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Патент USA US2106651

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Jan. 25, 1938.
w. H. PARKER ET AL,
2,106,651
PI STON METER
Filed April 9, 1954
s Sheets-Sheet 1
@
Wv
IN VENTORS.
WHLTER hi PHRKER,
NELSON J- SE/5ER7'
i .167
BY
Jm»//$%m
ATTORNEYS
Jan. 25, 1938.
w, H, PARKER ET AL
PISTON METER
_
2,106,651
-
Filed April 9‘, 1954
3 Sheets-Sheet 2
we,
INVENTORS.
WALTER H- PARKER,
-
NELSON J. SE/BERT.
ATTORNEYS
Jan. 25, 1938.
w. H. PARKER El‘ ‘AL
2,106,651
PISTON METER
Filed April 9, 1934.
5 Sheets-Sheet‘ 5.
2,106,651
Patented Jan. 25, 1938
UNITED STATES PATENT OFFICE
2,106,651
'
PISTON METER
Walter H. ParkeiyPittsburgh, and Nelson J. Sci
bert, Wilkinsburg, Pa., assignors to Pittsburgh
‘ Equitable Meter Company, Pittsburgh, Pa., _ a
corporation of Pennsylvania
I
_
Application April 9, 1934, Serial No. 719,788
12 Claims. v(Cl. 73-247)
This invention relates to ?uid meters of the
a unit from the meter for purposes of inspection
and repair.
relates to that type of meter known as piston
Other objects of the invention will be apparent
meters.
I
from a consideration of the following speci?ca
01
In ?uid meters of this type the measurement tion taken in connection with the annexed draw
5
of ?uid is accomplished by displacing a plurality. ings and in which:
positive displacement type, and more particularly
of pistons located in suitable cylinders, and the
movement of the pistons is transmitted through
suitable mechanism to a register. A valve which
is timed in relation to the movement of the pis
tons alternately admits and discharges ?uid to
and from these cylinders in proper sequence.
In meters of this type it has heretofore been
proposed to calibrate the displaceable volume of
the cylinders by limiting the movement of one
of the pistons. This has been found somewhat
disadvantageous as the timing of the valve which
must be set so as to permit the proper sequential
intake and discharge of ?uid to the cylinders, and
at the same time prevent hydraulic locking of the
pistons at the extremes of their strokes becomes
more or less a complicated operation.
Figure 1 is a vertical section of a preferred em
bodiment of the invention;
Figure 2 is a top plan view of the removable
bottom cover and stroke‘adjusting means of the
modi?cation shown in Figure 1;
10
Figure 3 is a vertical section of the valve cage
taken at an‘ angle 45” to the section shown in
Figure 1;
_
Figure 4 is a fragmentary vertical section of a 15
second preferred modi?cation of my invention
shown in a manner similar to Figure 1;
Figure 5 is a horizontal sectional view on a
slightly reduced scale taken on line V--V of Fig
ure 1 in the direction of the arrows, the cranks
being rotated through 90° from their position as 20
In con
shown in Figure 1;
structions heretofore proposed the means provid
Figure 6 is a diagonal sectional view of the
ed in most cases'for adjusting the stroke of the casing ona slightly reduced scale of the modi?
pistons has not been satisfactory due to their in
cation shown in Figure 4 corresponding to a sec
ability to compensate for wear. Further, piston - tion taken on line VI-VI of Figure 5 in. the
meters of prior types generally involve a large direction of the arrows;
number of parts, are expensive to manufacture,
Figure‘ 7 is a top plan view of the valve cage
and do not provide for proper adjustment of the of the modi?cation shown in Figure 4, the top
30 valve to compensate for wear or other factors
affecting the accuracy and timing of the valve.
Accordingly, it is an object of the present in
vention to provide a piston meter having a novel
means for adjusting the stroke-of one or more
35
Figure 8 is a vertical section of a further pre 30
ferred modi?cation showing a modi?ed valve
structure;
Figure 9 is a horizontal fragmentary section on
sets of the pistons to permit accurate calibration
of the displaceable volume of the cylinders in a
the line IX--IX of Figure 8 showing the valve
35
structure and valve seat;
manner to properly compensate for wear.
Still another object is the provision of a piston
meter having a novel type of valve for distribut
modi?ed yoke slot and valve driving crank; and
ing liquid to the cylinders, which is of simple con
struction and inexpensive to manufacture, and
Figure 10 is a fragmentary sectional view of a
Figure 11 is a fragmentary sectional view of a
modi?ed stuffing box.
