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US 4,381,822 AGranted
Landing nipple
AssigneeOtis Engineering Corporation
InventorErnest P. Fisher, Jr.
Life of this patent
Estimating the term…
Abstract
A landing nipple having a port through the wall thereof which is controlled by a valve carried by a non-circular ring which ring may be moved toward circular position by introduction of a sleeve-like member into the bore through the ring to unseat the valve.
Claims8
A landing nipple comprising,
- a tubular body having a bore therethrough,
- a port extending through the wall of the body,
- a valve seat in said port,
- an elastic ring in the bore through the body,
- a first valve member carried by the ring and cooperable with the valve seat to control flow through the port,
- means on said ring and body preventing relative rotation of said ring and body and maintaining their axes substantially parallel and said valve member positioned to cooperate with said seat,
- said ring when unstressed being non-circular in shape and dimensioned relative to the body to be slightly bent by the body with the valve member held against its seat by the elasticity of the ring,
- said ring bendable toward a circular configuration to unseat said valve member.
5 more elements
A landing nipple comprising,
- a tubular body having a bore therethrough,
- an internal annular groove in the body,
- a port between the groove and the exterior of the body,
- a valve seat in said port,
- an elastic ring in said groove,
- means preventing relative rotation of said ring and body,
- a first valve member on the ring cooperable with said valve seat to control flow through said port,
- said ring when unstressed being oval in shape with the valve member at approximately the maximum diameter of the ring,
- said ring dimensioned relative to the groove to be slightly bent by the body toward a circular configuration with the elasticity of the ring holding said valve member on said valve seat,
- said ring bendable toward a circular configuration to unseat said valve member without stressing said ring beyond its elastic limits.
7 more elements
Dependencies are inferred from the claim text.