How many turns are necessary to fully open or close a slow opening valve?

A slow opening valve is specifically designed to gradually control the flow of fluid, and this characteristic is essential for applications where sudden pressure or flow changes could be detrimental. The design of these valves requires more turns to move from fully closed to fully open (or vice versa) compared to other types of valves.

In this case, being accurate in the operation of a slow opening valve is critical. It often takes about five turns to fully open or close such a valve. This gradual operation allows for better control of the flow, reduces the risk of water hammer, and minimizes the potential for system shocks that can occur with sudden changes in pressure. Therefore, understanding the operational characteristics of slow opening valves helps ensure safe and efficient system management, which is why five turns is the correct figure for fully opening or closing this type of valve.