Referring to the drawings, Figure 1, the meter 40
can be easily adjusted or timed in relation to the
comprises a casing I0 preferably formed as a
pistons.
casting which houses the working parts of the
Still another object is the provision of a novel
unitary assembly comprising a readily adjustable
valve and cage supporting the crank shaft which
is removable as a unit for inspection or grinding
and can readily be replaced with the assurance
of being returned to its proper alignment.
Still a further object of this invention is ‘the
provision of a novel calibrating mechanism for a
plurality of pistons in a piston meter, an equal
55
spider being removed; _
ized adjustment being readily secured, the entire
adjustment assembly being readily removable as
meter. The casing of all the modi?cations is
similar and will be described in detail with ref 45
erence to Figures 1, 5, and 6. The casing ID has
a pair of aligned cylinders II, II’ and I2, I2’
formed therein (Figures 1 and 5), and the cylin
ders have replaceable bronze or brass liners l3
tightly ?tted therein and are closed at their outer 50
ends by suitable cylinder heads bolted or other
wise secured to the casing. Two pairs ‘of con
nected pistons l4, l4’ and l5, l5’ operate in the
cylinders, and as they are alike in construction,
only one will be described in detail.
55
2
2,106,651
The pistons of the assembly as shown, for ex—
ample, by piston I 0 (Figure 8) comprise a head
I6 and an annular retainer I'I secured thereto by
screws I8, a ?exible cup or washer I9 of leather,
rubber or other suitable material, being clamped
therebetween. The retainer I‘! has its periphery
recessed as shown at 20 and within this recess is
located a coil spring 2| formed into an annulus,
the ends of the annulus being soldered to a plug
(not shown) inserted into the spring at each end
to reinforce the soldering joint. This spring
serves to keep the ?exible washer I9 resiliently
engaged against the walls of the liner I3 to pre
vent leakage therebetween. The pairs of pistons
15 Ill and Ill’ are secured together by a Scotch yoke
22 (Figures 1 and 5) having lugs at its ends to
which the pistons are secured by screws 23. The
similar Scotch yoke 20 joining the other pair of
pistons I5, I5’ crosses the yoke 22 at the center.
The casing I0 has a central vertical bore 25
through the top connecting with an interior
chamber 26, and having a shoulder 21 at the
bottom thereof and a shoulder 28 at the top. A
cylindrical valve cage 29 is located in said bore
25 and comprises a lower ?ange 3| seated on the
step 21, an upper ?ange 32 seated on the upper
step 28, suitable gaskets being inserted therebe
tween, and said ?anges are connected by four
vertical bars or spacers 33 which are 90° apart
30 from center to center.
The cage is secured in
place by screws 34 passing through the top
?ange. The passages 35 through the body,
which are parallel to the cylinders, are divided
by walls which terminate in vertical ribs or
spacers 36, and the cage 29 is so positioned that
the outer edges of the vertical bars 33 abut these
ribs in ?uid tight engagement.
The lower ?ange 3! has four radial webs or
spokes 3‘I integral therewith which support a
40 central hub 38, and the crank shaft 39 is jour
nalled therein in suitable bushings. The crank
shaft 39 has a crank arm 03 pinned thereto at
its inner end and a crank pin 00 is forced into a
suitable bore in the outer end of crank arm 03,
45
and is nonrotatably secured therein by a cross
pin 45 passing through a slot 66 in the crank
arm. A pair of bushings or rollers 01 and 00 are
rotatably mounted on the crank pin '44 and are
retained in place by a washer 69 seated on a
shoulder of the pin 40 and a nut 5| threaded onto
the reduced threaded end of the crank pin. The
crank pin 00 passes through an elongated slot
52 formed in the yoke '22 the width of the slot
being slightly greater than the diameter of bush
ing 48,_and an elongated slot 53 is formed in
55
the yoke 24 at right angles to the slot 52, this
slot likewise being slightly wider than the bush
ing 41. This construction permits the yokes 22
and 24 to reciprocate successively with their
60 pistons and at the same time to rotate the crank
arm 43 and hence rotate the crank shaft 39.
The pistons are adapted to be reciprocated by
the ?uid to be measured, and a rotary valve is .
provided to successively admit and discharge liq
65 uid to the cylinders in the proper sequence. The
valve cage has a cylindrical seat 54 therein, (Fig
ures 1 and3) and a cylindrical valve member 55
(Figures 1, 4, and 7) is rotatably mounted there
in and rests upon a step 56 formed on the bottom
?ange 3| of the valve cage. The cylindrical
valve is divided into two compartments by a
diagonal dividing wall 51 integral therewith,
and in the modi?cation shown in Figure 1, it has
a central hub 58, and a bushing 59 is located in
75 the hub to rotate with the valve. The bushing
59 has a ?ange 3i- which is cut away to form a
tongue 62 and in assembly this tongue ?ts into a
recess 63 formed in the collar 64 suitably pinned
to crank shaft 39 whereby the valve is rotated
upon rotation of the crank shaft. The collar 64
limits downward movement of the crank shaft.
The bushing 59 is temporarily .secured within the '
hub 58 by a set screw (not shown) threaded into
hole 69 in the hub 58, and after the valve is cor
rectly timed with the pistons the bushing is per
manently secured to the valve by a plurality of
pins ‘H passing through holes drilled there
through in assembled position.
.
The cylindrical valve 55 which is diametrically
divided by the diagonal wall 51 has two ports ‘I2
and ‘I3 (Figure ‘7) which are slightly greater
than 90° in extent and are separated by cylin
drical lands which are slightly less than 90° in
extent, the lands being bisected diagonally by
the dividing wall. A spider ‘I0 suitably secured
to the top of the valve cage carries a bushed
central hub ‘I5 which provides an additional
bearing for the crank shaft 39. The upper end
of the crank shaft is slotted as at 16 (Figure 4)
and is coupled by a pin 'I‘! to a register drive
shaft ‘I8 which passes through a stuf?ng box 19
in cover 8| (Figure 1) or 8I’ (Figure 4) to drive
a register (not shown) suitably supported there
on, and the cover provides a distributing cham
ber 82 normally ?lled with liquid which enters 30
through a suitable inlet 83 (Figures 5 and 6).
The stuf?ng box ‘I9 (Figure 4) comprises bush
ing 80, a spring 85, a retainer washer 86, pack
ing 81 and a gland or follower 88 bolted to the
cover. A washer or stop 89 is spun onto the .
lower end of the register shaft ‘I8 and limits up
ward movement thereof.
The modification shown in Figure 4 is similar
in many respects to that of Figure 1. In this
modi?cation the upper ?ange ml of the valve
cage 29 is slightly modi?ed and is secured di
rectly to the meter casing by bolts I02 passing
through elongated slots I03 (Figure 7) in the
?ange. The crank shaft 39 has a collar I00
pinned thereto, and a vertical pin I05 is secured 45
in the collar and cooperates with a bore I06 in
the hub 58 of the valve whereby the valve is
driven. The collar I05 limits downward move—
ment of the crank shaft 39. The upper ?ange
IOI and the lower flange 3|’ of the valve cage _
are joined by similar vertical bars 33. The
spider ‘70 is secured by screws I0'I threaded into
the holes I08.
Provision is made for adjusting the stroke of
the pistons so that the meter can be calibrated 55
accurately. The open lower end II2 of the cas
ing I0 is closed by a suitable cover II3 bolted or
otherwise secured thereto, and having a central
hub H0 and a vertical bore I I5 therein in which
a guide II6 having an equalizer H1, at one end
is slidably located. Equalizer II'I preferably is
formed with a relatively thickened rim which
is substantially ‘circular in cross section, as
shown in Figure 1. A pin H8 is threaded into
the equalizer and is adjustably locked in place
by a nut M9, the pin II8 serving to limit the
downward movement of the guide and equalizer.
The cover II3 carries four pairs of lugs I2I,
I2I' (Figures 1 and 2) between which are piv
oted the three L-shaped adjustable stops I22,
and a fourth stop I23 on pins I24 passing there‘
through. The stop I23 has an extension I23’ at
its lower end. These stops are bifurcated at
their inner ends to form rounded recesses which
closely engage the thickened rim of equalizer
3
2,106,651
III. The extension I23‘ has a stub I25 at its
lower end about which a spring I26 is located, the
other end of the spring being received in a recess
I21 located in the central hub II4 of the cover,
I35. The crank shaft I36 is suitably journalled
in bushings in hub I32',‘an/d at its lower end is
the spring biasing the stop I23 radially inward.
and a dog I38 having a slot I39 at its outer end Cl
secured the crank arm 43.
At its upper end a
spacing sleeve I3‘I surrounds the crank shaft,
The side of extension I23’ opposite to that is pinned to the crank shaft. The casing I0 has
mounting stub I25 is contacted by an adjusting a plane valve seat HI," and the central bore I30
screw I28 threadedly mounted in bore I29. An' passing therethrough provides an exhaust port
enlarged bore I32 is provided to accommodate to the central chamber of the meter. The in
10 the head of screw I28, a locking member I3I
take ports 35 to the cylinders connect with the 10
and a sealing plug I33 which may be sealed inlet ports I42 in the valve seat I4I, surrounding
against unauthorized tampering in any desired the central outlet port I30.
I
manner.
The pistons are adapted to be reciprocated by
In operation, liquid is supplied to the dis
the fluid to be measured, and a valve is provided
tributing chamber 82 from the inlet 83 and pass- . to successively admit and discharge liquid to
ing downward through the spider ‘I4 is directed by these cylinders in the proper sequence through
the diagonal wall 51 and port ‘I3 into the spaces the four inlet ports I42 and inlet passages 35
between the cage bars 33 which communicate which connect with the cylinders adjacent the
with a passage 35 leading to the end of cylinder heads thereof. A hollow generally cup shaped
II’ (Figure 5) and at the same time the exhaust valve member I43 is seated on the valve seat I“, 2,0
port ‘I2 is in communication with the diametrical
this valve member being shown in Figure 8, 90°
ly opposite passage 35 leading to the‘end of cyl
out of time with the pistons I4 and I4’ for the
inder II, and conducts discharged liquid down . purposes of illustration. In a thickened lug I44
ward through the spokes 31 to the interior cham
25 ber 26, ‘and thence through an outlet 9| from the
in the top of the. valve is formed a recess I45
meter. Thus, one cylinder II’ is receiving liquid
while the opposite cylinder II is discharging
liquid, while the pistons I 5 and I5’ are at the ends
of their respective strokes and the lands of valve
55 seal the cylinders I2 and I2' from communi
cation with inlet or outlet ports. As shown in
to receive, the upper end of the crank shaft I36,
and the slot I39 of driving dog I38 engages a pin
I46 pressed through the top of the valve member
whereby the valve is rotated with the crank shaft.
The valve is covered by a. cover I41 which pro
vides a distributing chamber I48 normally ?lled 30
with liquid which enters through a suitable inlet
Figure 5, the crank pin 44 is on dead center with
respect to pistons I5 and I5’ when valve 55 is in
the position shown in Figure 7. Further move
I50 (Figure 9). A register driving shaft I49
passes through the top of the cover I41, and at
35 ment of pistons I4’ ‘and I4 rotates pin 44 in'the
direction of the arrows o? of dead center and
its lower end-has secured thereto a slotted driven
dog or crank I5I which engages the pin I46
rotates valve 55 to admit liquid to cylinder I2’,
while liquid from cylinder I2 is discharged as pre
whereby the shaft is- rotated. A gland I52
threaded upon a suitable lug I53 in the cover
provides a packing chamber I54 surrounding
viously described. The circumference of the
valve ports ‘I3 and ‘I2 is less than the space be
tween adjacent bars 33 which in connection with
past the shaft.
the register shaft_to prevent leakage of liquid
'
40
The valve I43 as shown in Figure 8 is generally
crescent shaped so that one inlet port I42 to each
pair of cylinders is at all times in communication
with the distributing chamber I48, and one port
the timing of the valve prevents hydraulic lock.
The meter is calibrated by adjusting the stroke
of the pistons. The stops I22 and I23 pivot about
their respective pins I24 in unison, their pivotal I42 of each of the opposite cylinders is at the 45
movement being equalized by the equalizer III same time connected with the interior chamber
which is engaged by the bifurcated inner ends
I55 of the valve I43 and is discharging through
thereof. These stops are biased inwardly by the central port I30. Short circuiting of in
spring I26 and outward movement is limited by coming liquid is prevented by the lands I56 and
the setting of screw I28, which limits the inward
I5‘! (Figure 9) which are about 90° apart and
strokes of the pistons. By omitting certain of the bear against the valve face I4I of the casing I0
stops I22, adjustment may be limited to as few
and close off that part of a port I42 which is re
as one set of pistons.
ceiving incoming ?uid, from communication with
The valve 55 in the modi?cation shown in‘ Fig
ure 1 is adjusted or timed in relation 'to the
the'interior chamber I55 of the valve. Suitable
lubricating holes I58 are provided in .the lands
piston cycle by rotating it relative to the bush
to supply ?uid to the valve seat and lubricate the
ing 59. In the modi?cation shown in Figures 4E‘ same. The liquid which passes into the central
and 7 the valve is adjusted with relation to the chamber ‘26 is discharged therefrom through the
piston cycle by rotating the valve cage 29. For outlet port 9| as in the modi?cation previously
this purpose the cage is provided with slots I03 to
v described.
60
permit the cage to' be rotated relative to the
In the modi?cation shown in Figure 10, the
valve 55 which is ?xed on shaft 29 by means of ‘slots 52 and 53 are lined with nitrided steel or
driving pin I05 engaging recess I06. The valve similar wear resistant liners. The liners I6I are
_is readily removable by removing the cover 8|, located on both sides of the slots and are se
and the spider ‘I4, whereupon the valve can be cured in position by suitable rivets I62 at each 65
lifted from its cage.
The modi?cation shown in Figure 8 involves a
end which pass through the lugs I63 provided
therefor on the yokes, the inner ends of the rivets
further modi?ed valve structure. The casing ‘being ?ush with, the inner surface of the liner.‘
I0, which is similar to that shown in Figures 1, The rollers 41 and 48are pressed onto'bushings
5, and 6, has a central passage I30, and a spider
I3I' supports a central hub‘ I32’ mounted there
in. The spider comprises a ring I33’ seated in a
suitable recess I34 surrounding the passage I30
and bolted to the casing, and the central hub
75 I32’ is supported by a, plurality of radial spokes
I64 of self vlubricating bronze and are ~journalled 70
on crank pin 44.
_
,
The modi?ed stu?ing boxgshown in Figure 11
comprises a hollow internally threaded lug I65
‘on the upper surface of cover I 41. The register '_
driving shaft I49 passes through a packing recessil'75
4
2,106,651
I66 which contains a washer I61, packing ma
terial I68 and a follower I69 threaded into the
lug I65, and a gland III. The packing is com
pressed by screwing follower I69 into lug I65.
said cage, a register drive shaft extending
through said cover and forming with said crank
The invention may be embodied in other spe
ci?c forms without departing from the spirit or
ing relatively the timing of said valve and cage. U!
essential characteristics thereof. The present
embodiment is therefore to be considered in all
respects as illustrative and not restrictive, the
10 scope of the invention being indicated by the
appended claims rather than by the foregoing
shaft an interlocked connection, and a rotatable
valve located in said cage, and means for adjust
6. In a ?uid meter, a casing having a plurality
of cylinders therein formed radially about a com
mon center, and having an opening in one side
thereof, pistons arranged to operate in said cyl—
inders, a cover for closing said opening, an equal
izer guided for vertical movement in the cover, a
description, and all changes which come within
the meaning and range of equivalency of the
claims are therefore intended to be embraced
plurality of stops pivotally mounted and engaging
said equalizer, and means extending through said
therein.
stroke of said pistons.
.
What is claimed and desired to be secured by
United States Letters Patent is:
1. In a ?uid meter, a valve cage having a cy
lindrical valve seat therein and connecting bars
20 joining the upper and lower ?anges thereof, a
cover for radially adjusting said stops to vary the
,
7. In a ?uid meter, a casing having a plurality
of cylinders formed radially about a common
center, and having an opening in one side there
of, pistons arranged to operate in said cylin-'
ders, a cover for closing said opening, an equalizer
hub centrally supported by spokes integral with
comprising a disk with a thickened rim substan
said lower ?ange, a spider removably secured to
the upper ?ange of said cage, a crank shaft
rotatably journalled in said hub and spider, a
collar pinned to said shaft to limit downward
movement thereof, a valve seated in said cage,
a longitudinal pin in said collar and ?tting into
tially circular in cross section guided for vertical
movement in the cover, a plurality of stops piv
otally mounted and having rounded recesses en
gaging the rounded rim of said equalizer, and 25
means extending through said cover for radially
adjusting said stops to vary the stroke of said
a recess in said valve for driving the same.
pistons.
