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Патент USA US2118234

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May 24, 1938.
H_ E, Rupp
2,118,234
RECIPROCATING LIQUID PUMP
Filed NOV. 20, 1936
20
19
76
I7
INVENTOR.
BY
Herbe/‘ú E Rupp
ATTORNEYS, ~
Patented May 24, -193s _
n .2,118,234z
UNITED >STATES. PATENT --OFFICE
.
2,118,234
nacirnocATING LIQÚm PUMP
.
‘f
Herbert E. Rupp, Mansiìeld, Ohio, assignor to
Gorman-Rupp Company, Mansiield, Ohio, a
corporation of Ohio
Application November 20, 1936, Serial No. 111,910
13 Claims. (Cl. 103-203)
This invention relates to liquid pumps and body proper, and the plunger opening into the
more particularly to pumps of the reciprocating
water passage having a. valve-controlled air-re
type, having- reference to improvements inthat
lease vent connection with, or opening into, the
class of such devices, commonly known as pres
air chamber or space.
sure and suction pumps, wherein one or more
In the illustrative construction the pumping
chamber is formed in fa lower casing l, having an
inlet passage 2 and a discharge passage 3, which
plungers actuated by a drive transmission are
operable on water with a high pressure head or
force.
‘
-
One of the objects of the invention is to pro
10 vide a pump in which the crankshaft or other
means of translating rotary motion into recipro
catory motion is superimposed over the plunger
,
latter are shown in extension from the sides
opposite each other at different or stepped levels.
The inlet passage is controlled by a valve 4 and 10
the discharge passage is controlled by a valve 5,
both of the same being preferably one way self
seating valves. Above each of said valves a plug
or water end of the structure and~a lubricating
system is incorporated therein whereby the mo ' cap 6 is advantageously fitted into _hand-holes
15 tion changing mechanism operates partially sub
merged in the lubricant and the entire working
mechanism is automatically and thoroughly lu
bricated.
_
Another object is to provide means in the struc
tural organization of thev pump for constantly
and without any manual attention relieving the
same of any air or gas that may enter thereinto
and so eliminate the possibility of any air accumu
the casing walls for cleaning, repair or replace
ment. Between these two valves and the pas
sages controlled thereby a plunger, or plungers,
, 1 working through the casing top extends down
wardly into the central space or pumping cham
ber 8 formed therebetween. A plug-cap 9 fitted 20
into an entry hole in the bottom of the casing
opposite said plunger provides for expedient ac
which
cess thereto for adjustment or replacement, as
will be later described, as well as a means of
A further object is to provide for the pump air
clearing out the pumping chamber space.
This arrangement permits solids which are
heavier than the pumped liquid-and which are
almost invariably picked up and carried thereby
lation
v25
provided to afford ready access thereto through
or . counter-pressure
generation
might impair its effective operation.
chamber to be replenished continually with air,
which is more or less subject to absorption in all
liquids under pumping action and is of course nec
30 essary in the regular and proper operation of all
pumps of the kind.
Other objects together with some of the par
into the pump-to drop ~laway from the plunger 30
and more particularly from the packing, later
described, therearound so as to keep the same
ticular advantages of the invention will be set free from the impact and wear and from the scor
forth in the following description with reference ` ing which usually results from such solids or other
35 to the attached drawing, wherein one practicable foreign matter entering with the liquid stream, 5
embodiment of the same is illustrated in the necessitating costly repairs. It also enables the
casing and its passages to ybe easily and expedi
somewhat conventional character of a pump in
tended for heavy duty use.
- tiously freed of any solid or foreign matter that
In said drawing:
might become lodged therein, in addition to
The single figure is a vertical or longitudinal l affording ready access to the several working
40
section representation of the pump as viewed parts named.
