By Marc L. Riveland and Andrew Kinser Depending on the methods ball valve manufacturers use to determine their published rated flow capacities, the resulting value may be different, even for virtually ...

Most design engineers select pneumatic control valves based on performance data published by the valve manufacturer. Usually the key performance factor is how much air a particular valve can flow.

Feedwater control valves play a critical role in boiler operation. One important parameter of their design is the pressure drop at the rated condition as well as off-design conditions.