2. In a positive displacement meter, a valve
30 cage comprising an upper and a lower ?ange and
bars joining said ?anges, a hub centrally sup
ported by spokes integral with the lower ?ange,
a spider removably secured to the top of said
cage, a valve drive shaft journalled in said hub
and spider and having a collar secured thereon,
a cylindrical valve seated in said cage, said valve
having a central hub, and a bushing located in
said hub of the valve and ?xed thereto and
having a tongue and groove connection with said
40 collar for rotating said valve.
3. In a ?uid meter, a casing having a plurality
of cylinders therein formed radially about a
common center, and having an opening formed
in one side thereof, pistons in said cylinders,,a
cover carrying adjusting mechanism closing said
opening, said adjusting mechanism comprising a
8. In a ?uid meter, a casing having a plurality
of cylinders therein radially disposed about a :
common center, pistons arranged to operate in
said cylinders, a plurality of adjustable stops piv
otally mounted independently to engage said pis
tons to control the strokes thereof, means to ad
just one of said stops and equalizing means to 35
communicate movement of one stop to said re
maining stops.
9. In a ?uid meter, a casing having a plurality
of cylinders therein radially disposed about a
common center, pistons arranged to operate in 40
said cylinders, a plurality of adjustable stops
pivotally mounted to engage said pistons to con
trol the strokes thereof, means to adjust one of
said stops and equalizing means associated with
said stops and arranged for movement substan 45
tially normal to the axes of said cylinders to
plurality of individually pivoted stops adapted to
communicate said adjustment to said remaining
be engaged by said pistons at the inner limit of
their stroke, means to'interconnect said stops
stops.
50 so that movement of one stop due to engage
ment by a piston will effect movement of all stops‘
‘
10. In a ?uid meter, a casing having a common
?uid distributing chamber and a plurality of 50
cylinders on one side of said chamber and pro
and means extending through said cover for ra
vided with inlet passages opening into said com
dially adjusting said stops to thereby vary the > mon ?uid distributing chamber and providing
stroke of said pistons.
shoulders on both sides of said passages in said
4. In a ?uid meter, a casing having a plurality distributing chamber, a removable cover for said 55
55
of cylinders therein formed radially about a com
chamber on the side of said chamber opposite
mon center, and having an opening in one side said cylinders, pistons in said cylinders, a valve
thereof, pistons in said cylinders, a cover car
cage having ?anges engaging said shoulders in
rying stroke adjusting mechanism for closing said
60 opening, said cover having a central bore, a
guide vertically reciprocable ‘in said bore and
having an equalizer at one end thereof, a plu
rality of stops pivotally mounted and engaging
said equalizer, and means extending through said
65 cover for radially adjusting said stops to vary the
stroke of said pistons.
5. In a ?uid meter, a casing having a. plurality
of cylinders therein formed about a common cen
ter, a plurality of pistons in said cylinders, said
pistons being interconnected in pairs, means for
adjusting the stroke of said pistons, a valve cage
secured‘in said casing and including an integral
hub, ‘a spider removably secured to said cage, a
crank shaft journalled in said hub and spider,
75 a cover providing a distributing chamber over
sealing relation thereto, the openings of said cage
registering with said passages, a valve seat in 60
said cage, a valve seated therein and adapted to
be rotated by said pistons and means accessible
upon removal of said cover releasingly securing
said valve cage in position and allowing rotation
65
of the cage for adjustment thereof.
11. In a ?uid meter, a casing having a ?uid
distributing chamber and a plurality of cylinders
on one side of said chamber, pistons in said cyl
inders, ?uid passages connecting said cylinders
with said chamber, a valve cage in said distribut
ing chamber, a valve seated therein arranged to
be rotated by said pistons, said casing having a
removable cover for said chamber on the side
thereof opposite said cylinders, and means ac
75
2,106,651
cessible upon removal of said cover to adjust said
valve cage.
I
12. In a ?uid meter, a casing having an open
ing in one side thereof, a cover for said opening,
~a plurality of cylinders in said casing, a ?uid
distributing chamber de?ned by said cover and
a portion of said casing, said cylinders and said
chamber being connected by a plurality of ?uid
passages, pistons in said cylinders, a valve cage
10 positioned in said casing in ?uid tight engage
.5.
menttherewith and between‘ said cover and said
cylinders, an. operating shaft arranged to be
driven by said pistons, a valve seat in said
cage, a valve in said seat secured to said shaft
to be rotated tliereby, andmeans in said ?uid '
distributing chamber between said valve cage and
said cover for adjustably securing said cage to
said casing.
'
.
WALTER H. PARKER.
NELSON J. SEIBERTJ
10
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