Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Reexamination Certificate
2009-07-27
2011-10-04
Hepperle, Stephen M (Department: 3753)
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
C137S883000, C137S471000, C137S473000, C004S342000
Reexamination Certificate
active
08028719
ABSTRACT:
A control stop for a flush valve for a urinal or toilet fixture includes a housing defining a flow chamber divided by a valve seat into inlet and outlet sections. A valve structure is biased toward the valve seat by a spring applying a valve closing spring force. The housing is sealed by a diaphragm, and the diaphragm covers the movable valve structure, isolating it from water flowing through the housing. The diaphragm does not impede valve structure movement, and the closing spring force establishes a threshold water supply pressure for opening the control stop during increasing pressure following a no or low supply pressure condition. A plurality of control stops may supply a bank of flush valves and fixtures, and open in a cascading sequence during increasing pressure as a result of having springs with different closing spring forces.
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Foley & Lardner LLP
Hepperle Stephen M
McCalister William
Sloan Valve Company
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