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Патент USA US3094288

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June 18, 1963
c. o. MYERS
, 3,094,231
BOILER TOP MOUNTING ARRANGEMENT FOR
PRESSURE RELIEF VALVES“
Filed May 5,
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1961
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United States Patent 0 ”
1
3,094,281
BOILER TOP MOUNTING ARRANGEMENT FOR
PRESSURE RELIEF VALVES
Carl 0. Myers, 1155 N. High St., Columbus, Ohio
Filed May 5, 1961, Ser- No. 108,082
3 Claims. (Cl. 231-63)
3,094,281
Patented June 18, 1963
2
in the accompanying drawings forming a part of this
speci?cation and in which like numerals are employed to
designate like parts throughout the same:
FIG. 1 is a diagrammatic elevational view of the perti
nent portions of a closed hot water heating system em
bodying the present mounting arrangement for isolating
system air from the pressure relief valve of the system;
FIG. 2 is a vertical sectional view through a typical
pressure relief valve; and
FIG. 3 is an enlarged side elevational view illustrating
boiler top mounting arrangement ifor-a pressure relief 10
a preferred dip tube ?tting structure utilized for direct
valve wherein the valve connection to the boiler pre
boiler top mounting of the pressure relief valve.
vents loss of system air through the valve.
Referring now to the drawings, for purposes of illus
It is well established that in closed hot water heating
trative disclosure, a closed hot water heating system is
systems the water being heated in the boiler releases air
which rises in the form of bubbles to gather at the top 15 shown in FIG. 1 wherein the numeral 10 designates a
hot water boiler having a water supply pipe 11 for cir
of the boiler. Modern systems are arranged to allow
culating hot water to the system radiation, not shown.
air bubbles to accumulate at the top of the boiler and in
To provide for the thermal water expansion and to facili
clude facilities for directing such accumulated air to a
tate separation of air from water a pipe 12 is shown
compression tank to act as an air cushion (for absorbing
normal expansion of the system water during each heat 20 leading directly from the top of the boiler to the com
pression tank 14. A cold water ?ll line 15 with a hand
ing cycle.
This invention relates to closed hot water heating sys
tems and more particularly is concerned with a novel
a system better illustrates the action of the system air.
operated ?ll valve or cook or a pressure reducing valve
is shown connected to line 12.
When the burner is operating and heat is applied to the
During the operation of this system, air is freed from
A description of a typical cycle of operation for such
boiler, air bubbles are released by the water in the boiler 25 the water being heated in the boiler and rises in the form
of bubbles to gather at the top of the boiler. This air
and the boiler water also expands to force water into
is guided through the pipe 12 to the air cushion in the
the compression tank as system pressure increases. The
top of the compression tank. Closed hot water heating
water that enters the comparatively cool compression tank
systems of this general type are equipped with a pressure
absorbs air ‘from the air cushion at the top of the tank.
When the thermostat turns off the fuel burner, the boiler 30 relief valve 16 mounted in the top of the boiler 10‘ and
the construction of one such typical valve is shown in
water cools, system pressure is reduced and water hav
FIG. 2. The valve 16 includes a casing 17 having an
ing entrained air absorbed therein ?ows from the com
internally threaded bottom inlet opening 18 leading to
pression tank back to the boiler. ‘The absorbed air in
a seal face 19 that is resiliently biased against an annular
this returning water is again released in bubble form
in the boiler with the bubbles rising to the top of the 35 seat 20. When the system, pressure exceeds a predeter
mined set value, the seal face is forced off its seat to
boiler. Any leak existing at the top of the boiler allows
allow the heating system to discharge through the valve.
air to escape from the system during each heating cycle
In the past, where a pressure relief valve has been
and thus progressively reduces the air cushion in the
mounted at the top of the boiler, the system air gather
compression tank.
In such closed hot water heating systems, it is accepted 40 ing at the-top of the boiler has actually leaked through
the valve’s seal face though such a minute discharge
and preferred practice to mount a pressure relief valve di
through the relief valve has gone unnoticed. Since this
rectly on top of the boiler. It has been determined, how
gathering of air at the top of the boiler occurs during
ever, that in the prior art arrangements of this type, the
air within the top of the boiler can and does leak past 45 each heating cycle, this air loss can accumulate to sub
stantial proportions. Any air lost from such a closed sys
the valve’s seal face to provide a progressive reduction
tem is, in effect, lost from the air cushion in the com
of the air cushion in the compression tank. Ultimately
p-ression tank 114 and causes a proportionate reduction in
the air cushion is reduced to a point where normal water
its cushioning effect leading to the development of exces
expansion occurring during each heating cycle cannot
sive system pressures which in turn must be relieved by
be accommodated without developing system pressures in
discharge through the pressure relief valve.
excess of the relief valve setting.
