Commonly used cut-off valve has the following:
1) straight cut off valve
2) DC type valve: in the DC type or Y-shaped valve, the valve body and the main channel flow into a slash, this flow state the extent of the damage than the conventional cut-off valve to small, so by the valve pressure loss is also the corresponding small.
3) the angle type valve: in the angle type valve, the fluid only needs to change the direction, so that the pressure drop through the valve is smaller than the conventional structure.
4) the plunger type valve: this type of valve is a conventional valve of the variant. In this valve, the valve seat and valve seat are usually designed based on the principle of the piston. The valve disc is connected to the valve stem and the sealing is achieved by a two elastic sealing ring on the plunger. Two elastic sealing ring separated by a ring, and through the valve cover nut load exerted on the valve cover the periphery of the plunger sealing ring is tightly pressed by the. Elastic ring can be replaced, can be made of a variety of materials, the valve is mainly used for "open" or "off", but with a special form of plunger or special ring, can also be used to adjust the flow.