Rotary control valves

Rotary control valves are direct through design to provide less resistance to flow and a higher pressure recovery.

As a consequence, they provide a higher flow capacity with low pressure loss than equivalent size globe body valves that may make they appear more economical. .

Rotary control valves include all forms of butterfly valves as well as ball valves are most designed to be installed “sandwiched” between piping flanges.

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If it can be avoided you should not use a butterfly for control. Butterfly valves have a very small controllable range generally in the 25% to 50% range only

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