Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent
1993-08-02
1994-06-14
Fox, John C.
Valves and valve actuation
Blow-out preventers
Radial reciprocating ram
92 5R, 32420713, E21B 3306
Patent
active
053203259
ABSTRACT:
A ram of a ram-type blowout preventer is enclosed within an enclosure so that the piston driving the ram is placed parallel to a stationary magnetizable waveguide tube. A transverse ring-like magnet assembly surrounds the tube and is attached to a carrier that, in turn, is attached to the tail of the piston. The magnet assembly longitudinally magnetizes an area of the tube where it is located. A wire running through the tube is periodically interrogated with an electrical current pulse, which produces a toroidal magnetic field about the wire. When the toroidal field intersects with the longitudinally magnetized area, a magnetostrictive acoustical return pulse is reflected back up the tube for detection by a transducer located outside of the enclosure. The time that the acoustical pulse travels from the magnetic field intersection compared to the timing of the electrical pulse on the wire is a measure of distance since the pulse time essentially travels at the speed of light. Thus, the position of the ram is absolutely determined. From the position information from successive pulses, ram velocity and acceleration information can be developed. The measurements are continuous and absolute and are not incremental.
REFERENCES:
patent: 5150049 (1992-09-01), Schuetz
Understanding magnetostrictive LDTs, An introduction to magnetostritive linear displacement transducers-the most popular means of producing an electric signal corresponding to cylinder position in fluid power systems, W. D. Peterson, Feb. 1993 from Hydraulics & Pneumatics magazine, pp. 32-34.
Colvin Kenneth W.
Frederick Joseph L.
Young Kenneth D.
Fox John C.
Hydril Company
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