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Патент USA US3077912

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Feb. 19, 1963
Filed April 2. 1959
0 70 0
~ 36 J24
5/11/79; w/Lsalv, LEW/5 #445245
United States Patent ()?ice
Patented Feb. 19, 1963
operates effectively 'at high ?uid pressures, while at the
same time having a relatively low threshold pressure,
i.e., a ?ow control which is operable ‘over a relatively
Philip George Honsinger, St. Clair Shores, Mich, as
Wide range of pressures including a low pressure range.
signor to American Radiator & Standard Sanitary Cor
poration, New York, N.Y., a corporation of‘ Delaware
It has been previously pointed out that the conven
tional ?ow control devices commonly produce a shrill
Whistling noise at low ?uid pressures, particularly ?u'id
pressures below the threshold pressure. Accordingly, it
This invention relates to a ?uid ?ow control mechanism
is an object of the present invention _‘to provide a flow
operable to maintain substantially constant volumetric 10 control which is operable at relatively low ?uid pressures
delivery therethrough in the presence of substantial var
to eliminate the whistling or other audible vnoises. w
iations in pressure drop. The invention has particular
A further object of the invention is to provide “a ?ow
application in water lines of domestic automatic washing
construction having the above-mentioned “anti
machines, although it is susceptible to use in other ?uid
whistling” and “low threshold pressure” features, while
Filed Apr. 2, 1959, 'Ser. No. 803,619
2 Claims. (Cl. 138-45)
lines as well.
During the past several years annular ?ow control de
15 being susceptible to manufacture as a low-cost device.
vices have been developed for delivering substantially
Other objects of this invention will appear in ~the fol
lowing description and appended claims, reference being
constant volumetric deliveries in the presence of sub
had to the accompanying drawings forming a part of
stantial variations in inlet pressure. These devices usual
speci?cation wherein like reference characters desig
ly take the form of an annular rubber element seated on 20 nate corresponding parts in the several views.
the upstream face of a shoulder positioned in a ?uid
In the drawings:
line, the construction of the device being such that high
FIGURE 1 is a sectional view taken through a ?ow
?uid pressures on its upstream face portion are eifective
‘mechanism forming one embodiment of the in-‘
to reduce the area of the central opening in the element
vention; and
for choking the ?ow in such manner as to maintain a 25
FIG. 2 is .a sectional view taken through a ‘second em
substantially constant volumetric delivery over fairly
wide ?uctuations in inlet pressure. The ?ow annulus
devices have been of generally two constructions, one
construction wherein the inner portion of the ?ow annu
bodiment of the invention.
Before explaining the present invention in detail, it is
to be understood that the invention'is not limited in its
application to the details of construction and arrange
lus projects radially beyond the opening de?ned by 30
ment of parts illustrated in the accompanying drawings,
the shoulder to permit it to de?ect under the force of
high ?uid pressures with a “hinge-like” action so as to
vary the ?ow annulus opening. In the other form the
?ow annulus has been constructed of rubber-like deform
able material of such character that the ?uid pressures 35
are effective to axially compress the annular portions
of the ?ow annulus so as to squeeze the annulus axially
to effect the desired reduction in flow annulus opening
since the invention is capable of other embodiments and
of being practiced or carried out in various Ways. Also,
it is to be understood that the phras‘eology or terminology
employed herein is for the purpose of description and
not of limitation.
Referring to FIG. 1 of the drawings, there is shown
a flow control ‘mechanism comprising a casing structure
10 which may be formed as an integral part of an inlet
12 for a water mixing valve (not shown in its entirety),
With both types of ?ow control constructions the ?ow 40 said
water mixing valve being commonly ‘employed for
annulus has had to have a clearance withrespect to the
the proportioning of hot and cold water to the tub of an
surrounding casing walls to facilitate manufacturing oper
automatic washing machine. It is desirable that the rate
ations and permit the ?exing or deformation required for
of ?uid ?ow be substantially constant in the ?uid streams
reducing the ?ow opening area at high pressures. This
to insure correct proportioning of the different tempera
clearance allows the inlet ?uid to ?ow around the pe
riphery of the ?ow annulus at low pressures, thus by 45 ture ?uids. Accordingly there is provided within casing
structure It} a resilient rubber-like ?ow annulus 14 ‘seated
passing the ?ow annulus opening and exerting a pulsat
on an annular shoulder or seat 16 de?ned by an internal
ing action on the annulus tending to vibrate the annulus
surface of ‘easing structure 10. A retainer ring 13 may
from its seating engagement with the shoulder. The re
‘be provided to loosely hold ?ow annulus 14 in position
sult is that the flow annulus tends to ?oat on the shoulder
‘and serve as a mounting surface for conventional strainer
at low inlet pressures so as to produce an audible shrill 50 screen
whistling noise. At higher ?uid pressures the ?uid forces
the ?ow washer tightly onto the seating surface, and elim
inates the whistling noise.
