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Патент USA US2408919

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Oct. 8, 1946.
E. J. D-ILLMAN El'AL
_ 2,408,919.
REFRIGERATION EXPANSION VALVE
Filed April 5, 1945
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INVENTORS
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BY W m,
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M ATTORNEY
Oct. 8, 1946.
E. J. DILLMAN ETAL
REFRIGERATION EXPANSION VALVE
3 Sheets-Sheet 2
Filed April 5, 1945
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IN VEN TORS
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XXI-bu ATTORNEY
Patented ‘Oct. 8, 1946
2,408,919
UNITED STATES PATENT’ OFFICE
2,408,919
,
REFRIGERATION EXPANSION VALVE
Earnest J. Iliillman and Franklyn Y. Carter, De
troit, Mich., assignors to Detroit Lubricator
Company, Detroit, Mich, a corporation of
Michigan
Application April 5, 1945, Serial No. 586,668
14 Claims. (01. 62-8)
1
.
_
2
Fig. 10 is a detail view in side .elevation of the
valve of Fig. ‘Twith parts broken away to show
This invention relates to new and useful im-_~
provements in expansion valves for controlling
the ?ow of refrigerant and more particularly to
such a valve which is operated in accordance with
both the temperature and the pressure of the
internal construction, and
'
.,
Fig. 11 is an enlarged detail view of a modi
?cation showing means for anticipating flooding
of the evaporator.
Referring to the drawings by characters of
reference and particularly Figs. 1 to 5, the nu
refrigerant.
In mechanical refrigeration systems of the com
pressor condenser type it has been customary to
utilize an external pressure or equalizer line or
meral I designates generally a motor driven com
conduit to convey pressure from the evaporator
outlet to the'valve operating pressure responsive
member. It has also been customary to utilize a
liquid charged power element having a feeler bulb
pressor controlled in its cycle of operation by
any of the well known devices. The compressor
I discharges through a pipe or conduit 2 into the
usual condenser 3 which feeds into a receiver 4
from which a pipe or conduit 5 which is the
refrigerant liquid line connects as at 6 to the inlet
or member to sense the temperature at the out
let of the evaporator to actuate the power ele
ment for operating the valve in accordance with
1 of‘ the thermostatic expansion valve 8 which
is shown as of the multiple type having outlet
connections 9, I0 connected by pipes or conduits
II, I2 respectively to the inlets of evaporators
or the multiple passes l3, M of an evaporator.
The outlets of the evaporators I3, I13 are con
temperature changes.
It is one object of this invention to provide an
expansion valve responsive to both the temper
ature and the pressure adjacent the outlet of
the evaporator without the necessity of using
either the equalizer connection or the feeler bulb.
nected to a common refrigerant return or suc
tion line or conduit I 5 which is connected by the
inlet ?tting I6 to the pressure chamber I"! of the
Another object is to provide a valve which will
respond accurately to both temperature and pres
expansion valve. The chamber I? is intercalated
sure changes and control the flow of the refrig
erant with a minimum of surging.
Another object is to provide a valve which is
in the suction line and flow‘ from the chamber
discharges through an outlet ?tting I8 having
connected thereto the suction line‘or conduit I9
which connects into the suction side of the com
capable of commercial quantity production and
which is of low cost construction.
_
V
The invention consists in the improved con 30 pressor I.
The expansion valve 8 has a housing or body
struction of parts to be more fully described
member which includes a cup-like casing 20
hereinafter and the novelty of which will be
particularly pointed out and distinctly claimed.
