Globe valve ( 截止阀、截止阀) The opening and closing is plug valve, sealing surfaces appear flat or cone, disc make linear movement along the seat of the centerline. Stem form of exercise, ( Common name: non-rising stem) , also have lift rotating bar type, ( Common name: Ming) Stop valve is closed ( The disc) Along the valve seat centerline mobile. According to this mobile form of disc, seat and disc change in his itinerary directly proportional relationship. Due to open or close the valve stem travel relatively short, and very reliable cutting function, and due to the change of his seat and disc stroke proportional relationship, is very suitable for the traffic regulation. Therefore, this type of globe valve valve closure is very suitable for as a cut or adjust and throttling. Working principle of the cut-off valve, also called door and valve is one of the most widely used, it is popular, is due to open and close in the process of friction surface, more durable, opening, manufacturing easy, convenient maintenance, not only suitable for low voltage, and is suitable for high pressure. Globe valve closure principle is, rely on the valve rod pressure, sealing surface and the valve seat valve sealing surface fit closely, prevent medium circulation. One-way flow cut-off Industrial Valves only medium, the installation direction. The structure of the cut-off valve length is greater than the gate valve, fluid resistance is big, at the same time run for a long time, seal reliability is not strong. Advantage 1, simple structure, manufacture and maintenance more convenient. 2, small work schedule, opening and closing time is short. 3, good sealing, small friction between the sealing surface, long service life. 4, as the structure of the valve body has a straight-through, straight and right Angle type. Straight-through are the most common type of structure, but the maximum resistance of the fluid. Once-through flow fluid resistance small, usually for containing solids or the viscosity of fluid. Right Angle type body more forged, suitable for small drift diameter, high pressure cut-off valve. 5, in the process of opening and closing sealing surface friction is smaller than gate valves, wear-resisting. 6, usually only one seal face, good manufacturing process, easy to maintenance. Disadvantages 1, the fluid resistance is big, required when opening and closing force is larger. 2, does not apply to take larger particles, viscosity, easy to coking of the medium. 3, poor regulation performance. 4, bellows seal globe valve adopts the design of the bellows seal, completely eliminates the common valve stem packing seal aging fast easy leakage faults, corrugated pipe cut-off valve not only improve the efficiency of energy use, increase production equipment safety, maintenance cost was decreased, and the frequent maintenance, also provides a clean and safe work environment.
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Unlike the resilient gate valve, the is more flexibly used in accasions where resilient seated valve .