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Патент USA US2405734

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H. s. COE ’
PUMPING APPARATUS
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Har/'won .i Coe
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ATTORNEY
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H. s. COE
,405,73
PUMPING APPARATUS
Filed Aug. 19, 1944
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Patented Aug. 13, 1946
UNITED
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STATES
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PATENT . OFFICE
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PUMPING APPARATUS
Harrison S. Coe, Palo Alto, Calif.
Application August 19, 1944, Serial vNo. :550,240
14 Claims.
1
This invention relates to a pumping apparatus
of the type in which an impelling liquid body
which is actuated by a piston in a cylinder acts
against a diaphragm, causing_it to pulsate in
alternate suction and pressure strokes and there
by to admit and expel the liquid being pumped
from a pumping compartment formed at least
(ci. 10s-_44)
`
'
2
to provide means to prevent air from accumulat
ing in the impelling liquid compartment and to
replace liquid escaping therefrom.
It is a further object of the present invention
to provide means to introduce liquid into the
impelling liquid compartmentl and to expel liquid
in part by said diaphragm. The diaphragm in
therefrom ’and thereby .remove heat generated
therein.
this type of pump serves principally to separate
_ Other objects and advantages will appear from
the liquid being pumped from the impelling liquid 10 the following specification and drawings .in
and prevent the former from contacting the
piston and cylinder and cause undue wear or
which:
Figure 1 is a side view, in cross-section, of a
corrosion where abrasive or corrosive iluids arev
diaphragm'vpump incorporating the preferred
To obtain eñicient operation in a pinnp of this
embodiment of my invention.
Figure 2 is a cross-sectional detail taken along
being pumped.
type, the .diaphragm must pulsate freely, or with
out undue strain, in its expansion and contrac
tion .of the pumping compartment. Since, for
like .positions of the piston in the cylinder, the
the line 2-2 of Figure 1.
~
Figure 3 is a cross-sectional'view taken along
the line 3-'3 of Figure v1`.
Figure 4 is a modification of the invention
degree of expansion or contraction 'of the pump 20 illustrated in Figure 1 'in which a diiïerent type
ing compartment depends entirely upon the vol
of diaphragm is used.
ume of impelling liquid in the pump, it will be
As shown in Figure 1 there is provided Va cham
obvious that the free movement of the `dia
ber lIU of oblong oval form, which is provided
phragm, throughout a stroke of the piston, can
with annular flanges l! and I2 at its upper and
only be lmaintained if the impelling liquid re 25. lower ends. Mounted above chamber Iû is a suit
mains constant within narrow limits.
able outlet valve body I3 which is secured ‘thereto
While this class of pump has marked advan
by suitable bolts 'through cooperating flanges I2
tages over ordinary piston pumps where abrasive
and Ill. An airtight and liquid-proof seal b'e
or corrosive liquids are to be handled and is used
tween these members is obtained by the use of
under some especially severe` conditions i-n the
a' suitable gasket I 5. Mounted within valve body
pumping of mud in drilling of oil wells and like
rI3 I have provided a poppet type valve I6 adapted
services, its application, up to the present, has
to move longitudinally and to Vbe operated by
been very restricted, because of leakage of fluid
differential pressure thereon. Valve I6 is >nor
past the piston that actuates the impelling liquid.
mally maintained in the position shown in vFig
This leakage is never completely avoidable and 35 ure 1 b-y gravity. When the pressure in body I3
has kmade it necessary to stop the pump ai', inter
below valve I6 sufliciently exceeds the pressure
vals, dependent upon the rate of leakage, and
in the larea above the valve, the same is opened.
adjust the volume of impelling liquid and dis
When .the pressure in body vI3 below valve I6 is
place any accumulated air in the impelling liquid
less vthan the pressure in the area above the valve,
compartment. Another factor tending to limit 40 the same maintains the position shown in Fig
the application of the type of pump under con
' ure 1. vValve‘lbody I3 extends downwardly into
sideration has been the deleterious effect on the
chamber I0 forming a cylindrical projection Il,
apparatus and its operation produced by the
the use of which will hereafter .be explained.
overheating of the impelling liquid due to its
Secured to the lower end of chamber Il@ and
friction in the pump.
projecting inwardly thereto I have provided a
Another factor which has heretofore presented ' cylindrical member I8 provided with orifice I9.
difficulty in this type of pump arises from the
Also secured to the lower end of chamber IU by
tendency of solids and air, separating from the
suitable bolts and gaskets, is a valve body 20 and
material rbeing pumped, to accumulate in parts
its cooperating poppet valve 2I of the same type
of the pumping compartment .and interfere with 50 as vvalve I6 and likewise operated .by differential
eñicient operation.
