Check valve for a self-priming pump

• US 20070036665A1
• Filed: 08/09/2006
• Published: 02/15/2007
• Est. Priority Date: 08/11/2005
• Status: Active Grant

• Current Assignee: Envirotech Pumpsystems Incorporated (WEIR Group PLC)
• Original Assignee: Envirotech Pumpsystems Incorporated (WEIR Group PLC)
• Inventors: Northrup, James, Paulin, Greg, Shaw, James, Harmon, James
• Granted Patent: US 7,784,489 B2
• Time in Patent Office: Days
• US Class Current: 417/435
• CPC Class Codes: F04D 15/0005 by using valves
• CPC Class Codes: F04D 29/628 especially adapted for liquid pumps
• CPC Class Codes: F04D 9/008 by means in the suction mouth, e.g. foot valves
• CPC Class Codes: Y10T 137/79 Head retained by removable closure

Abstract

A check valve of the flapper type structured for use in a self-primer pump is structured for attachment to the pump casing in a manner that facilitates servicing of the check valve, and includes securement means that are positioned external to the casing and a flapper that is located through an opening of the casing in a manner that enables the servicing of the valve without dropping the flapper or the hardware into the interior of the pump.

Claims

1. A self-primer pump have a check valve, comprising:

a pump casing;

a check valve inlet;

a flapper valve located within a portion of said pump casing and positioned to register against said check valve inlet, said flapper valve having a hinge;

attachment apparatus for attaching said flapper valve to said pump casing, said attachment apparatus being positioned external to said pump casing to engage said flapper valve.

2. The self-primer pump of claim 1 wherein said flapper valve further comprises two laterally-extending hinge pin ends for attachment of said flapper valve to said attachment apparatus.

3. The self-primer pump of claim 2 wherein said flapper valve further comprises a hinge block positioned on each of said two hinge pin ends to secure said flapper valve to said attachment apparatus.

4. The self-primer pump of claim 3 wherein each said hinge block further comprises a spacer positioned between said hinge block and said attachment apparatus.

5. The self-primer pump of claim 1 wherein said attachment apparatus comprises an attachment member structured to engage with said flapper valve to secure said flapper valve in position within said pump casing.

6. The self-primer pump of claim 5 wherein said attachment member is a cover having bracket apparatus, and wherein said flapper valve further comprises two laterally-extending hinge pin ends for engagement by said bracket apparatus of said cover.

7. The self-primer pump of claim 6 further comprising a hinge block positioned on each of said two hinge pin ends to secure said flapper valve to said bracket apparatus.

8. The self-primer pump of claim 7 wherein each said hinge block further comprises a spacer positioned between said hinge block and said bracket apparatus.

9. The self-primer pump of claim 2 wherein said pump casing is structured with a supporting ledge configured to receive and retain said two laterally-extending hinge pin ends therealong.

10. A check valve device for a self-primer pump, comprising:

a check valve housing for attachment of a check valve to a pump;

a flapper valve having a hinge;

two opposingly positioned hinge pin ends extending laterally from each side of said hinge; and

attachment apparatus positioned external to said check valve housing and positioned to engage said flapper valve.

11. The check valve device of claim 10 wherein said check valve housing is configured with a supporting ledge to retain said two opposingly positioned hinge pin ends there along.

12. The check valve device of claim 11 wherein said flapper valve further comprises a hinge block secured to each of said two opposing hinge pin ends, said hinge blocks being supported by said supporting ledge.

13. The check valve device of claim 10 wherein said attachment apparatus is an access opening cover positioned externally to said check valve housing, said access opening cover having bracket apparatus for engaging said two hinge pin ends of said flapper valve.

14. The check valve device of claim 13 further comprising a hinge block secured to each said two hinge pin ends, said bracket apparatus of said attachment apparatus being positioned to engage said hinge blocks.

15. The check valve device of claim 14 further comprising a spacer positioned between each said hinge block and said bracket apparatus.

16. The check valve device of claim 14 wherein said bracket apparatus further comprises two hinge block brackets aligned to engage said hinge blocks connected to said two hinge pin ends.

17. The check valve device of claim 10 further comprising a single hinge pin extending through said hinge of said flapper, said single hinge pin having two opposing ends extending laterally from said hinge which provide said two opposingly positioned hinge pin ends.

18. The check valve device of claim 10 wherein said flapper valve is elastomeric having an embedded metal hinge.