Fike Corporation

Daniel G O'Halloran

John A Barton

Bradford T Stilwell

Donald R Hibler, Jr

Michael D Krebill

Mark Burris

Jeromie T Farnsworth

Joel Wicoff

This invention relates to a cylindrical holder member for a bi-directional bulged rupture disc. The support body of the holder has a rim that supports the rupture disc with the concave surface of the disc facing the holder. The support body is provided with a unitary one-piece, centrally creased cutting element that is of generally V-shaped configuration in plan view. The cutting element has a pair of elongated converging leg components with each leg component being connected to and supported by the interior wall surface of the holder body, with each leg component having an arcuate cutting edge. The cutting edges of the leg components merge at the crease in the cutting element to define a central cutting edge peak section. The cutting element is positioned in the holder with the cutting edge peak section extending beyond the rim of the support body into the concave area of the disc. The V-shaped cutting element functions to provide for a fuller and more rapid opening of the disc upon reversal and engagement with the cutting element as compared with prior reverse buckling disc three-knife blade cutter units. The invention has especial utility in food, beverage, and pharmaceutical applications requiring sanitary pressure relief rupture disc structure.

Holder with V-knife blade for bi-directional rupture disc assembly

An oil well completion tool having a tubular assembly defining an elongated main passage is adapted to be connected to a multiple-section tubing string within an oil well casing. A severable plug is mounted in the tubular assembly in normal blocking relationship to the passage. A movable shear cylinder unit has a plug-severing edge operable to sever an entire central segment of the plug from a remaining peripheral portion thereof. Separate hinge structure has an elongated U-shaped leg portion connected to the central segment of the plug. The leg portion of the hinge structure, which undergoes elongation, is operable to retain the severed central segment of the plug in the main passage while allowing the central segment of the plug to bodily shift independent of and in a direction away from the peripheral portion of the plug. The severed central segment is received in a recess therefor in the tubular assembly wall structure in order to prevent interference of the severed central plug segment with the main passage.

Oil well completion tool having severable tubing string barrier disc

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Oak Grove, MO, United States of America

Daniel G O'Halloran