American standard stop valve is mainly two points: A. American standard non-stop valve non-valve control switch valve, the secondary pressure for the medium to do less pressure and the heart is not a small place. The key parts of the American standard stop valve are the valve disc and the valve seat. The valve disc moves along the center line of the valve seat, changes the interval between the valve disc seats, the American standard stop valve, And grasp the war ended fluidity. In order to avoid leakage, valve disc to take contact with the valve have been grinding cooperation. The characteristics of the non-stop valve to do a solid, close, difficult to regulate or cut off the quality of the flow, the next big degree of closure (general throat diameter of 1/4). However, the structure is complex, the price is relatively cheap, body fluid resistance, slow switch. The fixed circular valve of the cut-off valve is under the body of the valve, and the ordinary non-back-drip valve. Two. US standard stop valve is usually used in the working medium has a certain corrosive occasions. Any of a variety of valve materials, the resistance to working medium corrosion is relatively limited, and many factors. If used in the manufacturing process and heat treatment process properly, and thus ensure the corrosion resistance of this material. As for the concentration of> 98% concentrated nitric acid medium, no matter what kind of heat treatment process, the steel does not have corrosion resistance. Therefore, according to the nature of the working medium to choose the valve material, we must also study the media concentration, temperature and material heat treatment process and other factors on the corrosion resistance.
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