet, the purpose is to make the flow resistance small and save effort when opening the valve. At the same time, when the valve is closed, the gasket between the valve casing and the valve cover and the packing around the valve stem will not be stressed, and will not be subjected to the pressure and temperature of the medium for a long time, which can prolong the service life and reduce the probability of leakage. In addition, the packing can be replaced or added when the valve is closed, which is convenient for maintenance.

Many people think that the shut-off valve is low in and high out, but it is not. In general, the shut-off valve is low-in and high-out, but there are some special cases where the shut-off valve is high-in and low-out:

1. High pressure stop valve with a diameter greater than 100mm.

2. Two shut-off valves in series on the bypass pipeline, the second shut-off valve requires "high inlet and low outlet"

3. Boiler exhaust and vent stop valve

4. Electromagnetic quick-break valve