US 2966167 A
Description (OCR text may contain errors)
Dec. 27, 1960 J. A. JENSEN RE-FUELING NOZZLES Filed larch 17, 1958 3 Sheets-Sheet 1 alla uvmvrom JamesAJJevwaL, BY
Dec. 27, 1960 Filed llarch 17, 1958 Her: 6
3 Sheet-Sheet 3 INVENTOR. James/L Jensen,
United States Patent RE-FUELING NOZZLES James A. Jensen, Haverford, Pa., assignor to Philadelphia Valve Company, Philadelphia, Pa., :1 firm Filed Mar. 17, 1958, Ser. No. 721,886
Claims. (Cl. 137222) This invention relates to fluid dispensing nozzles. More particularly, it is concerned with dispensing nozzles of the type disclosed in US. Patent No. 2,357,657 granted to me on September 5, 1944, intended for use in re-fueling air planes, automobiles and the like with gasoline or other combustible liquids delivered through a hose from a storage supply source. The patented nozzle was designed for operation against pressures between 30 and 50 lbs. p.s.i., at which pressures it was not difficult to open the nozzle, and closing thereof took place automatically without attendant noise or shock.
In order to speed up re-fueli-ng of air planes, higher pressures up to 100 or 156 lbs. p.s.i. are now being used. At these higher pressures, excessive effort had to be expended to open the nozzle as heretofore constructed, and closing was attended by severe shock and noise as well as by strain upon the hose and other equipment.
The chief aim of my present invention is to overcome the above mentioned drawbacks. This objective is realized in practice, as hereinafter more fully set forth, through improved construction of the interior of the nozzle for attainment of a balanced pressure condition about the main valve, after opening of the small auxiliary poppet valve to render operation of the nozzle very easy against the higher fluid pressures, and its closing to take place with minimized shock and/ or noise.
Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein:
Fig. 1 shows the nozzle of my present invention in side elevation with portions of its body broken out and in axial section, and with the valves at the interior exposed and in open position.
Fig. 2 is a cross section taken as indicated by the angled arrows II-II in Fig. 1.
Fig. 3 is a fragmentary view in axial section drawn to a larger scale, with the valves in closed position.
Figs. 4 and 5 are views similar to Fig. 3 respectively showing the initial stage of opening the nozzle, and the nozzle fully open; and
Fig. 6 is a view similar in turn to Fig. 3 showing how closing of the main valve is retarded with avoidance of shock or noise.
As herein illustrated, my improved dispensing nozzle comprises a hollow body 1 having a swivel connection 2 at its rear or entrant end for attachment to a delivery hose 3, and a connection 5 at its downwardly directed frontal end for attachment of a discharge spout 6, the latter being provided with a cap 7 which is removably held in place by a chain 8 subject to a contractile spring 9. Integral with the body 1 is a loop 10 that provides a hand grasp 11 which is internally threaded at one end to receive the screw tip 12 at the end of a flexible grounding wire or cable 13. The nozzle is manually operable by means of a lever 15 disposed within the opening of the grasp loop 10, said lever being fulcrumed at 16 and having a finger projection 17 in engagement with the outer end of an actuating rod 18. As shown, the rod 18 passes ice through a stutfing box 19 in the forward end of the body 1 and into the interior of the latter. Insofar as described up to this point, the illustrated nozzle is generally similar to the one disclosed in the patent hereinbefore referred to.
