Патент USA US2136202код для вставки
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.