The aforesaid plunger 1 is surrounded by a
from one side, a portion thereof, seen in elé'va
tion, being broken away fragmentarily to reveal packing I0 ñtted into a stuffing-box recess formed
a part enclosed thereby.
in the top of the casing just above the plunger
Broadly the, invention consists of a- closed opening thereinto, and this packing is held by a
gland-plate I I shown bolted to the casing top. A
crankshaft mounting on or over a plunger cylin
der opening downwardly into a valve-controlled central counter-bore or channel I2 formed in said
waterlpassage having an offset air chamber or plate aroundthe plunger body,«being annular in
space„` the crankshaft being connected with the this instance, provides for any water that may
plunger through a sealed bottom portion of its leak up past the packing to be retained there- 50
casing and having a crank-arm guide or piston within and so form an effectual seal against the.
member working in said bottom portion so as to
force lubricant- upwardly through a take-off side '
55
wall conduit into jet discharge upon the crank
throw and bearing and back into the casing
admission of air down along the plunger on its
suction'stroke. Now various pumps of general
construction somewhat similar to that thus far
described have been produced and proposed. But
'
2
r
- 2,118,234
none of these, insofar as this applicant is aware,
withv air which is constantly being absorbed by
has been free of or eliminated certain objection
the water under pumping operation, especially
when -the air and liquid are under great pressure.
impair the full efficiency and satisfaction of op
This continual supply of air to the air chamber,
eration oi' such pumps. One of these factors is of course, maintains the volume of separated air
the collection and continuing presence of air ' therein suillcient to maintain an effective cushion.
around the plunger at the point or regional space
Adjacent to the air chamber, a gauge tube I8
of its entry into the pumping chamber, due to the » is advantageously fitted in corresponding lateral
able and undesirable factors or conditions which
location of said plunger in relation to the dis
10 charge valve. This air collection in the top space
extension from the discharge passage 3 (or 3B).
'I'his tube may be secured and rigidiiied by passing 10
. thereby setting up a counter force or 'action that
15 seriously aii'e'cts and destroys the pump effec
tiveness. It has presented a problem of practical
ment has the advantage of putting the gauge up
lwhere itÍ will be readily visible for reading, and 15
the air chamber will be free from any tap holes
of the pumping chamber is objectionable, because through a lug I9 provided on the upper end of
saidv air compresses on' the discharge stroke and the air chamber and is fitted with a pressure
expands on the suction stroke of the plunger, ' gauge 20 onv its own upper end. This arrange
operation which the present invention is intended
to remove and which it does remove by a very
simple expedient.
20
From the upper space 8* around the plunger
an auxiliary passage I3 connects with the air
chamber I4, usual to pumps of this type, which
latter is in lateral open connection at its bottom
with the main discharge passage 3 as by an ex
which might be the cause of air leaks should
the gauge be fitted in the top of the air chamber
as is usually done.
«
'
Fromv the foregoing it will be readily appre
ciated that the structure and organization de
scribed serves two purposes. Firstly, it keeps the
pump free from air. Secondly, it keeps the air
chamber charged with air to form and maintain
tension or joint piece 3‘ thereof. Said auxiliary
an effective cushion, and incidentally it serves the
third purpose of guarding this cushion of air
against any possible escape. The air which is
pumping and air chambers, the check-valve being '.unavoidably drawn into the pump through the
arranged after the cock or nearest to» the air suction line is forcefully and eifectually expelled
passage is provided with a check-valve I5 therein,
and also with a relief cock I6 intermediate the
30 chamber.
Associated with said cock is another
check-valve I‘I advantageously formed in unit
assembly therewith. The purpose of these two
check-valves and the cock will be made present
ly to appear. The aforementioned valve 5 con
trolling the main and normal discharge passage
is made to offer enough resistance to the pumped
through the auxiliary# passage either by carriage
with 4some of the water or by the pressure action
of the water body thereon under action of the
plunger. This air is discharged into the air
chamber without/ possibility of reentering or back
pressing into the pumping chamber and serves to
continually supply the air cushion desired and
liquid to cause some of the same to pass through
necessary to maintain in the air chamber so as
the auxiliary passage I3 with operation of the
pump, thereby carrying away from the top of the
to make up for the air loss therein from_ ab
40. pumping chamber any air that may collect or tend
to accumulate therein and discharge such air into
the air chamber. Said air chamber is of' a size'
to assure that the iiowof liquid thereinto is so
low that the air and water will separate, the air
45 going up to form an effective cushion, and the
water passing on into or through the main dis
charge 3.
It will be understood that any dis~
charge taking place through the auxiliary pas
sage I3 will have the same result and produce the
50 same effect regardless of its cause, that is, whether
it is caused by the resistance of the valve 5 or
sorption by the liquid fiowing through the normal
discharge. 'I'he practicability of this means of 40
eliminating the interference of such air with the
pump action and the improved result obtained Y
therefrom will be realized and readily appreciated
by anyone versed in this art and acquainted
with the diihculties met in actual vutility of such 45
pumps.
