VENTURI VACUUM DRAWBACK ASSEMBLIES AND DUAL ORIFICE VENTURI VALVE ASSEMBLIES
First Claim
1. A venturi vacuum drawback assembly for controlling a flow of a fluid from a device, the venturi vacuum drawback assembly comprising:
- a fluid supply passage that supplies the fluid to the device;
a fluid return passage that returns the fluid from the device;
a shutoff valve positioned on the fluid supply passage;
a bypass passage includes an inlet and an outlet, the inlet connected to the fluid supply passage upstream of the shutoff valve, and the outlet connected to the fluid return passage;
a bypass valve positioned on the bypass passage; and
a venturi valve positioned on the bypass passage upstream of the bypass valve, the venturi valve includes a venturi inlet, a venturi outlet, and a primary orifice positioned between the venturi inlet and the venturi outlet, the primary orifice is connected to a drawback opening on the fluid supply passage by a conduit, the drawback opening of the fluid supply passage is positioned downstream of the shutoff valve.
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Accused Products
Abstract
A venturi vacuum drawback assembly includes a fluid supply passage that supplies the fluid to the device, a fluid return passage that returns the fluid to the device, a shutoff valve positioned on the fluid supply passage, a bypass passage, a bypass valve positioned on the bypass passage, and a venturi valve positioned on the bypass passage downstream of the bypass valve. The bypass passage includes an inlet and an outlet. The inlet is connected to the fluid supply passage upstream of the shutoff valve, and the outlet connected to the fluid return passage. The venturi valve includes a venturi inlet, a venturi outlet, and a primary orifice positioned between the venturi inlet and the venturi outlet. The primary orifice is connected to a drawback opening on the fluid supply passage by a conduit. The drawback opening of the fluid supply passage is positioned downstream of the shutoff valve.
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Citations
20 Claims
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1. A venturi vacuum drawback assembly for controlling a flow of a fluid from a device, the venturi vacuum drawback assembly comprising:
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a fluid supply passage that supplies the fluid to the device; a fluid return passage that returns the fluid from the device; a shutoff valve positioned on the fluid supply passage; a bypass passage includes an inlet and an outlet, the inlet connected to the fluid supply passage upstream of the shutoff valve, and the outlet connected to the fluid return passage; a bypass valve positioned on the bypass passage; and a venturi valve positioned on the bypass passage upstream of the bypass valve, the venturi valve includes a venturi inlet, a venturi outlet, and a primary orifice positioned between the venturi inlet and the venturi outlet, the primary orifice is connected to a drawback opening on the fluid supply passage by a conduit, the drawback opening of the fluid supply passage is positioned downstream of the shutoff valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A venturi vacuum drawback assembly for controlling a flow of a fluid from a device, the venturi vacuum drawback assembly comprising:
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a primary fluid supply passage that supplies the fluid to the device; a primary fluid return passage that returns the fluid from the device; a primary shutoff valve positioned on the primary fluid supply passage; a secondary fluid supply passage that supplies the fluid to the device; a secondary fluid return passage that returns the fluid from the device; a secondary shutoff valve positioned on the secondary fluid supply passage; a bypass passage includes an inlet and an outlet, the inlet connected to the primary fluid supply passage upstream of the primary shutoff valve, and the outlet connected to the primary fluid return passage; a bypass valve positioned on the bypass passage; and a venturi valve positioned on the bypass passage upstream of the bypass valve, the venturi valve includes a venturi inlet, a venturi outlet, a primary orifice positioned between the venturi inlet and the venturi outlet, and a secondary orifice positioned between the venturi inlet and the venturi outlet, the primary orifice is connected to a primary drawback opening on the primary fluid supply passage by a primary conduit, the primary drawback opening of the primary fluid supply passage is positioned downstream of the primary shutoff valve, the secondary orifice is connected to a secondary drawback opening on the secondary fluid supply passage by a secondary conduit, the secondary drawback opening of the secondary fluid supply passage is positioned downstream of the secondary shutoff valve. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A dual orifice venturi valve assembly comprising:
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a venturi valve that includes a venturi inlet, a venturi outlet, a first constricted portion, and a second constricted portion, the first constricted portion and the second constricted portion are positioned between the venturi inlet and the venturi outlet, the first constricted portion includes a primary orifice and a secondary orifice, the first constricted portion includes an inlet orifice having an inlet diameter at a junction between the first constricted portion and the second constricted portion, the first constricted portion includes an outlet orifice having an outlet diameter that is greater than the inlet diameter, wherein an area of the outlet orifice is equal to or less than a sum of an area of the inlet orifice, an area of the primary orifice, and an area of the secondary orifice diameter. - View Dependent Claims (19, 20)
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Specification