If the valve actuator of given Problem has a rangeability of 30 and a maximum stem travel of 5 cm and is to be half-open under the nominal conditions, find the minimum flow, maximum flow, and stem opening for flow.
Problem
The level of water in a tank is to be controlled at 20 m, and the output flow rate is nominally through a control valve, as shown in Figure 51. Under nominal conditions, determine the required valve size in inches and centimeters.
![716_Fig 01.jpg](https://secure.tutorsglobe.com/CMSImages/716_Fig 01.jpg)