which forms the chamber I‘! andhas a substan
tially cylindrical side wall 2| open at its lower
In the accompanying drawings, to be taken
as a part of this speci?cation, there are fully 35 end. The upper end of the chamber I‘! is closed
by a casing end wall 22. Projecting from the
and clearly illustrated several preferred embodi
opposite faces of wall 22 concentric with the
ments of the invention, in which drawings—
chamber N there is a tubular member 23, see Fig.v
Figure 1 is a. view of the expansion valve in
4 having an external portion 24 and an internal '
side elevation and showing it operatively ar
ranged in a diagrammatically illustrated refrig 40 portion 25 within the chamber I1. At the inlet 7
erant system;
end of the portion 24 which connects to the valve
inlet 1, the hollow interior or bore of the portion I
Fig. 2 is a top plan view of the expansion valve
showing its connecting conduits;
24 is enlarged as at 26 to provide a valve cham
her. The outlet end of the chamber 26 is pro- '
Fig. 3 is a view in section on the line 3-3 of
Fig. 2;
45 vided with a counterbore to receive aitubular ~'
Fig. 4 is a view in section on the line 4-4 of
Fig. 2;
Fig. 5 is an enlarged detail view showing the
inner connection of the valve operating rod or
wire and the diaphragm;
50
Fig. 6 is an enlarged detail view of a modi?ca
tion showing means for equalizing pressure dur
valve seat member 2‘! which projects into the
chamber 26. Surrounding and ?tting the pro
jecting end portion of this valve seat member 21
there is a tubular strainer'member 28 within’the‘
valve chamber 26 and whichis closed at its end
adjacent the‘inlet 7. Within the strainer mem
ber 28 there is a valve member 29 cooperable'with '
ing stoppage of the compressor;
the valve seat member 21 to close the valve port
Fig. 7 is a top plan view of another form of
30 and to throttle ?ow therethrough. ' The valve
thermostatic expansion valve having the inven 55 member 29 has a longitudinal bore therethrough
tion;
which receives a ?exible operating rod or wire, 3|
Fig. 8 is a view in vertical section on the line
which ?ts the valve member bore and‘is secured
8-8 of Fig. '7;
to the valve member by solder as at 3Ia>which also
Fig. 9 is a detail view in end elevation of the
seals the valve member bore. ~Closely adjacent '
valve of Fig. ,7;
and preferably at or in the wall 22, the borepf ‘
2,408,919
3
the tubular member 23 on the outlet side of the
4
The operation of the valve of Figs. 1 to 5 is as
valve seat member 29 has outlet ports 32», 33 lead
follows: The spring abutment disc 43 will have
ing into outlet conduits 34 (of which but one is
shown in section) which have one side formed by
been adjusted to determine the superheat setting
the wall 22 and which receive the ?ttings 9, I0
close at a predetermined di?erence of tempera
or operation of the valve so that the valve will
ture between the temperature of the refrigerant
.leaving the valve for supply to the evaporator
34 are in direct heat exchange contact with the
and the temperature of the refrigerant leaving
wall 22 so that the temperature of the refriger
the evaporator. When the compressor | is start
ant medium leaving the valve is conducted di
rectly to the casing 20. The bore 35 in the tubu 10 ed in operation, the reduction of pressure in the
valve casing pressure chamber I‘! will permit the
lar member 23 extends into the internal portion
diaphragm 46 to expand under the force of the
25 and is closed at its inner end by an end wall
vaporized liquid in the chamber 52 thereby mov
36 having a central aperture therethrough
ing the valve member 29 to open position. Re
through which the valve operating wire 3| ex
tends. This end wall aperture is closed and 15 frigerant medium will therefore flow through the
valve port and outlet ports 32, 33 and the outlet
sealed by a washer or packing member 31 within
conduits 34 to the evaporators I3 and I4. As
the bore 35 and having a tight sliding ?t on the
soon as the valve member 29 opens and admits
wire 3|. The washer 31 is held against the end
refrigerant medium to the conduits 34, there will
wall 36 by a helical coil spring 38 under com
pression and seating at one end on the washer 20 be a cooling of the casing 20 and a consequent
withdrawal of heat from the power element
and at its other end against the valve seat mem
chamber 52 thereby anticipating the ?ooding of
ber 21. The wire 3| vextends into the chamber l1
the evaporators and causing the valve member 29
and has its end extending through a central
;to be throttled or moved toward port closed posi
aperture in a spring abutment member or disc 39.
tion to reduce the rate of admission of the re
This wire end has a head 40 seating in a recess
frigerant to the evaporators. As a result of this
in the disc 39. The head 49 is held in the disc
anticipatory or compensated action by the valve
recess by a diaphragm reinforcing pad or plate
the surging of the valve member and variation
4|, see Fig. 5 which is welded to the disc at a
plurality of points such as indicated by the letter --in the rate of refrigerant supply to the evapo
B. Surrounding the internal tubular member 30 rators is materially reduced so that danger of
?ooding over of refrigerant medium into the
portion 25 there is a helical coil spring 42 which
respectively. The ports 32, 33 and the conduits
seats on the disc 39 and which is held under com
pression at its other end by an adjustable disc or
abutment member 43 which is screw threaded on
the portion 25. The edge of the disc 43 is ser
rated or toothed for cooperation with an adjust
chamber I‘! is eliminated.
