US Patent No. 9,752,692

CHECK VALVE WITH ACCELERATED CLOSURE


Patent No. 9,752,692
Issue Date September 05, 2017
Title Check Valve With Accelerated Closure
Inventorship Ashraf Abouelleil, Oswego, IL (US)
Julian Ramirez, Aurora, IL (US)
Purushottam Savalia, Aurora, IL (US)
Assignee Mueller International, LLC, Atlanta, GA (US)

Claim of US Patent No. 9,752,692

1. A check valve, comprising:
a valve body defining an inlet, an outlet and an interior cavity, the valve body further defining a port in the interior cavity
that has a circumferential downstream port shoulder surface; and

a flapper assembly that is movable between an open position, providing fluid communication between the inlet and outlet, and
a closed position, isolating the inlet from the outlet, the flapper assembly comprising:

a resilient body extending from a proximal hinge portion to an intermediate portion and to a distal flap portion, wherein
the hinge portion is configured to be fixedly mounted in the valve body, wherein the intermediate portion and the flap portion
have an upstream surface and a downstream surface, the downstream surface of the resilient body defining a first step at a
transition from the intermediate portion to the flap portion; and wherein portions of an upstream surface of the flap portion
are configured to seal the downstream port shoulder surface of the valve body when the flap portion is in the closed position;
and

a spring assembly that is configured to bias the flap portion of the resilient body towards the closed position, the spring
assembly comprising:

a spring comprising a proximal mounting end that is mounted to a portion of the downstream surface of the intermediate portion
of the resilient body, a distal end that is configured to slideably engage portions of the downstream surface of the flap
portion, and a middle portion that extends from the proximal mounting end to the distal end; and

a backing plate that is mounted to a portion of the upstream surface of the intermediate portion of the resilient body in
opposition to the proximal mounting end, wherein the proximate mounting end and the backing plate are configured to increase
the stiffness of the intermediate portion of the resilient body relative to the proximal hinge portion and the distal flap
portion of the resilient body.