This is probably a dumb question but I am sizing a high performance butterfly valve to a scotch yoke actuator and am confused regarding the open and closed position. If the valve is fail closed should the spring close it on the upstream or downstream side?
I have an order that has been delayed by 2 months from the manufacturer. The order is for SST ball valves with PCTFE (Kel-F) seats and 6" pups. The order is shipping from Italy so I am looking at another 4 week delay. Is there anything that can be done to a standard SST ball valve as...
