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Патент USA US3047021

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July 31, 1962
G. w. WRIGHT ETAL
3,047,011
VACUUM RESPONSIVE SERVO FLOW CONTROL VALVE
Original Filed June 13, 1956
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1'25
107
91
79
27
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105
87
103
84
Frr____________4-,
INVENTOR.
“I
WRIGHT
By BURDETTE W. F055
ATTORNEY
3,947,011 '
f“ .. -. ..
. i
Patented July 31, 19%2
2
arator and would be discharged exteriorly of the dispenser
3,047,011
VACUUM RESPONSWE SERVO FLOW
CGNTROL VALVE
George W. Wright, Yoder, and Burdette W. Foss, Fort
Wayne, Ind, assignors to Tolrheim Corporation, Fort
Wayne, Ind., a corporation of Indiana
Original application June 13, 1956, Ser. No. 591,188.
Divided and this application Jan. ‘21, 1959, Ser. No.
788,244
5 Claims. (or. 137-4921)
so as to create a ?re hazard as Well as to result in the
wastage of a fairly expensive ?uid.
The valve 25 prevents such discharge as will be seen
from FIGURE 1 in which the body 79 and a diaphragm
81 de?ne a ?rst chamber 83 which communicates with
the branch pipe 26 while this diaphragm and a cap 84
de?ne a second chamber 85 which communicates with
the ?rst chamber through a restricted pressure balancing
ori?ce 87.
This invention relates to a control valve for booster
The body and a second diaphragm 89 de?ne a vacuum
pumping system for dispensing fuels, particularly such
chamber 91 which communicates with the suction pipe
27 while an atmospheric chamber 93, which is vented
through a restricted ori?ce 95, is de?ned by diaphragm
fuels as are prone to vaporize under high ambient temper
atures and/or vacuum to produce “vapor lock” in the
system. This application is a division of our prior appli 15
cation Serial Number S9l,l88 ?led June 13, 1956, entitled
Booster Pumping System.
‘
Vapon'zation of fuels, such as gasolines, in fuel dis
89 and a cap 96.
'
A port or passage 97 connects the chambers 83‘ and 91
in communication and is adapted to be opened, and closed
or throttled by a valve 99 which is carried by the, dia
phragm 81. The valve is closed by movement of dia
the usual automobile “?lling stations” has, in recent years, 20 phragm 81 toward the port 97 and thus closes with the
flow from the inlet chamber 83 to the outlet chamber
created problems in the dispensing of such fuels. Brief
91.
ly stated, the vapor pressures of such fuels are being
pensing systems such as are used to fuel automobiles in
The valve has a central port or passage 191 which
connects the chambers 85 and 91 in communication and
disposed at some distance from the tank, to lift the fuel 25 this port is opened, closed or throttled by a valve 103
which is disposed in chamber 85 and is supported on a
from the storage tank, draw it through the lateral suction
stem 105 which runs through passage 101 into chamber
conduits to the pump in the dispenser and thereafter de
91 where it is ?xed to the diaphragm 89. The stem 105,
liver the fuel under pressure to the vehicle tank. The
as shown in FIGURE 1, has an upwardly converging
fuels vaporize in the pipe when the suction is applied
tapered ?ow metering section or element 105’ disposed
by the pump and either the pump fails to prime or its de
immediately above the valve 193. The metering ele
livery is greatly reduced. These dif?culties are usually
ment coacts with the port 101 to gradually restrict or in
experienced in hot weather when the pumps, lines and
crease the flow of ?uid therethrough when the valve 103
even the gasoline in the tanks becomes hot. Gasoline
is open and it is moved relative to the valve 99. The
temperatures of 100 degrees Fahrenheit and higher are ex
perienced and it has occurred several times that only 35 taper is longer and included angle of the taper of this ele
ment is less than that of valve 103 and the maximum
one or two ?lling stations in a relatively large city were
diameter of the element is substantially the same as the
able to dispense any gasoline at all on hot days.
minimum diameter of the valve 103 so that once the valve
It is an object of the invention to provide a control
1% is opened, the effective area of the port 191 and
valve in advance of each dispenser pump for preventing
therefore, ?ow through port are governed by the axial
the ?ow of fuel to the dispenser when the dispenser is not
position of the element 1G5’ with respect to that of the
delivering fuel even though the dispenser pump may be
port. Valve 103 and port 161 tend to close both when
running.
diaphragm 89 moves away from port 191 or when valve
Yet another object of the invention is to provide a con
99 moves in an opening direction.
trol valve which is responsive to ‘the vacuum created by
A spring 1% in chamber 85 acts on the diaphragm 81 in _
the associated dispenser pump to control the admission
a direction to close valve 99 While a spring 107 disposed
of fuel to such dispenser pump.
in chamber ‘)1 acts on diaphragm 89 in a direction to
Still another object is to provide a control valve for use
close 193.
'
at the inlet of each dispenser which throttles the rate of
Valve Operation
?ow of fuel to the pump of such dispenser substantially
in proportion to the rate of flow of the fuel ‘being delivered
It will thus be seen that when no liquid under pressure
reduced and this results in the inability of the usual mo
tor pump type of ?lling station dispenser, vwhich is usually
ws
by such dispenser.
