High pressure coupling

• US 4,776,618 A
• Filed: 08/14/1987
• Issued: 10/11/1988
• Est. Priority Date: 08/14/1987
• Status: Expired due to Fees

• Current Assignee: Marathon Oil Company 539 South Main St Findlay Oh
• Original Assignee: Marathon Oil Company (Marathon Oil Corporation)
• Inventors: Barree, Robert D.
• Primary Examiner(s): Reese, Randolph A.
• Assistant Examiner(s): Knight, Anthony
• Application Number:
  US07/085,911
• Time in Patent Office: 424 Days
• Field of Search: 285/341, 285/348, 285/346, 285/342, 285/353, 285/356, 285/384, 285/389
• US Class Current: 285/341
• CPC Class Codes: F16L 19/061 a pressure ring being arranged between the clamping ring and the threaded member or the connecting member
• CPC Class Codes: F16L 19/07 adapted for use in socket or sleeve connections

Abstract

A high-pressure coupling for small-diameter pipe is obtained with standard male and female pipe connectors, three ferrules, an O-ring and a flat metallic washer disposed around the pipe and designed such that when the connectors are hand tightened, the coupling compresses the ferrules, O-ring and flat washer to obtain a coupling that will withstand pressures up to 10,000 psi.

Claims

1. A high-pressure coupling comprising a body having a male threaded portion and a circular bore within the body thereof to receive a pipe, a first ferrule having a circular bore to receive the pipe and having a flat base portion to fit against the face of the threaded end of the body and a front portion having an external wedge surface, a second ferrule having a circular bore to receive the pipe and having a back portion comprised of an internal wedge surface, which surface is at an angle less than the angle of the external wedge surface of the first ferrule, and having a front portion comprised of an external wedge surface, a third ferrule having a circular bore to receive the pipe and having an internal wedge surface on one end thereof at an angle to mate with the external wedge surface of the second ferrule and having a flat surface on the other end, the third ferrule being made of a material more pliable than the second ferrule, a resilient sealing O-ring having a circular inside diameter equal to or slightly less than the outside diameter of the pipe, a flat metal washer having a circular bore to receive the pipe and having flat surface to fit flush against the O-ring and to uniformly and axially load the O-ring, and a threaded coupling nut designed to engage and mate with the threaded portion of the body and designed to exert sufficient force to compress the ferrules and dynamically load the O-ring to obtain a coupling that will withstand high pressures when the coupling is tightened.

2. The coupling of claim 1 wherein the coupling nut is connected to a pipe.

3. The coupling of claim 1 wherein the third ferrule is made of polyimide.