US1747810A - Seal - Google Patents

Description

lwatented Fe. l ll@ aten HROLD V. IWELE, 0F EAMMCND, INDIANA, ASSIGNOR TO STANDARD OIL COMPANY, l? WHITNG, NDANA, A COBPORATIQN OF INDIANA SEAL Application led October 31, 1927. Serial No. 229,990.

The presentinvention relates to improvements in seals or vent valves, more particularly as applied to the vent pipes from the vapor space of gasoline storage tanks and storage tanks for similarvolatile liquids. lt will be fully understood from the following description illustrated by the accompanying drawings, in which:

Figure 1 is a plan View of a valve or seal 1o construction embodying the present invention on the line 1 on Fig. 2, the cover being removed; l x

Fig. 2 is a sectional elevation on the line 2-2 of Fig. 1;

Fig. 3 is a cross-section on the line 3-3 of Fig. 2; and

Figs. Ll and 5 are details illustrating the mounting of the inverted cup.

rlhe seal of the present invention is an improvenient on the construction of the seal shown in Patent No. 1,529,682, granted March 17, 1925, on the application of the present inventor and the Patent No. 1,553,848, granted September 15, 1925, on the application of George W.. Chenicek. Y

Referring more particularly to the drawing, the numeral 5 lindicates a vertical vent pipe section which communicates with a danged pipe 6 adapted to be connected to a 3o vent pipe (not shown) from a storage tank.

'lhe vent pipe section;` 5 is preferably of rectangular cross-section and is surrounded by a pan 7 of rectangular horizontal section with suitable outwardly flaring sides 8. @ver the vent pipe 5 is provided an inverted rectangular cup 9, the sides of which surround and en- `close the upper end of the vent pipe section 5. The inverted cup 9 carries a pivot rod 10 which preferably extends across it and prono trudes on either side to engage lugs 11 on the sides of the pan 7. The lugs 11 are cut away -to receive the rod 10 as shown in Fig. 4. The inverted cup 9 is of sucient depth so that its sides enter a body of sealing liquid mainte Ytained in the pan 7.

The inverted cup 9 is constructed upon the With this construction, as is later apparent,

when the sides of the inverted cu'p 9 are partially immersed in liquid in the pan 7, an eX- cess of pressure Within the vent pipe 5 will tend to cause one end of the cup 9 to rise, that end being the portion on the left of the pivot rod 10, as shown in Fi sf 1 and 2. `When the pressure Within the v nt pipe 5 is reduced below that of the exterior atmosphere, reverse action takes place, the -side of the inverted cup 9 having the larer area, being depressed.

Arsl described in atent No. 1,553,848, previously referred to, the ends 13 of the invert'- ed cup 9 which are arallel to the pivot rod 10 may be cut away rom their centers-to each side as shown at 14, to form openings of gradually decreasing area as csaid ends descend into the -liquid in the pan A7 The sides may be similarly cut away as at 15. As a result of this construction, as the end of the pan is forced down into the liquid, a gradually decreasing a erture for the escape of vapors is provide thereby' tending to prevent sudden rushes of gases which would tend to rock the cup.' ln practice,.it is found that-'this expedient is not so necessary on the end of the cup at which air is admitted and accordingly that end is shown unprovided with cut away portions.

As afurther means for preventing oscil-` lation ofthe cup, weight means designated generally 16, `are provided, preferably on each side of the cu Each Weight means 16 comprises a strap l? adapted to lie on the surface of the cup and having depending portions 18 which extend downwardly tothe bottom of the pan 7. At, their lower ends they are connected to a platel of substantial surface area. This plate may suitably be an anglo-piece 19 of light metal. From each of the depending portions 18, straps 20 extend to the pivot rod 10 Which passes through perforations therein so that when the cup 9lt1lts, carrying with it one oit the vveiglit members 16, the latter acts as a rigid unit not subJect to irregular movements which would tend to `cause erratic movement et .the cup.

rilbe Weight members 16 are of such mass that they prevent tilting of the seal u ntil 'a certain excess pressure exists on one side or the other o' the inverted cup. When this excess pressure is exerted the cup'tilts lifting one of the Weights 16 on its rising end. lVhen the excess pressure is relieved the cup returns to its normal horizontal position. l it tends to go further it is relieved ot the aforesaid Weight member and the other side of the 'cup ascends, picking up the other Weight 16 which acts in opposition ci the tilting movement. Not only does the Weight of the members 18 tend to prevent oscillation, but the flat surfaces of the members 19 oder a substantial resistance to movement through the sealing liquid. As before pointed out the members 19 are capable of moving in a single path so that the resistance is uniform and Without irregularities.

As previously indicated, moet of the rocl- 1 ing to which the inverted cup is subject ap, pears to occur when vapors are being vented.

Accordingly only the Weight 'means on the larger side oli the cup, that is the side on the left in Figs. 1 and 2, may beiprovided With a damper plate. Since, however, the Weight means on both sides act to prevent or minimize rocking however induced, it is preferred to provide Weight means on both sides of the cup. A

A suitable protecting cover 21 is provided over the pan 7, being supported thereon by lugs 22.

Although the present invention has been described in connection with the details of a speciic embodiment thereof, it is not intended ythat such details shall be regardedI as limitations upon the scope of the invention except in so tar as included in the accompanying claims.

I claim:

1. A seal comprising an inverted cup adapted to tilt to one side or theother in accordance with the ditlerence of pressure above and below said cup, means adapted to maintain sealing liquid around said cup, conduit means eomn'iunicating "with 4the underside of said cup, Weight means adapted to be lifted by an end o said cup when it rises, and a resistance plate adapted to be located in said liquid and constrained to minero move by said Weight means in a uniform path therethrough.

2. A seal 4comprising an open conduit member communicating with a vapor space, a pan surrounding said conduit member and adapted to contain a liquid, an inverted pivoted cup over said conduit member. and having its sides partially immersed in liquid in the pan, said cup having its center of pressure offset from its center of gravity, a weight member on onev side of said cup adapted to be raised by said side when it rises, said Weight member being provided With a resistance plate adapted to be immersed in said liquid and constrained to move therethrough 'with the Weight in a denite regular path.

3. A seal comprising an open conduit member communicating with a vapor space, a pan surrounding said conduit member and adapted to contain a liquid, an inverted pivoted cup over said conduit member and having its sides partially immersed in the liquid in the pan, said cup having its center of pressure otl'set from. its center of gravity, a Weight member on one side of said cup adapted to be raised by said side when it rises, said Weight member being constituted by a rigid structure pivotally mounted and comprising a resistance plate adapted to be immersed in the liquid.

d. A seal comprising an inverted cup adapted to tilt to one side or the other in aocordance with the did/creuse of pressure above and belovv said cup, means adapted to maintain sealing liquid around said cup, conduit means communicating with the underside of said cup, a pair of 'weight means, one of which is adapted to be lifted by one end of the cup when it rises and the other is adapted to be raised by the other end of the cup When it rises., and a pair of resistancev plates adapted to be located in said liquid and constrained to move in uniform paths therethrough.

5. A seal comprising an open conduit member communicating with a vapor space, a pan surrounding said conduit member and adapted to contain a liquid, an inverted pivoted cup over said conduit member and having its sides partially immersed in liquid in the pan, said cup having its 'center of pressure odset from its center of gravity, a pair of Weight members. one on eachside of said cup and adapted to be raised by the correspending side of the cup when it rises, each of said weight members being provided with a resistance plate adapted to be immersed in said liquid and constrained to move therethrough with the Weight in a definite regular path.

6. A seal comprising an open conduit member communicating With a vapor space, a pan surrounding said conduit member and adapted to contain a liquid, an inverted ena ,Menem pivoteci cup over said conduit member and having its sides partially immersed in the iiqui in the an, said cup4 having its center of pressure o set from itsrcenter of gravity, a pair ei' Weight members, one on each side of seid @up and adapte to be raised by the eerresponoiiing side of the @up when it rises, earth efr said Weight members being consti- 'iii'zed by e rigid structure pivoaiiy mounted and comprising a. resistaiice piste adapted to be immersed im iheliquid,

En inesiimony whereof' iiiave hereunto set my hand this ih dey of etober, 192?,

MRQLD V. ATi/WELL.

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