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Патент USA US2128081

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Aug. 23, 1938.
Filed March l, 1937
2 x
Patented Aug. 23, 1938
Edward E. Decker, Weymouth, Mass.
Application March 1, 1937, Serial No. 128,367
3 Claims.
invention relates to a valve for venting air
from steam heated radiators commonly used in
building heating systems and for preventing in
flux of air into the system upon fall of the steam
One. object of the invention is to provide a valve
of Athis character which shall embody a novel and
improved construction, combination and arrange
ment of a casing, an air vent passage, chamber or
tTo duct enclosed within the casing and a thermally
controlled valve, whereby the air shall be vented
from the bottom of the valve casing instead of
from the top> or side as is most common, and so
that thermostatic control of the valve can be ef
fected simply, reliably and inexpensively and the
valve casing shall have a unique esthetic appear
Another objecty is to provide such a radiator
vent valve which shall include novel and improved
thermally operated means for closing the vent
upon inñux of steam into the casing whereby the
valve shall be quickly and accurately operated
and firmly held in closed position while steam is
present in the valve casing.
A further object is to provide in such a valve
a novel and improved construction, combination
and arrangement of an air vent passage and a
valve for closing the passage upon a fall in steam
pressure in the system so as to prevent influx of
30 air into the system through the valve.
Another object is to provide in such a valve a
novel and improved combination and arrange
ment of flood check valve and float for preventing
water from entering the valve from the. boiler.
Other objects, results and advantages of the
invention will appear from the following descrip
tion when read in conjunction with the drawing
in which.
Figure 1 is a vertical longitudinal sectional
view through a radiator vent valve embodying my
Figure 2 is a transverse. vertical sectional view
through the valve showing it attached to a radia
Figure 3 is a horizontal sectional View on the
line 3-3 of Figure 1, and
Figure 4 is a horizontal sectional View on the>
line 4-4 of Figure 2.
Specifically describing the invention, the valve
50 comprises a casing including a cup-shaped base
section I preferably stamped from sheet* metal
and an inverted cup-shaped body section 2 having
its rim soldered within the rim of the base section
I as at 3. The casing is preferably approximately
55 oblong rectangular in plan view and side eleva
tion, anda nipple 4 is secured‘to and projects lat
erally from the base section I for connection to a
A. of the bottom wall of the
tion I `is an' opening formed by an integral in- f Ul
turned annular flange 5 in which is ñtted'as by a
press ñt, a tube ß which‘ïprojects` centrally up
wardly in the casing and terminates short of the
top thereof. This tube forms a vent passage for
air from the radiator and valve casing.
Secured on the upper end of the. .tube 6 is a
bracket 'i preferably bimetallic so as to be respon
sive to changes in temperature in the valve cas
ing. This lbracket includes the collar 8 which.
surrounds and is secured to the tube 6: and two '115
diametrically opposite upwardly inclined arms 9,
the arms being so formed that upon increase and
decrease in temperature within the valve casing
the arms are caused to ñex toward and from each
other, respectively. The extremities ofthe arms 20
9 are returned tol form ears> I0.
The arms 9 also
have longitudinal slots or openings II, and a bi
metallic thermostatic strip I2 lies in said slots and
yhas its ends seated beneath the ears „10. The
central portion of the strip I2 carries a valve‘hea-,d 25
I3 adapted to seat upon the end of the tube Ii and
close. the passage therethrough. The strip I2 is
bowed between its ends toward its center and
toward the seat at the end of the tube 6, and nor
mally holds the valve head I3 unseated as shown 30 I
in Figure 1 when the strip is cool.
