Liquid-to-gas indicator and actuator device
Abstract
Abstract S LIQUID-TO-GAS INDICATOR IS DISCLOSED WHICH, IN ONE POSITION, WILL NORMALLY FLOW LIQUID AND WILL SENSE AND RESPOND TO THE BEGINNING OF GAS FLOW BY MOVING A MECHANICAL ACTUATING MEMBER WHICH MAY OPERATE A MICROSWITCH OR OTHER OUTPUT DEVICE. WHEN INVERTED, THE DEVICE WILL NORMALLY FLOW GAS BUT WILL RESPOND TO THE BEGINNING OF LIQUID FLOW BY MOVING THE ACTUATING MEMBER AS DESCRIBED. A SPRING-LOADED CHECK VALVE IS INSTALLED IN A MAIN CONDUIT WITH A FLOAT-TYPE BALL VALVE IN A PARALLEL CONDUIT CONNECTED ACROSS THE CHECK VALVE. A PISTON IS POSITIONED IN THE WALL BETWEEN THE CONDUIT SUCH THAT IT RESPONDS TO CHANGES IN THE PRESSURE DIFFERENTIAL ACROSS THE CHECK VALVE AND THE ACTUATING MEMBER IS MOVED IN RESPONSE TO MOVEMENT OF THE PISTON. AN OPTIONAL BIASING SPRING IS PROVIDED URGING THE PISTON IN ONE DIRECTION, AND AN ADJUSTMENT SCREW IS PROVIDED FOR VARYING THE FLOW RATE OF THE PARALLEL CONDUIT.
Inventors
- 👤 Leslie J Dawes
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |