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Патент USA US2136202

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Nov. ‘8, 1938.
2,136,202
.1. H. WIGGINS
CONTROL- DEVICE FOR BREATHER TYPE STORAGE TANKS
Filed March 3, 1937
- IN YEN TOR:
J H. W/GGINS
MKW
ATTORNEY
Patented Nov.
‘
i‘ i
t
‘UNITED STATES PATENT OFFICE
2,138,202
CONTROL DEVICE FOR BREATHER TYPE
STORAGE TANKS
‘
'
John H. Wiggins, Chicago, Ill.
_
Application March 3, 1937, Serial No. 128,717 ‘
8 Claims.
('01. 220-85)
This invention relates to storage tanks of the
being created therein during the operation of
breather type that are used to hold gases and withdrawing or discharging the material or sub
volatile liquids, and particularly to the control stance con?ned in the tank. The valve C may
devices used in such structures for venting the be mounted directly on a collar 2 that surrounds
_-, tank to prevent an abnormal or dangerous presa hole in the root B, but I prefer to combine said 5
sure from being created therein, and/or to admit valve with a ?ame arrester D through which es
air to the tank to prevent a dangerous minus caplng gases travel before entering the valve
pressure from developing in the tank."
C. Any suitable type or kind of ?ame arrester
One .object of my invention is to provide a may be employed, the One herein illustrated be
".l control device of the general character above ing of conventional construction and being at- 10
mentioned that is inexpensive to construct, easy ‘ tached to a cover plate 3 on the collar 2 carried
to install and in which the coacting parts are by the roof B of the tank. The valve C is mount
of novel construction and arrangement.
ed on the upper end of said ?amearrester and
Another object of my invention is to provide hence the ?ame arrester constitutes a passage
15 a volume control valve or a combined volume
control and vacuum vent valve for breather type
storage tanks which is of such design that it can
be easily combined with a conventional ?ame
arrester without modifying or changing the con20 struction of the ?ame arrester.
'
way for gases that are caused to escape from 15
the tank to vent the same, and it also constitutes
a passageway for air that is admitted to the
tank to prevent a dangerous minus pressure from
being created.
Preferably the valve C comprises a body or 20
And still another-object of my invention is to casing 4 whose interior constitutes a gas cham
provide a control device of the general type bereX that is always in direct communication
mentioned, that comprises a single ?ame ar- with the gas space of the tank through the pas
rester arranged between the tank and a gas sageway formed by the ?ame arrester D, and
g5 chamber to which air is admitted by a vacuum said gas chamber X is provided at its upper end 25
vent valve, and from which gases are permit- with a gas outlet 5 that is arranged in o?set re
ted to escape by opening a volume control valve lationship with the hole 6 in the bottom of said
that is actuated or unseated by the movement chamber through which the gases enter from
,
of the roof of the tank.
;3)
Figure 1 of the drawing is a fragmentary vertical, transverse sectional view of a breather type
storage tank equipped with a control device constructed in accordance with my present invention, and Figure 2 is an enlarged view of said
33 control device partly in elevation and partly in
vertical section. In the drawing, A designates
a storage tank that may be used for holding
gases or volatile liquids, and B designates a
breather type roof for said tank, which is of
H such construction and arrangement that it is
capable of ?exing upwardly from the position
shown in Figure 1 so as“ to increase the volume
of the gas space of the tank. When the roof B
is in the position shown in Figure 1, it is 511543 tained by beams I that may be supported in any
preferred manner.
The tank A is equipped with a novel control
device herein illustrated as consisting of a combined volume control and vacuum vent valve C
30 mounted on the roof B and having provision for
permitting gases to escape automatically from
the tank A when the roof ?exes upwardly to a
the ?ame arrester D.
Said gas outlet 5 is con
trolled by a vent valve 1 herein illustrated as 30
consisting of a horizontally disposed palate ar
ranged inside of the gas chamber X and adapt
ed to cooperate with a valve seat 8. Air is ad
mitted to the gas'chamber, X by one or more
automatic vacuum vent valves of any preferred 35
construction, designated as an entirety by the
reference character E, said vacuum vent valve E
being equipped with an air inlet valve (not
shown) that opens automatically and permits
air to flow into the gas chamber X and thence 40
through the flame arrester D into the tank A‘
when the internal pressure of said tank drops
to a certain approximate degree.
The volume control valve 1 of the valve C is
normally held against its Seat 8 by a Spring 9 45
and a valve operating rod I0 is provided for
moving the valve 1 in opposition to the Spring
9. As shown in Figure 2, the Valve Operating
rod in is arranged in a vertically disposed tubu
lar member ll whose upper end is attached to 50
the bottom portion of the gas chamber X and
whose lower end portion is attached to the plate
certain approximate position and having pro- Bron which the ?ame arrester is'mounted, the
vision for permitting air to enter the tank A so passageway II for the valve operating rod Ill
55 as to prevent an abnormal minus pressure from being provided at its upper end with ‘a ?ame lli
2,186,202
sealing device I! of any preferred kind that will
prevent a ?ame from passing downwardly
through the valve rod passageway ll into the
tank A. The rod I0 is attached at its upper
end to the volume control valve or vent valve 1
and at the lower end of said rod is a depending
link l3 which carries a tripping block H (see
Figure 1) which is so constructed and arranged
that at a certain point in the upward move
10 ment of the roof B said tripping block will come
in contact with one of the roof supporting beams
I, with the result that if the roof continues to
move upwardly, the rod III will remain at rest
and thus cause the control valve ‘I to open or be
15 unseated. In order to protect the gas outlet
passageway 5 from the elements, a weather hood
or shield I4 is mounted on the top side of the
valve C, said hood being constructed so that it
also serves as a housing for the spring 9 which
20 normally holds the valve 1 seated.