Flooding over of re
frigerant medium into the chamber I‘! would
cause complete closure of the valve member 29
. with consequent starving of the evaporators and
ine?icient operation. In addition throttling of
the valve member in anticipation of ?ooding of
the evaporator permits substantially all of the
evaporator to be utilized for refrigeration as dis
4| seats on a metal diaphragm 46 which is rein 40 tinguished from only a partial utilization of the
entire length of the evaporators when surging
forced by a spider 41. The diaphragm and spi
occurs. When the temperature of the refriger
der seat at their marginal edge portion on a
ant medium in the chamber |'| decreases and ap
downward facing annular shoulder 48 adjacent
proaches the superheat setting of the valve, then
the rim of and in the casing side wall 2|. The
the pressure exerted by the vapor of the volatile
spider 41 is secured as by welding at its midpoint
liquid in the chamber 52 will decrease so as to
indicated by the letter A to a stop and supporting
permit the spring 42 to move the valve member
member 49 having an o?set rim 50 engageable
29 further toward closed position. The pressure
with a cap or cover member 5| which holds the
diaphragm in position against the shoulder 48.
in the power element chamber 52 will vary with
the temperature of the vaporized refrigerant me
The cap member 5| forms with the diaphragm 46
dium in the chamber |'| during the operation of
the sealed chamber 52 of the temperature re
the compressor and move the valve 29 toward
sponsive valve operating power element. The
open and closed position to regulate admission of
chambers 52 and I‘! are simultaneously sealed and
refrigerant medium to the evaporators for maxi
the diaphragm 46 and cap member 5| are sealed
mum e?iciency.
to each other and to the casing 20 by a single
Referring to Figs. 7 to 10 inclusive, the valve 8
solder seal as at 53, the solder ?lling an annular
has a housing or body member including a cup
chamber vor recess at the rim edge of the dia
like casing 60 and a tubular member 6|. The
phragm and between the cap member and the
casing 60 is formed by stamping or drawing of a
casing side wall 2|. The cover or cap member 5|
disc of sheet metal intothe shape of a cup hav
is provided with a ?lling or charging tube 54
60
ing a cylindrical side wall 62 with an annular
which opens into the chamber 52 and by which
internalshoulder 63 adjacent its rim or open end
the chamber 52 may beevacuated of air and
and having a bottom wall 64 which forms the up
charged with a suitable volatile liquid of such
per end wall of the chamber IT. The wall 64 has
minute quantity that at some temperature above
the operating range of the valve (which might 65 a central depression or recess through which there
is an aperture 65 receiving the tubular member
he, say! 50° F. or 60° F. in a valve used in air con
6|. The tubular member 6| is provided with an
ditioning), all of the liquid will be in vapor state
annular shoulder which seats on the rim or mar
thereby limiting the maximum pressure in the
ginal edge of- aperture 65 and this joint is sealed
chamber 52 and acting on the diaphragm 46.
The end wall 36 terminates closely adjacent the 70 and the members 6!! and 6| are rigidly secured
and sealed together by swaging of the material of
diaphragm so as to be engaged by the abutment
the member 6| over upon the end wall 64 and by
disc 39 to limit the ?exing of the diaphragm by
the pressure within the chamber 52 and thereby
then solder sealing the joint. The outer or ex
serve as a stop and support to limit maximum
ternal face of the casing end wall 64 is provided
diaphragm expansion.
75 with one or more radial recesses or grooves 66
ing pinion which is insertable into the chamber
I‘! through the opening 44 normally closed by the
cap member 45. The diaphragm reinforcing pad
52,408,919
5
d
extending from the central end wall recess.
