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Патент USA US2057194

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Oct. 13, 1936.
’
2,057,194
E. KAGI
SAFETY DISCHARGE VALVE
Filed July'so, 1934
Fig.1
2 Sheets-Sheet 1
Fig. 3
1:
\nvemor 2
'
Oct. 13, 1936.
2,057,194
E. KA‘GI
SAFETY DISCHARGE VALVE
Filed July 50, 1934
2 Sheets-Sheet 2
,f/l z
Patented Oct. 13, 1936
2,e57,194
UNITED STATES
PATENT OFFICE
2,057,194
SAFETY DISCHARGE VALVE
Emil Kagi, Wadenswil, Switzerland
Application July 30, 1934, Serial No. 737,642
In Switzerland July 31, 1933
,
15 Claims.
I have ?led applications in Switzerland on the
31st July, 1.933 and 18th August, 1933.
The present invention relates to safety dis
charge valves for hot water boilers.
The safety discharge valves provided with
weights or loaded pistons have in recent times
been replaced by valves provided with dia
phragms. Such valves become inoperative after
a very short time unless they are interposed in a
10 feed pipe, as otherwise the diaphragms are dam
aged or destroyed by the action of hot water and
steam. Under normal working conditions, valves
provided with diaphragms and interposed in a
feed pipe or conduit work satisfactorily and
answer all requirements. Should it, however,
occur that the temperature regulatorstops func
tioning from any cause so that the water in the
boiler is heated up to steam generating tempera
ture, the result is that the contents of the boiler
20 are forced by the occurring high pressure out of
the boiler and through the safety discharge valve,
so that the boiler contains only steam.
A further result of this failure of the tempera
ture regulator, may be overheating of the heater,
particularly in cases of electrically heated boilers,
until glowing temperature is reached, and ?nally
T3)
the insulation may be set on ?re endangering the
whole building in which the heaters are used.
The object of the present invention is to provide
O a safety discharge valve or so-called overload
valve, ‘which is adapted to be connected to two
conduits conveying di?erent media, for instance,
hot water and cold water pipes of a hot water
boiler, and is so constructed that the sensitive
(Cl. 122—504)
Fig. 7 is a sectional elevation of a fourth con
struction,
Fig. 8 being a diagram of the arrangement or"
the valve in a boiler circuit.
Referring ?rst to Fig. 1, l indicates a main
valve casing provided with a branch connection
2 for the admission of hot water, a branch con
nection 3 for the admission of cold water and a
branch connection 4 for the discharge of water.
5 indicates a valve mounted in the casing l by
means of a diaphragm 6 and loaded by a helical
spring 8, the compression of which can be regu
lated by means of a screw 1.
From the branch 2
extends downwardly and coaxially with the valve
5 a hot water pipe 9, the lower end of which acts 1
as a valve seat. Coaxially with the pipe 9 extends
a pipe ID the lower end of which also acts as a
valve seat co-operating with valve 5. The valve
5 carries between the pipe it and the lower end
of pipe 9 a tubular member I I which projects into
the annular space between the pipes 9 and It.
The operation of this valve is as follows:-—
If the pressure in the boiler exceeds a prede
termined value, for which the valve loading spring
8 has been set, the valve is depressed and moved 25
from its double seat 9, l3 by the steam pressure
against the action of the spring 8, the flexible
diaphragm permitting of this movement. Hot
water then passes from the pipe 9 into the annu
lar space 13 between the pipes 9 and I0 and flows
into and through the exit branch 4. At the same
time, fresh water passes from the branch 3 into
the annular space 13 and into the exit branch 4.
As soon as the boiler pressure drops to the per
' members of the valve are at least temporarily
mitted value, the operation is reversed, and the
exposed to the action of a cooling medium, in
valve closes under the pressure of the spring i 9.
It may be pointed out that the valve seats con—
trolling the hot water and the cold water ?owing
through the valve can obviously be arranged in
various ways without departing from the scope of
the invention, for instance, they could be ar
ranged in series in the axial direction. The il
such a manner that both the sensitive valve mem
bers and the discharged hot water are cooled
40
upon the valve coming into operation.
Several constructions embodying the features
of the invention are shown by way of example in
the accompanying drawings, in which:
I
Fig. 1 is a sectional elevation of the ?rst con
struction,
45
_
'Fig. 2 is a diagram showing the arrangement
of the valve in a boiler circuit,
Fig. 3 is a sectional elevation of the second
construction,
50
Fig. 4 is a corresponding diagram showing the
arrangement of the valve in the boiler circuit,
Fig. 5 is a section elevation of a third construc
tion,
Fig. 6 a diagram showing the arrangement of
the valve in a boiler circuit, and
lustrated arrangement, however, has the advan
tage of great simplicity.
