Spring biased check valve for pipe branches

Claim 2

A non-return valve assembly for fluids comprising a valve housing having a seat and at least one conduit having an inlet and outlet passage; a flap rotatably arranged in the valve housing and having a pair of lugs, the flap adapted to seal against the valve housing seat, and a shaft positioned in the valve housing so that it is on one side of the fluid flowing through the valve when the valve is in an open position, the lugs connecting the flap to the shaft and projecting perpendicularly to a plane containing the flap a distance which is greater than a perpendicular distance from the center of the shaft to an elongation of a plane tangential to the side of the conduit nearest the shaft in the valve housing, so that the flap, when open, is passed circumfluently by the fluid flowing through the valve.

Claim 3

A non-return valve as in claim 1 further including spring means on the shaft biasing the flap to a closed position with respect to the valve housing seat.

Claim 4

A non-return valve as in claim 2 where the plane of the flap in the closed position is such that any perpendicular to the plane will lie on one side of the shaft.

Claim 5

A non-return valve as in claim 3 where the valve housing has two ''''Y'''' branch-shaped inlet conduits with respective seats and a common outlet conduit, and a second flAp has a pair of lugs and is arranged to seal against the second conduit and seat, whereby the shaft is positioned between both inlet conduits in the outlet conduit and pivotably supports the lugs of both flaps.

Claim 6

A non-return valve as in claim 4 where each of the lugs have over-sized diametrical bores with respect to the diameter of the shaft to permit a loose connection with the shaft, whereby each flap when in an open position permits the fluid flowing through its respective conduit to flow circumferentially about the flap.

Claim 7

A one way flow valve assembly for controlling the flow of fluid from two inlet conduits into a single outlet conduit comprising a ''''Y''''-shaped branched valve housing having a pair of inlet conduits and a single outlet conduit, the inlet conduits forming an acute angle at their junction; seating means including a flap member for sealing each inlet conduit; a shaft positioned in the outlet conduit and between each inlet conduit adjacent their junction; a pair of lugs on each flap member having diametrically over-sized bores relative to the shaft, the shaft positioned through the bores to permit a pivotable rotation of each flap member; and a u-shaped spring connecting each flap member to the shaft for biasing the respective flap members to a sealed closed position, each flap member positioned with respect to the shaft so that a plane containing the flap member in the closed position is such that any perpendicular to the plane will lie on the same side of the shaft as the flap member, the lugs which connect each flap member to the shaft project from the plane of the flap member, a distance which is greater than a perpendicular distance form the center of the shaft to an elongation of a plane tangential to the side of the respective inlet conduit nearest the shaft whereby each flap member when in an open position permits the fluid flowing through the respective conduit to flow circumferentially about the flap member.

Claim 8

A one way flow valve assembly for controlling the flow of fluid from two inlet conduits into a single outlet conduit comprising a ''''Y''''-shaped branched valve housing having a pair of inlet conduits and a single outlet conduit, the inlet conduits forming an acute angle at their junction; seating means including a flap member for sealing each inlet conduit; a shaft positioned in the outlet conduit and between each inlet conduit adjacent their junction; a pair of lugs on each flap member having diametrically over-sized bores relative to the shaft, the shaft positioned through the bores to permit a pivotable rotation of each flap member; and a u-shaped spring connecting each flap member to the shaft for biasing the respective flap members to a sealed closed position, each flap member positioned with respect to the shaft so that a plane containing the flap member in the closed position is such that any perpendicular to the plane will lie on the same side of the shaft as the flap member, the lugs which connect each flap member to the shaft project from the plane of the flap member, a distance which is greater than a perpendicular distance form the center of the shaft to an elongation of a plane tangential to the side of the respective inlet conduit nearest the shaft whereby each flap member when in an open position permits the fluid flowing through the respective conduit to flow circumferentially about the flap member.