Hauck Wafer Butterfly Valves are used to trim or control ambient or preheated air. The valve can be ordered with a hand lever or can be supplied with a lever and linkage for automatic control. When sizing wafer butterfly valves for automatic control, normal practice is to size for a valve differential pressure (Δp) of 10-20% of total available air pressure. When ordering, specify temperature service desired: ambient air to 400°F, or preheated air to 1200°F.
Valves should be selected for maximum flow at no more than 70° open. Full ported wafer valves installed in lines of the same size offer increased flow for a fixed pressure drop up to 70° open. At greater openings, flow does not increase appreciably although pressure drop across the valve falls off rapidly. At 90° open, resistance is very low -pressure drop is practically zero.
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