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Nov, 19, 1946.
Filed June 17, 1942
2 Sheets-Sheet 1
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NOV. 19, 1946.
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Filed June 17, 1942
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Patented Nov. 19, 1946
Albert J. Granbcrg, Oakland, Calif.
Application June 17, 1942, Serial No. 447,421
5 Claims. (01. 73-200)
My invention relates to metering apparatus
for measuring liquids under ?ow conditions, and,
lay valve assembly with the valve in its normal
rest position;
for purposes of illustration, will be described in
- Figure 3 is a similar view showing the same
connection with its application to the dispensing -
valve assembly in fully open position;
of gasoline, oil and the like from trucks to the
storage tanks of service stations, though it is
Figure 4 is a view in section taken on the line
4-4 of Figure 2;
to‘be understood that the ?eld or utility of my in
Figure 5 is a view in section taken on the line
5-5 of Figure 3;
vention is not restricted to such limited applica
Figure 6 is a fragmentary elevational vview of
In the distribution of gasoline, oil, etc., the 10 the apparatus 01' Figure 1, showing a modi?ed
same is discharged from tank trucks as when sup
plying the underground storage tanks of a serv
?ow delay valve assembly;
Figure 7 is a view in section of the modi?ed
?ow delay valve assembly, taken on the line 1-1
ice station i’or subsequent resale to customers.
of Figure 6, and showing the valve in its normally
The trucks are provided with ?uid meters
through which the liquid is caused to ?ow and be 15 closed position; and
Figure 8 is a similar view showing the valve in
measured before entering the discharge hose,
its fully open position.
suitable means usually being associated with the
In general, the objects of my invention are
meter to remove air from the liquid prior to its
realized by interposing in the ?uid path to the
reaching the meter, so as to avoid false readings
during a metering period. It has been found, 20 meter and preferably between the meter and the
air separator, a flow delay valve or equivalent
however, that errors in the meter recordings are
structure, whose function it is to impede the full
often introduced at the very start of a dispensing
?ow of ?uid to the meter during the initial, por
period, the cause being traced to the fact that
tion of a metering period and for a time suffi
at the moment a discharge from the truck tank
cient to permit the air separator to remove ac
is started, the initial ?ow carries with it, through
cumulated air therefrom. Following this, the
the meter, a substantial amount of air which,
line is completely opened to permit continuous
due to leaks or other causes, may have accumu
full capacity ?ow through the meter as long as
lated in the line since the previous discharge, and
desired, the air‘ separator being capable of re
this is particularly apt to be the, case upon the
?rst discharge following the ?lling of an empty 30 moving the air normally present during such full
capacity ?ow.
truck tank.
Referring to the drawings for a more detailed
Among the objects of my invention are:
description, I have illustrated in Figure l. a por
(1) To provide novel and improved apparatus
tion of the line I0 including the meter l2 and the
for the removal of air from the initial flow of
35 air separator I4. The meter, in so far as the com
?uid to the meter;
bination comprising the invention is concerned,
(2) To provide novel and improved means for
need not be limited to any speci?c typebut may
precluding false readings in a ?uid recording
be any meter capable of measuring liquid ?owing
meter, normally attributable to the accumula
therethrough. The particular meter which I have
tion of air in the line, which air passes to the
40 shown for purposes of illustration is of the rotat
meter with the initial ?ow of liquid thereto;
able vane type disclosed ‘in the patent for Fluid
(3) To provide novel and improved apparatus
meter, No. 2,272,170, of February 10, 1942, ‘m
to carry out the foregoing objects, which appara
which I am joint inventor, and, as such, includes
tus shall be compact and emcient in operation.
Additional objects of my invention will be 45 an inlet IE to the interior compartments formed
by the rotatable vanes (not shown), a discharge
brought out in the following description of the
is connecting to a hose 20 and a recorder ‘22 sup
same taken in conjunction with the accompany
ported on the meter and operated usually from
me drawings wherein—
the meter shaft.
