Structural form of globe valve
Structural form of globe valve
The opening and closing component of a stop valve (Globe Valve) is a plug shaped valve disc, with a sealing surface that is flat or conical. The valve disc moves linearly along the centerline of the valve seat. The motion form of the valve stem is a valve that moves along the centerline of the valve seat. According to the movement of the valve disc, the change in the valve seat opening is directly proportional to the stroke of the valve disc. Due to the relatively short opening or closing stroke of the stem of the globe valve and its highly reliable shut-off function, as well as the proportional relationship between the variation of the valve seat opening and the stroke of the valve disc, it is also very suitable for regulating flow globe valve. Therefore, this type of valve is very suitable for cutting off, regulating, and throttling purposes.The main stop valve product names of China Stop Valve Network include:The main stop valve product names of China Stop Valve Network include:ANSI Flange Straight-through Globe Valve,ANSI Flange Straight-through Bellows Globe Valve,Angle-type Ammonia Globe Valve,DIN Angle-type Bellows Globe Valve,Electric Flange Straight-through Globe Valve,External Thread Ammonia Globe Valve
Globe valves belong to forced sealing valves, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the frictional force between the valve stem and the packing, as well as the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the diameter of the valve stem should be larger, otherwise the valve stem bending fault may occur. In recent years, with the emergence of self sealing valves, the flow of medium in shut-off valves has shifted from above the valve disc into the valve chamber. Under the pressure of the medium, the force required to close the valve is small, while the force required to open the valve is large, resulting in a corresponding reduction in the diameter of the valve stem. Meanwhile, under the influence of the medium, this type of valve is also relatively tight. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom. This valve should be installed horizontally. When the globe valve is opened and the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached its maximum, indicating that the valve has reached the fully open position. So the fully open position of the shut-off valve is determined by the stroke of the valve disc.
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