One-way fluid flow non-return valve

Details One-way fluid flow non-return valve One-way fluid flow non-return valve

1994-03-07

1994-12-06

Nilson, Robert G.

Valves and valve actuation

Lost motion between actuator and valve

Check valve with external opening and closing means

251252, F16K 102

Patent

active

053703561

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a one-way fluid flow, non-return valve and is classified, by International Patent Classification F 16 K 1/02.
2. Description of Related Art
The instant invention is specifically designed to provide a valve for use in sanitary water systems with the valve functioning to prevent the return of fluid back into the water system in case of pressure lost, even when the valve has been left in the open position.
Although various forms of valves of this type heretofore have been provided, one problem existing with previously known valves is that in the event the valve handles water having dirt or other impurities therein it is possible that dirt within the water passing through the valve may accumulate in internal areas of the valve and prevent proper non-return flow of water therethrough.
Previously known non-return flow valves are used not only in domestic water systems but also in other fluid systems and usually operate on the principle of a threaded shaft, whereby movement of a valve operation piston is effected by rotation of the threaded shaft or a shaft equipped with a helical groove. Each of these forms of valves usually does not protect the fluid system from return flow of fluid in the case of lost inlet pressure.
Fluid flow controlling valves may be used in many different fluid handling systems in which the valves, during operation of the systems, remain open. In many of these types of systems it is imperative to provide a one-way fluid flow non-return valve in order to prevent reverse flow of fluid in the event of pressure lost.
Further, in most fluid handling systems non-return flow valves are installed at the inlet for the system and are not readily adaptable for use at various discharge points of the fluid handling system.


SUMMARY OF THE INVENTION

In a first disclosed form of the instant invention a blind bore is provided in the valve stem and a piston, provided with a shank, has its shank slidably received within the blind bore with a compression spring seated within the blind bore in front of the piston shank. As the valve is opened the pressure of the supply fluid acting upon the piston maintains the latter in a retracted position to thereby allow fluid flow through the valve. However, if the supply pressure is terminated, the compression spring biases the piston to a closed position.
In a second disclosed form of the instant invention additional structures are incorporated in order to reduce any tendency of malfunction of the valve as a result of the buildup of impurities or small dirt particles therein.
The main object of this invention is to provide a one-way fluid flow, non-return flow valve which may be used in substantially any environment, and which is specifically adapted for use at each domestic plumbing water flow controlling valve station.
Another object of this invention is to provide a non-return flow valve which will be wholly operative to prevent the return flow of fluid therethrough, even if the pressure of supply fluid to the valve is reduced to zero.
Yet another important object of this invention is to provide a non-return flow valve in accordance with the preceding objects which may be readily substituted for existing flow controlling valve assemblies of pre-existing domestic water controlling valve fixtures.
A final object of this invention to be specifically enumerated herein is to provide a non-return flow valve construction in accordance with the preceding objects and which will conform to conventional forms of manufacture, be of simple construction and easy to use so as to provide a device that will be economically feasible, long-lasting and relatively trouble free in operation.
These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughou

REFERENCES:
patent: 630949 (1899-08-01), Thummel
patent: 858771 (1907-07-01), Whitehouse
patent: 1541757 (1925-06-01), Allen

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