Globe valves such as DIN angle type Globe Valve, also known as gate valves, are mandatory sealed valves, so when the valve closes, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the disc, the resistance to be overcome by the operating force is the friction of the stem and packing and the thrust generated by the pressure of the medium. There are three types of connection methods: flange connection, thread connection and welding connection. After the appearance of the self-sealing valve, the medium flow direction of the globe valve will enter the valve chamber from above the disc. At this time, under the pressure of medium, the pressure of closing the valve is small, while the pressure of opening the valve is large, and the diameter of the stem can be reduced accordingly. At the same time, under the medium action, the valve of this form is also more rigorous. Our country valve "3 change give" once regulation, stop the flow direction of the valve, adopt from top to bottom. When the globe valve is opened, the height of the disc is 25% ~ 30% of the nominal diameter. So the full open position of the globe valve should be determined by the stroke of the disc.

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