Stainless steel internal thread globe valve J11W

The structural forms of the internal thread cut-off valve body include straight through, straight through, and right angle. The straight through type is the most common structure, but it has the highest fluid resistance. Direct flow fluid has low resistance and is commonly used for fluids containing solid particles or high viscosity. Right angle valve bodies are often forged and suitable for globe valves with smaller diameters and higher pressures.

When the medium enters the valve from below the valve disc through the internal thread of the valve, the resistance that the operating force needs to overcome is the frictional force between the valve stem and packing and 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.

Internal thread 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. After the appearance of self sealing valves, the flow of medium in the internal thread and flange stop valve is changed to enter the valve chamber from above the valve disc. At this time, under the pressure of the medium, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. 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 type of valve should generally be installed horizontally in pipelines.

When the internal thread 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 should be determined by the stroke of the valve disc.

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