Figure 1 is an elevational view of the combina
The air separator may be of any suitable type,
tion comprising my invention, the combination 60 but, for purposes of illustration, I have selected
being made novel by the cooperative inclusion of
an air separator of the type also disclosed in the
a. special ?ow delay valve assembly in a prior
aforementioned patent,.although the same has
known meter arrangement;
been modi?ed toadaptit to the combination of
Figure 2 is a view in section on line 2--2 of Fig
the present case. Brie?y, it comprises a housing
ure 1, showing one embodiment of such ?ow de 65 24, in the lower portion of which lies a cylindrical
?lter 26 extending from the inlet opening to the.
inwardly of the casing 38, whereby the valve in
housing, and in the upper portion of the housing
its normal rest position is partially open to permit
of an initial, though limited, flow movement of
Fluid to be discharged through the meter is
the fluid in the line upon initiating a discharge,
?rst introduced into the lower section through
such initial ?ow to be preferably just about su?l...
the ?lter, to rise into the upper section where any
cient to actuate the valve control mechanism.
air in the fluid has an opportunity to separate
By reason of the valve arrangement just de
out therefrom. The ?oat 30, during high liquid
scribed, it will be noted that the valve is not free
level conditions, serves to hold the air release
to open immediately upon initiating a discharge,
valve 28 closed until the accumulation of air in 10 for the initial pressure surge against the valve
the upper section of the housing lowers the liquid
64 is absorbed in overcoming the static inertia
level and drops the ?oat'sui?ciently to pull the
of the counterweight 54 acting through the link
valve open and permit escape of the air. Air,
in a direction opposing the opening of such valve,
thus released, is conducted through an air tube
and in attempting to force the piston forward
32 back into the main line at the discharge side
against the liquid on the work side of the piston,
of the meter, and in this manner is by-passed
the relief opening 44 being'too small to afford
around the meter and is not conducted through
relief during this initial surge. Following the
it to'give false readings.
initial surge of pressure, the piston becomes re
Ordinarily, the air separator I4 is connected
sistively responsive to the pressure then existing
to feed directly into the meter I2 and it is so 20 in the casing, by reason of the relief opening 44
disposed with respect thereto as to leave the meter
which permits of a slow reduction of back pres
fully primed between discharges. In the im
sure against the work surface of the piston. A
proved apparatus of my present invention, a flow
slow forward movement of the piston will take
delay valve 34 is interposed ‘between the air sepa
place under these conditions until communication
rator and the meter, and preferably disposed 25 between the piston groove 48 and the cylinder
below the ?lter and in communication therewith
groove 52 is established, when the back pressure
and the input to the meter, so that all the liquid
against the face of the piston is suddenly and
‘is an air release valve 28 controlled by a float 30.
must pass through this valve on its way to the
substantially entirely eliminated and the piston
is freed from such restraint. The result is a
The valve 34 is operated through control mech 30 sudden completion of the piston stroke. During
anism 36 which is housed in a casing 38 which
the slow movement period of the piston, the valve
may, if desired, constitute an integral portion of
opening past the gate 64 is substantially un
the air separator housing 24. This casing in
affected, for while the larger portion 12 of the
cludes a cylinder 40 extending outwardly from a
gate is closing, the smaller section 68 is swinging
side wall thereof, the cylinder preferably consti
open, with the net result of substantially no
tuting an independent element securely fastened
in an opening in the wall of the casing and com
change in the opening through the valve.
The sudden and full release of the back pres
sure against the piston is timed to occur when
piston 42 reciprocally mounted in this cylinder,
the larger gate section 12 is substantially closing
is provided with a relief perforation 44 through 40 its portion of the fluid path through the valve
the head 46 thereof, and, further, has its outer
so that a full and complete opening of the valve
cylindrical wall peripherally grooved, the groove
will take place in response to the sudden forward
48 thus formed being made to communicate with
thrust of the piston to the end of its stroke. The
the interior of the casing by a hole 50 through
holding up of the full capacity ?ow during the
the reduced portion of the cylindrical wall. A
resistive responsive period of the piston, which
I longitudinal slot or groove 52 in the interior wall
may be varied to suit conditions by altering any
of the cylinder adjacent its outer end, provides
of the factors determining the period, provides
municating with the interior of the casing. A
open communication between the work side of the
the time interval necessary to remove any accu
piston and the interior of the casing after the
mulation of air from the liquid before sending
piston has traveled but a portion of its full stroke. 50 it on through the meter.
