Metal sealing system for triple eccentricity butterfly valve

Patent metadata

Field	Value
Publication number	US-11644103-B2
Application number	US-202117476044-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Sep 24, 2020
Publication date	May 9, 2023
Grant date	May 9, 2023

Abstract

A metal sealing system for a triple eccentricity butterfly valve includes a dynamic metal seal, having a metal core surrounded by an external coating; a metal case with an external surface that has an inclined conical shape, including a first housing inside which the dynamic metal seal is mounted; a metal cover fixed to the metal case to allow it to close by flush fitting of the upper or lower faces of the metal cover and the metal case, the metal case having a second housing into which the metal cover fits, the dynamic metal seal being located between the metal cover and the surface of the metal case defining the first housing.

First claim

The invention claimed is:

1. A metal sealing system for a triple eccentricity butterfly valve comprising:
a dynamic metal seal, comprising a metal core surrounded by an external coating;
a metal case with an inclined conical external surface, the metal case including a first housing inside which the dynamic metal seal is mounted, and including a second housing formed as a cut-out in an upper or lower surface of the metal case; and
a metal cover, attached to the metal case to allow the metal case to close by flush fitting of the upper face or lower face of the metal cover with a respective upper face or lower face of the metal case,
wherein the metal cover is positioned within the cut-out of the metal case and extends along a portion of the first housing and is positioned adjacent the metal seal positioned inside the first housing, and
wherein the dynamic metal seal is located between the metal cover and the surface of the metal case defining the first housing.

2. The metal sealing system according to claim 1 , wherein the metal core is composed of a coil spring with adjacent turns that is closed on itself and that has the shape of a torus when in the rest state.

3. The metal sealing system according to claim 2 , wherein the external coating inside which the metal core is inserted, has the shape of a toroidal surface for which the generating circle does not close on itself, when in the rest state.

4. The metal sealing system according to claim 1 , wherein the first housing of the metal case comprises a lateral bearing surface with which the dynamic metal seal is positioned in contact, the lateral bearing surface having a non-circular shape, configured to obtain a variable interference around the periphery of the sealing system.

5. The metal sealing system according to claim 4 , wherein the lateral bearing surface is elliptical in shape.

6. The metal sealing system according to claim 5 , wherein the dynamic metal seal is circular in shape and can be radially compressed to take on an elliptical shape.

7. The metal sealing system according to claim 1 , wherein the dynamic metal seal is a “U” shaped seal, with an opening facing the upper or lower face of the case.

8. The metal sealing system according to claim 1 , wherein the metal sealing system is configured to be fitted in a disk or in a valve body, of a triple eccentricity butterfly valve comprising a valve body defining a conduit, and comprising an inclined conical part forming a valve seat, a valve stem guided in rotation on each side of the conduit, connected to a control rod of the butterfly valve, and a disk rotating simultaneously with the valve stem,
the metal sealing system bearing on a secondary seal, crushing it to make the seal between the metal sealing system and the disk or the valve body, and of which an external or internal inclined conical section respectively provides the seal with the valve seat or the disk respectively,
and said case being in contact with the secondary seal.

9. The metal sealing system according to claim 8 , wherein the metal sealing system is configured to be installed in a recess in the disk or in a recess in the valve body.

10. The metal sealing system according to claim 8 , wherein the metal sealing system is configured to be fitted in the disk, and wherein the metal sealing system and the secondary seal are configured to be compressed axially by a flange, attached to the disk by a network of nuts.

Assignees

• Commissariat Energie Atomique
• Technetics Group France Sas

Inventors

• Guimet Laurent
• Lefrancois Michel
• Boyer Etienne
• Tessier Marin
• Darque Jean-Jacques
• Thevenon Bertrand

Classifications

• F16K1/226

  Shaping or arrangements of the sealing · CPC title

• F16K1/228 Primary

  Movable sealing bodies · CPC title

• F16K1/2263

  the sealing being arranged on the valve seat · CPC title

• F16K1/2261 Primary

  the sealing being arranged on the valve member · CPC title

• F16K27/12

  Covers for housings · CPC title