.is applied to chamber 83, the spring 106 will hold valve
Another object of the invention is to provide, for a sys
tem of the type described, a control valve which will
prevent fuel from being drawn from the nozzle of an
otherwise inoperative dispenser while the remote pump is
ber 91, the spring 167 will hold valve 103 closed. Spring
107 acting through stem 16-5 and valve 103, also helps to
operating.
‘
99 closed and that when no vacuum is applied to cham
hold valve 99 closed.
~
I
So long as valve 1% remains closed, the valve 99 will
These and other objects will become apparent from
remain closed even though liquid under pressure is ap
a study of this speci?cation and the drawings which are
plied to chamber 83 under pressure because the pres
attached hereto, made a part hereof and in which
60 sures in chambers 83 and 85 will be balanced through the
FIGURE 1 is an elevation in section of the control valve
ori?ce 87 and there will be no force applied to the dia
mechanism which is used to control the ?ow of liquid to
phragm in a direction to overcome either spring 106 or
the individual dispensers.
107.
FIGURE 2 is an elevation showing a system in which
No suction will be created in chamber 91, even with the
the source of supply is an elevated tank or pressure tank.
associated pump 29 in operation, so long as the nozzle
remains closed because under such conditions the by-pass
Control Valve (FIGURE 1)
valve which is always provided for pump 29 is wide
It will be understood that if liquid were supplied under
open and liquid is merely circulated from the pres
pressure to the dispensers 301 when the pump 29 is inop
sure side of the pump to its suction side. The valve 103
erative or when the nozzle valve is closed or nearly closed
will therefore remain closed.
As soon as the nozzle valve 69 is opened even slightly,
even with pump 29 operating, liquid would be forced
a slight vacuum is produced in chamber 91} and when
out the vent pipe which is usually provided on the sep
3,047,011
4
3
be lost through any leaks or breaks therein.
the vacuum reaches a value high enough to enable the
diaphragm 89 to overcome spring 107, valve 103 will open
If the leaks
proportionately.
This then permits liquid to ?ow from chamber $5
through port 101 to chamber 91. When the ?ow of liq
uid through the valve .exceeds the ?ow of'liquid into
chamber 85 through the ori?ce 87, the pressure in the
chamber will drop below that in chamber 33 and when
pump will create the vacuum necessary to openthe valve
the di?erential pressure on the diaphragm is suf?cient to
25 adjacent the pump.
overcome spring 1045, the valve 99 will open to permit 10
it is obvious that various changes may be made in the
form, structure and arrangement of parts of the speci?c
liquid to ?ow directly from chamber 83 to chamber 91
.
in line 303 are substantial, the air ?owing in through
them may be su?icient to prevent the establishment of the
vacuum required to open the valve and in such'case the
system will be inoperative'until the leaks are repaired.
In the case of the use of valves 25 in parallel as shown
in FIGURE 2, by the dashed lines, the operation of any
'
'
-'
'
I '
‘embodiments of the invention disclosed herein for pur
.
'
When this occurs, the movement of valve 99 relative to ‘ . poses of illustration, without departing from the spirit of
through port 97.
metering. element 105' tends to close the port 101 and
more nearly equalize the pressures. in the chambers 83 ‘
and 85 so that the valve 99 will stop. Similarly, the
pressure in chamber 91 tends to increase slightly which
also tends to move valve 103 and metering element 105'
the invention. Accordingly, applicant does not desire to
in a direction to cause 105' to restrict the port 101, and
l. A control valve comprising a body, ?rst and sec
ond displacement means de?ning with said body an inlet
and an outlet chamber, said body de?ning a ?rst port
connecting said chambers, a control valve for said ?rst
be limited to such speci?c ‘embodiments but desires pro
tection falling fairly within the scope of the appended
claims.
We claim:
'
,
_
thus further assists in more nearly equalizing the di?er
ential across the diaphragm 81. Thus the valves quickly
reach a condition of equilibrium in which the opening
of valve 99 is proportional to the rate of ?ow of the liquid
port connected for operation by said ?rst displacement
being dispensed through the nozzle valve.
means, yieldable means for urging said control valve to
Should the nozzle valve be fully opened, a greater vacu
um will be produced in chamber 91 and the valve 103
?rst displacement means for form a third chamber, means
will open to a greater extent.
This results in a Wider
opening of the valve 99 before equilibrium is established
so that again the rate of ?ow of liquid through valve 99
is proportional to the ?ow through the nozzle.
The ori?ce'95 resists the rapid flow of air to and from
' chamber 93 and thus exerts a damping effect to reduce
ove-rtravel of the valve 103 in response to sudden changes
of pressure in chamber 91 and, in turn, the valve 103 re
duces overtravel of the valve 99 to reduce hunting action
and to promote rapid attainment of the equilibrium con
dition.
'
~
' Should the nozzle valve be closed or should the pump
be stopped, the vvacuum disappears entirely from chamber
91 and valve 103 will immediately be closed by spring
107.
