AU2010241439B2

AU2010241439B2 - A flow control and check valve improvement

Info

Publication number: AU2010241439B2
Application number: AU2010241439A
Authority: AU
Inventors: Grant Schroeder
Original assignee: Maric Flow Control Pty Ltd
Current assignee: Maric Flow Control Pty Ltd
Priority date: 2009-11-16
Filing date: 2010-11-15
Publication date: 2017-05-25
Anticipated expiration: 2030-11-15
Also published as: AU2010241439A1

Abstract

A flow rate control and check valve which has an additional pressure release aperture to ensure release of a resilient flow control member when required to change from a flow control position to a check valve position. l/l 9x 2

Description

1 2010241439 02 May 2017

A FLOW CONTROL AND CHECK VALVE IMPROVEMENT This invention relates to a flow rate control and back flow check valve. BACKGROUND OF THE INVENTION

Flow control valves are known which have a doughnut shaped resilient material within a body so that its central aperture size varies in accordance with variations in liquid pressure differentials across the aperture in the control member, and in this way effects a constraint on the flow rate.

It is also known to use this arrangement in a combination where the same doughnut member is held in the body so that it will prevent back flow, by being caused to move backwards against apertures which are otherwise open.

OBJECT OF THIS INVENTION

An object of this invention is to provide a modification to an existing arrangement which provides improved reliability to the check valve action in this combination device.

Otherwise, it is an object to provide the public with a useful alternative.

BRIEF DISCLOSURE OF THE INVENTION

In one form of this invention, it can be said to reside in a flow rate control and back flow check valve having a body with a passageway there through, an annular seat at a down stream location in the passageway, a barrier at an up stream location, a flow control member of generally doughnut shape and of resilient material positioned within the passageway between the barrier and annular seat, the respective sizes and shapes of the flow control member and the passageway portion in which it is located being arranged to allow the flow control member to move between a position against the annular seat where it will operate to effect flow control, to a backflow check position where it will engage with sealing effect against an aperture or apertures in the 5 barrier which would otherwise permit liquid to pass there through, the annular seat having a central aperture coinciding in coaxial alignment with a flow control aperture of the flow 2 2010241439 02 May 2017 control member, and a further at least one aperture which is positioned to be closed by the flow control member when in a flow controlling position.

The problem relates to a consistency of check valve operation when there is a reverse pressure involved.

It has been found that in some circumstances the flow control member will stick in the flow control position and will not revert to a check valve position even though there is a reverse pressure of liquid being effected. A discovery has been made that if there is provided a further aperture in the annular seat, that this is a sufficient interruption in whatever dynamic circumstances are occurring when the checking valve arrangement doesn't work, that this then ensures a significantly greater reliability.

For a better understanding of this invention it will now be described with the assistance of drawings wherein

Figure 1 is a cross sectional view of a flow rate control and back flow check valve with flow control member in a back flow check position,

Figure 2, again being a cross section of a body there is shown the flow control member in a flow controlling position, and Figure 3 being a cross section along the lines A-A in

Figure 2.

Referring in detail to the drawings, there is a body 1 which includes a central axially aligned passageway 2 which has on one side a barrier 3 which has a plurality of apertures such as at 4 which are a plurality of cylindrical apertures positioned equidistant from an axial center passing through the barrier 3 which are each aligned to be blocked by a portion of a flow control member 6 when in a back flow checking position. The barrier 3 is held in the body 1 by mutual screw threads.

Further down stream there is an annular seat 5 against which the flow control member 6 is positioned when in a flow controlling position. This is of doughnut shape and is formed of selected resilient material (in this case rubber) so that passage of liquid through it's central aperture 7 can result because of Bernoulli suction in a relative 2010241439 02 May 2017 3 closing of the aperture size in response to any increase in liquid velocity through the aperture and thereby providing restricting flow and effecting thereby flow control.

The flow control member 6 engages against the annular seat 5 which is also tapered which has the effect of assisting in centering of the flow control member 6 and maintaining its alignment with a coaxially aligned first aperture 9 through which flow of fluid would exit.

The improvement relates to the inclusion of a second aperture 10 through the annular seat 5, which provides a liquid passageway between a downstream end 11 and an upstream chamber 12 in the body 1. This second aperture 10 is in this case a bore of relatively small diameter but it does provide enough flow to allow for any pressure imbalances holding the member 6 when it needs to be in a flow checking position to be released. This second aperture 10 is closed in Figure 2 because the flow control member 6 is resiliently pressed against this when in a flow controlling position.

However, when there is a reverse flow so that a check valve effect is required, it is found that this second aperture 10 providing an aperture there through which is offline from the otherwise co-annular first aperture 9, then allows liquid to act against the reverse side of the flow control member 6 and ensures that it will push back into the position as shown in Figure 1 where it is engaging with closing effect the apertures 4.

The use of one aperture is described but it is envisaged that there could be more than one and the position and alignment of these can be varied without departing from the spirit of this invention.

Claims

THE CLAIMS DEFINING THE INVENTION ARE:

1. A flow rate control and back flow check valve having a body with a passageway there through, a tapered annular seat at a down stream location in the passageway, a barrier at an up stream location, a flow control member of generally doughnut shape and of resilient material positioned within the passageway between the barrier and the tapered annular seat, the respective sizes and shapes of the flow control member and the passageway portion in which it is located being arranged to allow the flow control member to move between a position against the tapered annular seat where it will operate to effect flow control, to a backflow check position where it will engage with sealing effect against an aperture or apertures in the barrier which would otherwise permit liquid to pass there through, the annular seat having a central first aperture in coaxial alignment with a flow control aperture of the flow control member, and a further at least one second aperture which is positioned to be closed by the flow control member when in a flow controlling position; wherein the second aperture is located through the tapered annular seat and is offset to a side of the central first aperture, the second aperture providing a liquid passageway to allow fluid to pass through from a downstream end to an upstream end of the flow rate control and back flow check valve.
2. A flow rate control and back flow check valve as in claim 1 in which the resilient material is rubber.
3. A flow rate control and back flow valve as in any one of the preceding claims wherein the barrier includes a plurality of apertures which are positioned equidistant from an axial center of the body.