Another problem encountered in the use of.
pumps of this type wherein the water end is below
the motive mechanism is the retention and cir
culation of lubricant to properly and adequately
lubricate the moving parts. This has presented 50
by the presence of air in the pumping chamber. another problem of practical operation which the
When first starting up the pump, and there be
present invention is intended to remove and which
ing pressure in the discharge line, the cock I8 , it does remove by a very simple improvement
55 is opened toallow the air to discharge to the 1 in the structure and organization of the pump.
55
atmosphere so that it cannot be compressed
The pumping plunger l'is connected not with
upon the discharge stroke of the plunger _and ex
a crank arm direct, as ordinarily, but indirectly
pand again on the suction stroke thereof. In
stead, the ‘liquid being pumped will be drawn through a guide or extension member 2I co-axial
through the intake valve 4, and such air or gas as therewith. Said connection is effected in this in
stance by a bolt 22 extending through the plunger
is drawn- along with it will be subsequently ex
pelled in the same way. 'I'he check-valve I‘I as
sociated with said cock prevents air being drawn
in on the suction stroke of the plunger and this
65 cock is vkept open until the air or gas has all been
discharged and the pump has picked up the more
solid liquid for continued pumping. Thereafter
the cock may be closed and any air entering the
pump in its succeeding normal’operation, either
70 by lndraft or presence in the water through leak
age or otherwise, will be constantly carried and
passed off through the auxiliary passage I3 to
discharge into the air chamber Il. The check
valve I5, of course, serves to prevent any back
75 now. Thus the air chamber I4 is kept supplied
and having a threaded upper end engaging in
said member 2| and a threaded lower e`nd en
gaged by a retaining nut 23 holding it clamped
tightly into place. Incidentally, this affords an
easy means of removal or replacement through
the hand hole opening in the bottom of the pump
casing closedA by the plug-capl 9, which is made
largel enough to permit the plunger to be drawn
therethrough. 'I‘he needlof removing, looseningv
or disturbing other parts of the pump is thus 70
eliminated, which is a very desirable advantage.
The said guide member. 2I is pivotally connecten
at 24 with a crank arm 25, which in turn is
conventionally connected with a crank shaft 26 75
' 2,118,284
or other means of translating rotary into re
ciprocatory motion.
-
y
Said’crank shaft. crank arm and guide mem
ber are enclosed by Aan inverted crank case 21 in
which the crank shaftjs journalled and which is
itself mounted on the pump casing below. Its
lower end is, of course, Walled or closed over ex
1 cept for an opening for said guide member there
through. This opening is fitted with a stuilìng
10 box 28 surrounding the guide member so as to
allow it to move up and down freely, but effectu
ally seal the opening against .oil leakage. The
lower portion of _the crank case, constituting the
connection. with the latter for such purpose.
The gear 31 is thereby caused to rotate in a pool
of the oil. With rotation it will, of course, pick
up some of the oil between its teeth, and by cen
trifugal action will throw the picked up oil out
.ward against the inner periphery of the gear
case. -Such of the oil as is thrown against the
l back wall of the case drains to a trough 38', indi
cated in dotted lines, and this trough inclines
downwardly to an opening 39 back into the crank 10
case above the level of the aforesaid overflow
opening 34. Thus the gear case is adapted and
_utilized to` serve as a lubricant supply reservoir
sump chamber or area thereof, is formed as a
keeping the oil in the crank case to a level such
cylinder 218l in which the aforementioned guide i as to overflow continuously into the gear case
member 2| moves. Fitting into this cylinder, the
stood that in the-filling process, some of the oil
enlargement of the same, guided by the cylinder
member and fill or partially fill the cylinder space
therebelow so that the crank case is substantially 20
ñlled from the bottom to the upper- level of its
overflow hole and none of the oil pumped out of
the cylinder space by the piston member is actu
20 walls. ‘ Enough clearance is allowed between said
piston portion and the surrounding cylinder to
permit oil to work or pass therearound into the
space below, which accordingly becomes filled,
the bottom face of the piston portion being
formed with a peripheral lip or downwardly ex
tending edge 29 serving as a drip. Said guide
member’s aforesaid pivotal connection 24 with
the crank arm is very expediently effected- within
this piston portion in the manner of the ordinary
30 crank arm and piston connection.