Alined with these recesses which are of partial
cylindrical cross section, see Fig. 9 there are cy
lindrical recesses in the side wall of the tubular
member 6!. Accordingly, outlet tubes or con
duits 6‘? will have side wall portions ?tting the
end wall grooves or recess 66 and have their ends
extending into and ?tting the tubular member
tors and increase the cold effect on and the ab~
recesses or sockets as at 68 which joints are sealed
straction of heat from the power element cham
ber 52. This will result in more quickly anticipat
ing the ?ooding of the evaporators and in caus
, ing a greater extent of throttling of the valve
member so as to still further reduce the rate of
refrigerant medium to the evaporators.
It will be apparent that the by pass bleed or
ori?ce lot of Fig. 11 is equally applicable to either
by solder. The contact between the conduits 5? 10 of the valves above described. It will also be ap
parent that the bleed 90 of Fig. 6 can likewise be
and the end wall [it is also a solder connection so
utilized with ‘both of the described valves and can
that the conduits 61 are in direct and intimate
also be utilized with the by pass bleed IUD of Fig.
heat exchange with the casing 60 and the end
11.
wall
The bore 69 of the tubular member 8!
Having thus described the invention, What is
has within the external tubular member portion 15
new and desired to be covered by Letters Patent
‘it an enlarged diameter bore portion ‘ll provid
ing a valve chamber with its inlet provided with
of the United States is:
1. An expansion valve comprising a cup-like
a conical strainer member 12. At the outlet end
casing having an end wall and an opposite open
of the chamber ‘H the bore 69 has a counterbore
to receive a valve seat member 13. C0operable 20 side, a pressure responsive diaphragm closing
and sealing said open side, a cap member sealed
with the valve seat member "13 there is a valve
to said casing and to said diaphragm and form
member ill secured and sealed to a ?exible oper
ing with said diaphragm a temperature respon
ating rod or wire ‘l5 all as described in connection
sive pressure chamber, a volatile liquid in said
with Figs. 1 to 5. The bore 69 on the outlet side
of the valve seat member 13 has outlet ports 15 25 chamber, said casing having inlet and outlet
openings for ?ow of vaporized refrigerant medi
opening into the conduits 61. In this form of
um through said casing in contact with said
valve the helical coil spring 38 within the tubu
diaphragm, a tubular member projecting exter
lar member interior portion 25 does not seat
nally from said end wall concentric with said
against the valve seat member ‘is but is held un
der compression by a separate sleeve member Tl 30 diaphragm and having a longitudinal passage
way therethrough opening into said casing, a
press ?tted within the bore 59 below the ports 76
which are between the sleeve member 11 and the
valve seat member 13. Through the casing side
valve seat member in said passageway, a valve
member in said passageway on the inlet side of
said seat member, valve operating means extend
wall 62 at diametrically opposite points directly
underlying and parallel to the conduits 51 there 35 ing through said passageway and said seat mem
ber and connecting said valve member to said
diaphragm, said tubular member having an out
let from said passageway external of said casing,
and means sealing said passageway around said
ber ll’ is intercalated in the suction line. The 40 valve operating means on the casing side of
said outlet.
valve chamber ‘H has an inlet ?tting 3d by which
2. An expansion valve comprising a cup-like
the valve may be connected to the refrigerant
casing having an end wall and an opposite open
liquid line or conduit 5. The remaining structure
side, a pressure responsive member closing and
of this valve is substantially identical to that of
the valve of Figs. 1 to 5, and therefore, the primes 45 sealing said open side, a cap member sealed to
said casing and to said responsive member and
of reference characters applied to Figs. 1 to 5
forming with said responsive member a tem
will designate the like parts of this Valve, Figs. 7
perature responsive pressure chamber, a volatile
to 10. It may be noted however, that the spring
liquid in said chamber, said casing having inlet
abutment disc
has its serrated rim offset so
that it alines with the suction line ?ttings 18 and 50 and outlet openings for flow of vaporized refrig
erant medium through said casing in contact
"59 thereby eliminating the necessity for the aper
with said responsive member, a tubular member
ture dd since the disc 43' is adjustable through
are apertures which receive and have sealed
therein an inlet ?tting l8 and an outlet ?tting 19
which are for connection to the suction line con
duits l5 and I9, respectively so that the cham
the suction line openings prior to installation of
the valve. The operation of this valve of Figs. '7
to 10 will be apparent from the foregoing de
scri ticn of the valve of ‘Figs. 1 to 5 when it is in
stalled. in the refrigeration system of Fig. 1.
