Analysis of the inability to manually operate ball valves, gate valves, and globe valves
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For ball valves, gate valves, and globe valves, what pressure difference and pipe diameter are required before manual operation becomes impossible? Which of the three valves is the most efficient?
Large pressure difference before and after the valve, large valve diameter, issues with valve stem sealing
It should be able to operate within the allowable pressure range
Is the poster considering using a manual large valve with a transmission mechanism to ease the workload for the operator?
For valves that are operated using a handwheel, there are standard requirements stating that the circumferential force exerted by the wheel during operation should not exceed 360 N; if this value is exceeded, there is a problem with the valve