The diaphragm 6 may be of any suitable ma
terial, for instance, rubber, metal, metal alloy,
or rust-free steel.
Fig. 6 shows diagrammatically the arrange
ment of a counter-current safety discharge valve
according to Fig. 1 in a boiler circuit. B indi
cates the boiler, V the improved valve according
to the invention, K the cold water conduit, H the
hot water conduit and S a valve. The improved
safety discharge valve according to the inven 55
2
2,057,194
tion is suitable also for other installations, and
other media, for instance, gases.
A particularly advantageous construction is
obtained by designing the valve in such a manner
that it may be interposed as a through passage
valve in the cold water pipe of a boiler installa
tion, so that the‘valve and its parts are exposed
even at normal pressure conditions to the cooling
action of the cold water.
Figs. 3 and 4 show by way of example such a
10
construction in which the cold water passes con
01
tinuously around the valve.
cated by arrows.
I claim:
1. In an automatic safety discharge valve for
hot water boilers, the combination of: a valve
casing; a diaphragm-valve and a valve seat in
said casing; a cold water conduit in said casing
for passing cold water through said casing; an
other conduit in said casing for passing a me
dium of a high temperature from the hot water
boiler through said casing; said medium auto
.matically operating said diaphragm valve, and
'
(Fig. 3) is:
' both said conduits being controlled by said valve;
again provided with a branch connection 2 for
said conduits and said diaphragm valve being so
constructed and arranged‘that the sensitive valve
In this construction the valve I
the hot water, 3a for the cold water admission,
31) for the cold water discharge, and 4 for the
safety discharge. The safety discharge branch
‘connection 4, is, in this case, displaced through
90° with regard to the branches 3a and 3b.
20 Otherwise this construction is substantially iden
tical with that shown in Fig. 1. 5 again indi
cates a valve mounted in the casing by means
of a diaphragm 6, 1 is a pressure adjusting screw,
8 a compression spring loading the valve, 9 is
the hot water pipe, [0 a valve socket the lower
end of which constitutes a seat, H a tubular
member connected with the valve and extending
into the annular space l2, l3 between the socket
30
through pipe 9 and branch connection 2 as indi
l0 and the pipe 9.
In Fig. 4.13 is the boiler, K the cold water sup
ply pipe provided with the improved valve V and
an ordinary stop valve S, H is the hot water pipe.
The operation of the valve is as follows:
As cold water continuously enters the valve
35 through branch 3a and is discharged through
branch 3b, the cold water flows continuously
seat, are surrounded and cooled by the cold water
in said cold water conduit, substantially as de
scribed.
'
'
2. An automatic safety discharge valve for hot 20
water boilers, comprising in combination: a casé
ing provided with a permanently ?lled cold water
branch connection; a hot water branch connec
tion to the boiler; and a common discharge con
nection; a diaphragm-valve movable in said cas
ing and adapted to open and close simultaneously
the passages of the cold water and the hot wa
ter through the casing to the common discharge
branch; said diaphragm-valve being automati
cally operated by the pressure of the hot water
and steam coming from the boiler and the cold
Water passage within the valve casing being so
constructed as to enclose and cool the diaphragm,
the valve and the valve seat, substantially as de
35
scribed.
3. In an automatic safety discharge valve for
hot water boilers, the combination of: a casing; ‘
around thesensitive parts of the valve and con
sequently these valve parts are continuously ex
' posed to the cooling action of the water. '
members, viz. the diaphragm, the valve and the
a cold water ?lled conduit for passing cold water
If the
through the casing; a high temperature medium .
pressure in the boiler exceeds the permitted value
conduit for passing hot water and steam from
determined by the compression of the spring 8,
the boiler through the casing; diaphragm-valve
the valve 5 is opened by the overpressure of the
hot water {against the action of the spring 8, the
means in said casing for controlling the said con
?exible diaphragm 6 permitting of this move
ment of the valve away from the double seat
being automatically operated by the pressure of
the hot water and steam'coming from the boiler;
9, 10.
said coldwater conduit and said diaphragm-valve
Consequently hot water passes through
.40
duits, said valve means being spring-loaded; and
the annular space l2 to the discharge branch 4 . means being so constructed that the said dia
and simultaneously fresh water passes from the
cold water supply into the annular space [3 and
the discharge branch 4. As soon as the boiler
pressure drops to the permissible value, the valve
closes.
55
60
65
70
'
phragm and valve are surrounded and cooled by
the cold water, substantially as described.
4. In an automatic safety discharge valve for
hot water boilers, the combination of: a valve
casing; a cold water ?lled conduit for passing.
cold water through said casing; a conduit for
passing hot water and steam from the boiler
through said casing; and a single spring loaded
diaphragm~valve adapted to be automatically
operated by the pressure of the hot water and
steam coming from the boiler and to control si
The construction shown in Figs. 5 and 6 per
mits of greater facility in the disposition of the
valve and the mounting thereof.