Forward movement of the piston in the cylinder
Restoration of the piston to its normal rest
is normally ‘retarded by a counterweight 54 piv
position upon cessation of flow of fluid through
otally secured to a bracket 56 mounted on an
the line, is assured through the action of the
inner wall of the casing and connected to the
counterweight 54. Its return time may be mate
piston 42 by a link 58 having one end secured i rially shortened by the addition of a valve 14 in
through a hole 60 in the weight, and its other end
the piston head, operative to permit of a quicker
pivotally secured to the piston 42.
interchange of ?uid from the interior of the cas
Also pivotally secured to the piston is another
ing to the work side of the piston on the return
link 62. This link is pivotally secured adjacent
stroke than would be permitted by the relief
its other end, to the valve 34 which in this in 60 opening 44 itself. Such valve may take the form
stance takes the form of an eccentrlcally mounted
of a disc 16 at the work side of the piston and
swingable gate 64 freely supported across the in
slidably secured to the piston head by a stem 18.
put IE to the meter within a frame 66 which is
A perforation 80 or two through the head andv
clamped between the output of the casing 38 and
within the area covered by the disc 16 are thus
the input 16 to the meter. The pivotal connec 65 adapted to be covered during the forward move
tion of the link 62 is to the smaller section 68 of
.ment of the piston, and uncovered during the
the gate. A stop 10 at the edge of the smaller
return movement.
section overhanging the same is adapted to abut
The forward stroke of the piston may be deter
against the inner edge of the valve supporting
mined by impact of the piston against the end
frame 68 to ?x the normal rest position of the 70 of the cylinder 40. I prefer, however, to avoid
valve, which condition exists with the piston in
such impact by terminating the stroke just short
its retracted position, as indicated in Figure 2,
of the end of the cylinder. This I accomplish by
and when no liquid is ?owing in the line.
providing an extension 82 at the gate end of the
The longer section 12 of the valve, of this em
link against whichthe gate will abut as the gate
bodiment of my invention, is preferably bent 75 reaches its maximum desired open position, the
assembly being so designed that this will occur
when the piston has reached the desired end of
its stroke.
In the modi?ed form of valve assembly dis
. closed in Figures 6, 7 and 8, the gate 84 is sub
stantially planar and eccentrically pivoted, but in
1 its closed position, which coincides in this em
ting a sudden and increased velocity of.’ travel of
the piston for the remainder of its stroke.
The forward movement of the piston is‘ against
the action of the spring I22. Consequently. like
the counterweight 54 of the previous embodi
ment, ‘this spring will restore the piston and gate
to their-normal rest positions, upon cessation of
flow of liquid through the line to the meter, the
bodiment with its normal rest position, su?icient
clearance is provided‘ to permit-of an initial but
length of piston rod 'II4 being preferably such ,
considerably limited ?ow, upon start of discharge 10 that the piston I08 does not strike the end of
from the line. The rest position is ?xed by. a
cylinder 88 in approaching its 'rest position.
valve seat ?ange 85 extending inwardly on frame
It is noted in connection with this second em
bodiment, that the turning moment on the'gate
The valve control mechanism 86 includes a cyl
: during the initial or resistively responsive portion
inder 88 terminating in a threaded plug 90 where 15 of the piston stroke is quite small. This adds
by it is aiiixed to the wall of the casing 38. The
somewhat to the load resistance of the piston
cylinder is formed with an integral angularly
and, consequently, has the effect of increasing
disposed offset 92 adjacent the casing wall in
the hold-back period. Of course, the length of
which the cylinder is mounted. The offset has a
such period may be increased or decreased to suit
bore 94 longitudinally therethrough communi 20 conditions, not onlyby the adjustment screw I24
cating with the interior of the cylinder adjacent
but by utilizing a stiffer or weaker spring, as
the casing wall and, by means of a hole 96
through the plug, such communication is extend
While I have described two embodiments of
ed into the casing. The offset bore is closed at
my invention, the same is susceptible to change
its outer end by a screw closure 98 threaded 25 and alteration, without departing from the spirit
therein, and is intersected at an intermediate
thereof, and I accordingly do not desire to limit
point by a longitudinal. passage I00 provided
my protection to the speci?c details of these em
within the wall of the cylinder. This longitudi
bodiments, except as may be necessitated by the
nal passage communicates with the interior of
appended claims.
the cylinder at longitudinally spaced points 30 I claim:
through a pair of perforations I02 and I04, re
1. In combination, a ?uid meter, air-separa
spectively, the ?rst at substantially the halfway
tion means associated with liquid ?ow to said
point and the other adjacent the end of the
meter to separate air from liquid during normal
cylinder. The construction of the cylinder may
?ow of such liquid to said meter, flow delay
be facilitated by forming it open ended and cap 35 means extending only partially across the ?ow
ping the open end with a plate I06 bolted there
path to said meter at all times in the absence of
?ow therethrough to permit an initial reduced
The piston may be of the cupped leather type,
flow of liquid thereby to said meter, said ?ow
that is, formed by a leather cup seal I00 held
delay means being activated by said initial re
between rigid discs H0 and H2, respectively, and 40 duced ?ow of liquid and including a slow release
mounted at the end of a piston rod H4. The
type “valve assembly for precluding full flow
piston rod extends through the center of the plug
during a time period su?icient to permit said air
90, and into the casing. At its inner end, is
separation means to free the initial portion of
mounted a two prong fork or guide IIG which
liquid of excessive amounts of air trapped therein.
extends toward the gate 84 and straddles a pivot
2. In combination, a. fluid meter, air-separa
pin II8 carried between a pair of ears I20 on the
tion means associated with liquid ?ow to said
smaller section of the gate. A compression spring
vmeter to separate air from liquid during normal
I22 surrounding the piston rod exerts continuous
flow of such liquid to said meter, a normally par
pressure against the fork IIB, thereby tending at
tially open ?ow controlled valve assembly, said
all times to hold the piston in retracted position
valve assembly being resistively responsive to
and the gate in its normal closed position as illus
the initial flow of liquid to said meter during a
trated in Figure 7.
metering operation and including time delay
In the set-up just described, the bore opening
means independent of liquid level for delaying
94 through the angular offset 92 functions in the
full opening of the valve of said assembly, for
same capacity as the relief opening 44 in the
maintaining a reduced initial ?ow ‘of liquid
through said meter over an initial time period
?rst embodiment described, since it maintains
to permit said air-separation means to free the
restricted communication between the work side
of the piston and the interior of the casing during
initial portion of liquid of excessive amounts of
air trapped therein.
movement of the piston from its normal rest posi
tion to the opening I02. Such bore opening may 60
3. In combination, a fluid meter having an in
be a ?xed unobstructed opening of limited size,
let passage thereto for liquid to be metered, air
but I prefer to make it over-size and adjust its
separation means in the path of ?ow of such
effective size by an adjusting screw I24 threadedly
liquid to said meter for removal of air from such
liquid existing therein during continuous ?ow
received in the bore. This allows of substantial
thereof to said meter, a gate in the inlet passage
leeway in manufacturing tolerances, as the ad
to said meter, and means independent of liquid
justment permits regulation of the rate of travel
level, resistively responsive to the initial flow of
of the piston during the initial portion of its
liquid through said meter and cooperating with
forward stroke whereby the duration of the hold
said gate to retard the full opening of said gate
back period may be controlled.
After passing the opening at the halfway mark, 70 for a period of time following the start of such
liquid flow.
this opening I02 then provides enlarged ?uid
4. In combination, a ?uid meter having an
passage between the work side of the piston and
inlet passage thereto for liquid to be metered,
the interior of the casing, and the resistance pre
viously encountered against the work surface of
air-separation means associated with the flow
the piston is essentially eliminated, thus permit 75 of such liquid to said meter for removal of air
from such liquid existing therein during con
‘ 8
liquid to said meter for removal 01' air from such
tinuous ?ow thereof to said meter, a valve in the
liquid existing therein during continuous ?ow
inlet passage to said meter normally only par
thereof to said meter, a normally partially open
tially closing said passage to permit of an initial
valve in the inlet passage to said meter, valve
reduced ?ow oi’ liquid thereby, means normally
control means independent of liquid level, re
tending to hold said valve in said partially clos
sistively responsive to the initial ?ow or liquid to
in; condition, and piston means resistively're
said meter and cooperative with said valve to re
sponsive to said initial ‘?ow oi.’ liquid to‘ said meter
vtard the full opening 01' said valve for a period
for gradually overcoming the closing e?ect of
or time following the start 01' such liquid ?ow,
said closing means and causing a delayedopen 10 and means for restoring said valve to its partially
ing of said valve.
open condition upon cessation of liquid ?ow to
5. ‘In combination, a ?uid‘ meter having an
said meter.
inlet passage thereto for liquid to be metered, air
' separation means in the path of ?ow of such
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