In accordance with my present invention there is fixedly disposed axially within the hollow of the body 1 of the nozzle, with liberal surrounding clearance to permit free flow of fluid thereabout when the nozzle is opened, is a dash pot 26. Extending transversely through a rearward coned projection 21 of the dash pot 20 is a small duct 22 which is counterbored at the top and there internally threaded for reception of a small adjustable throttling valve 23 of the pin type. The slotted and threaded head of the throttling valve 23 is accessible for adjustment from the exterior by means of a screw driver upon removal of a screw plug 24 from an opening in the wall of the body 1. As further shown, the duct 22 is in communication with the interior of the dash pot 20 by way of a small crosswise bleed orifice 25 in the back wall of said dash pot. Surrounding the main flow port 26 at the front end of the nozzle body 1 is a beveled valve seat 27; and arranged to cooperate with said seat is a main valve disk 28 having a facing washer 30 of neoprene or other corrosion resistant material, the diameter of the disk being substantially equal to the outside diameter of the dash pot 20. The disk 28 is formed with a small forwardly projection threaded boss 31, and the facing washer 30 is held in place by a clamp element 32 screw engaged upon said boss. The clamp element 32 has a hollow forwardly projecting hub 33 through which the actuating rod 18 passes with a slide fit, and a forwardly beveled peripheral flange 34 which is slightly smaller in diameter than the port 26 and which projects into said port when the valve is closed as in Fig. 3. For a purpose later on explained, the hub 33 of the clamp element 32 is provided with a plurality of circumferentially-arranged apertures 35, see Fig. 2. integrally formed with the valve disk 28 and extending rearwardly therefrom is a hollow cylindric portion 36 with a terminal head 37 to serve as a piston within the dash port 20, said head being of a diameter slightly less than that of said disk, and being peripherally grooved for lodgement of a packing ring 38 and provided with a bleed orifice 39. It is to be noted that the hollow portion 36 is united with the disk 28 by a narrow neck 40. As a consequence of this construction, it will be seen that the frontal areas 36a and 37a of the extension 36 and of the piston 37, taken together, substantially equal the back face area of the valve disk 28.
Arranged to cooperate with a beveled seat 45 surrounding the inner end of the axial bore 46 of the boss 31 of the main valve disk 28 and the neck 40 is a small auxiliary poppet valve 47 of Teflon orthe like which is engaged about the diametrically reduced inner end portion 48 of the stem. The poppet valve 47 is backed, for maintenance in engagement with the shoulder 49 of the stem 18, by a threaded Washer 50, the latter serving as an abutment for one end of a helical spring 51 whereof the other end bears against the back wall of the dash pot 20. To assist in the guidance of the actuating stem 18, the diametrically reduced inner end portion 48 thereof is slidingly engaged in a boss 52 projecting forwardly from the back of the dash pot 20. The actuating rod 18 also has a collar 53 thereon which, after the poppet valve 47 is opened as in Fig. 4, is adapted to engage the front end of the boss 33 of the clamp element 32 to open the main valve 28 as presently explained.
Normally, with the nozzle closed as in Fig. 3, the interior of the dash pot 20 is filled and the piston 37 subjected to the full pressure of the liquid in the hose 3 and to that of the spring 51, as is also the main valve disk 28 which latter is thus firmly maintained in engagement with the seat 27 around the outlet port 26.
Operation With the nozzle held in one hand by the grasp 11, the actuating lever is raised from the normal position in which it is indicated in dot and dash lines in Fig. 1, and the actuating rod 18 thereby moved inwardly or to the right. As this movement of the rod 18 is initiated, the small poppet valve 47 is displaced from its seat 45 against the resistance of the spring 51 as in Fig. 4, with attendant flow of the pressurized liquid, by way of the duct 22 and aperture 25 and the bleed port 39 in the piston 37, into the dash pct and from thence, by way of the bore 46 in the boss of the main valve 28 and the apertures 35 in the hub 32 of the clamp element 32, into the outlet 5 of the nozzle. Due to the greater areas of passages 46 and 35, the liquid escapes faster from the interior of the dash pct 20 than it enters by way of the duct 22 and the bleed port 39 in the piston, the pressure of the liquid upon the back of said piston being thus greatly reduced. A balanced condition is thus created so that very little effort is required to open the main valve 28 as the collar 53 on the rod 18 eventually engages the element 32 during further inward movement of said rod. The valve 28 is eventually stopped in its full open position by engagement with the front end of the dash pct 20 as shown in Figs. 1 and 5.
