Valve plays an cut off in its line in the medium and the important role of throttle, cut-off valve, as a kind of extremely important truncated class valves, which exert torque on the valve stem seal, valve stem in axial direction to the pressure on the disc, the valve sealing surface and the valve seat sealing surface fit closely, prevent leakage of medium along the gaps between the sealing surface.
The sealing pair of the globe valve is composed of the sealing face of the valve disc and the sealing face of the valve seat. The stem drives the valve disc to move vertically along the center line of the valve seat. In the process of opening and closing the globe valve, the opening height is small, it is easy to adjust the flow, and it is convenient to manufacture and maintain, and the pressure is applicable to a wide range.
Compared with another kind of commonly used truncation valve in industrial production, the cut-off valve is simpler than the former in terms of structure, which is easy to manufacture and maintain. In terms of service life, the sealing surface of the globe valve is not easy to wear and scratch, and there is no relative sliding between the valve disc and the sealing surface in the process of valve opening and closing, so the wear and scratch on the sealing surface is small, so the service life of the sealing pair is improved. The globe valve has a small stroke in the process of full closure, and its height is relatively smaller than the alarm valve. The disadvantage of the globe valve is that the opening and closing moment is large and it is difficult to realize the fast opening and closing. Because the flow channel in the valve body is tortuous and the fluid flow resistance is large, the fluid power loss is large in the pipeline.