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Globe valve, also called intercept, is the most widely used valve, it is popular because of the small friction between the sealing surface in the process of opening and closing, relatively durable, open height is not large, easy to manufacture, convenient maintenance, not only suitable for low pressure, but also suitable for high pressure The closing principle of the globe valve is to rely on the pressure of the valve bar to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit to prevent the flow of media.
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.
Globe valve (Stop valve,PP Globe Valve) opening and closing parts are plug shaped valve disc, sealing surface is flat or conical, valve disc along the center line of the seat for linear movement. Stem movement form, (common name: dark rod), there are also lifting rotary rod type, (common name: bright rod) globe valve refers to the closure of the piece (disc) along the center line of the valve seat movement. According to the moving form of the disc, the change of the valve seat opening is directly proportional to the disc stroke. Due to this kind of valve stem open or close stroke is relatively short, and has a very reliable cut off function, and because of the change of the valve seat opening and the stroke of the disc is directly proportional, very suitable for flow regulation. Therefore, this type of cut-off globe valve is ideal for cut-off or regulation and throttling.
Working principle and characteristics of globe valve: 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 globe valve is composed of disc sealing surface and seat sealing surface, and the valve stem drives the disc along the center line of the seat for vertical movement. In the process of opening and closing, the opening height of the globe valve is small, and it is easy to adjust the flow, and it is convenient to manufacture and maintain, and the pressure is widely applicable.
Compared with another commonly used cut-off valve in industrial production - alarm valve, in terms of structure, globe valve is simpler than the former, easy to manufacture and maintenance. From the service life, the globe valve sealing surface is not easy to wear and scratch, valve opening and closing process and no relative sliding between the disc and the sealing surface, so the wear and scratch of the sealing surface is small, so improve the service life of the sealing pair globe valve in the full closing process of the disc travel is small, its height is relatively small alarm valve. The disadvantage of PVDF globe valve is that the opening and closing torque is large and it is difficult to achieve fast opening and closing. Because the flow channel in the valve body is relatively tortuous, the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.
Stem axis of globe valve is perpendicular to sealing surface of valve seat. Stem opening and closing stroke is relatively short and has very reliable cutting action, making this valve suitable for medium cutting or regulating and throttling use.
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