Extending upwardly from the bottom of the
cylinder and aforesaid sump chamber of the cas
ing is a side passage or channel 30, having its
upper end 30“ opening and directed toward the
35 crank shaft and its throw. This passage has a
one-way check or flap valve 3i therein serving
to prevent any of the discharge therethrough
from flowing back into the cylinder or sump
space.
-
45
55
60
through the aforesaid hole 32. It will be under
guide member has a piston portion 2|. von the
upper end thereof, formed in this instance as an
A similar passage 32 on the opposite side
will flow down past the piston portion of the guide
ally lost to reduce the working level below that
of said overñow hole.
25
_ In operation, the oil placed in the crank case
seeps down along or past the piston portion 2W
of the guide member as before stated, the clear
ance between said portion and the cylinder wall
in effect providing a passage between the upper 30
and lower sections of the crank case. The
amount of oil which will thus seep down aroundl
said' piston portion can be controlled by the close
ness of its ñt to the cylinder so as to provide
for the space below the piston portion to be con 35
tinuously ñlled or only partially filled during the
guide member’s stroke action. The oil below said
piston portion is forced out and upwardly
through the pasasge 30 as the member descends,
of the crank case extends upwardly from the cyl , so as to stream said lubricant onto the crank shaft
inder from a level somewhat above that of the and connected members as previously described.
first-named passage, and has its upper end 32a
This action on the oil is promoted yif the space
opening into the crank case above the corre
below the piston portion is only partially filled
sponding opening of the first passage. Oil which with oil, so that air is drawn freely thereinto
has entered the cylinder space below the piston down through the passage 32. Air so taken in
portion of the guide member is thereby forced will become trapptd between the piston portion
upwardly through the first-named passage 30 and the oil level as the piston portion closes over
upon downward movement of the member, so the lower end of said passage 32, and being then
as to discharge a stream of the lubricant onto compressed will act with a strong blowing action
the crank shaft, its throw and connecting rod upon the oil therebelow so as to drive it with
bearing. From these parts the oil, of course, considerable force up the passage 30. Converse
drips down onto the top of the piston portion 1y, on the upward stroke of the guide member a
within the upper section of the crank case. -partial vacuum will be created in the cylinder
Through the second-named passage 32, air from below the piston portion, tending to draw a fresh
the top portion of the crank case will be supplied supply of air down through the passage 32 and at
to the cylinder space below the piston portion the same time to also draw more oil from the
of the guide member so as to be drawn thereinto upper section of the crank case down into the
as said member works up and down. The air so cylinder so as to provide a fresh quantity or
drawn into said cylinder space will be -trapped charge to be blown over the crank shaft as be
between the lower ends of the passages as the fore. This action» repeats continuously as the
>guide member travels downward and this trapped guide member is moved up and down by the crank
air being thus compressed by the piston part of
the member>will literally blow the oil thereunder
through the first-named passage so as to main
85 tain a continuous jet of lubricant discharge onto
the working parts above.
Thus a continual cir
culation of lubricant is assured automatically by
the operation of the pump.
Oil is supplied to the crank case through an
70 opening in its top normally closed by a plug 33.
It is filled to the level of an overflow hole 34 in
one side. This overflow hole empties into the
gear case 35, and fllls also the latter to a pre
. determined proper level which will be advan
75 tageously indicated by a gauge 36 provided in
shaft.