~
It is an object of the present invention to pro
- pressures within body 26.
The entire device is '
suitably connected .to a source of material to be
vide means to maintain the diaphragm in posi
pumped as "by means of flange 22.
tion to pulsate freely .and without strain.
Within chamber -I0 I have provided a -dia
It is a further object of the present invention 55 phragm .or tube 30 made .of ilexiblematerial such
2,405,734
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as natural or synthetic rubber, which is secured
at its ends to members I1 and I8 respectively by
any suitable means to provide a liquid-proof seal.
As shown in Figure 1, diaphragm 30 may be se
cured to members I1 and I8 by clamps 3|. Ex
tending downwardly from member I1 within tube
3l), I have provided an annular guard tube 32 to
prevent the collapse of tube 30 into valve body I3.
Chamber Ill is provided with a cylindrical >out
let 4Il'which is in communication with cylinder
4I. Within cylinder 4| there is a reciprocating
piston or plunger (not shown) adapted to re
ciprocate longitudinally therein as indicated by
the arrow. On that portion of diaphragm 30 op
posite oriñce 40 I have provided a metal plate 42
which is adapted to act as a shield against the
direct impact on diaphragm 3D cf'liquid entering
chamber I0 through orifice 40 during the pressure
stroke of the piston and to prevent diaphragm 30
from being drawn unduly toward or into oriñce
40 during the suction stroke of the piston. Dia
phragm 30 is preferably iluted as shown in Figure
3 in order that the same may be expanded and
contracted with the minimum of “stretching”
As will hereinafter more fully be explained the
space within chamber l0 and outside of dia
phragm 30 is termed an impelling liquid compart
ment, and the same is ñlled with liquid herein
after called impelling liquid.
of the piston within cylinder
impelling liquid is alternately
of the cylinder 4I thereby
4
means of circular orifice or passage 62. Valve
means 60 is suitably secured to chamber III to in
sure a liquid and air-proof seal therewith. Co
axially mounted within housing 6I I have pro
vided a cylindrical member 63. Extending into
the impelling liquid compartment through orifice
62 I have provided a push rod 64 adapted to op
erate valve member 65, which cooperates with
valve seat 66. Valve 65 is mounted adjacent one
side of a piston 61 which is slidably mounted
within cylindrical member 63. Valve 65 is
Aadapted to close against seat E6, and when in
engagement therewith prevents communication
between housing 6I and chamber Iû. In order to
maintain push rod 64 accurately aligned within
orifice 62 to prevent jamming of the same, I have
provided an axially aligneddnember 1I) adapted
to cooperate with a cylindrical extension 1| upon
piston 51. , Spring 12 is >adapted to urge piston
61 and valve 65 into closed position, that is,
against valve seat 65. The interior of cylinder
63 is in communication with the space surround
ing cylinder 63 by restricted orifice l13 in piston
61 and by oriñces 14 and 15 in cylindrical mem
ber 63. Orifices 14 are provided with closure
members 16 of the “pinched tube” type which
permit expulsion of liquid 4from Within the cylin
der 63 through orifices 14 but do not permit re
turn of liquid into said cylinder through said
Upon reciprocatìon
4I a portion of the 30 orifices. Orifices 13 and 15 are simple openings
permitting inñow and outflow therethrough. It
drawn into and out
is obvious therefore that liquid may be expelled
creating alternate
suction and pressure pulsations within chamber
I0. Alternate suction and pressure within cham
ber I0 expands and contracts the area within
diaphragm 30, known vas the pumping or im
pelled liquid compartment thereby increasing or
decreasing the pressure and volume within the
from within cylinder 63 much more rapidly` than
it may enter. Oriñces 68 are provided in cylin
drical extension 1I to permit the entry of liquid
therein and prevent creation of a vacuum. Hous
ing 6I is also in communication with a source
of liquid supply 5I through passage 11 and check
valve 18. Check valve 1S permits the fiow of
same. As will be obvious to those skilled in the
art, compression of tubular diaphragm 30 causes 40 liquid from chamber 5I into housing 6I through
the impelled liquid ,therein to be forced through
conduit I3'past'valve I8. Expansion of tubular
diaphragm 30 creates differential pressure within
the same and draws liquid into the same through .
valve 2|.
