Subsurface safety valve of minimized length
First Claim
1. A subsurface safety valve comprising:
- a tubular valve housing;
a valve closure member movable between an open and a closed position;
an axially shiftable flow tube for opening the valve closure member;
a plurality of longitudinally disposed springs approximately equally radially spaced about the housing for biasing the flow tube to a closed position; and
a piston and cylinder assembly to move the flow tube to an open position, a portion of the assembly longitudinally overlaps at least one of the springs.
1 Assignment
0 Petitions
Accused Products
Abstract
A subsurface safety valve of minimized length comprises a tubular valve housing with a valve closure member therein movable between an open and a closed position, an axially shiftable flow tube for opening the valve closure member, a plurality of longitudinally disposed springs radially spaced about the housing for biasing the flow tube to a closed position, and a piston and cylinder assembly to move the flow tube to an open position, with a portion of the assembly longitudinally overlapping at least one of the springs. The safety valve includes simple mechanisms to lock out the safety valve, and to establish secondary hydraulic communication with a wireline set secondary valve set within the locked out safety valve.
73 Citations
18 Claims
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1. A subsurface safety valve comprising:
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a tubular valve housing; a valve closure member movable between an open and a closed position; an axially shiftable flow tube for opening the valve closure member; a plurality of longitudinally disposed springs approximately equally radially spaced about the housing for biasing the flow tube to a closed position; and a piston and cylinder assembly to move the flow tube to an open position, a portion of the assembly longitudinally overlaps at least one of the springs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A subsurface safety valve comprising:
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a tubular valve housing having a longitudinal opening therethrough; a valve closure member movable between an open and a closed position to alternately permit and prevent fluid flow through the opening; an axially shiftable flow tube for opening the valve closure member; means for biasing the flow tube to a closed position; a piston and cylinder assembly to move the flow tube to an open position; and the flow tube being movable to a fully extended position where the valve closure member is locked in the open position; and shearable stops in the housing for preventing the flow tube from moving from the open position to the fully extended position until sufficient force is exerted upon the flow tube to shear the shearable stops. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A subsurface safety valve comprising:
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a tubular valve housing having a longitudinal opening therethrough; a valve closure member movable between an open and a closed position to alternately permit and prevent fluid flow through the opening; an axially shiftable flow tube for opening the valve closure member; a plurality of longitudinally disposed springs radially spaced about the housing for biasing the flow tube to a closed position; a piston and cylinder assembly to move the flow tube to an open position, a portion of the assembly longitudinally overlaps at least one of the springs; and the flow tube being movable to a fully extended position to lock the valve closure member in the open position and to open an operating fluid passage between the cylinder and the longitudinal opening.
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Specification