Combination flow control valve and reverse flow check valve
First Claim
1. A combination flow control valve and reverse flow check valve comprising:
- a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end, wherein said housing includes a circumferentially-extending shoulder extending radially inwardly in the channel between an shiftable valve element and an check element, the shoulder defining a substantially circular opening presenting a seat for the check element, the seat having a first diameter;
the shiftable valve element positioned within the housing for controlling the flow of liquid through the channel;
the check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow for inhibiting backflow of liquid through the channel and past the shiftable valve element; and
a check element retainer located proximate the desired downstream end of the housing and positioned in the channel for maintaining the check element in the housing.
11 Assignments
0 Petitions
Accused Products
Abstract
A combination flow control and reverse flow check valve controls the flow of fluid in a desired downstream direction and limits undesired backflow of liquid in an upstream direction into a fluid source such as a reservoir. The flow control and reverse flow check valve may include a housing having a fluid conveying channel with an upstream end configured for mounting to the liquid source and a downstream end for discharging fluids, a flow control valve positioned between the ends, and a check element positioned in the channel between the flow control valve and the downstream end. The check element is advantageously positioned between the flow control valve and the downstream end of the housing to prevent possible contaminants in a backflow liquid from reaching the flow control valve.
20 Citations
18 Claims
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1. A combination flow control valve and reverse flow check valve comprising:
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a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end, wherein said housing includes a circumferentially-extending shoulder extending radially inwardly in the channel between an shiftable valve element and an check element, the shoulder defining a substantially circular opening presenting a seat for the check element, the seat having a first diameter; the shiftable valve element positioned within the housing for controlling the flow of liquid through the channel; the check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow for inhibiting backflow of liquid through the channel and past the shiftable valve element; and a check element retainer located proximate the desired downstream end of the housing and positioned in the channel for maintaining the check element in the housing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combination flow control valve and reverse flow check valve comprising:
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a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end; a shiftable valve element positioned within the housing for controlling the flow of liquid through the channel; and a check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow for inhibiting backflow of liquid through the channel and past the shiftable valve element, wherein said check element is substantially spherical.
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8. A combination flow control valve and reverse flow check valve comprising:
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a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end, the housing including a circumferentially-extending shoulder extending radially inwardly in the channel, the shoulder defining a substantially circular opening presenting a seat, the seat having a first diameter; a shiftable valve element positioned within the housing for controlling the flow of liquid through the channel; a spherical check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow and configured for engaging the seat for inhibiting backflow of liquid through the channel and past the shiftable valve element; and a check element retainer located proximate the desired downstream outlet end of the housing and positioned in the channel for maintaining the spherical check element in the housing. - View Dependent Claims (9, 10, 11, 12)
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13. A reservoir for holding fluid, the reservoir comprising:
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a tubulation adapted to discharge fluid from the reservoir; and a combination flow control valve and reverse flow check valve mounted to the tubulation, the combination flow control and reverse flow check valve including; a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end; a shiftable valve element positioned within the housing for controlling the flow of liquid through the channel; and a check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow for inhibiting backflow of liquid through the channel and past the shiftable valve element. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification