Flap valve
AssigneeSimon-Hartley Limited
InventorsFrederick B. Gardner, Eric P. Austin
Life of this patent
Estimating the term…
Abstract
A flap valve comprising an annular frame (10) defining an opening (11) through which liquid may flow in one direction, a closure flap (14) for said opening connected to the frame (10) by a hinge member (15), and a valve seat (12) against which the closure flap (14) may close to prevent reverse flow of liquid through the opening. The frame (10) may be bolted (at 18) to a wall or pipe flange, with integral sealing ribs (24, 25) on the rear face of the frame avoiding the need for a separate gasket. The entire assembly comprising frame, closure flap, hinge, valve seat and sealing ribs, is integrally moulded from a plastics material and is reinforced where appropriate by embedded steel plates (19, 20 and 21).
Claims6
A flap valve, comprising:
- a frame defining an opening through which liquid may flow in one direction;
- a closure flap for said opening, the closure flap being joined to the frame by a hinge member, said hinge member including a first part extending forwardly from the frame and a second part substantially normal with the first part and extending coplanar with the closure flap, the first part having a reinforcing plate embedded therewithin;
- a valve seat around said opening against which the closure flap is closable to prevent the flow of liquid through the opening in an opposite direction;
- and
- reinforcement plates embedded in the flap and frame, to render said flap and frame substantially non-flexible wherein the frame, closure flap, hinge and valve seat form an integral assembly made of plastic material.
A flap valve, comprising:
- a frame defining an opening through which liquid may flow in one direction;
- a closure flap for said opening, the closure flap being joined to the frame by a hinge member;
- p1 a valve seat around said opening against which the closure flap is closable to prevent the flow of liquid through the opening in an opposite direction;
- reinforcement plates embedded in the flap and frame, to render said flap and frame substantially non-flexible wherein the frame, closure flap, hinge and valve seat form an integral assembly made of plastic material;
- and
- integrally moulded reinforcing fillets to strengthen the assembly in the region of the hinge area.
Dependencies are inferred from the claim text.