40
45
-
50
55
60
’
As the oil is thus, in operation, continuously
drawn from the upper into the lower section of thecrank case and expelled back vagain thereinto, 65
thereby tending to keep the oil level uniform _in
the upper section, some of it simultaneously
overflows through the opening 34 into the gear
case 35. 'I‘here it is picked up by the rotating
gear and carried around to drop into the trough 70
38 and thereby feed back again into the crank
case, thus effectually maintaining a lubricant
supply reservoir to the crank case and assuring
that its level remains substantially constant. A
continuous circulation of the lubricant is accord 75
4
2,118,234
ingly maintained upon al1 of the parts, so as to
_ *I
,
Having thus described my invention, what I
keep them thoroughly andadequately lubricated,
claim as new and desire to secure by Letters Pat
the crank shaft, crank throw and bearing being
supplied by the discharge jet through the pas
sage 30, the driving gear being supplied by its ro
entiof the UnitedStates is:
tation in a generous oil bath, and the crank arm
controlled admission passage and a valve-con
trolled discharge passa e, a reciprocating plunger
operable in said pùmpin chamber, an air cham
ber connected with said discharge passage, an
pivot and piston portion of the guide member be
ing constantiy'submerged in oil. Tl‘le flow cycle
or circulation of the oil is, of course, continuous
during operation of the pump and all of thework
ing parts .are very thoroughly and generously
supplied with the lubricant. It is necessary
merely to be sure that the crank case is initially
filled to the proper level as will be indicated by
the gauge 36 in connection with the gear case.V
It will be noticed that the stumng-box 28 _of the
l'illustrative construction is so constructed that
it will not be required to stop oil' any of the oil,
or any more thereof than is splashed or -adheres
onto the guide member which extends there
through into connection with the pumping plung
'
1. A reciprocating liquid pump, comprising in
combination, a pumping chamber having a valve
auxiliary discharge passage connected between
the pumping and said air chambers from the
region of the former wherein the plunger limit of
retraction is situate, and means in said auxili
ary passage for controlling the discharge there
through alternatively into the air chamber or
direct to thevatmosphere.
l
l2. A reciprocating liquid pump, comprising in
combination, a plunger cylinder and a pumping
space into which the cylinder opens downwardly,
. a plunger vertically reciprocable in said cylinder, 20
that are required to lubricate pumps >of this na
a valve-controlled liquid inlet‘ to said pumping .'
space, a valve-controlled liquid discharge from
said pumping space, an air chamber com
municating with said liquid discharge, an aux
iliary valve-controlled discharge passage between
ture, which tend to stick to the‘member passing
therethrough and pass with it through‘the boxl
from the upper region of the former adjacent to ~
er.
The reason for not subjecting the stuff
ing-box to the necessity of stopping the oil is due
to the high viscous qualities of most lubricants
said pumping space and _air chamber extending
so that some of it will be wiped off by the packing said plunger, and means for reciprocating the
on the up stroke and consequentlywasted. On l plunger Áfrom a. position thereabove.
3. In~ a reciprocating pump, comprising a
the other hand, if the packing is drawn. up tight
plunger, a pumping chamber into which the
enough to wipe oil.' the heavy lubricant, an un
necessary friction is set up, thereby wearing the plunger is operatively projected, a valved inlet
packing excessively and consuming more of the passage to and a valved main discharge passage
power of the pump. It is, of course, necessary to from the pumping chamber, a secondary passage
employ a stuiling-box strong enough to with
stand the oil pressure from the descending piston
portion of the guidel member, but it. should not
be required to stop oil' any of the oil if the best
separately connected between the pumping cham
ber and the main discharge line therefrom behindand above the valve in said line for discharging
from said pumping chamber the lighter liquids or
results and highest eñìciency of the pump are to
be obtained. It is suiiicient for it merely to pre
vent the loss or wastage of oil through the pack
gases that the pump may be pumping.
4. Ina reciprocating pump, including a plung 40
er, a pumping chamber into which the plunger
operatively extends, a valved inlet passage to the
chamber and a- `valved main discharge passage
from said chamber, a secondary independent pas
mg.
_
'I'he carriage or other base upon which the en
tire pump unit is mounted has not been shown,
but it will be understood, of course, that it is in
tended to'be placed on any suitable mount, either
for portage or fixed operation, this constituting
no particular part and being of no importance to
the invention itself.
A greatly improved pump construction is thus
provided. Not only is the major efficiency of this
type of pump attained and assured by the pro
vision for eliminating the collection or presence
of air in the upper part of the pumping cham
ber which deleteriously affects the pump opera
tion, but it also attains and assures a thorough
lubrication of all the working parts by the pro
vision for a complete and generous lubricant
» circulation without the necessity of any attend
ance. The invention accordingly produces a
novel working organization and makes a distinct
advance in the art.
It will be understood that this invention may
. be embodied in any number o1' different forms
sage separately connecting from said chamber to 45
the main discharge line upon a level above the
main discharge passage and at a point behind '
the valve in said passage for discharging from
the chamber the lighter liquids or gases otherwise
accumulating therein.
50
5. In a reciprocating pump, including a plung- i
er, a pumping chamber into which the plunger
operatively projects, a valved inlet passage to
the chamber and a valved main discharge pas
sage from said chamber, a secondary independent 55
passage connected separately from the pumping
chamber to the main discharge line Ybehind and
at a level above the valve in said line for dis
charging from ‘said chamber the lighter liquids
or gases drawn thereinto, the said secondary 60
passage extending from that section lof said
chamber wherein air or gases would otherwise
tend to accumulate so as to render the pump
“air bound”.
