As the stem and the valve seat sealing surface of the vertical axis. Valve stem to open or close the trip is relatively short, and has very reliable cutting effect, so that the ideal as a medium for the valve, cut off, or regulate the use of.
Cut-off valve in the open position, the valve flap, and its seat, and no contact between the valve sealing surface, there is a very reliable cutting role, and in light valve suitable to serve as a medium, cut off or adjust and cutting.
Once the cut off valve is opened, it is no longer between the seat and the sealing surface contact, so it is a small mechanical wear valve sealing surface of valve, as the most cut-off valve seat and valve repair or replacement of more easily sealed components, you do not remove the pipe valves and pipe welding to make a very applicable to the whole valve. Medium, through the valve flow direction change, so a higher cut-off valve of the flow resistance of other valves.
Commonly used cut off valve is as follows:
1) Angle type globe valve, globe valve type in the corner and change the flow in one direction only, therefore, through this small cut than the traditional structure of valve pressure drop valve.
2) DC-type cut-off valve; in the DC-type or Y-cut-off valve, enter a slash valve flow channel with the mainstream Road, so that the extent of damage in the country is less than the traditional cut-off valve movement and therefore the pressure loss through the valve accordingly smaller.
3) The plunger-type valve: This form of cut-off valve to cut off, is a traditional shear valve. In the valve, globe valve valve and valve seat are usually based on the plunger principle of design. Into the valve stem polishing is connected with the plunger, plunger seal sealing two flexible implementation. Two elastic rings separated by a ring and, through the valve cover nut exerted on the valve cover seal around the prison, the plunger pressure load. Elastic ring can be replaced, you can use different materials, the valve is mainly used for "open" or "off", but there are special plunger or a special form of rings can also be used to adjust the flow.