Title:
A HYDRAULICALLY ACTUATED RECIPROCATING PUMP
Document Type and Number:
WIPO Patent Application WO/2011/150099
Kind Code:
A3
Abstract:
A hydraulically driven reciprocating pump. In some embodiments, the pump includes a housing including a hydraulic chamber, a cylinder coupled to the housing, a piston assembly adapted for reciprocal motion within the housing and the cylinder, the piston assembly separating the hydraulic chamber into three subchambers, and a hydraulic system fluidicly coupled to each of the subchambers. The hydraulic system is actuatable to deliver hydraulic fluid to a first of the subchambers, whereby the piston assembly strokes back and a working fluid is drawn into the cylinder, to deliver hydraulic fluid to a second of the subchambers, whereby the piston assembly strokes out and the working fluid is exhausted from the cylinder, and to adjust a volume of hydraulic fluid within a third of the subchambers, whereby the piston assembly translates to bring a pressure of the working fluid in the cylinder to within a pre-selected range.
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Inventors:
MARICA ADRIAN (US)
Application Number:
PCT/US2011/037958
Publication Date:
March 29, 2012
Filing Date:
May 25, 2011
Export Citation:
Assignee:
NAT OILWELL VARCO LP (US)
MARICA ADRIAN (US)
MARICA ADRIAN (US)
International Classes:
F04B9/08; F04B13/00; F04B39/00; F04B39/12
Foreign References:
| US20020071771A1 | 2002-06-13 | |||
| US4386888A | 1983-06-07 | |||
| US4880363A | 1989-11-14 | |||
| US20020106292A1 | 2002-08-08 |
Other References:
See also references of EP 2577063A4
Attorney, Agent or Firm:
MOSCICKI, Matthew R. et al. (P.C.P. O. Box 326, Houston Texas, US)
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