Flow annulus 14 is provided with a relatively thin pe~
ripheral ?ange or skirt 18 which sealably engages the
shoulder 16 to prevent ?ow of ?uid lay-passing the ‘central
At the low ?uid pressures the ?oating effect which is
given to the ?ow washer causes a ‘considerable quantity 55 opening 20 in annulus 14. Flange 18 should be of rela
tively ‘thin character so as to render it relatively easily
of ?uid to by-pass the central opening in ‘the ?ow annu
?exed by the ?uid pressures against its ‘surface 22. In
lus, and the total volumetric delivery through the device
this connection it will be understood that the sealing ac
is therefore not proportional to ?uid pressure in the de
‘is actually obtained by the ?uid pressures acting on
sired manner. This inaccuracy in ?ow control action at
the low ?uid pressures is objectionable in many situations 60 surface 22 so as to tightly force ?ange 18 into tight seal
ing engagement against shoulder surface 16. By con
wherein the ?uid line pressures are relatively low. The
structing ?ange 18 as a rela’tively'thin easily ?exed ele
conventional two gallon per minute ?ow control device of
relatively low ?uid pressures are enabled to provide
the “de?ectable” type is normally ineffective to control
the desired sealing action. The ‘thinness of ?ange 18
?uid at ?uid pressures below 15 psi. The conventional
two gallon per minute “deformable” type ?ow washers 65 (in the axial direction) may be varied somewhat depend
ing on the installation and operating pressures, but in a
are normally ineffective at ?uid pressures below approxi-'
typical illustration the ?ow annulus was constructed with
mately 20 psi.
?ange thickness of about .0525 inch, with a material hav
The pressure at which the ?ow control begins to be
ing a durornetcr of 48.
effective for volumetric control purposes is normally re
It will be noted that the annular edge 24 de?ned by
ferred to as the “threshold” pressure, and it is an object
shoulder 16 is spaced radially outwardly from the inner
of the present invention to provide a ?ow control which
surface 26 of ?ow annulus 14 so as to enable ?uid pres
sures to act on the upstream face portion 28 of the ?ow
annulus for de?ecting annular ?ow ori?ce portion 30 in
a downstream direction, the action being such as to re
duce the ?ow opening de?ned by flow opening 20 so as
to maintain a relatively constant volumetric ?ow through
the casing structure. At low ?uid pressures, the force on
face 23 is lessened, and the resilient ?ow annulus material
is e?ective to move the annulus portion 30 in an upstream
direction toward its FIG. 1 position so as to enlarge the
?ow opening 20 for compensating for the decreased pres
affected without departing from the spirit of the inven
The drawings illustrate shoulder surfaces 16 and 116
as formed integrally with the casing structures 10 and 110-.
However, it will be appreciated that these shoulder sur
faces can be formed as separate insert elements.
the drawings illustrate ?anges 18 and 118 as extending
from the ?ow annulus elements into close adjacency to’
the internal casing surfaces 411. However, it will be ap
preciated that the sealing engagement may be made pri
marily on the shoulders 16 and 116 so that it is not neces
sary in all installations that ?anges 18 and 118 extend eu~
sure. The action is such so as to maintain relatively con
stant volumetric flow through the device irrespective of
substantial variations in inlet pressure. The illustrated
tirely to surface 40. The drawings illustrate the ?ow con
struction as part of the inlet of a water mixing valve.
flow control is of the “de?ectable” type as opposed to the
However, it will be appreciated that the ?ow control de
vice may be constructed separately from a ‘mixing valve,
“de?ectable” type ?ow annulus structures conventionally
and may be formed integrally or separately from di?erent
have lower threshold pressures than the “deformable” type
valves and other ?ow regulating devices controlling vari
?ow annulus structures, due to the fact that less ?uid
ous different ?uid streams.
pressure is required to de?ect an unsupported portion of
Various other changes may be made in the construction,
the ?ow annulus than is required to axially compress the 20
Without materially departing from the spirit of the in
entire ?ow annulus. Because of the inherent ability of
vention as de?ned in the appended claims.
