Gate valve with hydraulic operator
Abstract
Abstract A GATE VALVE CONSISTING OF A BODY HAVING ALIGNED FLOW PASSAGES AND A VALVE GATE WITHIN THE BODY WHICH IS MOVABLE BETWEEN OPEN AND CLOSED POSITIONS. A BLOCK OF NONMAGNETIC MATERIAL (E.G., ALUMINUM) IS MOUNTED ON ONE END OF THE BODY AND IS PROVIDED WITH A CENTRAL BORE FORMING A CYLINDER. ONE OR MORE ADDITIONAL SMALLER BORES ARE FORMED IN THE BLOCK AND SERVE TO ACCOMMODATE MAGNETICALLY OPERATED ELECTRICAL SWITCHES. A ROD CONNECTS WITH THE GATE AND EXTENDS AXIALLY THROUGH THE CYLINDRICAL BORE. A PISTON IS MOUNTED ON THE ROD AND IS SEALED WITH RESPECT TO THE SURFACE OF THE BORE. BOTH END PORTIONS OF THE BORE ARE CLOSED AND ARE ADAPTED TO BE CONNECTED WITH THE HYDRAULIC SYSTEM FOR MOVING THE PISTON IN OPPOSITE DIRECTIONS WHEREBY THE GATE IS MOVED BETWEEN FULL OPEN AND CLOSED POSITIONS. A PERMANENT MAGNET IS MOUNTED UPON THE PISTON AND ACTS THROUGH THE ADJACENT WALLS OF THE CYLINDRICAL BORE TO OPERATE THE SWITCHES.
Inventors
- 👤 Francis M Lathrop
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |