US 2014/0150893 A1Published application

Shutoff valve in backflow prevention device

OwnerDouglas Hunter Powellinventor

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Abstract

A backflow prevention device including an upstream shutoff valve configured to allow a user to control the water flow stream through the housing. The upstream shutoff valve includes an obstruction. The obstruction is configured to prevent water flow at a first position and allow water flow at a second position. The obstruction is also configured to rotate about an axis of rotation between the first position and the second position. The upstream shutoff valve also includes a seal. The seal is configured to sealingly engage a sealing surface in the housing at the first position. All points of engagement between the obstruction seal and the sealing surface are located downstream of the axis of rotation of the obstruction.

Claims19

Dependent claims

A backflow prevention device, the backflow prevention device comprising:

a housing defining a water flow stream;
an upstream shutoff valve, wherein the upstream shutoff valve:
is configured to allow a user to control the water flow stream through the housing;
and
includes an obstruction, wherein the obstruction:
is configured to:
prevent water flow at a first position;
allow water flow at a second position;
and
rotate about an axis of rotation between the first position and the second position;
and
includes a seal, wherein the seal is:
configured to sealingly engage a sealing surface in the housing at the first position;
and
wherein all points of engagement between the obstruction seal and the sealing surface are located downstream of the axis of rotation of the obstruction;
an upstream check valve:
located within the housing downstream of the upstream shutoff valve;
and
including:
an orifice, wherein the orifice is configured to allow the water flow stream through the upstream check valve;
and
a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open;
and
prevent the water flow stream through the orifice when in a closed position by mating with the orifice;
a downstream check valve:
located within the housing downstream of the upstream check valve;
and
including:
an orifice, wherein the orifice is configured to allow the water flow stream through the downstream check valve;
a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open;
and
prevent the water flow stream through the orifice when in a closed position by mating with the orifice;
and
a downstream shutoff valve, wherein the downstream shutoff valve is configured to allow a user to control the water flow stream through the housing.

33 more elements

A backflow prevention device, the backflow prevention device comprising:

a housing defining a water flow stream;
an upstream shutoff valve, wherein the upstream shutoff valve:
is configured to allow a user to control the water flow stream through the housing;
and
includes a disk, wherein the disk:
is configured to:
prevent water flow at a first position;
allow water flow at a second position;
and
rotate about an axis of rotation between the first position and the second position;
and
includes a seal, wherein the seal is:
configured to sealingly engage a sealing surface in the housing at the first position;
and
wherein all points of engagement between the disk seal and the sealing surface are located downstream of the axis of rotation of the disk;
an upstream check valve:
located within the housing downstream of the upstream shutoff valve;
and
including:
a seat configured to mate with a portion of the housing;
an orifice, wherein the orifice is configured to allow the water flow stream through the upstream check valve;
and
a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open;
and
prevent the water flow stream through the orifice when in a closed position by mating with the orifice;
a downstream check valve:
located within the housing downstream of the upstream check valve;
and
including:
a seat configured to mate with a portion of the housing;
an orifice, wherein the orifice is configured to allow the water flow stream through the downstream check valve;
a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open;
and
prevent the water flow stream through the orifice when in a closed position by mating with the orifice;
and
a downstream shutoff valve, wherein the downstream shutoff valve is configured to allow a user to control the water flow stream through the housing.

35 more elements

A backflow prevention device, the backflow prevention device comprising:

a housing defining a water flow stream;
an upstream shutoff valve, wherein the upstream shutoff valve:
is configured to allow a user to control the water flow stream through the housing;
and
includes a disk, wherein the disk:
is configured to:
prevent water flow at a first position;
allow water flow at a second position;
and
rotate about an axis of rotation between the first position and the second position;
and
includes a spherical segment, wherein the spherical segment includes the spherical segment of a sphere with a diameter that is concurrent with an axis with the shaft of the upstream shutoff valve;
and
includes a seal, wherein the seal is:
configured to sealingly engage a sealing surface in the housing at the first position;
and
wherein all points of engagement between the disk seal and the sealing surface are located downstream of the axis of rotation of the disk;
an upstream check valve:
located within the housing downstream of the upstream shutoff valve;
and
including:
a seat configured to mate with a portion of the housing;
an orifice, wherein the orifice is configured to allow the water flow stream through the upstream check valve;
and
a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open;
and
prevent the water flow stream through the orifice when in a closed position by mating with the orifice;
a downstream check valve:
located within the housing downstream of the upstream check valve;
and
including:
a seat configured to mate with a portion of the housing;
an orifice, wherein the orifice is configured to allow the water flow stream through the downstream check valve;
a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open;
and
prevent the water flow stream through the orifice when in a closed position by mating with the orifice;
and
a downstream shutoff valve, wherein the downstream shutoff valve is configured to allow a user to control the water flow stream through the housing.

37 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/705,033Filed 4 Dec 2012
Published: 5 Jun 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16K 15/182
With actuating mechanism; Combined check valves and actuated valves: with actuating mechanism
F16K 15/033
With a hinged closure member or with a pivoted closure member: spring-loaded
F16K 15/035
With a hinged closure member or with a pivoted closure member: with a plurality of valve members
Y10T 137/3294
Air vent in liquid flow line: valved

Family

US 8,887,756 B2Related patent
US 2014/0150893 A1This patent

From the US filing history. Foreign family members aren’t listed.

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