oxygen stainless steel valve in the physical and chemical experiments often use oxygen, nitrogen, hydrogen and argon gas, etc. These gases are usually stored in the special high pressure gas. When used by gas pressure reducing valve will be reduced to the experiment requirement, within the scope of the then through the other control valves for fine-tuning, using gas into the system. Oxygen valve are forced to seal valve, so when the valve is closed, must be pressure on the disc, to force sealing surface does not leak. When the medium from below the valve plate into the valve 6, the operating force to overcome the resistance is the friction between stem and packing and medium pressure to produce thrust. Close the valve is greater than the force to open the valve, therefore the diameter of the stem is larger, otherwise it will lead to stem the top bending failure. In recent years, since the emergence of seal valve flange above the medium flow direction of cut-off valve is not the disc into the valve chamber. Close valve under the effect of medium pressure, the force is small, and open the valve force is very big, so it can reduce the diameter of the stem. At the same time, under the action of medium, this type of valve is tight. China's 'three way valve' had a globe valve valve should flow from top to bottom. When the oxygen valve opens, when the disc height is opened - 25% of nominal diameter 30%, reach maximum flow, valve has reached the full open position. Cut-off valve fully open position, therefore, should be decided by the disc of travel.

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