Subsurface well safety valve
Patent
·
OSTI ID:6374568
This paper discusses a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and cooperating with a primary cylinder which is secured to the actuating sleeve by a shiftable latch. A secondary spindle and cooperating cylinder are provided which are supplied with fluid pressure by an entirely separate line. The secondary cylinder, when moved downwardly by fluid pressure, engages the latch to effect a disconnection of the primary cylinder from the actuating sleeve and concurrently effects the connection of the secondary cylinder to the actuating sleeve. The second cylinder may thus release the primary cylinder from the actuating sleeve in any position of the primary cylinder, including the position corresponding to the fully open position of the valve head. Means are provided on the secondary cylinder for locking the cylinder against return movement when the valve head is shifted to its fully open position.
- Assignee:
- Baker Hughes Inc., Houston, TX (USA)
- Patent Number(s):
- A; US 4951753
- Application Number:
- PPN: US 7-420516
- OSTI ID:
- 6374568
- Country of Publication:
- United States
- Language:
- English
Similar Records
Valve for subterraneal wells
Subsurface well safety valve
Hydraulic valve actuating means for subsurface safety valve
Patent
·
Tue Oct 09 00:00:00 EDT 1984
·
OSTI ID:6395972
Subsurface well safety valve
Patent
·
Mon Jan 09 23:00:00 EST 1989
·
OSTI ID:6314047
Hydraulic valve actuating means for subsurface safety valve
Patent
·
Mon Jan 04 23:00:00 EST 1988
·
OSTI ID:5408925