In this construction the valve casing I is pro
vided with an annular projecting portion l4 upon
which is turnably mounted a casing [5 contain
multaneously both said conduits, said diaphragm
ing a discharge branch connection 4. The dis
valve being surrounded by the cold water, sub
charge branch 4 can therefore be adjusted angu
larly about the axis of the valve through an angle stantially as described.
5. In an automatic safety discharge valve for
of 360°. After suitable adjustment the casing
hot water boilers, the combination of: a valve
l5 can be ?xed in position relatively to the cas
casing; a cold Water ?lled conduit for passing
ing I by means of a nut l6.
Fig. 6 explains the arrangement of the valve cold water through said casing; a conduit for 65
passing steam and hot Water from the boiler.
according to Fig. 5 in a boiler circuit.
through said casing; a single spring loaded dia
Fig. '7 shows a construction which is substan ‘phragm-valve adapted to be operated by the
tially similar to those shown in Figs. 1, 3, and 5 pressure in said last named conduit and to con
and
trol simultaneously said two conduits; two co 70
Fig. 8 shows the arrangement of the valve ac
axial valve seats co-operating with said single
cording to Fig. '7 in a boiler circuit.
diaphragm-valve, one of said valve seats being
In this construction, hot water coming from associated with the steam and hot water con-'
the boiler enters the valve through the branch duit and the other valve seat being associated
75 connection 4 and is discharged from the valve
with the cold water conduit; the cold water‘con
75
.
2,057,194
d'uit being so constructed as to surround said dia
phragm and valve and the corresponding valve
seat and the portion of the hot water conduit
leading to the valve so as to exert a cooling action
upon them, substantially as described.
-
6. In an automatic safety discharge valve for
hot water boilers, the combination of: a casing;
a high temperature medium admission pipe lead
ing from the boiler and ‘communicating with a
10 ?rst valve seat; a discharge conduit in said cas
ing; a cold water ?lled conduit in said casing; a
tubular member in said casing in constant corn
munication with said discharge conduit and in
communication with a valve seat controlling the
passage of the cold water, said tubular member
being coaxial with said high temperature me
dium admission conduit; and a single spring
loaded diaphragm-valve operated by the pressure
in said high temperature medium admission pipe
and co-operating with said high temperature
medium admission passage and said tubular
member, said cold water conduit enclosing said
tubular member and said valve, substantially as
described.
7. In an automatic safety discharge valve for
hot water boilers, the combination of: a casing;
a high temperature medium admission pipe lead
ing from the boiler and communicating with a
?rst valve seat; a discharge conduit in said cas
3O ing; a cold water ?lled admission conduit in said
casing; a tubular member in said casing in con
stant communication with said discharge con
duit and in communication with a valve seat con
trolling the passage of the cold water, said tubu
35 lar member being coaxial With said high tem
3 .
member being coaxial with said high tempera
ture medium admission pipe; and a single valve
operated by the pressure in said high temperature
medium admission pipe and co-operating with
said tubular member, said cold water admission
conduit enclosing said tubular member and said
valve, said valve carrying a tubular member pro
jecting into the annular space between said high
temperature medium pipe and said tubular mem
ber, and said valve being spring-loaded and pro
1O
vided with a diaphragm, substantially as de
scribed.
10. In an automatic safety discharge valve for
hot water boilers, the combination of: a casing;
a high temperature medium admission pipe lead 15
ing from the boiler into said casing, the end of
said pipe forming a valve seat; a coaxial tubular
member in said casing, the end of said member
forming a second valve seat; a valve coaxial with
said admission pipe and said tubular member and 20
adapted to co-operate with the said valve seats;
said common valve being provided with adjustable
spring means and a diaphragm, said diaphragm
separating said spring means from the interior of
said valve casing, means for adjusting the com
pression of said spring means accessible from the
outside; a cold water ?lled conduit surrounding
said tubular member and said valve; a discharge
conduit communicating with an annular space
between said’high temperature medium admission
pipe and said tubular member; and a second
tubular member carried by said valve and
arranged in the said annular space, substantially
as described.