In Fig. 6 the valve seat member 2'! or 13 is
projecting externally from said end wall concen
tric with said responsive member and having a
longitudinal passageway therethrough opening
into said casing, a valve seat member in said
passageway, a valve member in said passageway
on the inlet side of said seat member, valve oper
ating means extending through said passageway
bleed 96 which is of such small size that it will not 60 and said seat member and connecting said valve
shown as provided with a ?xed by pass ori?ce or
member to said responsive member, said tubu
upset the control of the feeding of refrigerant
lar member having an outlet port from said pas
medium by the valve when the compressor is in
sageway external of said casing, a conduit load
operation. However, this bleed will permit the
ing from said outlet port and having direct heat
pressure to equalize in the system during the off
cycle or while the compressor is at rest and there 65 exchange contact with said casing end wall, and
means sealing said passageway around said valve
by provide an unloading means prior to the com
operating means on the casing side of said out
pressor being again placed in operation on the
let.
refrigerating cycle.
3. An expansion valve comprising a cup-like
In Fig. 11 the tubular member interior portion
casing having an open side, a tubular member
is provided with a calibrated bleed ori?ce I99
having a longitudinal passageway therethrough
which discharges into the chamber H and
transverse to the end wall of said casing and
against the valve operating diaphragm. Accord
having inner and outer end portions projecting
from opposite faces of said wall, said outer end
frigerant medium will be supplied directly to the
chamber ll in by passing relation to the evapora 75 ‘portion having a passageway inlet and having a
ingly, when the valve member 29 opens some re
2,408,919
8
laterally directed passageway outlet, a valve seat
member in said passageway between said inlet
and said outlet, a valve member in said pas
sageway inlet and cooperable with said seat mem
ber, a diaphragm closing the open side of said
casing, a reinforcing member movable with said
diaphragm and interposed between said inner
end portion and said diaphragm, a ?exible wire
extending through said passageway and opera
bar operable on temperature increase to move
said valve member toward open position, said
casing having inlet and outlet ports in its side
wall and positioned between said end wall and
said diaphragm for flow of refrigerant through
- said casing in contact with said diaphragm.
6. An expansion valve comprising a sheet metal
cup having a central aperture through its end
wall and having side wall apertures, conduit flt
tively connecting said diaphragm to said valve l0 tings secured and sealed in said side wall aper
member, said reinforcing member being engage
tures, a tubular member extending through said
able with said inner end portion to limit valve
central aperture and sealed therein, a diaphragm
member movement, a cap member sealed to the
closing and sealing the open side of said cup,
open side of said casing and cooperating with
a sheet metal cap member sealed to said dia
said diaphragm to form a pressure chamber, a
phragm and to said casing and forming with said
volatile liquid in said chamber operable on tem
diaphragm a temperature responsive pressure
perature increase to move said valve member to
chamber, a volatile liquid in said chamber, said
ward said open position, said casing having inlet
tubular member having a longitudinal passage
and outlet ports in its side wall and positioned be
way therethrough and having a cylindricai side
tween said end wall and said diaphragm for flow
wall recess external or said cup and communi
of refrigerant through said casing in contact
cating with said passageway, a conduit ?tting
with said diaphragm.
secured and sealed in said side wall recess, valve
4. An expansion valve comprising a cup-like
means in said passageway on the inlet side of
casing having an open side, a tubular member
said recess, means extending through said pas
having a longitudinal passageway therethrough _ sageway and operatively connecting
dia
transverse to the end wall of said casing and
phragm to said valve means, and means clos
having inner and outer end portions projecting
ing the inner end of said passageway around said
from opposite faces of said wall, said outer end
connecting means.