As has previously been pointed out, on suction
strokes of the piston within cylinder 4I a small
amount of air may be drawn into the impelling
' liquid compartment and ultimately this air seeks
passage 11 but prevents the expulsion of liquid
from housing 6I through passage 11 into liquid
chamber 5 I.
'
.
Operation of the device and method may vbriefly
be described as follows: A quantity of `impelling
liquid is placed in the pump suñîcient to establish
pumping operation. The pump is attached to a
source of material to be pumped by suitable con
nection to ñange 22 on valve body 28. A quan
the highest point therein. To provide an escape 50 tity of impelling liquid is placed in liquid supply
chamber 5I, and valve A52 is opened. Reciproca
for this air I have provided an oriñce 45 con
tion of the piston within cylinder 4I as has pre
nected by suitable piping 46 to a resistance means
viously been explained, draws a portion of the
41 vconsisting of cylinder 48 within which I have
impelling liquid within the impelling liquid com
mounted a screw member 49.' Passage of liquid
through orifice 45 is retarded thereby. Ball-_ 55 partment into cylinder 4I causing expansion of
tubular diaphragm 30 creating a differential
check valve 50 >within liquid holding chamber 5I
pressure therein and drawing liquid into the
prevents the sucking of liquid into the impelling
pumping compartment through valve 2I. A
liquid compartment on the suction stroke. A
pressure stroke of the impelling ñuid contracts
suitable valve 52 is provided in the event it is
found desirable to adjust or close the escape sys 60 diaphragm 3i] and expels liquid from the pump
ing compartment outwardly through valve I6.
tem. As will be pointed out hereinafter, at times
Air entering the impelling liquid compartment
it may be desirable to vent a portion of the im
would be trapped in chamber II! at its highest
peiling liquid from chamber I0, and in that event
point and would cause the difñculties previously
bañie41 and check valve 50 would operate in the
same manner as with the escape 0f air. I con 65 enumerated. Air would tend to be` expelled upon
a pressure stroke through orifice 45 and resist
template that liquid chamber 5I may at times
ance
means 41 into liquid chamber 5I. As a
function as a heat exchange unit to supply cool
liquid to the impelling liquid compartment.
To permit the introduction of liquid into the
matter of fact, under some conditions, air and
liquid or liquid would be expelled through orifice
impelling liquid compartment surrounding dia 70 46 to liquid chamber 5I. The flow through or
iñce 45 may be controlled by resistance 41 and
phragm 30, I have provided a novel valve means
designated generally at 60. Valvermeans 6I! con
siste generally of a cylindrical housing or inter
valve 52 as desired.
In the event liquid within the impelling liquid
compartment escapesl through orifice 45 or
mediate compartment BI which is in communica
tion with the impelling liquidcompartment by 75 around the piston within cylinder 4I', it is ob
5
2,405,734“
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vious-thattubular `diaphragm 36 will expand and
-will strike -push rod 6d and urge valve 65 Vaway
88 is slightly different in the modification shown
in Figure .2i than as shown in Figure 1. Upward
movement of diaphragm t1 upon a suction stroke
causes diaphragm ‘8l to strike push rod 90 and
from its seat 66, -thereby permitting communi
cation between housing El , and chamber l0,
through oriñce 62. When valve E5 is forced
away from its seat yESS, piston 61 is moved into
raise valve 9| from itsseat 92 thereby permit
ting communication between impelling iluid com
cylinder .63, forcing liquid outwardly -therefrom
partment 82 and valve chamber 93. Y Upward
through oriiices 13 and M. When, upon the fol
movement of valve 9! causes expulsion ci liquid
lowing pressure stroke, tubular diaphragm 3Q is
above double piston arrangement 94 through the
contracted, it is no ~longer in contact with push 1k rubber nipples `95 as previously explained in con
rod 64, and spring 'l2 urges valve E5 toward closed
nection with the operation of valve means '60.
position. Valve `65 is prevented from closing
in Figure 1. However the return of valve SI to
rapidly by virtue vof the fact that the sole route
its closed position issolely by gravity.l Rein
by which liquid can reenter cylinder 63 is through
troduction of liquid into the area above the dual>
metering orifice 'F3 in piston Si' and oriiices 15.
