IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0648101
(1984-09-07)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Bethlehem Steel Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
2 |
초록
▼
A fail-closed gas safety valve system for blast furnace stove operations employing two tight seal butterfly valves, one a gas shutoff valve and the other a gas regulating valve, which together operate to prevent the leakage of hazardous gas into a blast furnace stove area in the event the supply of
A fail-closed gas safety valve system for blast furnace stove operations employing two tight seal butterfly valves, one a gas shutoff valve and the other a gas regulating valve, which together operate to prevent the leakage of hazardous gas into a blast furnace stove area in the event the supply of air to the stove is interrupted because of a power or a hydraulic failure.
대표청구항
▼
1. A fail-closed, tight seal gas safety valve system for blast furnace stove operations comprising: (a) An elastic-seated tight seal butterfly valve which is actuated by a single acting cylinder controlled by a solenoid valve, the operation of said tight seal butterfly valve being such that when
1. A fail-closed, tight seal gas safety valve system for blast furnace stove operations comprising: (a) An elastic-seated tight seal butterfly valve which is actuated by a single acting cylinder controlled by a solenoid valve, the operation of said tight seal butterfly valve being such that when carbon monoxide is being burned in a blast furnace stove, the solenoid on said solenoid valve is energized, thereby allowing fluid to be pumped from a fluid reservoir through said solenoid valve into said cylinder, whereupon the piston in said cylinder will move upward causing said tight seal butterfly valve to open and allowing gas to flow from the furnace to the burner passageway, and the operation of said tight seal butterfly valve being such that in the event of a power failure, said solenoid on said solenoid valve will de-energize, thereby preventing fluid from flowing to said cylinder and allowing fluid to drain out of said cylinder, whereupon said piston will retract and a counterweight attached to and acting in conjunction with a progressively increasing leverage linkage system consisting of two pivotally-connected levers, one of which is attached to said shutoff valve via a third lever, the other of which is attached to said cylinder and carries said counterweight, will cause said butterfly valve to fail-closed, thereby shutting off the flow of gas from the furnace to the burner passageway and preventing the leakage of carbon monoxide gas into the stove, and the operation of said butterfly valve being such that in the event of a hydraulic failure, fluid will drain out of said cylinder causing said piston to retract and said butterfly valve to fail-closed because of the above-described counterweight and linkage system; and (b) A second elastic-seated tight seal butterfly valve which is actuated by a double acting cylinder operating in conjunction with a spring-closed two-way solenoid valve and a servovalve which controls said double acting cylinder, the operation of the said second butterfly valve being such that when carbon monoxide is being burned in the blast furnace stove, the solenoid on said solenoid valve and the balancing coils of said servovalve are energized causing said solenoid valve to close and allowing fluid to be pumped from the fluid reservoir through said servovalve into said cylinder, with the flow of the fluid being modulated by said servovalve, whereupon the piston in said cylinder will move upward allowing said second butterfly valve to regulate the amount of gas flow into the blast furnace stove, and the operation of said second butterfly valve being such that in the event of a power failure, said solenoid on said solenoid valve and said balancing coils of said servovalve will de-energize causing said solenoid valve to open, said servovalve to cease modulating fluid flow, and fluid to flow from the closed end of said cylinder to the rod end of said cylinder, thereby forcing said second butterfly valve to fail-closed with the aid of a counterweight and a linkage system in the same manner as described above for said butterfly valve of claim 1(a), whereupon said second butterfly valve will cease regulating the amount of gas flow in the blast furnace stove and prevent the leakage of carbon monoxide gas into the stove area, and the operation of said second butterfly valve being such that in the event of a hydraulic failure, said valve will fail-closed in the same manner in which it fail-closes in the event of a power failure as described above. 2. A fail-closed tight seal gas safety valve system for blast furnace stove operations comprising an elastic-seated tight seal butterfly valve actuated by a double acting cylinder operating in conjunction with a spring-closed two-way solenoid valve and a servovalve which controls said double acting cylinder the operation of said butterfly valve being such that when carbon monoxide is being burned in the blast furnace stove, the solenoid on said solenoid valve and the balancing coils of said servovalve are energized causing said solenoid valve to close and allowing fluid to be pumped from a fluid reservoir through said servovalve into said cylinder, with the flow of the fluid being modulated by said servovalve, whereupon the piston in said cylinder will move upward allowing gas to flow from the furnace through said butterfly valve to the burner passageway and also allowing said butterfly valve to regulate the amount of gas flow into the blast furnace stove, and the operation of said butterfly valve being such that in the event of a power failure, said solenoid on said solenoid valve and said balancing coils of said servovalve will de-energize causing said solenoid valve to open, said servovalve to cease modulating fluid flow, and fluid to flow from the closed end of said cylinder to the rod end of said cylinder, thereby forcing the piston in said cylinder to retract and said butterfly valve to fail-closed with the aid of a counterweight attached to and acting in conjunction with a progressively increasing leverage linkage system consisting of two pivotally-connected levers, one of which is attached to said shutoff valve via a third lever, other of which is attached to said cylinder and carries said counterweight, whereupon such fail closure said butterfly valve will shut off the flow of gas from the furnace to the burner passageway, cease regulating the amount of gas flow in the blast furnace stove, and prevent the leakage of carbon monoxide gas into the stove area, and the operation of said butterfly valve being such that in the event of a hydraulic failure, said butterfly valve will fail-closed in the same manner in which it fail-closes in the event of a power failure as described above.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.