portion having a passageway inlet and having a
7. An expansion valve comprising a sheet metal
laterally directed passageway outlet, a valve seat
cup having a central aperture through its end
member in said passageway between said inlet
wall and having side wall apertures, metal tub
and said outlet, a valve member in said pas
ing secured and sealed in said side wall aper
sageway inlet and cooperable with said seat mem
tures, a tubular member extending through said
ber, a diaphragm closing the open side of said
central aperture and sealed therein, a diaphragm
casing, a ?exible wire extending through said
closing and sealing the open side of said cup, a
passageway and operatively connecting said dia
sheet metal cap member sealed to said diaphragm
phragm to said valve member, a sealing washer
and to said casing and forming with said dia
closing the inner end of said passageway and
phragm a temperature responsive pressure cham~
having a sliding ?t on said wire, a helical coil
her, a volatile liquid in said chamber, said tubu»
spring held under compression by and between
lar member having a longitudinal passageway
said seat member and said washer and holding
therethrough and having a cylindrical side wall
said washer in passageway closing position, a
recess external of said cup and communicating
cap member sealed to the open side of said cas
with said passageway, said end wall having a
ing and cooperating with said diaphragm to form
radial recess alined with said side wall recess,
a pressure chamber, a volatile liquid in said 4-5 metal tubing secured in said radial recess and
chamber operable on temperature increase to
sealed in said side wall recess, valve means in said
move said valve member toward open position,
passageway on the inlet side of said recess, means
said casing having inlet and outlet ports in its
extending through said passageway and opera~
side wall and positioned between said end wall
tively connecting said diaphragm to said valve
and said diaphragm for ?ow of refrigerant 50 means, and means closing the inner end of said
through said casing in contact with said dia
passageway around said connecting means.
phragm.
8. An expansion valve comprising a sheet metal
5. An expansion valve comprising a cup-like
cup having a central aperture through its end
casing having an open side, a tubular member
‘wall and having side wall apertures, conduit ?t
having a longitudinal passageway therethrough 55 tings secured and sealed in said side wall aper
transverse to the end wall of said casing and
tures, a tubular member extending through said
having inner and outer end portions projecting
central aperture and sealed therein, a diaphragm
from opposite faces of said wall, said outer end
closing and sealing the open side of said cup, a
portion having a passageway inlet and having
sheet metal cap member sealed to said diaphragm
a laterally directed passageway outlet, a valve
and to said casing and forming with said dia
seat member in said passageway between said in
phragm a temperature responsive pressure cham
let and said outlet, a valve member in said pas
ber, a volatile liquid in said chamber, said tubu
sageway inlet and cooperable with said seat mem
lar member having a longitudinal passageway
her, a diaphragm closing the open side of said
therethrough and having a cylindrical side wall
casing, a ?exible wire extending through said 65 recess external of said cup and communicating
passageway and operatively connecting said dia
with said passageway, said tubular member hav~
phragm to said valve member, a spring abutment
ing its inner end terminating adjacent said dia
member adjustable on said inner end portion,
phragm to limit inward movement of said dia—
a helical coil spring held under compression by
phragm, a spring surrounding said tubular mem
and between said abutment member and said re 70 ber inner end and opposing inward movement
inforcing member and opposing movement of
of said diaphragm, a conduit ?tting secured and
said valve member by said diaphragm, a cap
sealed in said side wall recess, valve means in
member sealed to the open side of said casing
said passageway on the inlet side of said recess,
and cooperating with said diaphragm to form
means extending through said passageway and
a pressure chamber, a volatile liquid in said cham 75 operatively connecting said diaphragm to said
2,408,919
10
9
erating means extending through said passageway
and said seat member and connecting said valve
member to said diaphragm, said tubular member
valve means, and means closing the inner end of
said passageway around said connecting means.
9. An expansion valve having an operating
range in which it automatically throttles refrig
erant medium flow, comprising a cup-like casing
having an end wall and an opposite open side,
a pressure responsive diaphragm closing and seal
ing said open side, a cap member sealed to said
having .an outlet from said passageway external
of said casing, means to bleed refrigerant medium
from the inlet side to the outlet side of said seat
member when said valve member is closed, and
means sealing said passageway around said valve
operating means on the casing side of said outlet.