In a control device of the construction above
described, there is one passageway for the incom
ing air and outgoing gases, and there is a sepa
rate passageway for the pull rod ID that actuates
the volume control valve 1. Consequently, it is
possible to provide the device with a single ?ame
arrester that coacts with the vacuum vent valve
and the volume control valve associated with the
gas chamber, Another advantage of such a con
30 trol device is that a ?ame arrester can be easily
combined with the same without the necessity of
making any changes in the ?ame arrester, due,
of course, to the fact that the operating device
which effects the unseating of the valve 1 is ar
35 ranged in a passageway entirely separate and
distinct, and at one side of the ?ame arrester
through which the gases escape from the tank.
In addition to the desirable features above men
tioned, my improved valve C is inexpensive to
40 construct, it is easy to install and it is of suf
?ciently rugged design to insure its functioning
properly when the roof B of the tank moves up
wardly and downwardly in the normal operation
of the tank.
45
Having thus described my invention, what I
claim as new and desire to secure by Letters
Patent is:
1. A control device for storage tanks used to
hold gases and volatile liquids, comprising a valve
50 body having a gas chamber provided with an
inlet through which gases enter said chamber
from the tank, a vent valve for said chamber, and
an operating device for said vent valve arranged
out of the direct path of travel of the gases that
55 enter said gas chamber from the tank.
2. The combination of a storage tank provided
with a vertically movable roof, a valve body on
said roof having a gas chamber equipped with
an inlet for gases which escape from the tank, a
60 vent valve for said gas chamber, and an actuating
device for said valve adapted to be operated by
the movement of said roof and arranged out of
the direct path of travel of the gases that escape
from the tank into said gas chamber.
3. A control device for storage tanks which are
65
used to hold gases or volatile liquids, comprising
a vent valve, a ?ame arrester arranged between
the tank and the ‘body of said vent valve so as to
form a passageway for gases that escape from the
tank or for air that is admitted to the tank, and
an operating device for said vent valve arranged
entirely on the exterior of the ?ame arrester. '
4. A control device for storage tanks, consist
ing of a valve body on the roof of the tank pro
vided with a gas inlet and a gas outlet, said gas
inlet communicating with the interior of the
tank, a vent valve that normally closes said gas 10
outlet, and an operating device for said vent valve
arranged at one side of said gas inlet and pro
vided with a portion that projects outwardly
through a ?ame sealed opening in the casing of
said valve.
.
5. A control device for storage tanks, compris
15
ing a ?ame arrester mounted on the roof of the
tank so as to form a passageway for gases that
escape from the tank, a valve body on said ?ame
arrester having a gas chamber provided with a
gas outlet, a vent valve for said outlet that is
normally seated, and an.operating device for said
vent valve projecting outwardly through a ?ame
sealed opening in said valve body and arranged
outside of said ?ame arrester.
6. The combination of a storage tank provided
with a breather type roof, a ?ame arrester
mounted on the roof of said tank in alignment
with a hole in said roof through which gases
escape from the tank and through which air is
admitted to the tank, a combined pressure relief
and vacuum vent valve mounted on said ?ame
arrester, and an operating device for a venting
element of said valve arranged entirely on the
exterior of said ?ame arrester and provided with
a portion inside of the tank that causes said
venting element to function when the roof of the
tank reaches a certain approximate position dur
ing upward ?exing of same,
7. The combination of a storage tank provided
with a breather type roof, at ?ame arrester 40
mounted on said roof in alignment with an
opening in the roof so as to form a passageway
through which gases can escape from the tank
and through which air can be admitted to the
tank, a valve body having a gas chamber that .45
communicates with the main passageway of said
?ame arrester, an automatic vacuum vent valve
for said gas chamber, a pressure relief valve for
said gas chamber, an operating device for said
pressure relief valve, and a passageway for said 60
operating device arranged entirely on the ex- _
terior of said ?ame arrester.
8. A storage apparatus provided with a mov
able part whose position is adapted to change to
vary the volume of- the gas space of the ap
paratus, a control device carried by said movable
part and provided with a chamber, a. main pas
sageway leading from said chamber/ to said gas
space, a vent valve for said chamber, an actuat
ing device for said vent valve adapted to be 60
operated by the movement of the said movable
part of the apparatus, and a passageway for said
actuating device separate and distinct from said
main passageway.
JOHN H. WIGGINS.
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