The status of the variant things when tightly closed mat office as shown in figure 1. 6 conclusion improved testing device through the practical application, the micro resistance slowly-closing butterfly check valve and solve the issue of large diameter high pressure valve hydraulic attempt. The blind flange rigidity check. When the blind flange suffered from internal pressure, signature by relaxing the springback, signs of compressed volume decreases, and when signs to relax, to a certain extent exposed leak in a little tightly closed I curve reflects the clamping force on the minimum needed to tightly closed in fruit, swing check valves as long as reasonable selection tightly closed mat, in a blind flange rigidity satisfied thing condition tightly closed the minimum clamping force is easily satisfied. Q: large-diameter flat gate valve hydraulic try device answer: 1 roughly with the progress of science and technology, large diameter, high temperature resistant, resistant to high voltage flat gate valve for a wide range of applications. When the transverse pressure decreases, and tightly closed pad, the minimum clamping force is reduced accordingly, rigid requirements for blind flange also reduced accordingly. 5 improvement aimed at the problem of insufficient rigidity of the pressure testing device lie made the surface of the two ball check valve for the structure is improved. To a nominal diameter of 1 500 mm, the import the relief valve body and the bottom one 620 mm in diameter, for example analysis. But in actual production, because of blind flange rigidity is not enough, in the end face of the pressure utility under the excessive variant, the screw loose variant, API cast steel check valve American standard tightly closed mat compression excessive amount of rebound, so tightly closed tightly closed lower than reduce, thus form a tight sealing leak caused pressure losses. In order to successfully implement hydraulic safety dependable sex to try, common growth after a blind flange rigidity, with good tight sealing pad to successful implementation. By mechanical analysis, the blind flange can't satisfied with testing the strength and rigidity requirements, namely hydraulic try there is no way to implement. Change pressure blind flange to test board, after pressure testing body boards reduce transverse stress plane, or the size of the object surface, thus reduce the pressure of face, and to reduce the gasket pre-tightening force, hydraulic pressure to try to achieve reliable security. 2 test method of large diameter valve in the hydraulic try butterfly check valve, common right and blind method using screws, through bolt pre-tightening force to form tightly closed pad initiation compressed tightly closed absorption solution, to a successful implementation of the import of the valve tightly closed. But for large diameter high pressure valve pressure testing, rigid infinite check to growth and sees fit and use high quality tightly closed pad, capital will increase production in the process of practice, there is very big restriction. 3 analysis in the process of pressure testing, up and down type check Industrial Valves force F F = PS blind flange end face the pressure formula shows that the pressure test to confirm the things, only through structure to reduce the size of the transverse stress plane or surface, up and down type check valve successfully reduce the pressure of the end. Increase pressure force under the effect of F0, signs of initial amount of compression for the up and down to the clamp type check valve. To think right and use common sense to choose A3 steel circular engraving, h = 70 mm, the thickness of the radius R = 0 mm 89 Marine valve, hydraulic water mark a stem valve elastic modulus E = 2. 0 times ten to the six Fang Zhao PASCAL, by the rigid core. 。 According to the type, 1) To test the blind plate force F = 515 KN. Try new device as shown in figure 5. For micro resistance slowly-closing check facilities and test valve size limit, a lot of large diameter plate gate valves no execute hydraulic press for trying, so according to the unique local preset pressure testing device of the valve. 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 valve, hydraulic control valve and other kinds of valves.
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