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Class Information
Number: 137/637.5
Name: Fluid handling > Systems > Valves with separate, correlated, actuators > Coaxial stems > Rotary > Concentric, central valve removable
Description: Subject matter in which a rotary plug valve is within an outer concentric, separately actuated, rotary plug valve and so constructed that the central valve may be removed for repair or other purposes without disturbing the outer valve.

Patents under this class:

Patent Number Title Of Patent Date Issued
7143787 Microluidic valve having two revolving valve elements Dec. 5, 2006
6883541 Manual-automatic water faucet Apr. 26, 2005
4397329 Mixing valve Aug. 9, 1983
4306582 Mixing valve Dec. 22, 1981
4187872 Control valve assembly Feb. 12, 1980
3967535 Uniflow steam engine Jul. 6, 1976

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