2. 5 tightly closed the valve material (1) category, tightly closed form and the material requirements; (2) the usual wedge gate valve, the material of copper ring, fixed form, grinding should be explained; (3) soft tightly closed gate valve, valve plate rubber lining material and sanitary inspection and physical chemistry numerical; (4) butterfly valves shall be marked on the valve body tightly closed surface material and butterfly plate tightly closed surface material; Their physical and chemical testing values, especially rubber sanitary requirements, ageing resistance, wear resistance; Generally considered appropriate and nitrile butadiene rubber and epdm and so on, mixed with reclaimed rubber is prohibited. 2. 2 stem material, hankers after stainless steel stem ( 2CR13) , large diameter valves also should be embedded package of stainless steel stem. 2. 6 valve shaft packing (1) because the network of the valve, generally is not opening and closing more, packing in a few years no activity, packing is not aging, long time maintain tight sealing effect; (2) valve shaft packing should also be taking more opening and closing, tightly sealed effect is satisfactory; (3) in view of the above requirements, the valve shaft packing for lifetime don't change or ten far do not change; (4) packing if need to change, the valve default should ponder question can have water pressure change under the condition of the solution. 。 1. 4 valve production standard, should be explained according to gb code, if is the company's standard, collection and purchase contract should be attached to the company files. 1. 3 office pressure valve, the requirement of pipe or office pressure, without affecting the price under the premise of the valve can bear work pressure should be greater than pipeline of actual work; The no matter what side of the valve closed should be able to take 1. 1 times the working pressure of valve value without leakage; Open valve, Marine valve body should be able to undertake the double valve pressure requirements. 2. 3 screw nut material see fit, and the use of cast aluminum brass or aluminum bronze ware, and the hardness and strength were greater than the valve stem. 1. Should indicate the valve type is according to gb code requirements. If is the company's standard, should indicate the type of treatment that Chen. Q: a collection to buy soft tightly closed gate valve reference factors: sampling to buy soft tightly closed gate valve to purchase a general requirements: 1. In accordance with pipeline by class 1 valve specifications, the requirements of the default file. Sampling to buy soft tightly closed gate to buy general requirements of the two: 2. The valve standard quality 2. 1 body material, should give priority to with ductile cast iron, and indicate the brand and actual values of physical and chemical testing of cast iron. 2. 4 stem bushing material, its hardness and strength should be half more than the Industrial Valves stem, and in the condition of bubble in the water and the valve stem, valve body don't form the electrochemical corrosion. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly valve, gate valve, globe valve, check valve, relief valve, safety valve, Marine valve, oil Industrial Valves, hydraulic control valve and other kinds of valves.
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