Back to results
US 6,386,223 B1Granted
Back flow preventing valve apparatus, with multiple check valves
OwnerHerbert W. Hoeptner, IIIinventor
Life of this patent
Estimating the term…
Abstract
A safety valve apparatus body defining a flow chamber having a side outlet, a control adjustable to move lengthwise in the chamber, a first valving part carried by the control and movable to advance and retract relative to a second valve part on the body, thereby to provide a first check valve to block reverse flow of fluid through the chamber, and a second check valve proximate the outlet to pass forward fluid flow from the chamber and to block reverse flow of fluid to the chamber, via the side outlet.
Claims10
In safety valve apparatus:
- a) a body defining a flow chamber having a side outlet, and a side duct in series with said outlet,
- b) a control adjustable to move lengthwise in the chamber,
- c) a first valving part carried by the control and movable to advance and retract relative to a second valve part on the body, thereby to provide a first check valve to block reverse flow of fluid through the chamber,
- d) and a second check valve carried by said side duct and having a configuration to pass forward fluid flow from the chamber, to block reverse flow of fluid to the chamber, via said side outlet, and to block escape of such reverse flow past the second check valve and then to the exterior of said body.
1 more element
In safety valve apparatus, the combination comprising:
- a) first and second valving assemblies, each including a check valve,
- b) the first valving assembly having a primary side which is an inlet side to which potable water is supplied, and a secondary side,
- c) the second valving assembly having a primary side, and a secondary side which is a discharge side to which back pressure may be supplied,
- d) and a barrier chamber communicating between said first assembly discharge side and said second assembly primary side, for blocking cross-contamination between potable water at said first assembly primary side, and liquid at said second assembly secondary side,
- e) an actuator extending endwise in said chamber, for adjusting said first valving assembly, there being a side duct communicating with said chamber, the second valving assembly carried by said side duct,
- f) the second valving assembly including a first valving diaphragm, and wall structure at all times blocking by-pass flow of said liquid past the diaphragm and escape to the exterior of the second valving assembly.
3 more elements
Dependencies are inferred from the claim text.