11. In an automatic safety discharge valve for 35
perature medium admission conduit; and a single
spring loaded diaphragm-valve operated by the
pressure in said high temperature medium ad
hot water boilers, the combination of: a casing;
pipe and co-operating with said tubular member,
said cold water admission conduit enclosing said
casing; a high temperature medium admission
pipe in said casing; a common discharge branch
in said casing; a tubular member in said casing
a cold water conduit in said casing through which
cold water passes continuously through the cas
mission conduit and co-operating with said tubu- ' ing; a high temperature medium admission pipe
lar member, said cold water admission conduit leading from the boiler into said casing; a com 40
enclosing said tubular member and said valve, mon discharge branch in said casing; a tubular
said valve carrying a tubular member projecting 'member in said casing coaxial with the end of
into the annular space between said high tem
said high temperature medium admission pipe; an
perature medium passage and said tubular mem
annular space between said tubular member and
ber, substantially as described.
said high temperature medium admission pipe 45
8. In an automatic safety discharge valve for being constantly in communication with said
hot water boilers, the combination of: a casing;
common discharge branch; a common dia
a high temperature medium admission pipe lead
phragm-valve controlling simultaneously the
ing from the boiler and communicating with a inner opening of said high temperature admis
?rst valve seat; a discharge conduit in said cas
sion pipe and said tubular member; said valve 50
ing; a cold water ?lled admission conduit in said
and said tubular member being in the line of
casing; a tubular member in said casing in con
?ow of the low temperature medium, the low tem
stant communication with said discharge conduit perature medium conduit surrounding said tubu
and in communication with a valve seat control
lar member and cooling same and the diaphragm
ling the passage of the cold water, said tubular and valve constantly, substantially as described. 55
member being coaxial with said high temperature
12. In an automatic safety discharge valve for
medium admission pipe; and a single spring
hot water boilers, the combination of z a casing;
loaded diaphragm-valve operated by the pres— a cold water ?lled conduit in said casing through
sure in said high temperature medium admission which cold water passes continuously through the
tubular member and said valve and diaphragm,
whereby the valve and valvev seat and diaphragm
are continuously cooled, substantially as de
scribed.
9. In an automatic safety discharge valve for
hot water boilers, the combination of: a casing;
a high temperature medium admission pipe lead
ing from the boiler and communicating with a
?rst valve seat; a discharge conduit in said cas
ing; a cold water ?lled admission conduit in said
casing; a tubular member in said casing in con
stant communication with said discharge conduit
and in communication with a valve seat con
75 trolling the passage of the cold water, said tubular
coaxial with the end of said high temperature
medium admission pipe; the annular space be
tween said tubular member and said high tem
perature medium admission pipe being constantly
in communication with said common discharge
branch; a common diaphragm-valve controlling
simultaneously the inner opening of said high 70
temperature admission pipe and said tubular
member; said valve and said tubular member
being in the line of flow of the cold water, the
cold water conduit surrounding said tubular
member and cooling same and the diaphragm
4.“.
2,057,194
and valve constantly, said valve being spring
of the low temperature medium and the high tern-v“
loaded, substantially as described.
13. In an automatic safety discharge valve for
hot water boilers, the combination of : va casing;
a high temperature medium admission conduit
leading from the boiler to the casing; a cold
water conduit through which cold Water con
tinuously passes through the valve casing; a
perature medium into said common discharge
conduit; said vValve being operated by the pres
sure in said high temperature medium admission
conduit and lying in the line of flow of the low
temperature medium, so that said valve and dia
phragm are continuously cooled by the ?ow of
the cold water, said valve being spring loaded, ‘
common safety discharge conduit through which > substantially as described.
I
15. In an automatic safety discharge valve for 10
10 the high temperature medium and the cold water
can pass out of the casing; aldouble diaphragm
hot water boilers, the combination of: a valve’
valve for simultaneously controlling the passage casing; a high temperature medium admission
of the cold'water and the high temperature me
dium into said common discharge conduit; said
15 :valve being operated by the pressure in said high
temperature medium admission conduit and lying
in the line of ?ow of the cold water, so that said
valve and diaphragm are continuously cooled by
the flow of the cold water, substantially as 'de
20 scribed.
14. In an automatic safety discharge valve for
hot water boilers, the combination of: a valve
casing; a high'temperature medium admission
conduit leading from the boiler to said casing; a
25 cold Water conduit through which cold water con
tinuously passes through the valve casing; a
common safety discharge conduit through which
the high vtemperature medium and the cold water
can pass out of the casing; a double diaphragm
valve for simultaneously controlling the passage
conduit leading from the boiler to the casing; a
cold water conduit through which cold water con&
tinuously passes through the valve casing; ' ‘a 15
common safety discharge conduit through which;
the high temperature medium and the cold water
can pass out of the casing; a double diaphragm-l
valve for simultaneously controlling the passage
of the cold water and the high temperature me
dium into said common discharge conduit; said
valve and diaphragm being operated by the pres‘
sure in said high temperature medium admission ‘
conduit and lying in the line of flow of the cold
Water .so that said valve and diaphragm are con v25
tinuously cooled by the flow of the cold water,’
said common discharge conduit being angularly
adjustable with regard to said casing, substan
tially as described.
EMIL KAGI.
cs0
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