Title:
HYDRO-PNEUMATIC CYLINDER WITH ANNULUS FLUID BYPASS
Document Type and Number:
WIPO Patent Application WO/2020/076972
Kind Code:
A3
Abstract:
Systems and methods for pressure communication within a hydro-pneumatic cylinder are provided. The hydro-pneumatic cylinder generally includes a rod, a barrel coaxial to the rod, and a piston assembly disposed within the barrel and connected to the rod. The barrel is hollow to define a chamber, and the piston assembly is axially movable within the chamber to stroke the rod relative to the barrel. The hydro-pneumatic cylinder includes: a flow path formed axially through the rod of the cylinder. This flow path may allow for pressure communication between a low-pressure side of the cylinder and a pressure energized lower pin located at a distal end of the rod. The lower pin may be actuated, via this pressure communication to secure the end of the cylinder to a tension ring on a riser.
Inventors:
PRASAD NEIL (US)
HAFERNIK STEVEN (US)
HAFERNIK STEVEN (US)
Application Number:
PCT/US2019/055429
Publication Date:
August 27, 2020
Filing Date:
October 09, 2019
Export Citation:
Assignee:
DRIL-QUIP INC (US)
International Classes:
E21B19/00; E21B41/00; F15B11/072; F15B15/14
Foreign References:
| US20170254159A1 | 2017-09-07 | |||
| US20180216421A1 | 2018-08-02 | |||
| US20160145951A1 | 2016-05-26 | |||
| US20160145952A1 | 2016-05-26 | |||
| US20140202327A1 | 2014-07-24 |
Attorney, Agent or Firm:
CATE, Avery et al. (US)
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