piston arrangement 94 is through orifices 96
Ori?ices 'l5 will be closed by piston Sl until valve
therein. The dual piston arrangement is to in
65 isfnearly closed. When piston S'Iwopens ori
sure perfect alignment of push rod @il in. the
fices 15, they will permit a substantial increase
orifice it@ in chamber 93. When impelling :fluid
in the flow of liquid into cylinder t3 and allow
compartment 82 and chamber '93 are in com-l
spring 12 to accelerate the closure of valve S5. 20 munication, expulsion of liquid therefrom upon
However, flow of liquid Írcm'the impelling liquid
the pressure stroke is prevented by the operation
compartment into housing »6l through orifice 62
of ball-check valve IUI. However under condi
upon the pressure stroke is prevented by check
tions of suction, introduction of liquid from
valve T8. Therefore upon a pressure stroke no
liquid chamber 88 into liquid chamber 812 through
liquid or pressure in chamber iii is lost Áby virtue
of the opening of valve 65. However upon the
.\ valve 9i is permitted.
The cycle of operation and introduction of
start of the following suctionstroke, liquid is
liquid into the impelling liquid compartment .is
drawn from liquid chamber 5| through conduit
the same as has been previously explained in
'Il into housing 6i and from there, through
connection with Figure l.
oriñce A62, into the impelling liquid compartment n
I claim:
within-chamber l0.
l. In a pump having a chamber and a dia
If liquid drawn in during the period when
phragm within said chamber and dividing the
valve 65 is open balances the liquid being lost
same into an impelling liquid compartment and
from the impelling liquid compartment, the oper
a pumping compartment, inlet and outlet valves
ation is in equilibrium and the position of the di..
permitting the inflow and outñow of liquid from
aphragm at the end of the succeeding suction
said pumping compartment upon movement of`
stroke remains Stabilized. If Valve 55 closes too
said diaphragm, a liquid holding chamber, valve
quickly to admit liquid to balance this loss the
means adapted to function in response to the ac
diaphragm 3i] expands and increases the range
tion of the diaphragm to allow 0r prevent com
of movement of piston 67 thereby causing the
munication between said impelling liquid com
period during which valve `65 remains open to
partment and said liquid holding chamber, said
be extended and in turn causing more liquid to
be drawn in through valve 18. This progressive
valve means including means adapted to retard
the closure of the valve through an interval of
time dependent in duration on the volume of liq
expansion of diaphragm 30 will cease when the
liquid drawn in balances »the liquid loss. In rare
cases liquid may enter through valve ’I8 during
the period when valve 61 is open as diaphragm
30 approaches the end of the suction stroke.
Under most conditions pressure exists in the im
pelling liquid compartment during this period
and all passage of liquid through oriñce 52 will
occur following the succeeding pressure stroke.
In the modiñcation of my invention illustrated
in Figure 4, the tubular diaphragm 39 of Figure
1 is replaced Iby a simple ñexible sheet-like dia
phragm 8l. Impelling liquid compartment 82 is
suitably connected to a reciprocating piston ar
rangement, not shown, by conduit 83. Opera
tion of the impelling liquid within compartment
82 operates diaphragm 8l in much the same
manner as the operation of diaphragm St as
has heretofore been explained. Pulsation of di
aphragm 8l creates alternate pressure and suc
tion within impelled liquid or pumping compart
ment 84 thereby causing the entry of material
through poppet valve 85 upon a suction stroke
and expulsion of material through poppet valve
86 upon a pressure stroke.
Escape .of air or
liquid through orifice 6l and into liquid chamber
4.3
uid in the impelling liquid compartment.
2. In a diaphragm pump wherein the dia
phragm is adapted t0 move in response to the ac
tion of impelling liquid in contact therewith, a
chamber adapted to act as a source of impelling
liquid but spaced from the impelling liquid in con
tact with said diaphragm, a valve responsive to
the position of said diaphragm to permit or pre
ventV communication between said chamber and
said impelling liquid in contact with said dia
phragm, and means adapted to retard the closure
of said valve through an interval of time depend
ent upon the position of the diaphragm at the
conclusion of its suction stroke.
f
3. In a diaphragm pump wherein a diaphragm
dividing an enclosed space into a pumping com
partment and an impelling liquid compartment
is adapted to move in response to the action of
impelling liquid in said impelling liquid compart
ment; a chamber adapted to act as a source ofY
impelling liquid and spaced from the impelling
liquid compartment, valve means responsive to
the position of said diaphragm and adapted to
open and close a passage between said chamber
and said impelling liquid compartment, and
88 is identical to the escape of the same through
70 means adapted to retard the closure of said pas
oriiice 45 as pointed out .in connection with
sage through an interval of time dependent on
Figure l.