casing and to said diaphragm and forming with
12. An expansion valve comprising a cup-like
said diaphragm a temperature responsive pres 10
casing having an end wall and an opposite open
sure chamber, a minute quantity of fluid in said
side, a pressure responsive member closing and
chamber and operable by condensation and va
sealing said open side, a ‘cap member sealed to
porization in the operating range of the valve
to actuate said diaphragm, said ?uid being all
said casing and to said member and forming with
in vapor state at a temperature above the op
said member a temperature responsive pressure
chamber, a volatile liquid in said chamber, said
erating range of the valve, said casing having
casing having inlet and outlet openings for flow
inlet and outlet openings for ?ow of vaporized
of vaporized refrigerant medium through said
refrigerant medium through said casing in con
casing in contact with said member, a tubular
tact with said diaphragm, a tubular member pro
jecting externally from said end wall concentric 20 member projecting externally from said end wall
concentric with said member and having a longi
with said diaphragm and having a longitudinal
tudinal passageway with an inlet and an outlet
passageway therethrough opening into said cas
external of said casing, a valve seat member in
ing, a valve seat member in said passageway, a
said passageway between said inlet and said out
valve member in said passageway on the inlet
let, a valve member in said passageway cooperable
side of said seat member, Valve operating means
with said seat member, and valve operating
extending through said passageway and said seat
means connecting said valve member to said pres
member and connecting said valve member to
sure responsive member.
said diaphragm, said tubular member having an
13. An expansion valve comprising a sheet
outlet from said passageway external of said cas
ing, and means sealing said passageway around 30 metal cup having a central aperture through its
end wall and having side wall apertures, conduit
said valve operating means on the casing side of
?ttings secured and sealed in said side wall aper
said outlet.
tures, a tubular member extending through said
10. An expansion valve comprising a cup-like
central aperture and sealed therein, a pressure
casing having an end wall and an opposite open
responsive member closing and sealing the open
side, a pressure responsive diaphragm closing and
side of said cup, a sheet metal cap member sealed
sealing said open side, a cap member sealed to
to said responsive member and to said casing and
said casing and to said diaphragm and forming
forming with said responsive member a tempera
with said diaphragm a temperature responsive
ture responsive pressure chamber, a volatile liquid
pressure chamber, a volatile liquid in said cham
insaid chamber, said tubular member having a
ber, said casing having inlet and outlet openings
longitudinal passageway open at its end external
for ?ow of vaporized refrigerant medium through
of said cup and having a cylindrical side wall re
said casing in contact with said diaphragm, a
cess external of said cup and communicating with
tubular member projecting externally from said
said passageway, a conduit ?tting secured and
end wall concentric with said diaphragm and
sealed in said side wall recess, valve means in
having a longitudinal passageway therethrough
said passageway, and means operatively connect
opening into said casing, a valve seat member in
ing said responsive member to said valve means.
said passageway, a valve member in said pas
14. An expansion valve comprising a, stamped
sageway on the inlet side of said seat member,
sheet metal cup having an outward facing shoul
valve operating means extending through said
der adjacent its rim and having alined side wall
passageway and said seat member and connect
apertures, the end wall of said cup having a cen
ing said valve member to said diaphragm, said
tral aperture, metal tube ?ttings secured and
tubular member having an outlet from said pas
sealed in said side wall apertures, a tubular mem
sageway external of said casing, and means to
bleed refrigerant medium from said passageway
into said casing adjacent said diaphragm.
11. An expansion valve comprising a cup-like
casing having an end wall and an opposite open
side, a pressure responsive diaphragm closing and
sealing said open side, a cap member sealed to
said casing and to said diaphragm and forming
with said diaphragm a temperature responsive
pressure chamber, a volatile liquid in said cham
ber, said casing having inlet and outlet openings
for ?ow of vaporized refrigerant medium through
said casing in contact with said diaphragm, a
tubular member projecting externally from said
end wall concentric with said diaphragm and hav
ing a longitudinal passageway therethrough open
ing into said casing, a valve seat member in said
ber extending through and sealed in said cen
tral aperture and having a shoulder seating on
said end wall, said tubular member having its
end external of said cup open and having a side
wall opening external of said cup, a metal tube
?tting secured and sealed in said side wall open
60 ing, valve means in and controlling flow through
passageway, a valve member in said passageway 70
on the inlet Side of said seat member, valve op
said tubular member, a pressure responsive mem
ber seating on said shoulder and sealing the open
side of said cup, a stamped sheet metal cap mem
ber seating on said responsive member and ?t
ting said cup, means sealing said responsive
member and said cap member to said cup, a vola
tile liquid in said cap member, and means opera
tively connecting said responsive member to said
valve means.
EARNEST J. DILLMAN.
FRANKLYN Y. CARTER.
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