Can someone explain why most valve manufacturers seem to place an upper limit of Mach number of about 0.3 at the valve exit? All the literature I have seen tends to give excessive noise as the major reason for this limitation. Is noise the only issue, or is wear and tear (because of vibration)...
Has anyone had experience using control valves in a helium environment? If so, I am interested in understanding what the issues are around using standard control valves for this application. People have mentioned to me that "cold welding" is an issue in a helium environment and for...
