[Al Skierkiewicz]

Frank and Karlis,
When I see the specification "working pressure" and it displays a range, I think that the manufacture is telling me that all operations and life cycles will be warranted under those conditions. I don't believe that the spec is a max pressure at which the valve fails to operate. This is not burst pressure. I suspect that the rule is written so that teams use components that will operate as expected should the system go over expected pressures. For instance, if a valve is holding an assembly up, I would not want the valve to suddenly bypass pressure and release the mechanism. Can you contact the manufacturer and show them the rule and how their valve is interpreted under that definition?