Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Reexamination Certificate
2007-02-16
2010-11-16
Fristoe, Jr., John K (Department: 3753)
Valves and valve actuation
Blow-out preventers
Radial reciprocating ram
C251S001100, C166S085400
Reexamination Certificate
active
07832706
ABSTRACT:
A ram-type blowout preventer includes a pair of ram assemblies adapted for controlled lateral movement to and from a vertical bore. Each ram assembly has a hydraulic piston connected at a first end to a ram block and at a second end to a piston tail. A magnetostrictive waveguide tube extends into a bore of at least one piston tail and a permanent magnet is disposed upon the at least one piston tail. The magnetostrictive waveguide tube has a conducting wire to receive an interrogation pulse from a transducer, the interrogation pulse generates a helical return signal in response to a relative position of the permanent magnet with respect to the waveguide tube, and the transducer is configured to receive the helical return signal and output a position of the ram block corresponding to the at least one piston tail.
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Fristoe, Jr. John K
Hydrill USA Manufacturing LLC
Potomac Patent Group PLLC
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