Upon release of the actuating lever 15, the spring 51, in reacting, first forces the poppet valve 47 to closed position and thereafter urges the piston 37 outwardly of the dash pot 20 with attendant creation of a vacuum within the latter. By action of the vacuum, liquid is very slowly drawn into the dash pot 20 by way of duct 22 and the bleed port 39 in the piston 37, thereby restraining the spring 51 and preventing rapid approach of the valve 28 toward its seat 27. As the valve 28 nears the seat 27, the flange 34 of the element 32, in re-entering the port 26, gradually restricts flow of the liquid into the outlet 5 of the nozzle as shown in Fig. 6 until the valve 28 is fully closed. Due to the retarding effect of the dash pot 20 and the outflow regulating effect of the flange 34, it will be seen that the valve 28 will automatically close smoothly without attendant slap, shock or noise.
The speed at which the valve 28 closes is regulatable by adjusting the needle 23 to increase or decrease the rate of inward flow of the liquid through the duct 22 and, passage as will be readily understood from Fig. 6. This adjustment can be accomplished quickly and easily upon removal of the plug 24, and is advantageous in that it makes possible the adaptation of the nozzle for easy operation against high liquid pressures of different magnitudes. Slowest closing movement of the valve 28 will take place, obviously, when the needle 23 is adjusted to completely close the duct 22, influx of the liquid into the interior of the dash pct 20 being thereby restricted to the port 39 in the piston 37.
While the preferred embodiment of this invention has been described in some detail, it will be obvious to one skilled in the art that various modifications may be made without departing from the invention as hereinafter claimed.
Having thus described my invention, I claim:
1. A nozzle, for dispensing fluids under high pressure, having a hollow body with an outlet at one end terminating in a discharge spout and a connection at the other end for a delivery hose, a dash pot fixedly disposed, with liberal flow clearance thereabout, within the body and having a bleed orifice through the back thereof, a discous valve adapted to cooperate with an annular seat surrounding a port in the front end of the body, the diameter of the valve corresponding to the outside diameter of the dash pot, a piston operable within the dash pot, said piston having a diametrically reduced hollow axial forward extension fixedly connected by a still smaller neck to the valve, the front face area of the piston head and said extension together aggregating the back face area of the valve and said piston head being provided with a transverse bleed aperture; yielding means within the dash pot operative to maintain the valve normally in engagement with its seat; and actuating means accessible at the exterior of the body for moving the valve from its seat against the pressure of the yielding means, the opening movement of said valve being limited by engagement thereof with the open end of the dash pot.
2. A dispensing nozzle characterized as in claim 1, further including an adjustable needle valve for throttling the bleed orifice in the back of the dash pot; and a plug in the wall of the body of the nozzle capable of removal for access to the needle valve from the exterior.
3. A dispensing nozzle characterized as in claim 1, further including a small poppet valve disposed in the diametrically reduced hollow extension of the piston head and adapted to cooperate with an annular seat at the rear end of an axial bore in the main valve; wherein the yielding means is in the form of a coiled spring in compression between the poppet valve and the back Wall of the dash pot; and wherein the actuating means includes a rod to which the poppet valve element is secured, said rod passing through a stuffing box in the wall of the nozzle body and with clearance thereabout, through the axial bore in the main valve, and said rod having a collar to engage the first valve and move it to open position after the poppet valve has been displaced from its seat.
4. The invention according to claim 3, wherein the main valve has a small forwardly projecting threaded axial boss; wherein a non-metallic disk is secured to the face of the main valve by a clamp element screwed onto the boss of the main valve, said element having a hollow hub through which the actuating rod passes with a slide fit, and a forwardly projecting peripheral flange slightly smaller in diameter than the port for the main valve and normally extending part way into said port, and the hub of said clamp element having a series of annularly arranged flow apertures therein.
5. The invention accord-ing to claim 3, wherein the inner end of the actuating rod is slidingly guided in an axially bored boss extending forwardly from the back wall of the dash pot.
' References Cited in the file of this patent UNITED STATES PATENTS 1,031,294 Schutte July 2, 1912 2,357,657 Jensen Sept. 5, 1944 2,630,137 Krone Mar. 3, 1953 2,698,158 Granberg Dec. 28, 1954 2,843,148 Rymills July 15, 1958 FOREIGN PATENTS 159,093 Germany of 1940