However the device permitting the introduc
tion of compensating liquid to the impelling
liquid 'in compartment 82 from liquid chamber
the position of the diaphragm at the conclusion
of its suction stroke.
'
4. 1n a diaphragm pump wherein a diaphragm
dividing >an `enclosed space into a pumping com-->
2,405,734
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partment and an impelling liquid compartment is
adapted to move in response to the action of im- '
pelling liquid in said impelling liquid-compari',->
ment; a chamber adapted to act as an interme
diate source of impelling liquid, a passage leading
from said chamber to an exterior source of-sup
adapted to move in response to the action of the
impelling liquid in said impelling liquid compart
ment, a chamber adapted to act as intermediate
source of impelling liquid, apassage leading from
said chamber to an exterior source of supply of
impelling liquid, a valve adapted to close said
passage under the influence of pressure in said
ply of impelling liquid, a valve adapted to close
chamber and to open it under the influence of
said passage under the iniluence of pressure'in
suction
therein, a second passage communicating
said chamber and to open said passage under the
influence of suction therein, a passage communi 10 said chamber with said impelling liquid compart
ment, valve means responsive to the position of
cating said chamber with said impelling liquid
said diaphragm andA adapted to open and close
compartment, and means responsive to the po
said second passage comprising a compartment of
sition of said diaphragm adapted to open and close
variable space, a member adapted to contract
said passage.
5. In a diaphragm pump wherein a diaphragm 15 said space in response to an action of the dia
phragm, means adapted to exert a force against
dividing an enclosed space into a pumping com
partment and an impelling liquid compartment is , said member tending to expand said space, a valve
adapted'to maintain a controlled position in rela
adapted to move in response to the action of im
tion to the position of said member and to open
pelling liquid in said impelling liquid compart
ment, a chamber adapted to act as an interme 20 said passage on the contraction of said space and
to close it on the expansion, of said space, and
diate source of impelling liquid, a passage lead
means adapted to control the rate of expansion of ing from said chamber to an exterior source of
said space.
,
supply of impelling liquid, a valve adapted to close
9. A diaphragm pump embracing an enclosed
said passage under the influence of pressure in
space divided by a diaphragm into a pumping
said chamber and to open it'under the influence 25 compartment and an impelling liquid compart
of suction therein, a passage communicating said
ment, an intermediate compartment separatingY
.chamber with said impelling liquid compartment,
the impelling Yliquid compartment from a source
valve means responsive to the position of said
of liquid supply, a passage leading from said
diaphragm and adapted to open and close said
source into said intermediate compartment, a
passage, said valve means including a cylinder en 30
valve in said passage adapted to admit liquid into
closed at one end, a piston in said cylinder, means
and to close against the flow of liquid out of said
adapted to cause a movement of said piston in
compartment, a passage leading from said inter-l
said cylinder in response to an action of the dia
mediate> compartment into said impelling liquid
phragm, means adapted to establish a force
compartment, a valve adapted to open and close
against said piston in the opposite direction to 35 said passage, means adapted to open- said valve
said movement, a valve adapted to maintain a
in response to an action of the diaphragm, and
position in controlled relation to the position of
means adapted to close said valve.
said piston and to close said passage between said
l0, A diaphragm pump embracing an enclosed
chamber and said impelling liquid compartment
space divided by a diaphragm into a pumpingin response to movement of said piston under the 40 compartment and an impelling liquid compart
influence of said force, and means adapted to con
ment, an intermediate compartment separating
trol the movement of the piston due to said force
the impelling liquid compartment from a source
including an oriñce adapted to admit liquid into
of liquid supply, a passage leading from said
said cylinder.