the “de?ectable” type ?ow annulus to operate at lower
I claim:
threshold pressures it is preferred under the present in
1; In a ?uid flow control device for maintaining sub~
vention to utilize the “de?ectable” type.
stantially uniform volumetric ?uid delivery rates there
In conventional ?ow control constructions, at low ?uid
pressures the ?uid has a tendency to ?ow around the ?ow
a ?uid containing casing having a fluid inlet, a ?uid
annulus periphery and along the seating shoulder, as well
outlet and an annular shoulder therebetween,
as through the ?ow annulus central opening. This tend
a free ?oating ?ow control vwasher operable upon said
ency is due to the fact that the low ?uid pressures are
insui?cient to tightly seat the ?ow annulus on the support 30
said flow control washer comprising a resilient annular
shoulder. The ?ow annulus thus “?oats” on the shoulder
body having an axially extending ?ow ori?ce and
and allows more than the desired quantity of ?uid to pass
axially spaced inlet and outlet faces transverse to the
through the casing. In other words the ?ow annulus loses
its control at the low pressures. Additionally, the “?oat
annular body being of substantial axial and radial
ing” action produces an objectionable shrill whistling 35 saidthickness
so that compression by inlet ?uid pressure
to reduce the ?ow orifice opening area,
In the present construction the ?ange or skirt 18 be;
and a thin, ?exible annular ?ange formed integrally
comes effective to seal against surface 16 at very low
with the periphery of said body at said outlet face,
?uid pressures, and there is no by-passing of the ?uid
said ?ange having an axially facing surface,
around the flow annulus opening. As a result, the objec 40
said axially facing surface being freely operatively
tionable shrill whistling noise is eliminated, and the de
positionable against said shoulder by the pressure of
axially “deformable” type previously discussed.
vice begins to correctly control the ?ow at a lower pres
sure. At the same time the device retains its control at
the higher ?uid pressures to the same extent as corre
sponding conventional constructions.
The device as shown in FIG. 2 is in many respects simi
lar to that shown in FIG. 1, and similar reference numerals
are employed wherever applicable. In the FIG. 2 ar
rangement the ?ow annulus 114 is provided with a pe
ripheral skirt or ?ange 118 having the same function as
the corresponding ?ange in the FIG. 1 construction; it
being noted however that ?ange 118 is tapered to a feather
edge for providing a very easily ?exed outer edge portion
susceptible to being tightly sealed against shoulder 116
at very low ?uid pressures. Shoulder 116 in the FIG. 2
construction extends inwardly to a point 124 spaced ra
dially inward from point Salon the lower face of annulus
114. The lower face of annulus 114 is ?ared upwardly
and inwardly at 36 ‘beginning from point 34 and ending
adjacent the central opening 21). The provision of this
upwardly-inwardly ?aring surface 36 enables annulus
114 to de?ect under ?uid pressures without having the de
?ecting portion at any time engage the surface of shoul
der 116. By this arrangement the requirement for close’
tolerance formation of the seating surface is eliminated,
and the area of ?ow passage 38 can be varied consider
ably without aifecting the operation of the device.
The FIG. 2 construction operates in substantially the
same manner as the FIG. 1 construction, the principal
purpose in showing the FIG. 2 construction is merely to
illustrate that variations in ?ow annulus design may be
inlet ?uid ?owing through said casing to effectively
‘seal against said shoulder even at low inlet pressures.
2. In a ?uid ?ow control device,
a casing de?ning an inlet chamber and an outlet cham
ber with an annular shoulder therebetween,
a free ?oating ?ow control washer operable upon said
said washer having a resilient, generally cylindrical
body and having an axially extending ?ow ori?ce and
axially spaced inlet and outlet faces transverse to the
axis, said body being of substantial axial and radial
thickness so that compression by inlet ?uid pressure
is effective to reduce the ?ow ori?ce opening area,
and a thin, ?exible annular ?ange formed integrally
with the periphery of said body,
said ?ange being freely operatively positionable against
said shoulder by the pressure of inlet ?uid ?owing
through said casing to effectively seal against said
shoulder even at low inlet chamber pressures.
References Cited in the ?le of this patent
Kempton ____________ __ Nov. 30,
Hamer ______________ __ Feb. 22,
Dahl _________________ __ Ian. 1,
Warhus _____________ __ Feb. 12,
Rimsha et al. _________ __ Dec. 3,
Clark ______________ _- Dec. 10,
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