In operation of the valve so far described, when
the valve is cold, as before steam enters the radi
ator to which the valve is attached, the valve
head I3 is unseated to permit air to pass from 35
the radiator through the nipple 4 into the casing,
and from the interior of the casing through the
vent tube 6 outwardly to the atmosphere. As
steam enters the valve casing, the thermostatic
strip I2 expands or elongates, and its ends being 40
held against movement in the ears I0, the strip
il’eXes toward the end of the tube 6 so as to seat
the. valve head I3. Simultaneously the thermo
static arms 9 fleX upwardly toward each other so
as to further influence the valve head I3 against 45
its seat. The valve head is thereby quickly and
firmly seated and will be held on its seat as long
as steam is in the valve casing so as to prevent es
cape of steam from the radiator. '
Upon a fall of the pressure of the steam in the 50
radiator which causes the temperature in the
valve casing to drop, the thermostatic strip I2
and the arms 9 operate to unseat the valve head
I3. To prevent an infiux of air through the valve
into the radiator as the valve head I3 is unseated, 55
I provide a ball check I4 at the lower end of the
tube 6 to cooperate with the valve seat I5, the
ball being normally supported by sheared lugs I6.
As the pressure in the valve casing falls below
atmospheric pressure, the partial vacuum draws
the ball I4 to its seat to prevent entry of air
through the tube 6.
To provide against ñooding of the valve by
flow of Water from the boiler into the radiator,
10 the nipple 4 has a ball check I'I cooperating with
a seat I8 and held in position by sheared lugs I9.
This ball I'l is normally held unseated against
on and opening through the bottom of said cas
ing and with its other end disposed within the
casing adjacent the top thereof, a bracket mount
ed on said tube with an arm projecting laterally
from each of opposite sides thereof, a valve head
to seat on the end of the tube for controlling
communication between the interior of said cas
ing and the passage through said tube, a bi
metallic thermostatic strip extending transversely
of said upper end of the tube and having its ends 10
fixed in the respective arms of said bracket, said
valve head being mounted on said strip inter
the steam pressure by engagement with the side - mediate the ends of the latter and seated on and
of a float 20 which is slidable upon the tube 6.
unseated from the end of the tube upon ñexure
15 Upon initial entry of water through the nipple 4
into the valve. casing, the float is elevated away
from the ball I'l whereupon the ball will engage
the seat I8 to stop further now of water into the
To restrict flow of water into the upper part
of the casing and into the vent tube 6 under ab
normal conditions, I provide a baille plate 22 dis
posed transversely of the casing below the upper
end of the tube 6 and having small openings 23
25 to permit passage of air and steam past the plate.
It will be observed that my invention provides
a highly sensitive quick-operating thermostatic
mechanism for seating the valve head I3. The
use of the vent tube 6 which provides a vent pas
sage, chamber or duct enclosed within the valve
casing admits of the utilization of my highly
effective thermostatic valve operating mechanism
and avoids the necessity for unsightly projections
on the valve casing, so that the casing may have
35 a pleasing and esthetic appearance.
It will be understood by those skilled in the
art that many modifications and changes may
be made in the details of construction of the
valve without departing from the spirit or scope
40 of the invention.
Having thus described my invention, what I
claim is:
1. A ‘radiator vent valve comprising a casing
h_aving an inlet adjacent its bottom to be con
nected to a. radiator, a tube secured at one end
of said strip under influence of temperature 15
changes in said casing.
2. A radiator vent valve comprising a casing
having an inlet to be connected to a radiator,
there being a Vent passage leading from the
interior of said casing to the atmosphere and 20
having a valve seat, a pair of bimetallic thermo
static arms each mounted at one end and in
clined upwardly from one of opposite sides of
said valve seat so as to swing toward and from
the other upon increase and decrease in tem' 25
perature respectively in said casing, a bimetallic
thermostatic strip extending transversely of said
seat and having each end iìxed on one of said
arms, and a valve head carried by said strip
intermediate its ends to cooperate with said valve 30
seat, whereby upon increase and decrease in tem
perature in said casing said strip is flexed be
tween its ends to move said valve head toward
and from said seat respectively.
3. A radiator vent valve including a casing 35
having an inlet adjacent its bottom to be con
nected to a radiator, a float in said casing nor
mally disposed in juxtaposition to said inlet, and
a ñood check valve and seat in said inlet, said
valve normally contacting with said float and
being thereby normally held unseated whereby
said valve will be released for seating to close
said inlet upon rising of said float as water enters
the casing-
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