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  1. kprakash

    Holes for safety of valves in wedge (gatevalve) and ball (ball valves)

    thankyou for the information These are as per SHELL standards as you have said the hole side is upstream except for pump,psv discharge where it is on downstream side. thanks regards prakash kamath prakash kamath
  2. kprakash

    Holes for safety of valves in wedge (gatevalve) and ball (ball valves)

    Can any body tell me the side of valve (upstream or downstream of flow) for the hole to be drilled on wedge(in case of gate valves) or ball(incase of ball valves) of cryogenic valves for safety. What is the logic for selecting the side of hole drilled before installation? regards prakash...
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