Vapor recovery liquid dispensing apparatus
First Claim
1. A liquid dispensing vapor recovery nozzle adapted for use with a vapor recovery vacuum pump which provides a source of vacuum, comprising:
- a. a nozzle body having therein a vacuum chamber, a vapor inlet passageway in communication with said vacuum chamber, a vapor outlet passageway in communication with said vacuum chamber and said vapor inlet passageway, a liquid inlet passageway, and a liquid outlet passageway, said vapor inlet and outlet passageways being sealed off from said liquid inlet and outlet passageways to thereby prevent mixing of vapor with liquid flowing in said liquid inlet and outlet passageways, and wherein said vapor outlet passagway provides an outlet from said nozzle body which is adapted to be connected to a source of vacuum to thereby draw vapors through said vapor inlet and outlet passageways to discharge the vapor from said nozzle body to the source of vacuum;
b. a flow control valve normally blocking communication of said liquid inlet and outlet passageways;
c. a manually actuated lever adapted to open said flow control valve when said lever is manually operated and provide communication of said liquid inlet and outlet passageways;
d. a liquid discharge tube in communication with said liquid outlet passageway and having a liquid exit end opening through which liquid is discharged;
e. a vapor recovery tube which is in communication with said vapor inlet passageway and having a vapor entrance end opening through which vapor is received; and
f. vacuum actuated means responsive to lower than atmospheric pressure in said vacuum chamber and operably connected to said lever for disabling said lever in response to a selected low pressure in said vacuum chamber to prevent said lever from opening said flow control valve whereby, when vapors are being withdrawn from said vapor outlet passageway by a source of vacuum, a low pressure will be developed in said vacuum chamber sufficient to actuate said vacuum actuated means when said entrance end opening of said vapor recovery tube is substantially obstructed by liquid to prevent withdrawal of liquid through said vapor recovery tube.
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Accused Products
Abstract
A liquid dispensing nozzle is provided with a liquid discharge tube and a vapor recovery tube, both of which are adapted to be inserted into the fill pipe of a tank such as a motor vehicle gasoline tank. While gasoline or other volatile liquid is discharged through the discharge tube, a substantially equal volume of vapor is withdrawn through the vapor recovery tube to a pneumatic pump portion of a hydraulic motor-pneumatic pump device. Gasoline flowing through a hydraulic motor therein drives the pneumatic pump, which is operably connected to the hydraulic motor to be driven in synchrony therewith. The volume of vapor withdrawn from the fuel tank is adjusted to be approximately equal to the volume of liquid discharged, such that the pressure inside the tank is substantially atmospheric, and the end of the fill pipe of the tank may be sealed to prevent vapor from escaping or air from being drawn into the tank. The vapor recovery tube may be in communication with a vacuum chamber within the dispensing nozzle, such that blockage of the entrance end of the vapor recovery tube would result in a vacuum developed within the vacuum chamber sufficient to actuate a vacuum responsive device, which disables the manually operated lever of the dispensing nozzle.
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Citations
23 Claims
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1. A liquid dispensing vapor recovery nozzle adapted for use with a vapor recovery vacuum pump which provides a source of vacuum, comprising:
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a. a nozzle body having therein a vacuum chamber, a vapor inlet passageway in communication with said vacuum chamber, a vapor outlet passageway in communication with said vacuum chamber and said vapor inlet passageway, a liquid inlet passageway, and a liquid outlet passageway, said vapor inlet and outlet passageways being sealed off from said liquid inlet and outlet passageways to thereby prevent mixing of vapor with liquid flowing in said liquid inlet and outlet passageways, and wherein said vapor outlet passagway provides an outlet from said nozzle body which is adapted to be connected to a source of vacuum to thereby draw vapors through said vapor inlet and outlet passageways to discharge the vapor from said nozzle body to the source of vacuum; b. a flow control valve normally blocking communication of said liquid inlet and outlet passageways; c. a manually actuated lever adapted to open said flow control valve when said lever is manually operated and provide communication of said liquid inlet and outlet passageways; d. a liquid discharge tube in communication with said liquid outlet passageway and having a liquid exit end opening through which liquid is discharged; e. a vapor recovery tube which is in communication with said vapor inlet passageway and having a vapor entrance end opening through which vapor is received; and f. vacuum actuated means responsive to lower than atmospheric pressure in said vacuum chamber and operably connected to said lever for disabling said lever in response to a selected low pressure in said vacuum chamber to prevent said lever from opening said flow control valve whereby, when vapors are being withdrawn from said vapor outlet passageway by a source of vacuum, a low pressure will be developed in said vacuum chamber sufficient to actuate said vacuum actuated means when said entrance end opening of said vapor recovery tube is substantially obstructed by liquid to prevent withdrawal of liquid through said vapor recovery tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for dispensing liquid to the fill pipe of a tank and recovering vapors from the tank, comprising:
a. a liquid dispensing nozzle having; 1. a nozzle body having therein a vacuum chamber, a vapor inlet passageway in communication with said vacuum chamber, a vapor outlet passageway in communication with said vacuum chamber and said vapor inlet passageway, a liquid inlet passage, and a liquid outlet passageway, said vapor inlet and outlet passageways being sealed off from said liquid inlet and outlet passageways to thereby prevent mixing of vapor with liquid flowing in said liquid inlet and outlet passageways, and wherein said vapor outlet passageway provides an outlet from said nozzle body which is adapted to be connected to a source of vacuum to thereby draw vapors through said vapor inlet and outlet passageways to discharge the vapor from said nozzle body to the source of vacuum; 2. a flow control valve normally blocking communication of said liquid inlet and outlet passageways, - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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11. a manually actuated lever adapted to open said flow control valve when said lever is manually operated and provide communication of said liquid inlet and outlet passageways,a liquid discharge tube in communication with said liquid outlet passageway and having a liquid exit end opening through which liquid is discharged,a vapor recovery tube which is in communication with said vapor inlet passageway and having a vapor entrance end opening through which vapor is received, andvacuum actuated means responsive to lower than atmospheric pressure in said vacuum chamber and operably connected to said lever for disabling said lever in response to a selected low pressure in said vacuum chamber to prevent said lever from opening said flow control valve, whereby, when vapors are being withdrawn from said vapor outlet passageway by a source of vacuum, a low pressure will be developed in said vacuum chamber sufficient to actuate said vacuum actuated means when said entrance end opening of said vapor recovery tube is substantially obstructed by liquid to prevent withdrawal of liquid through said vapor recovery tube;
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b. a positive displacement hydraulic motor adapted to receive liquid flowing under pressure and operably connected to the liquid inlet passageway of said liquid dispensing nozzle to provide the liquid flowing therethrough to said inlet passageway, said hydraulic motor being driven by the flow of liquid therethrough; and c. a positive displacement pneumatic pump operably connected to said hydraulic motor to be driven in synchrony therewith, said pneumatic pump having an inlet port and outlet port, said inlet port being pneumatically connected to said vapor outlet passageway to draw vapors therefrom when said pump is being driven by said hydraulic motor.
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Specification