US1862311A - Filling station apparatus - Google Patents

Description

June 7, 1932. H. P. KUNG FILLING STATION APPARATUS Filed'Jan. 29. 1930 all m on n .m M bruma.. l llll- T .n Dh M E im r nu nu K A. 4 W o 3 3 H M A v Il; 4 \\\\\\\d,{\vli7 VI. b .5 Gb Y 8 l 3 w J 2 9.. I 0 an 3 3 3 Patented .lune '7, i932 Aras PATE reise HOYWARD P. KLING, F WESTFIELD, MASSACHUSETTS, ASSGNOR T0 MOOR-E AND KLING, ING., 0F BOSTON, MASSACHUSETTS, A. CORPORATION 0F MASSACHUSETTS FILLING STATION APPARATUS Application filed January 29, 1930. Serial No. 424,366.

This invention relates to liquid dispensing system due to a rise in temperature caused apparatus, and particularly to a means assoby climatic or other external conditions. ciated therewith adapted to increase the The system to which the invention applies l safety in dispensing volatile oils such as gasincludes a foot or check valve situated prefoline, and has for its general object to proerably at'the end of the suction pipe or may 50 vide a means to prevent an accumulation of be located in the suction pipe at any conveL excessive pressure within the pumping sysient point, a valve preferably manually opertem between the foot or check valve, and the able situated at the end of or near the end A outlet valve. Y of the outlet or filling pipe, and a pump of A further object of the invention is to prothe rotary type driven by an 'electric motor 55 vide a device which may be readily adapted or other suitable source of power. The pump t0 an existing pumping System, may be of the well known centrifugal type,

A further object of the invention is to proor may be any type of pump which does vide a pressure relieving device which will not actto retain pressure within the outlet by-pass the liquid which escapes during such pipe between the pump and the outlet valve. 60 relief of excessive pressure around the check Due to the requirements of safety when such or foot valve, and back to the interior of the systems are used for dispensing volatile oils tank. such as gasoline, the pump as well as the A further object of the invention is to vproother elements of the system must be liquid 0 vide a by-pass built into the check or foot and gas-tight with relation to the atmosphere. 65 valve having a relief valve operable to open It is the purpose of this invention to provide at a predetermined pressure. a means to relieve any excessive pressure A further Object 0f the invention is t0 prewhich may accumulate in such a system due Y vent the accumulation of dangerous pressure to the causes above suggested. in a liquid dispensing systemV due to the ex- In order to give a more complete concep- 70 pansion of the liquid with changes in temtion thereof a preferred embodiment of the perature. invention is shown as applied to a gasoline rl`hese and other objects and features will dispensing apparatus such as that used along more fully appear from the following specithe highways. A centrifugal pump l is sefica-tion in connection with the accompanying curely fastened to a base 2, and is directly drawing, and will be particularly pointed connected to an electric motor 3 by means of out in the claims. a shaft 5. A packing gland prevents leakln the drawing: g age of the liquid from the pump along the Fig. l is a general view of a liquid clispensshaft 5. The pump 1 has an outlet pipe 6 ing apparatus embodying a preferred form which connects with a flexible hose or filler of the invention. pipe 7 having a manually operable valve 8 Fig. 2 is a view in cross section of a foot therein by means of which the flow of gasoor check valve with a preferred form of the line is controlled. The manually operable invention applied thereto. valve is preferably situated at the end of '1" Fig. 3 is a cross sectional view of a differthe filler pipe, and is preferably of the type ent type of valve having a modified form of disclosed by United States Patent No. the invention applied thereto. 1,722,985. When the valve 8 is closed, and ln the construction of liquid dispensing the motor shut o, no liquid can flow ont systems of the type herein disclosed a danof the filler pipe 7. In order to measure the gerous pressure may accumulate within the quantity of liquid dispensed, a suitable meter such as the flow meter 9 is inserted in the outlet pipe 6. The whole assembly is enclosed in a casing l() through which the dial 11 is made visible to indicate the quantity of gasolene dispensed.

