PIPE COUPLINGS

• US 3,794,361 A
• Filed: 10/04/1971
• Issued: 02/26/1974
• Est. Priority Date: 10/13/1970
• Status: Expired due to Term

• Current Assignee: Santrade Ltd. (Sandvik AB)
• Original Assignee: Alvar Torsten Westberg
• Inventors: Westberg, Alvar Torsten
• Primary Examiner(s): Kundrat, Andrew V.
• Application Number:
  US05/186,153
• Time in Patent Office: 876 Days
• Field of Search: 285/336,367,410 277/236,170,171,172
• US Class Current: 285/336
• CPC Class Codes: F16J 15/062 characterised by the geometry of the seat
• CPC Class Codes: F16J 15/104 characterised by structure
• CPC Class Codes: F16L 23/08 connection by tangentially arranged pin and nut
• CPC Class Codes: F16L 23/20 made exclusively of metal
• CPC Class Codes: F16L 23/22 made exclusively of a material other than metal

Abstract

The pipe coupling of the invention is characterized in that the channel, formed by opposed grooves provided on opposed faces of flanges on the ends of two pieces of pipe to be coupled, is composed of at least one essentially triangular groove in the contact face of each of the flanges; in addition, the channel has at least one radially directed groove whose cross-sectional area is essentially rectangular or trapezoidal. The groove is so shaped that at least one edge directed towards the sealing ring is formed between the last-mentioned groove and the other part of the channel.

Claims

1. In a pipe joint comprising opposed flanges (11, 14) on the pipe ends (10, 13), the adjacent faces of which flanges have annular opposed grooves (12, 15) forming a closed channel when joining the pipes together, said channel accommodating a sealing ring, the improved construction wherein the cross-sectional area of the sealing ring is at the most as large as the crosssectional area of the channel as defined by the opposed grooves, and said channel is composed of one portion of essentially triangular cross-section and one radially directed portion extending therefrom and whose cross-section is essentially rectangular, said radially directed portion having radially extending walls extending from the terminal end of said portion of essentially triangular cross-section and with said portion of essentially rectangular cross-section having a smaller extension in the axial direction of the pipe than the remaining part of the channel and forming with the other portion at least one edge (26) directed toward the sealing ring.

2. The pipe joint defined in claim 1, wherein said sealing ring is composed of a body of acid-resistant steel with a covering layer of a material penetratable by said edges when said flanges are drawn together.