"
source into- said intermediate compartment, a
6. In` a diaphragm pump wherein the dia 4:3 valve in said passage adapted to admit liquid into
phragm is adapted to move in response to the ac
and to close against the flow of liquid out of said
tion of impelling liquid in contact therewith, a
compartment, a passage leading from said inter»
chamber adapted to act as a source of impelling
mediate compartment into said impelling liquid
liquid and spaced from the impelling liquid in
compartment, a valve adapted to open and close
contact with said diaphragm, valve means respon
said passage, means adapted to open said valve in
sive to the position of said diaphragm to permit
>communication between said chamber and the
impelling liquid in contact with said diaphragm,
whereby the opening of said valve is controlled by
the movement of said diaphragm and the closure
of said valve is controlled by the metering of liq
uid into a ñuid chamber associated with said valve
means.
'
7. In a pump, a compartment, a tubular dia
response to an action of the diaphragm, means
adapted to close said valve, and means adapted to
retard the closure of said valve, said means in
cluding a. chamber, a passage communicating said
chamber with a body of liquid in the pump and
means adapted to vary the volume of the space
enclosed in said chamber in response to an action
of the diaphragm.
Y
Vll. A diaphragm pump embracing an enclosed
phragm adapted to be mounted in said compart 60 space divided by a diaphragm into a pumping
ment and to divide the same into an inside pump
compartment and an impelling liquid _compart-V
ing compartment and an outside impelling liquid
ment, a passage leading from said impelling liquid
compartment, an auxiliary supply chamber, valve
compartment to a point exterior to the pump andv
means adapted to permit or prevent the flow of
adapted
for the expulsion of fluid from the pump,v
liquid from said auxiliary chamber to said im 65 an intermediate compartment separating the im
pelling liquid compartment and from said im
pelling liquid compartment from a source of liquid
pelling liquid compartment tc 'said supply cham
supply, a passage leading from said source into
ber, the opening of said valve means being con
said intermediate compartment, a valve in said
trolled by the position of said diaphragm at the
passage adapted to admit liquid into and to closey
end of its suction stroke and closure of said valve
against the flow of liquid out of said compart
means being controlled by metering of liquid into
ment, a passage leading from said intermediate
a fluid chamber associated with said valve means.
compartment into said impelling liquid compart
8. In a diaphragm pump wherein a diaphragm
ment, a valve adapted to open and close said pas-f.
dividing an enclosed space into a pumping com
partment and an impelling liquid Vcompartment is 75 sage, meansV adapted to open said valve in response,v
2,405,734
10
to an action of the diaphragm, and means adapted
to close said valve.
12. A diaphragm pump embracing an enclosed
partment, said diaphragm being adapted to pul
space divided by a diaphragm into a pumping
liquid in said impelling liquid compartment and
compartment and an impelling liquid compart
ment, a passage leading from said impelling liquid
to cause successive periods of change in the vol
ume of said pumping compartment; means
compartment to a point exterior to the pump and
adapted for the expulsion of fluid from the pump,
an intermediate compartment separating the im
pelling liquid compartment from a source of liquid
supply, a passage leading from said source into
said intermediate compartment, a valve in said
passage adapted to admit liquid into and to close
pelling liquid compartment and a pumping com
sate in response to a reciprocating movement of
adapted to admit liquid into said impelling liquid
compartment, means adapted to function in re
sponse to an action of the diaphragm and to cause
said ñrst named means to admit said liquid, and
means adapted to control the volume of liquid
admitted by said first named means, said means
being adapted to function in accordance with the
against the flow of liquid out of said >compart
ment, a passage leading from said intermediate
position occupied by the diaphragm at the ter
compartment into said impelling liquid compart
the pumping compartment.
ment, a valve adapted to open and close said pas
sage, means adapted to open said valve in re
sponse to an action of the diaphragm, means
pumping chamber, an impelling liquidr chamber,
mination of a period of change in the volume of
14. In
a
diaphragm pump incorporating a
and a diaphragm forming a dividing Wall between
adapted to close said valve, and means adapted to
20 said chambers, an intermediate chamber between
retard the closure of said valve, said means in
the impelling liquid chamber and a source of
cluding a chamber, a passage .communicating said
liquid supply, and means adapted to operate in
chamber With a body of liquid in the pump »and
response to the action of the diaphragm and to
means adapted to vary the volume of the space
cause the transfer of liquid from the intermediate
enclosed in said chamber in response to an action
25 chamber into the impelling liquid chamber and
of the diaphragm.
'
from the source of supply into the intermediate
13. In a pump characterized by a chamber and
chamber.
a diaphragm dividing said chamber into an im
HARRISON S. COE.
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