Dielectric fitting

• US 9,169,953 B2
• Filed: 02/05/2013
• Issued: 10/27/2015
• Est. Priority Date: 02/09/2012
• Status: Active Grant

• Current Assignee: Cavagna Group S.p.A. (Parteca SpA)
• Original Assignee: Cavagna Group S.p.A. (Parteca SpA)
• Inventors: Cavagna, Savio
• Primary Examiner(s): BOCHNA, DAVID
• Application Number:
  US13/759,493
• Publication Number:
  US 20130207377A1
• Time in Patent Office: 994 Days
• Field of Search: 285/47, 285/368, 285/293.1, 285/423
• US Class Current: 1/1
• CPC Class Codes: F16L 25/02 Electrically insulating joints or couplings
• CPC Class Codes: F16L 25/026 for flanged joints

Abstract

The present disclosure pertains to a dielectric fitting for use in a fluid piping system to provide electrical insulation between metal components while fluid is transferred through a sealed connection. The dielectric fitting includes a metallic body including a distal end and a proximal end and a flange extending radially from the body and having a first end surface and an opposite second end surface. An electrical insulation over-mold adheres to the distal end of metallic body, the second end surface of the flange and at least a portion of the first end surface. The insulation over-mold is secured by a plurality of recesses or by an annular member positioned along the distal end. The over-mold includes an annular portion that extends axially away from the distal end of the metallic body.

Claims

1. A dielectric fitting that defines a fluid passage to communicate between a pair of axially spaced associated metal components of a conduit system and provides electrical insulation between the associated metal components, the fitting including an inlet and an outlet, the dielectric fitting comprising:

a metallic body including a distal end and a proximal end wherein the metallic body includes a base member, a flange that protrudes radially outwardly from the base member and wherein the fluid passage extends from the distal end to the proximal end of the metallic body, the base member being configured to connect to a first associated metal component at the proximal end and the flange being configured to connect to a second associated metal component at the distal end;

an electrical insulation over-mold adhered to the distal end of the metallic body and at least a portion of the flange, the insulation over-mold including an annular portion which defines the inlet of the dielectric fitting and extends axially away from the distal end of the metallic body, wherein the electrical insulation over-mold electrically separates the metallic body from the second associated metal component; and

wherein the flange of the metallic body further comprises an annular groove which circumscribes the inlet and is configured to accommodate a gasket or an O-ring which faces the second associated metal component and wherein the over-mold extends over the annular groove.

2. The dielectric fitting in accordance with claim 1 further comprising a plurality of spaced recesses located at the distal end of the metallic body such that the insulation over-mold is at least partially received within the recesses.

3. The dielectric fitting in accordance with claim 2 wherein each recess includes a base wall, an end wall and a first and a second side wall.

4. The dielectric fitting in accordance with claim 2 further comprising an annular wall which extends axially inward at the distal end of the metallic body into the fluid passage.

5. The dielectric fitting in accordance with claim 4 wherein the annular wall abuts an annular flange within the passage of the dielectric fitting such that the insulation over-mold abuts against the annular wall and the annular flange.

6. The dielectric fitting in accordance with claim 1 further comprising an annular flange that extends radially inwardly from an annular wall defining the fluid passage of the metallic body such that the insulation over-mold includes an annular lip that extends axially inwardly from the distal end and abuts the annular flange.

7. The dielectric fitting in accordance with claim 1 wherein the metallic body further comprises an annular member that protrudes axially outwardly from the distal end and defines an opening wherein the insulation over-mold covers the annular member.

8. The dielectric fitting in accordance with claim 7 wherein the fluid passage is defined by an inner surface of the annular member, and wherein the insulation over-mold includes an annular sleeve that adheres to the inner surface and extends axially inwardly from the distal end to abut an annular flange that extends radially inwardly from the inner surface.

9. The dielectric fitting in accordance with claim 1 wherein the flange includes a first end surface, an opposite second end surface and a peripheral side wall that extends between the first end surface and second end surface, wherein the insulation over-mold covers the second end surface, the peripheral side wall and at least a portion of the first end surface of the flange.

10. The dielectric fitting in accordance with claim 1 wherein the flange includes at least one fastener aperture configured to receive an associated conventional fastener, the at least one fastener aperture including an inner surface that extends between a first end surface and a second end surface of the flange.

11. The dielectric fitting in accordance with claim 10 wherein the insulation over-mold covers the inner surface of the at least one fastener aperture of the flange.

12. A dielectric fitting defining a passage including an inlet and an outlet, the fitting comprising:

a metallic body including a base member and a flange which extends radially outwardly from the base member wherein a central bore extends from a distal end of the metallic body to a proximal end thereof such that the metallic body is configured for connection with a first associated metal component at the proximal end and is configured for connection with a second associated metal component at the distal end, wherein the flange includes a first end surface and an oppositely disposed second end surface such that the second end surface of the flange is generally aligned with the distal end of the metallic body;

an electrical insulation over-mold adhered to the distal end of the metallic body, the second end surface of the flange and at least a portion of the first end surface of the flange wherein the insulation over-mold includes an annular portion that defines the inlet of the dielectric fitting and extends axially away from the distal end of the metallic body;

wherein the metallic body further comprises an annular member which extends axially outwardly from the distal end of the metallic body and defines an opening in communication with the inlet and wherein the annular portion of the insulation over-mold is adhered to both an outer and an inner face of the annular member; and

,

wherein the flange includes at least one fastener aperture configured to receive an associated conventional fastener, the at least one fastener aperture including an inner surface that extends between the first end surface and the second end surface of the flange such that insulation over-mold adheres to the inner surface of the at least one fastener aperture of the flange.

13. The dielectric fitting according to claim 12 wherein the annular portion of the insulation over-mold includes a radial taper shaped profile.

14. The dielectric fitting according to claim 12 further comprising an annular groove defined axially inwardly from the distal end wherein the groove circumscribes the annular member and is configured to accommodate a gasket.

15. The dielectric fitting according to claim 12 further comprising an annular flange which extends radially inwardly from an annular wall of the central bore and wherein the insulation over-mold includes an annular lip that extends axially inwardly from the distal end and abuts the annular flange.

16. A method of providing dielectric protection between a pair of axially spaced metal components of a conduit system comprising:

providing a dielectric fitting having a metallic body including a base member and a flange that protrudes radially outwardly from the base member, the metallic body including an inlet located adjacent a distal end of the metallic body and an outlet located adjacent an opposite proximal end of the metallic body, the outlet being in communication with the inlet;

providing a groove in the flange encircling the outlet and locating a gasket or an O-ring in the groove;

securing an electrical insulation over-mold to at least a portion of the flange wherein an annular portion of the insulation over-mold defines the inlet and extends axially away from the distal end, wherein the electrical insulation over-mold extends over the gasket or O-ring located in the groove;

attaching a first metal component to the proximal end of the dielectric fitting; and

attaching a second metal component to the distal end of the dielectric fitting such that the annular portion of the insulation over-mold is received by the second metal component.

17. The method of providing dielectric protection according to claim 16 including securing the insulation over-mold to the dielectric fitting by receiving at least a portion of the insulation over-mold within a plurality of spaced recesses positioned along the distal end of the metallic body.

18. The method of providing dielectric protection according to claim 16 including securing the electrical insulation over-mold to the dielectric fitting by extending an annular member axially away from the distal end of the metallic body and covering the annular member with the annular portion of the electrical insulation over-mold such that the annular member and the annular portion of the electrical insulation over-mold are configured to be received within the second metal component.