As soon as this occurs, the pressures in chambers
ward said port to close it, means cooperating with said
de?ning an ori?ce connecting said third chamber in com- _
munication with said inlet chamber, means de?ning a
second port connecting said third‘chamber in communi-.
cation with said outlet chamber, second valve means
mounted to control said second port and connected for
operation by said second displacement means in a direc
tion to open said second port when a vacuum is applied
to said outlet chamber, yieldable means for urging said ,
second valve means toward said second port, ,said means
de?ning said second port being connected for ‘movement
by said ?rst displacement means and relative to- said
second valve means in a port closing direction, as'said
control valve opens, said second valve means and second
port de?ning means being constructed so as to gradually
increase and decrease the e?ective area of said second‘
and spring 106 will close valve 99 so that no liquid can
port upon relative port opening and closing movement
thereof, said ?rst displacement means being movable in
flow to the dispenser even though chamber 83 is supplied
With ?uid under pressure from branch pipe 26. Valve
response to the opening of said second valve means to .
open said control valve to the degree necessary to estab- '
83 and 85 Will become equalized through the ori?ce 87
103 remains closed as valve 99 closes.
'
.
lish equilibrium between the respective total forces act
It will thus be seen that the ?ow from branch 26 is
held proportional to the ?ow from the nozzle and the
ing on said ?rst and second displacement means.
2. The structure de?ned by claim 1 which includes
, dispenser is protected from excessive pressures which
would tend to make the nozzle valve chatter and become '
means for damping the movement of said second displace-v
unmanageable. Since alli?ow to the dispenser is stopped
3. A control valve comprising a body, ?rst and second‘
displacement means de?ning with said body an inlet and
an outlet chamber, said ‘body de?ning a ?rst portcon
necting said chambers, a poppet type of control valve
for said ?rst portconnected for operation by said first
displacement means to open and close said ?rst port,
when no liquid is being drawn from it, the m'r release will
not ?ood. Similarly, since the valve 99 is closed when
‘the associated pump 29 is not operative, no liquid can
be drawn from the inoperative pedestal and, the air sep
arator will not ?ood.
7' _'
ment means.
' yieldable means for urging said control valve toward said
Illustrative System (FIGURE 2)
port to close it, means cooperating with said ?rst dis
FIGURE 2 illustrates a system in which a motor pump
placement means to form a third chamber, means de?n
type of dispenser 301 is connected to a liquid supply line 60 ing an ori?ce connecting said third chamber in communi
303 which isconnected at its other end to an above
‘ ground supply tank 305 through a control valve 25.
cation with said inlet chamber, means de?ning a passage
through said control valve, said passage having a second
When a single dispenser is used with the line 303, the
valve 25 is preferably located adjacent the tank 305 so
port, connecting said third chamber in communication
with said‘ outlet chamber, second valve means comprising
that it will protect the line as well as the dispenser against C: Ul a pilot valve constructed with a short tapered portion
leakage.
.
.
.
If a number of dispensers are used on the line, a valve
is used adjacent each dispenser in the branch 26 to such
dispenser.‘
As will be understood from the prior detailed explana
having a large included angle and. a metering element
constructed with a relatively long tapered portion having
a relatively small included angle, disposed to open and
close said passage and to increase and decrease the e?ec
tive area of said second port respectively and having a
tion of operation, the valve 25 cannot open until a vacu
stem connected for operation by said second displace
um has been applied to the diaphragm 89, consequently
ment means in a direction to open said passage when a
' in the case in which_valve 25 is disposed adjacent the
vacuum is applied to said outlet chamber, yieldable means
for urging saidsecond valve means toward said second
port, said control valve, when it is moved in an opening
‘tank, until line 303 is evacuated by the dispenser pump,
no liquid can flow through the valve 25 to line 303 and
'
3,047,011
5
6
direction by said ?rst displacement means, serving to
References Cited in the ?le of this patent
move said second port relative to said second valve means
in a direction to reduce the effective area of said sec
ond port, so that the effective area of the second port is
UNITED STATES PATENTS
gradually increased and decreased,
ment of said control valve and said
to the degree necessary to establish
the forces acting on said ?rst and
upon relative move
second valve means,
equilibrium between
second displacement
means.
824,681
1,450,052
2,302,284
2,661,601
2,918,080
2,925,824
Ashley ______________ __ June 26, 1906
Smith ______________ _.. Mar. 27,
Abbott _____________ _- Nov. 17,
Hast ________________ __ Dec. 8,
Heller ______________ _._. Dec. 22,
Rockwell ___________ __ Feb. 23,
1923
1942
1953
1959
1960
4. The structure de?ned by claim 3 which includes a 10
dash pot connected for damping the movements of said
FOREIGN PATENTS
second valve means.
5. The structure de?ned by claim 3 wherein said dash
pot includes a movable control means comprising said
15
second displacement means.
3)
‘l
293,415
885,626
Italy _______________ __ Feb. 20, 1932
France ______________ __ Sept. 21, 1943
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