`
'
6. In a reciprocating pump, comprising a
distinguishing from that here illustrated and
described, and that various combinations and pumping plunger and a pumping chamber into
sub-combinations and changes in the form and which the plunger is operatively projected, the
arrangement of the parts can be made to suit latter having a valved inlet passage and a valved
different types and organizations of pumps of main discharge passage, a secondary discharge
passage from said chamber discharging into the 70
70 this same general character, without going be
main discharge line behind -and above the valve
yond the actual scope and spirit of this inven
in said line, said secondary passage serving for
tion. Therefore, the appended claims are not in
the discharge therethrough of the lighter liquids
tended to limit the invention to the speciiic con
or gases drawn into the pumping chamber and
struction, arrangement, organization or combina
.having
therein means for permitting such dis 75
tion
illustrated
and
hereinbefore
described.
Il
amaca-i
charge to occur either into the main line or di
rect to the atmosphere. '
'
7. In a reciprocating pu’mp, comprising a
pumping plunger and a p ping chamber, the
latter'having an inlet passa e thereto and a dis
charge passage therefrom, a secondary discharge
passage from said chamber discharging into the
main discharge line through a reduced pressure
area, said secondary passage serving for the dis
10 charge from said chamber of the lighter liquids
5
or alternatively to the atmosphere.
`
l1. In a reciprocating pump, including a plung
er, a pumping chamber having a main inlet pas
sage and a main discharge passage, together with
an air chamber communicating with'said dis
charge passage, a secondary discharge passage
connected between said pumping and air cham
or gases drawn thereinto and having means -forj
bers so as to discharge from the former to the
.allowing such discharge ‘either directly into said
latter, said secondary discharge passage having
reduced pressure area or to the atmosphere.
8. In a reciprocating pump, comprising a
pumping plunger, a- pumping chamber having an
means therein for discharging directly into the
air chamber or alternatively to the atmosphere,
and means of preventing a discharge-from the air
inlet passage thereto and a main outlet passage
chamber to the atmosphere.
therefrom, together with an air chamber con
nected with said outlet passage, a secondary dis
charge passage connected between said pumping
20 and air chambers for discharging from the
former the lighter liquids or~gases drawn by suc
tion thereinto, and means inN said secondary pas
sage for directing the discharge therethrough
into said air chamber.
25
_
discharge from the former to the latter, said
secondary discharge passage having means there
in for discharging directly into the air chamber
'
9. In a reciprocating pump, including a plung-
er, a pumping chamber having an inlet passage
and a main discharge passage, _and an air cham
ber connected with'said discharge passage, a sec
ondary discharge passage connected directp be'
region of the former adjacent to the plunger, the
said secondary passage containing means con
trolling its separate discharge into the air cham
ber and means vof preventing a reverse ñ'ow of
‘
.
-
‘
plunger, a pumping chamber having an inlet
passage thereto and a main discharge passage
therefrom, together with an air chamber con 20
nected with said discharge passage, means sepa
rate'irom and independent of the main discharge
pesage for discharging directly from the’pump
ing chamber tó said air chamber any air or gas
, entering into the former from the pumping
25
action.
'
~
13. A reciprocating liquid pump, comprising in
combination, a pumping chamber having a valve-v
controlled inlet passage ~and a valve-controlled
30 tween said pumping and air chambers from a
the discharge therethrough.
'
12. In a reciprocating pump, comprising a '
Y
l0. A reciprocating pump, comprising a plung
er, a pumping chamber having a main inlet pas
jadjacent to the plunger, and means in said auxi
sage and a main discharge passage, an air cham
iliary or secondary passage for controlling the
discharge therethrough either direct to the air
ber connecting with said discharge passage, and
chamber or to the atmosphere.
,
'
a secondary ’discharge passage connected be
tween said pumping and air chambers so as to
1
outlet passage, a reciprocating plunger operable 30
in said pumping chamber from above, an air
chamber connected with said discharge passage,
an auxiliary or secondary discharge passage con
nected between the pumping chamber and said.
air chamber from 'the upper region of the former 36
40
HERBERT E. RUPP.
.
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