In accordance with the present invention a novel boiler
Where air leakage through the pressure relief valve
reduces the system air cushion to the point where the
air cushion is unable to prevent an excessive rise of the
system pressure, the relief valve will operate to discharge
water from the boiler, thus reducing the total water con
tent of the system’. Then’ when the boiler cools, lack
of pressure in the system permits a recession of the water
in the radiation at the top of the system. Moreover, the
more often a relief valve operates, the greater its tendency
to leak becomes. This is particularly true as respects air
top» mounting arrangement, indicated generally at 21, is
provided for the pressure relief valve 16 and employs a
dip tube connection projecting into the boiler water to
allow the boiler water to act as a seal for excluding system
air from gaining access to the valve’s seal face and there
by prevents loss of system air due to leakage through the
valve. In FIG. 1, air bubbles rising to the top of the
boiler, merge forming a heavily air laden layer of water
22A at the top of the boiler. Normally, bubble laden
water does not remain beneath the level indicated by
leakage through the valve.
the line 22. Thus the level designated by line 22 may be
The principal object of the present invention is to
considered the effective lower limit of the bubble laden
provide a boiler top mounting arrangement for a pressure
relief valve for preventing air leakage through the valve. 65 layer, or in ‘other words, the water level in the boiler,
and to prevent air from entering the main radiation supply
A more speci?c object of the invention is to provide
line, the extension 11E normally provided in closed type
such a mounting arrangement wherein a dip tube structure
hot water heating systems must project below the level
directly connects the pressure relief valve to the top of
22. As is well known, the extension l11E enables the air
the boiler and projects into the boiler water to exclude
system air from gaining access to the valve.
70 laden water to be trapped in the top of the boiler and
thus avoids the problems that arise when air is permitted
Other objects and advantages will become apparent
to enter the main radiation supply line of the system.
during the course of the following description.
3,094,281
4
The dip tube structure 21 is shown projecting to a point
directly into the opening in said valve and having its
beneath this level to insure that air bubbles are per
lower end projecting into said boiler to a point beneath
the said water level therein to subject the said seal face
to existing system pressure while excluding air of said
manently excluded from the region of the valve seal face.
In the preferred constructional embodiment illustrated
herein, the top of the boiler is provided with an internally
threaded separate opening for receiving the dip tube
mounting structure 21.
The clip tube structure is best shown in FIG. 3 and
utilizes a tubular ?tting 23 having external threads 23E
on its lower end for sealing engagement with the threaded
opening in the boiler 10, and having internal threads
231 at its upper end for sealing engagement with a pipe
stub 24 which is in turn connected directly into the bot
tom opening 18‘ of the relief valve. A section 25 of tub
ing, which may be of steel, copper, or other suitable ma
terial, is rolled into the lower end of the ?tting and is
system from contact and hence possible leakage through
said seal face.
2. In a closed hot water heating system, in combina
tion, a boiler, said boiler being able to collect bubble
laden water to de?ne a water level adjacent but spaced
beneath the top of the boiler, pipe means exiting from
the top of said boiler and adapted to supply hot water
to circulate through said system, said pipe means having
an extension projecting into the boiler to extend below
the water level therein, a compression tank providing an
air cushion for thermal expansion of system water, pipe
means exiting from the boiler at a location above said
permanently ?xed therein by pressing, soldering, brazing
reference level for transferring air bubbles collecting in
or equivalent procedures.
the top of the boiler to the air cushion in said compres
It will be apparent that the present boiler top mount
sion tank, a pressure relief ‘valve having a bottom inlet
ing arrangement for a pressure relief valve is in general, 20 opening communicating with an internal seal face thereof,
useful in any closed hot water heating system wherein air
said seal face being arranged to control ?uid discharge
bubbles are collected .at the top of the boiler and wherein
from said system through said valve, and dip tube mount
a compression tank is arranged to provide an air cushion
ing structure disposed in sealed relation in a separate
for accommodating thermal expansion of the system
opening in the top of said boiler and having its upper end
water.
connected directly into the opening in said valve and
having its lower end projecting into said boiler to a
‘It should be understood that the description of the
point beneath the said water level therein to subject the
preferred form of the invention is for the purpose of
said seal face to existing system pressure while excluding
complying with Section 112, Title '35, of the US. Code
and that the claims should be construed as broadly as prior
air of said system from contact and hence possible
"*1
art will permit.
30 leakage through said seal face.
I claim:
1. In a closed hot water heating system, in combina
tion, a boiler, said boiler being able to collect bubble
laden Water to de?ne a water level adjacent but spaced
beneath the top of the boiler, pipe means exiting from
the top of said boiler and adapted to supply hot water
3. An arrangement according to claim 1 wherein said
separate opening in the top of said boiler has internal
threading de?ning the same and said dip tube structure
includes a tubular ?tting having its upper end connected
directly into the inlet opening of the valve and having its
lower end provided with external threading for direct
to circulate through said system, said pipe means having
sealing threaded engagement in said separate boiler top
opening and a length of tubing having its upper end
secured Within said ?tting and having its lower end pro
for thermal expansion of system water, pipe means exiting 40 jecting into the boiler and extending beneath the Water
level therein.
from the boiler at a location above said reference level
for transferring air bubbles collecting in the top of the
References Cited in the ?le of this patent
boiler to the air cushion in said compression tank, a
an inlet in the boiler and extending below the water
level therein, a compression tank providing an air cushion
pressure relief valve having a bottom inlet opening com
UNITED STATES PATENTS
municating with an internal seal face thereof, said seal 45
face being arranged to control ?uid discharge from said
system through said valve, and dip tube mounting struc
ture disposed in sealed relation in a separate opening in
the top of said boiler and having its upper end connected
2,315,824
Sweeny ______________ __ Apr. 6, 1943
2,396,653
2,695,753
2,699,760
Hermanny ____________ __ Mar. 19, 1946
Kirk ________________ __ Nov. 30, 1954
Tidd ________________ __ Jan. 18, 1955
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