US3929150A — Sillcock incorporating an antisiphon and backflow…

Claim 1

Independent Claim 302 words

A sillcock comprising; a barrel having an axially inner and an axially outer end portion; a first passageway extending through said barrel; connector means at the axially inner end portion of said barrel adapted for securing said barrel to a pressurized fluid supply line; a spout communicating with said first passageway; a valve stem having axially inner and axially outer end portions and extending axially within said first passageway; a second passageway extending through said valve stem opening to the atmosphere; a handle secured to the axially outer end portion of said valve stem for selectively displacing said valve stem axially between an open and a closed position while permitting said second passageway to communicate to the atmosphere; a valve seat circumscribing said first passageway within said barrel and disposed between said connector means and said spout; a piston mounted within the axially inner end portion of said valve stem so as to be movable axially between a retracted and protracted position with respect to said valve stem; a valving element mounted on said piston in opposition to said valve seat; means on said valve stem to engage said piston in its retracted position and maintain said valve element in sealing engagement with said valve seat when said valve stem is in closed position; and, biasing means acting between said valve stem and said piston continuously to urge said piston toward its protracted position to maintain said valve element in sealing engagement with said valve seat throughout the range of axial movement available to said valve stem between said open and closed positions when the pressure within said fluid supply line falls below a predetermined value thereby preventing backflow and simultaneously permiting communication between said first passageway and said second passageway to release backpressure present to the atmosphere through said second passageway.

Claim 2

Dependent Claim 302 words

A sillcock comprising; a barrel having an axially inner and an axially outer end portion; a first passageway extending through said barrel; connector means at the axially inner end portion of said barrel adapted for securing said barrel to a pressurized fluid supply line; a spout communicating with said first passageway; a valve stem having axially inner and axially outer end portions and extending axially within said first passageway; a second passageway extending through said valve stem opening to the atmosphere; a handle secured to the axially outer end portion of said valve stem for selectively displacing said valve stem axially between an open and a closed position while permitting said second passageway to communicate to the atmosphere; a valve seat circumscribing said first passageway within said barrel and disposed between said connector means and said spout; a piston mounted within the axially inner end portion of said valve stem so as to be movable axially between a retracted and protracted position with respect to said valve stem; a valving element mounted on said piston in opposition to said valve seat; means on said valve stem to engage said piston in its retracted position and maintain said valve element in sealing engagement with said valve seat when said valve stem is in closed position; and, biasing means acting between said valve stem and said piston continuously to urge said piston toward its protracted position to maintain said valve element in sealing engagement with said valve seat throughout the range of axial movement available to said valve stem between said open and closed positions when the pressure within said fluid supply line falls below a predetermined value thereby preventing backflow and simultaneously permiting communication between said first passageway and said second passageway to release backpressure present to the atmosphere through said second passageway.

Claim 3

Dependent Claim 45 words

A sillcock, as set forth in claim 1, in which said barrel and said valve stem are of sufficient axial extent that when said spout is positioned in proximity to the exterior wall of a building said valve seat is located interiorily of the building.

Claim 4

Dependent Claim 54 words

A sillcock, as set forth in claim 1, in which said valve seat comprises at least first and second axially displaced, concentric shoulders and said first valve element comprises an elastomeric body portion engaging said first shoulder and an annular, radially extending, flexible skirt engaging said second shoulder sealingly to close said first passageway.

Claim 5

Dependent Claim 76 words

A sillcock, as set forth in claim 1, said valve stem further comprising threads meshingly to engage a corresponding set of threads presented in opposition thereto from the interior of said barrel, said handle being rotatable to displace said valve stem axially with respect to said barrel by virtue of the engagement of said threads, at least one set of said threads being fluted to permit said first passageway to communicate through said meshingly engaged threads.

Claim 6

Dependent Claim 27 words

A sillcock, as set forth in claim 4, in which said piston is mounted for rotational as well as axial movement with respect to said valve stem.

Claim 7

Dependent Claim 41 words

A sillcock, as set forth in claim 1, further comprising a second valving element located down stream with respect to said first valve element to permit selective communication between said first and said second passageway, and actuated by said biasing means.

Claim 8

Dependent Claim 73 words

A sillcock, as set forth in claim 6, in which said second valve element is also supported on said piston, said second valve element closing communication between said first and second passageways when said piston is in its retracted position and opening communication between said first and second passageways when said piston is in its protracted position by action of said biasing means against a fluid line supply pressure of a predetermined value.

Claim 9

Dependent Claim 188 words

An improved sillcock comprising: a spout; a barrel having a first passageway communicating with said spout; means on said barrel opposite said spout for connecting said barrel to a fluid supply line; said barrel being of sufficient length to extend from said spout when it is mounted exteriorily of a building to a fluid supply line located within the building; a first valving mechanism mounted within said barrel, and in proximity to the fluid supply line, to control the flow of fluid through the sillcock; a valve stem extending axially within said barrel, connected to said first valving mechanism, to effect manual actuation of said first valving mechanism; a second passageway extending axially within said valve stem which opens to the atmosphere; a second valving mechanism to control communication between said first and said second passageways; and, means acting between said valve stem and said first and said second valving mechanisms to actuate said first and said second valving mechanisms in response to the pressure within the fluid supply line so as to prevent flow into the fluid supply line and relieve back pressure present to the atmosphere.

Claim 10

Dependent Claim 188 words

An improved sillcock comprising: a spout; a barrel having a first passageway communicating with said spout; means on said barrel opposite said spout for connecting said barrel to a fluid supply line; said barrel being of sufficient length to extend from said spout when it is mounted exteriorily of a building to a fluid supply line located within the building; a first valving mechanism mounted within said barrel, and in proximity to the fluid supply line, to control the flow of fluid through the sillcock; a valve stem extending axially within said barrel, connected to said first valving mechanism, to effect manual actuation of said first valving mechanism; a second passageway extending axially within said valve stem which opens to the atmosphere; a second valving mechanism to control communication between said first and said second passageways; and, means acting between said valve stem and said first and said second valving mechanisms to actuate said first and said second valving mechanisms in response to the pressure within the fluid supply line so as to prevent flow into the fluid supply line and relieve back pressure present to the atmosphere.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-12-29	1979-06-30	1979-12-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-12-29	1983-06-30	1983-12-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-12-29	1987-06-30	1987-12-30	$7700.00	Window Closed / Lapsed

Sillcock incorporating an antisiphon and backflow preventer

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