Bi-metal valve body casting and method of making same

Patent metadata

Field	Value
Publication number	US-2019099804-A1
Application number	US-201715721628-A
Country	US
Kind code	A1
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Apr 4, 2019
Grant date	—

Abstract

A valve body having a ring of dissimilar material and a method of forming the valve body are described. The valve body includes an inlet, an outlet and a ring of dissimilar material. The method includes forming a valve core, splitting the valve core, placing a metal ring of dissimilar material between two pieces of the valve core, casting a valve body around the valve core, and fusing the metal ring to the valve body.

First claim

1 . A method of forming a valve body having an area of dissimilar material fused therein, the method comprising:
forming a valve core, the valve core having an inlet section and an outlet section that are connected by a port section; splitting the valve core into a first core part and a second core part; placing a metal ring between the first core part and the second core part; joining the first core part and the second core part together to form the valve core with the metal ring; placing the valve core in a casting pattern; filling the casting pattern with valve body material to form a valve body; fusing the metal ring with the valve body material during the filling of the casting pattern by partially melting the metal ring, thereby allowing the metal ring material to fuse with the valve body material; cooling the valve body material; and removing the valve core.

2 . The method of claim 1 , wherein splitting the valve core into a first core part and a second core part comprises splitting the valve core along a port mid-line.

3 . The method of claim 2 , wherein the step of placing the metal ring between the first core part and the second core part comprises placing the metal ring around the port section.

4 . The method of claim 2 , further comprising forming an alignment structure on the first core part and on the second core part.

5 . The method of claim 2 , wherein the alignment structure comprises at least one post and at least one hole.

6 . The method of claim 5 , wherein the alignment structure comprises a first post and a first hole disposed on the first core part, and a second post and a second hole disposed on the second core part.

7 . The method of claim 1 , further comprising forming the metal ring from a wrought material.

8 . The method of claim 1 , wherein filling the casting pattern with valve body material to form a valve body comprises filling the casting pattern with carbon steel.

9 . The method of claim 1 , further comprising machining a ring seat into the metal ring.

10 . The method of claim 1 , wherein the valve core is formed by sand casting.

11 . A valve body having a ring of dissimilar material, the valve body comprising:
a fluid inlet and a fluid outlet connected by a fluid passageway; a valve port disposed in the fluid passageway; and a metal ring of dissimilar material fused to the valve body in the fluid passageway.

12 . The valve body of claim 11 , wherein the metal ring is disposed in the valve port.

13 . The valve body of claim 12 , further comprising a plug seat formed in the metal ring.

14 . The valve body of claim 11 , wherein the metal ring is made of one of 410 SST and Alloy 6 , or combinations thereof.

15 . The valve body of claim 11 , wherein the valve body is made of carbon steel.

16 . The valve body of claim 11 , wherein the metal ring includes a bonding structure.

17 . The valve body of claim 16 , wherein the bonding structure is an annular shelf and wall.

18 . The valve body of claim 16 , wherein the bonding structure is a cone-shaped band.

Assignees

• Fisher Controls Int Llc

Inventors

• Hostetter Steven K
• Gabriel Thomas N

Classifications

• B22D19/08

  for building-up linings or coverings, e.g. of anti-frictional metal · CPC title

• F16K1/46

  Attachment of sealing rings · CPC title

• F16K25/005

  Particular materials for seats or closure elements · CPC title

• F16K27/00 Primary

  Construction of housing (methods for welding housings B23K); Use of materials therefor · CPC title

• F16K27/02

  of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) · CPC title