The opening and closing parts of the import stop valve are plug-shaped disc, the sealing surface is flat or cone J941H-16, the valve flap linear motion along the centerline of the fluid. Stem movement form, lifting rod (stem lift, hand wheel does not lift), there are lifting rotary rod (hand wheel with the stem rotating together, the nut is located in the valve body). Globe valve only applies to fully open and fully closed, does not allow for regulation and throttling. Globe valve is a forced sealed valve, so the valve is closed J941H-320, the valve must be pressure to force the sealing surface does not leak. When the medium from below the valve into the valve, the operating force needed to overcome the resistance is the valve stem and packing friction and the thrust generated by the media pressure, off the valve force than the valve open, so the valve stem The diameter should be larger, otherwise it will happen valve stem bend. In recent years, from the self-sealing valve after J41Y-16I, the cut-off valve to change the flow of media from the top of the valve into the valve cavity, then under medium pressure, the valve off the force is small, and open the valve force, The diameter of the stem can be reduced accordingly. At the same time, in the medium, this form of valve is also more stringent. China's valve "three to" have provided that the flow of the valve, all from top to bottom. When the valve is opened, the valve opening height J41T-150LB, 25% to 30% of the nominal diameter, the flow has reached its maximum, indicating that the valve has reached the fully open position. Therefore, the full-stop position of the valve, valve stroke should be determined. Valve material: cast steel, carbon steel, stainless steel, 304,316 and so on. Valve specifications: DN15-DN1200. Pressure: 1.0-32Mpa Drive mode can be manual, electric, pneumatic, gear drive and other devices. Standard: GB, American Standard, Japanese standard, German standard. Main features and uses: 1. Turn the handwheel clockwise to turn off. 2. Can be installed anywhere in the pipeline, the media flow from the bottom up. 3 product compact, reliable sealing and flexible operation. 4. For petroleum, chemical, power, metallurgy, food, medicine, textile, paper, water supply and drainage and other industrial sectors. 5. Stainless steel globe valve for all types of corrosive media pipeline, a good anti-corrosion and adequate strength.
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