General requirements 1, the specifications and categories of soft sealing gate valves should meet the requirements of piping design documents. 2, the type of the Soft Seal Gate Valve should be marked with the GB number requirement. If the enterprise standard, should specify the relevant description of the model.
3, the working pressure of the soft seal gate valve requires that the working pressure of the pipe is greater than that of the pipe. Under the premise of not affecting the price, the valve can bear the working pressure more than the actual working pressure of the pipe. The valve should be able to withstand 1.1 times the valve pressure value on any side under the closed condition of the soft seal gate valve without leakage; the valve body should be able to bear two times the valve under the valve opening condition. The requirement of gate pressure.
4, the manufacturing standards for soft sealing gate valves should be based on the national standard number. If the enterprise standard, the procurement contract should be accompanied by enterprise documents. Two, soft seal gate valve quality 1, the valve body material should be cast iron, cast steel, stainless steel, 316L and mark the physical and chemical test data of the grade and cast iron. 2, stem material, to stainless steel stem (2CR13), large caliber valve should also be stainless steel embedded package stem. 3, the nut material is made of cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than that of the stem. 4, the hardness and strength of the valve bushing material should not be greater than that of the stem, and it will not form electrochemical corrosion with the valve stem and valve body under the condition of water immersion.
5, the material of the sealing surface
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