Constant flow valve

Details Constant flow valve Constant flow valve

1999-11-24

2001-04-03

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

C137S505000, C137S505130

Reexamination Certificate

active

06209578

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to regulating valves used to control the flow of fluid between a variable pressure source and an applicator from which the fluid is discharged as a spray.
2. Description of the Prior Art
Portable sprayers are widely employed in the application of herbicides and other chemical containing fluids. The sprayers may be of the “compression” type, where fluid is delivered from a pressurized tank, or they may be of the so-called “knapsack” type, where fluid is delivered from unpressurized tanks by manually operable pumps. In both cases, delivery pressure will vary. Excessive pressure will overly atomize the fluid discharge, causing the fluid to drift from the intended target. On the other hand, inadequate pressure will have the opposite effect, resulting in a wasteful excessive fluid application.
SUMMARY OF THE INVENTION
The regulating valve of the present invention addresses these problems by automatically closing when fluid delivery pressure are below a predetermined minimum level required to effect efficient spraying, by automatically opening when fluid delivery pressures exceed that minimum level, and when open, by automatically maintaining a substantially constant fluid flow to the sprayer nozzle.
A more detailed description of the invention will now be provided with reference to the accompanying drawings, wherein:


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