To this end, prepared to discuss this release, the revised feasibility of intra-industry exchanges, arising from the business concerns in this regard, to improve work in this area. 1.; Specifications and types of valves, pipes should be in accordance with the requirements of design documents. 1.2; the valve should be specified based on Model GB code requirements. If the enterprise standard models should be specified instructions. ? 1.3; valve working pressure of the working pressure ≥ pipeline, prices will not be affected under the premise of the valve can withstand working pressure pipe should be larger than the actual pressure of work; valve closed condition either side should be able to withstand 1.1 times the work pressure valve without leakage; valve open condition, valve body should be able to withstand twice the pressure valve work requirements. 1.4; valve manufacturing standards, should indicate the basis of the national standard code, if the enterprise standards, procurement contract shall be accompanied by a business document 2? Valve material? 2.1; valve material, gray cast iron pipe as a result of the progressive is not recommended the use of body-based material should be ductile iron, and indicate the grade and the actual casting of the physical and chemical test data. ? 2.2; stem material to stainless steel stem (2CR13), large diameter valves should be stainless steel stem inlay package. ? 2.3; nut material, the use of cast brass or cast aluminum bronze, and the hardness and strength are greater than the stem 2.4; stem bushing material, its hardness and strength shall be not more than stem and immersed in water conditions with the stem, not the formation of electrochemical corrosion body. 2.5; sealing surface of the material ① different types of valves, sealing methods and materials require different; ② ordinary wedge gate valve, the material铜环fixed way, grinding should be that way; ③ Soft sealing valve, the valve plate rubber lining material of the physico-chemical and health testing data; ④ butterfly valve body shall identify the material on the sealing surface and sealing surface material butterflies board; their physical and chemical test data, especially the health requirements of rubber, anti-aging performance, wear-resistant performance; usually small eyes, such as rubber and EPDM rubber, recycled plastic mixed prohibited. ? 2.6; valve shaft packing? ① network as a result of the valves, usually do not frequent sluicegate asked not to fill in a few years the activities do not fill the aging and long-term effects remain sealed; ② fill valve shaft should bear the frequent headstock, the sealing effect of the good; ③ the light of the above requirements, fill valve axis does not strive for life or not to replace more than a decade;? ④ For replacement of packing, valve design should be considered to have the situation under pressure to replace the measures . 3? Speed gearbox 3.1; box inside and outside the anti-corrosion materials and principles with Valve. ? 3.2; box measures should be sealed, after the tank assembly to be capable of sustaining the status of three meters of water immersion. Box 3.3 on the hoist limit devices, the adjustment nut should be箱体外. ? 3.4; drive the structural design of a reasonable gate valve when the drive shaft can only rotate, did not make it up and down a rocky ledge, moderate occlusal transmission components, with no separation of the load when the sliding headstock. ? 3.5 ; Transmission Box Office with the valve shaft seal without leakage can not be connected whole. ? 3.6;箱体外no debris, gear grease occlusal protection shall be provided. ? 4? Valve operation of institutions 4. Valve operation of the hoist direction, shall be clockwise to close. ? 4.2 ; As a result of pipeline valves,
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