Dear LittleInch
thanks a lot for your reply
the valves are 15 years old
isolate sections in gas pipeline ( on / off)
bi-directional
double piston effect
metal seats
but those valves damaged after hydraulic tests of the pipeline.they are always opened as they supply a pressure reduction...
Peace upon you[highlight #204A87][/highlight]
Good day
we have leakage problems in ball valves size 24 - 20- 16 inch i tried to inject the recommended sealant from the manufacturer but still i make a leak test and the same problem exist and i inject flashing chemicals also.
so i need a...
