J11TWhen the medium into the valve from the bottom of the valve, the operating force required to overcome the resistance, is the stem and the packing friction and pressure generated by the media thrust force than the valve off the valve opening force, so the diameter of the valve stem, otherwise it will stem bending fault.
The internal thread stop valve belongs to the forced sealing valve, so when the valve closes, pressure must be applied to the disc to force the sealing surface to leak. The emergence of self sealing valve, internal thread, flange valve replaced by medium flow on the top of the valve into the valve chamber, then in the medium under pressure, the valve off a small force, and force open the valve, stem diameter can be reduced accordingly. At the same time, in the role of media, this form of valve is also more stringent. China's valve "three to" has stipulated that the flow direction of the cut-off valve should be top-down. This kind of valve should be installed horizontally in the pipeline.
When the internal thread stop valve is opened, the opening height of the disc is 25%~30% of the nominal diameter. The flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the full opening of the stop valve shall be determined by the stroke of the disc.
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