High speed, high temperature three-way valve for switching high pressure fluids under low pressure control
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0942566
(1986-12-16)
|
발명자
/ 주소 |
- Barree Robert D. (Littleton CO)
|
출원인 / 주소 |
- Marathon Oil Company (Findlay OH 02)
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
0 |
초록
Disclosed is a low internal volumn three-way valve for high speed switching of high pressure, high temperature fluids without volume change. Such valves have particular application with positive displacement pumps for precision laboratory measurements wherein corrosive fluids are used.
대표청구항
▼
In combination with a fluid supply, first and second fluid receivers, a low pressure control system, and a high speed three-way valve for switching high temperature, high pressure fluids from said fluid supply under low pressure control by said control system to one of said two fluid receivers, said
In combination with a fluid supply, first and second fluid receivers, a low pressure control system, and a high speed three-way valve for switching high temperature, high pressure fluids from said fluid supply under low pressure control by said control system to one of said two fluid receivers, said three-way valve comprising: a valve body composed of material capable of withstanding said high temperature and said high pressure without deformation, said body having a formed input port connected to said fluid supply and first and second formed output ports, said first output port being connected to said first fluid receiver and said second output port being connected to said second fluid receiver, a cavity formed in said valve body and in fluid communication with said formed input and said formed first and second output ports, said cavity being of elongated symmetrical shape having a formed central cylindrical region of larger radius and first and second opposing elongated cylindrical regions, the radius of said central region being greater than the radius of said opposing first and second elongated cylindrical regions, said formed input port being in fluid communication in the center of said formed central cylindrical region, said first output port being in fluid communication near the end of said first elongated cylindrical region and said second output port being in fluid communication near the end of said second elongated cylindrical region, the transitions between said central cylindrical region and said opposite elongated cylindrical regions forming first and second valve seats, an elongated symmetrical spool disposed within said formed cavity in said valve body and comprised of material capable of withstanding said high temperature and said high pressure without doformation, said spool having a central raised portion and first and second opposing elongated cylindrical shafts, the radius of said central raised portion being slightly less than the radius of said central cylindrical region of said cavity, the radius of said first and second opposing elongated cylindrical shafts being slightly less than the radius of said first and second opposing elongated cylindrical regions, the transitions between said central raised portion of said spool and said first and second opposing shafts forming first and second conical shaped spool seats, said spool cooperating with said valve body to form a first fluid passageway between said formed input port and said first output port when said first spool seat seals against said first valve seat and to form a second fluid passageway between said formed input port and said second output port when said second spool seat seals against said second valve seat, first and second opposing pistons connected to opposite ends of said valve body and to said control system, said first piston engaging to the end of said first elongated cylindrical shaft of said spool and said second piston engaging to the end of said second elongated cylindrical shaft of said spool, means located in said valve body and around said first and second opposing elongated cylindrical shafts for sealing said high temperature, high pressure fluid in said first and second formed passageways, said first piston being responsive to a low pressure signal from said control system for driving said spool towards said second valve seat so as to firmly engage said second spool seat against said second valve seat to seal said high pressure, high temperature fluid in said first passageway for delivery to said second outlet port, and said second piston being responsive to a low pressure signal from said control system for driving said spool towards said first valve seat so as to firmly engage said first spool seat against said first valve seat to seal said high pressure, high temperature fluid in said second passageway for delivery to said second outlet port, said sealing of said spool against said first and second valve seals being made under said high pressure and said high temperature without internal volume change in said valve.
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