Shear relief valve

Details Shear relief valve Shear relief valve

1980-12-09

1982-11-16

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Destructible element

166313, 166319, 137 70, 137797, E21B 2308, E21B 3408, E21B 4312

Patent

active

043590942

ABSTRACT:
A relief valve for use particularly for isolating and for permitting communication between flow passages in a well bore which may include parallel tubing strings connected by an H-Member and a single tubing string and a tubing-casing annulus which communicate through a side-pocket mandrel. The valve has a tubular housing having a lower open end and connected at an upper end with a packing mandrel provided with an annular packing assembly for sealing with a bore wall around the valve, a valve stem telescoping along an upper portion into the housing and extending along a lower end portion from the housing, shear screws between the valve stem and the housing for locking the valve stem at a lower valve-closed position, a plurality of spaced locking flanges along the stem and a lock ring within the housing operable with the flanges for locking the stem at a plurality of second valve open positions, a valve assembly on the lower end of the stem having an external annular seal for engaging a seal surface around the valve assembly at a valve-closed position of the stem and valve assembly, shear means between the valve assembly seal and a core portion of the assembly for emergency release of the seal, and the valve stem being sized in length to engage a stop surface in the housing at a valve open position to limit movement of the valve assembly toward the housing to prevent damage to the valve assembly.

REFERENCES:
patent: 2092793 (1937-09-01), Abercrombie
patent: 2092819 (1937-09-01), Tennant
patent: 3363693 (1968-01-01), Bohlmann, Jr.
patent: 3381753 (1968-05-01), Fredd
patent: 3666012 (1972-05-01), Sizer et al.

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