Title: Safety valve

Abstract: A manually operated valve. The valve has a housing with a uniform outside diameter compatible with the outside diameter of flow conductors attached to the valve. An operating sleeve is movable longitudinally within the housing by engagement with a shifting tool from the exterior of the housing. The operating sleeve shifts the valve between its open and closed positions. A detent spring is provided to give an indication when the shifting tool has moved the operating sleeve sufficient to fully open or close the valve. The valve is particularly adapted for using in a drill string or workover string in an oil or gas well.

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Inventors: Kohn, Gary A. (Dallas, TX)

Application Number: 06/332927
Filing Date: 1981-12-21
Publication_date: 1983-11-29
Assignee: OTIS ENG CO (US)

Primary Class(es): 137/553 251/231, 175/218, 251/292, 166/332.400
Other Classes: E21B21/10; E21B34/00; E21B21/00; F16K37/00; F16K31/44
US Patent Ref:
Other Refs:
Primary Examiner: Chambers, Michael A.
Assistant Examiner:
Attorney: Felger, Thomas R.

Parent Case Data:

This application is a continuation-in-part of my copending application Ser. No. 06/131,793 filed on Ma