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Yes your right, if the valve is withstand at test pressure then it will safe for any other lower pressure, but generally valve testing is done at static condition hence no dynamic forces are consider. however in real world due do tremendous velocity of fluid dynamic forces may cause damage to...

yes, when the valve is closed hydro-static pressure should be considered ..here in this case full 390 bar.. but when valve is open ...hydro-dynamic pressure will in to the picture i think that will act on internal of valve body ..it is a base rule in valve engineering ..that valve should be...

thank you all, for amazing replies...i think question was quit simple as you all experienced guys got misunderstand ....it was about conservation of energy - "pressure converted in to velocity" to generate flow then what would be the reduced pressure. i presume in valve engineering it is called...

Hi all, I am working on high pressure valve design and need help from piping experts.. when we pass a clean water at 390 bar (5656 psi) through pipe line, then what amount of pressure will act on wall of the pipe ? as a beginner, i feel 390 bar pressure will not directly act on pipe as...

Hi, can anybody please tell me correct the formula to find Polar moment of Inertia of Equilateral triangle. i have got two formulas (bh^3)/36 and (bh^2)/12 i think these formulas are not for polar moment of inertia. please let me know if anybody knows the answer Thanks feng09

Hi all, Based on the above discussion.. can anyone advise me how to find torques carrying capacity of bolting head such as soceket head cap screw and hexagonal head .. Thank you in advance... :) Regards feng09

Thank you very much all... :)

Thank you very much Kenat, it is a good help for me at this initial stage, but still confused as thread forms are universal around the globe and irrespective of the bolt head so the bolt manufacturer should design the bolt head to withstand the tightening torque for that particular thread...

Hi, Can anybody tell me how to find tightening torque for socket head cap screw. I am sure tightening torque for hex head bolt and socket head cap screw will be different I think the procedure mentioned in machinery's handbook is for hex head bolt. Please comment on this Thank you..! ! !

Hello FEA Champions, i have a small problem in my FEA Study, i am working on ANSYS Workbench 13.0 trying to simulate a small 5 components assembly. little bit of background - Assembly is made up of metal and rubber (PTFE) components. at the time of assembly these soft component gets squashed...

please share your thought on this ... :)

thank you valvit..

Thanks a lot valvit and gerhardle for quick response. i Would imagine the MAST value is more related to torque carrying capacity of stem which is in actuator point of view but if we think of butterfly valve then stem disc connection or stem groove for anti-bolow out ring could be the weakest...

Hello FEA Champions, i have a small problem in my FEA Study, i am working on ANSYS Workbench 13.0 trying to simulate a small 5 components assembly. little bit of background - Assembly is made up of metal and rubber (PTFE) components. at the time of assembly these soft component gets squashed...

Hello Valve Engineers, can any body tell me what is maximum allowable valve input torque? i would imagine it is nothing but the MAST but i am not sure, ISO 12490 explain MAST very well is MAVIT mentioned in any valve/actuator standards ? many thanks in advance :)