3-2-2 Stop valveIt sometimes becomes necessary to stop the flow in a pipeline because of serviceproblems, repair work, draining for cleaning, branch connection work. maintenancerequirements, etc. An effort should be made to restrict the affected service area tothe minimum. For this reason, an adequate number and type of isolating valves suchas gate (sluice) valves, butterfly valves, etc. must be provided in a pipeline
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