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Class Information
Number: 137/601.17
Name: Fluid handling > Systems > Dividing into parallel flow paths with recombining > Rotary valve > Butterfly valve

Patents under this class:

Patent Number Title Of Patent Date Issued
8342206 Dual butterfly control valve and method of use Jan. 1, 2013
8307850 Air intake device for engine Nov. 13, 2012
8196605 Air intake device for engine Jun. 12, 2012
7814748 Exhaust bypass valve remote linkage Oct. 19, 2010
7543759 Multi-valve damper for controlling airflow and method for controlling airflow Jun. 9, 2009
7513823 Linear VAV box Apr. 7, 2009
7428915 O-ringless tandem throttle valve for a plasma reactor chamber Sep. 30, 2008
7392826 Valve device and multiport regulating assembly comprising a plurality of such devices Jul. 1, 2008
6991177 Multi-valve damper for controlling airflow and method for controlling airflow Jan. 31, 2006
6568417 Throttle valve assembly May. 27, 2003
6557826 Low leakage butterfly damper May. 6, 2003
6293306 Throttle gate valve Sep. 25, 2001
6206034 Valve with integral flow switch Mar. 27, 2001
6192930 Valve device Feb. 27, 2001
6192931 Damper blade control Feb. 27, 2001
5113910 Butterfly valve with biased area reduction means May. 19, 1992
4969485 Butterfly valve apparatus and method Nov. 13, 1990
4962783 Butterfly valve apparatus and method Oct. 16, 1990
4909211 Barrel-type throttle valve for engine air intake Mar. 20, 1990
4860535 Power plant for burning a fuel at high pressure and a gas turbine driven by the combustion gases Aug. 29, 1989
4791782 Fluid outlet duct Dec. 20, 1988
4682674 Apparatus for limiting back pressure in an exhaust-type engine suppressor Jul. 28, 1987
4610197 Damper blade construction Sep. 9, 1986
4580603 Shutoff valve with a flap member Apr. 8, 1986
4573441 Valve arrangement Mar. 4, 1986
4438049 Carburetor engine idle speed air bypass Mar. 20, 1984
4347869 Hydraulic valve position control system for regulating smokestack exhaust pressure Sep. 7, 1982
4113232 Smoke, fire and air control damper with stamped blade Sep. 12, 1978
4113230 Rotating blade fire damper Sep. 12, 1978
4081173 Rotating blade fire damper Mar. 28, 1978
3993096 Damper construction Nov. 23, 1976

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