Tri valve backflow preventer

• US 20050205139A1
• Filed: 03/22/2004
• Published: 09/22/2005
• Est. Priority Date: 03/22/2004
• Status: Active Grant

• Current Assignee: Guy Robert Walter
• Original Assignee: Guy Robert Walter
• Inventors: Walter, Guy Robert
• Granted Patent: US 7,121,293 B2
• Time in Patent Office: Days
• US Class Current: 137/599.110
• CPC Class Codes: E03B 7/077 Arrangement of backflow preventing devices
• CPC Class Codes: F16K 27/006 of hydrants
• CPC Class Codes: Y10T 137/0402 Cleaning, repairing, or assembling
• CPC Class Codes: Y10T 137/87338 Flow passage with bypass
• CPC Class Codes: Y10T 137/87555 Having direct response valve [e.g., check valve, etc.]

Abstract

The Tri Valve Backflow Preventer parts and materials consist of: steel nuts and bolts, ductile iron operating nut, O-rings made of nitrile rubber, rubber gaskets made of nitrile rubber, valve adjusting stem made of manganese bronze, valve wedge gates made of ductile iron encapsulated with EPDM rubber and valve body constructed of ductile iron. Materials and parts to be constructed in accordance with ASTM standards and meet the requirements of AWWAC-509 and AWWAC-504 which is in conformance for gate valves and butterfly valves.

Claims

1. I claim that the Tri Valve is improved by adding 2 side valves to it having one on each side of the main valve or water main to allow water to flow through the 2 side valves while the middle valve stays shut until all tests are done for water to be able to flow throught the main valve, the 2 side valves can be shut and the middle main valve opened to allow good potable water to flow to new sections of water main pipe, allowing no contamination to enter at any time by having a check valve Backflow Assembly on the 2 side valves while filling the new water main from existing water main, the existing water main would be free from any backflow contamination.