Claims
- 1. An electromagnetic ram location device for a well head blowout preventer, comprising
- a ram housing having a vertical bore to receive a well pipe and opposed guideways extending from the bore,
- rams reciprocal within the respective guideways for opening and closing the vertical bore,
- movable hydraulic pistons connected for positioning the respective rams, said pistons being located within an extension of said ram housing, and
- electromagnetic induction instrumentation operably connected without being invasive of said ram housing to one of said pistons for absolutely determining its location as it closes and opens.
- 2. An electromagnetic ram location device in accordance with claim 1, wherein said electromagnetic instrumentation includes a sensor for directly continuously sensing the position of said one of said pistons.
- 3. An electromagnetic ram location device in accordance with claim 2, wherein a portion of said sensor is located within said ram housing extension and is operably reciprocal with said one of said pistons.
- 4. An electromagnetic ram location device in accordance with claim 1, wherein a first portion of said sensor is located within said ram housing and is operably reciprocal with said one of said pistons and a second portion of said sensor is located external to said ram housing.
Parent Case Info
This application is a continuation of application Ser. No. 08/192,405filed Aug. 2, 1993, U.S. Pat. No. 5,320,325.
US Referenced Citations (4)
Non-Patent Literature Citations (1)
Entry |
Understanding magnetostrictive LDTs, An introduction to magnetostritive linear displacement tranducers--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. |
Continuations (2)
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Number |
Date |
Country |
Parent |
192405 |
Feb 1994 |
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Parent |
100729 |
Aug 1993 |
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