Abstract: A backflow assembly including a housing with a passage having at least one check valve positioned therein to permit fluid flow in one direction while preventing fluid flow in the reverse direction. The check valve includes a valve head connected to a stem having an outer surface. A hump extends radially outward from the outer surface of the stem. The stem is guided by a bushing during opening and closing of the valve. The bushing includes at least one retention member that moves along the outer surface of the stem during opening and closing of the valve. The interaction between the retention member and the hump on the outer surface of the stem causes a higher friction loss during opening and closing of the valve than other portions of the outer surface.

Abstract: A backflow assembly including a housing with a passage having at least one check valve positioned therein to permit fluid flow in one direction while preventing fluid flow in the reverse direction. The check valve includes a valve head connected to a stem having an outer surface. A hump extends radially outward from the outer surface of the stem. The stem is guided by a bushing during opening and closing of the valve. The bushing includes at least one retention member that moves along the outer surface of the stem during opening and closing of the valve. The interaction between the retention member and the hump on the outer surface of the stem causes a higher friction loss during opening and closing of the valve than other portions of the outer surface.

Abstract: A ball check valve comprises a housing having walls defining a fluid inlet, a fluid outlet, and a chamber communicating with the inlet and with the outlet. The ball check valve includes a spherical hollow ball housing a plurality of spherical shock absorbing members that stabilize the spherical hollow ball during operation of the valve. The spherical hollow ball moves between a first, flow impeding position adjacent the inlet and a second position spaced from the inlet laterally of a fluid passageway in the chamber.

Abstract: A check valve comprises a casing having a flange extending circumferentially around the inner periphery of the body. The flange defines a valve aperture for receiving a poppet valve. The poppet valve includes a stem including a plurality of legs each having an outer peripheral surface facing the inner surface of the flange. The outer peripheral surface of the legs having a first section in close proximity to the inner surface of the flange and a second section recessed or cut back from the first section. The second section defines a flow path to allow debris to pass through the valve between the outer peripheral surface and the inner surface of the flange during operation.