METHOD FOR MANUFACTURING A BLOCK FORGED SWING CHECK VALVE BODY WITH A FULLY ENCAPSULATED SEAT RING

• US 20200132203A1
• Filed: 10/30/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Crane Chempharma & Energy
• Original Assignee: Crane Chempharma & Energy
• Inventors: KULKARNI, Sudhir K., Chaudhari, Sachin S., Bhalkar, Ranjit N.
• Granted Patent: US 11,480,254 B2
• Time in Patent Office: Days
• CPC Class Codes: B21J 1/04 Shaping in the rough solely by forging or pressing
• CPC Class Codes: B21K 1/24 valve bodies; valve seats
• CPC Class Codes: B23P 15/001 valves or valve housings welding B23K; valve housings per se F16K
• CPC Class Codes: B23P 15/002 poppet valves
• CPC Class Codes: F16K 15/03 with a hinged closure member or with a pivoted closure member
• CPC Class Codes: F16K 27/0227 with the valve members swinging around an axis located at the edge of or outside the valve member

Abstract

A block forged swing check valve body includes a fully encapsulated seat ring. The swing check valve body includes a through hole and a chamber having a shelf portion defined by a D-shaped passageway. The shelf portion overlies an annular shoulder that encapsulates the valve seat. Methods for the manufacturing and use thereof are also provided.

Claims

1. A method of manufacturing a swing check valve body comprising:

block forging a one-piece body having opposite ends, opposite sides, a top and a bottom;

machining a through hole having a first minimum diameter and extending along a first axis between the opposite ends, wherein the through hole defines a flow passageway;

machining a chamber having a second minimum diameter and extending downwardly from the top along a second axis, wherein the first and second axes are orthogonal, and wherein the chamber comprises a bottom defined by a floor separating the chamber from the through hole;

machining a D-shaped passageway through the floor along the second axis between the chamber and the through hole, wherein the D-shaped passageway comprises a linear wall and a curved wall opposite the linear wall, and wherein floor comprises a shelf portion overlying the through hole;

machining an annular shoulder having a third minimum diameter greater than the first minimum diameter and extending along the first axis under the shelf portion, wherein the annular shoulder is coaxial with the through opening; and

securing a valve seat in the annular shoulder such that the valve seat is not moveable along the first axis, wherein at least a portion of the valve seat underlies the shelf portion.

2. The method of claim 1 wherein the valve seat has a tapered width.

3. The method of claim 1 wherein block forging the one-piece body comprises block forging a rectangular prism.

4. The method of claim 1 wherein securing the valve seat in the annular shoulder further comprises welding the backside of the valve seat to the body.

5. The method of claim 4 wherein the annular shoulder is a first annular shoulder, and further comprising machining a second annular shoulder outboard of the first annular shoulder, wherein the second annular shoulder has a fourth minimum diameter and extends along the first axis, wherein the first and second annular shoulders are coaxial and wherein the fourth diameter is less than the third diameter, and wherein welding the backside of the valve seat comprises welding the backside of the valve seat to the body along the second annular shoulder.

6. The method of claim 1 wherein the shelf portion has a semi-circular shape.

7. The method of claim 1 wherein the front side of the valve seat comprises a hard sealing surface.

8. The method of claim 1 wherein machining the D-shaped passageway through the floor between the chamber and the through hole further comprises machining the D-shaped passageway along the second axis across the through hole and into a bottom of the one-piece body on an opposite side of the through hole from the chamber.

9. The method of claim 1 further comprising changing the dimension of one or more of the first, second and/or third minimum diameters and/or the D-shaped passageway.

10. A method of manufacturing a swing check valve assembly comprising the steps of claim 1, and further comprising mounting a valve in the one-piece body, wherein mounting the valve comprises pivotally mounting a support arm about a hinge axis positioned above the shelf and through hole, wherein the support arm and valve head are pivotable about the hinge axis from a closed position, wherein the valve head is disposed in the through hole in engagement with the valve seat, to an open position, wherein valve head is spaced apart from the valve seat.

11. The method of claim 10 further comprising securing a bonnet to the top of the one-piece body and thereby covering a top of the chamber.

12. A swing check valve body comprising:

a one piece block forged body comprising opposite ends, opposite sides, a top and a bottom, the block forged body further comprising;

a through hole having a first minimum diameter and extending along a first axis between the opposite ends, wherein the through hole defines a flow passageway;

a chamber having a second minimum diameter and extending from the top along a second axis, wherein the first and second axes are orthogonal, and wherein the chamber comprises a bottom defined by a floor separating the chamber from the through hole;

a D-shaped passageway extending through the floor between the chamber and the through hole, wherein the floor comprises a shelf portion overlying the through hole; and

an annular shoulder having a third minimum diameter and extending along the first axis under the shelf portion, and wherein the annular shoulders is coaxial with the through opening; and

a valve seat non-moveably secured in the annular shoulder, wherein at least a portion of the valve seat underlies the shelf portion.

13. The swing check valve body of claim 12 wherein the valve seat has a tapered width.

14. The swing check valve body of claim 12 wherein the backside of the valve seat is welded to the one-piece body.

15. The swing check valve body of claim 14 wherein the annular shoulder is a first annular shoulder, and further comprising a second annular shoulder disposed outboard of the first annular shoulder, wherein the second annular shoulder has a fourth minimum diameter and extends along the first axis, wherein the first and second shoulders are coaxial and wherein the fourth minimum diameter is less than the third minimum diameter, and wherein the backside of the valve seat is welded to the one-piece body along the second annular shoulder.

16. The swing check valve body of claim 12 wherein the front side of the valve seat comprises a hard sealing surface.

17. The swing check valve body of claim 12 wherein the D-shaped passageway extends across the through hole and into a bottom of the one-piece body on an opposite side of the through hole from the chamber.

18. A swing check valve assembly comprising the valve body of claim 12, and further comprising a valve mounted to the one-piece body, wherein the valve comprises a support arm pivotally mounted about a hinge axis positioned above the shelf portion and through hole, and a valve head coupled to the support arm, wherein the support arm and valve head are pivotable about the hinge axis from a closed position, wherein the valve head is disposed in the through hole in engagement with the valve seat, to an open position, wherein valve head is spaced apart from the valve seat.

19. The swing check valve assembly of claim 18 further comprising a bonnet secured to a top of the one-piece body, wherein the cover covers the chamber.