Butterfly valve apparatus and method

Details Butterfly valve apparatus and method Butterfly valve apparatus and method

1989-10-16

1990-11-06

Nilson, Robert G.

Fluid handling

Processes

251218, 251283, 251305, 251308, F16K 122

Patent

active

049677780

ABSTRACT:
A butterfly valve includes a duct defining a fluid flow path and a plate-like valve member pivotal in the duct to in one position span and close the latter. The valve member is pivotal to a second position spanning the duct and extending parallel to the flow path to allow fluid flow therein. Means are provided for altering the effective area distribution of the valve member about its pivot axis to decrease the operating torque required by the inventive valve in comparison with conventional butterfly valves.

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