A storage tank 12 is situated below the ground at some convenient point preferably a short distance removed from the pipe to permit the suction pipe 13 to assume an angular position. The suction pipe is connected at its upper end to the intake port of the pump, and extends to and projects into the tank 12 preferably to a point a short distance from the bottom thereof. A foot or check valve 14 is connected to the lower end of the suction pipe to prevent back flow of the liquid. The valve 14 may be of any desired construction. As herein shown the valve consists of a double poppet gravity closing type having a casing 15 within which are located two valve seats 16 and 17, one above the other and in series with relation to the flow of liquid. The sleeves 16 and 17 receive the valves 18 and 19 which are accurately guided to their seats by means of the stems 2O and 21 which move vertically in guides 22 and 23. The lower end of the valve 14 is provided with openings 24 which are covered with filtering screens 25 to prevent the passage of foreign matter into the system. A free passage of liquid is permitted upwardly, and any down flow is instantly checked by the valves 18 and 19 when the suction of the pump is discontinued. The valve 14 may be located at any convenient point in the suction pipe such as the position indicated in dotted lines Fig. 1 just above the tank.

From the foregoing, it will be observed that the whole system included between the foot or check valve 14 and the outlet or filler valve 8 is liquid and gas tight. Furthermore any pressure which exists in the system beyond the pump will be equal to the pressure in the suction pipe with the exception of the slight effect of the difference in head due to the difference in elevation between the filler pipe and the suction pipe. This condition results from the fact that the particular type of pump employed in such systems, as above described, when idle offers no substantial restriction to an equalization of pressure throughout the system. In fact since it is dangerous pressures which may burst a filling hose or cause injury to other parts of the system and which are of a magnitude in excess of the maximum working pressure, such pumps can be said to offer no material resistance to an equalization of excessive pressure throughout the system even when they are in operation. In operation, therefore, the valve 14 and the valve 8 retain a solid column of liquid having no outlet. If a rise of temperature occurs within the liquid due to climatic or other conditions, a dangerous pressure may accumulate between the valves, al condition which is not only dangerous but is usually forbidden by law.

In order to prevent such a condition the present invention provides a means t0 bypass such pressure back to the storage tank 12. Such a by-pass may be inserted at any convenient point in the system. @ne desirable method is to provide a by-pass 27 leading from the upper chamber 28 of the valve 14 to the lower chamber 29 which communicates with the tank 12. The by-pass may be constructed in any suitable manner such as by casting integral with the casing 15 of the valve or may be fabricated of standard pipe fittings as herein shown. In the latter case a relief valve casing 30 is inserted into the by-pass assembly, and has mounted therein a spring-actuated relief valve 31 which opens when an excessive pressure accumulates in the system by-passing the surplus liquid to the lower chamber 29 which reduces the excessive pressure to a value below or equal to a predetermined limit as determined by the spring 32. at which time the valve 31 will close.

Other methods of by-passing the fluid may be utilized. In Fig. 3 an elbow check valve is shown which may be inserted in the suction pipe 13 at a point occupied by the elbow 33, in which case the elbow valve will take the place of and function in the same manner as the check valve 14. In the construction of the elbow valve a specially formed casing 34 contains a relief port 35 which leads from the chamber 36 above the valves 37 to the chamber 38 below the valves. This relief port has a relief valve 39 therein which relieves excessive pressure in the system above the valve 32 in a manner similar to the relief valve 31.

In order to facilitate assembling of the valve 32 and to provide for adjustment of the relief valve 39 an opening 4() is formed in the casing 34 thereof. This opening is normally closed by a removable plug 41.

It is within the scope of the present invention to provide any suitable means to relieve excessive pressure within the system. For instance a relief valve may be inserted in the check valve itself or in the valve stem.

Having thus described the invention, wh at is claimed as new. and desired to be secured by Letters Patent.I is:

1. A check valve for liquid dispensing systems adapted to be connected in series with the suction line thereof comprising a casing, an automatically closing valve therein acting to prevent back flow of liquid, chambers above and below said valve, a b v-pass connecting said chambers, and a relief valve in said bypass opened at a predetermined pressure to by-pass the liquid from the upper to the lower chamber.

2. In a liquid dispensing system, a check valve in the suction line thereof acting to HOWARD P. KLING.

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