US3204876A

US3204876A - Nozzle

Info

Publication number: US3204876A
Application number: US317009A
Authority: US
Inventors: Edward W Elverston
Original assignee: VANELBA CORP
Current assignee: VANELBA CORP
Priority date: 1963-10-17
Filing date: 1963-10-17
Publication date: 1965-09-07
Anticipated expiration: 1982-09-07

Description

Sept. 7, 1965 E. W. ELVERSTQN NOZZLE Filed OCb. 1'7, 1965 6 f E w/g .y 5-

I NVEN TOR fdl/wld WZZI/ersfa BY www@ j 0 ATTORNEYS United States Patent O 3,204,876 NOZZLE Edward W. Elverston, Albemarle County, Va., assignor to Vanelba Corporation, Charlottesville, Va., a corporation of Virginia Filed Oct. 17, 1963, Ser. No. 317,009 4 Claims. (Cl. 239-533) This invention relates to improvements in valved nozzles particularly adapted, although not limited, to use with uids or light to medium viscosity, and suitable for installation in automatic systems such as insecticide spray systems and fuel oil furnaces, etc.

In many fluid dispersing systems, such as those mentioned above, it is essential to proper controlled operation that there be no after-drip from the spray nozzle when the control valve is closed. The nozzles presently in use, although controlled by valves in the system insuring a rapid pressure drop, have a tendency to permit the fluid in the nozzle at the time of shutoff to drip from the nozzle orifice until the nozzle is emptied.

It is the general object of the present invention to pro vide a valved nozzle which is operated by pressure of the fluid in the system, and which will not drip after its valve is closed.

A more specific object of the invention is to provide a nozzle incorporating an improved pressure operated valve.

Another object is to provide a nozzle of this type having a system of fluid outlet passageways, or orifices, which are designed to cause residual uid in the orifices after valve closure to be retained to prevent drip.

A further object is the provision of separate nozzle tip and valve seat members to permit change of nozzle tip without disturbing the machined relationship of the valve seat and the valve.

Yet another object of the invention is to provide a dripless valved nozzle wherein the valve stem is mounted for free floating action and is supported at both ends for true longitudinal movement and precise registry with the valve seat.

Other objects of the invention will become apparent from the following description of one practical embodiment thereof, when taken in conjunction with the drawings which accompany, and form part of, this specification.

In the drawings:

FIGURE l is a side elevation of a nozzle incorporating the principles of the present invention;

FIGURE 2 is a vertical, longitudinal section through the nozzle shown in FIGURE l, illustrating the nozzle valve in closed position;

FIGURE 3 is a view similar to FIGURE 2, but with the valve in open position;

FIGURE 4 is a vertical, transverse section through the nozzle taken on the line 4-4 of FIGURE 3; and

FIGURE 5 is an end elevation of the valve seat member.

In general, the nozzle of the present invention includes a casing having a nozzle tip at one end, with afluid pressure operated valve within the casing controlling outflow of lluid through the nozzle tip. The valve and the orices from the valve through the nozzle tip cooperate to achieve instantaneous spray shutoff without drip when the valve is closed.

Referring to the drawings in detail, there is shown a nozzle 1, the body of which is formed by an open-ended tubular casing 2. The casing is divided by a central partition 3 into a valve chamber 4 at one end, and a valve spring chamber 5 at the other. The valve chamber has its end closed by a nozzle tip 6. Within the valve chamber there is a iloating, tluid pressure control valve stem 7.

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The casing is provided with a threaded aperture 8, communicating with the interior of the valve chamber. The aperture forms a fluid inlet to the chamber, and a fluid line, or tube, 9 is threaded into the aperture. Fluid entering the chamber through tube 9 controls the action of valve stem '7, and the valve, in turn, controls the flow of uid from the chamber out through the nozzle tip.

The nozzle tip has an externally threaded body portion 10 for engagement with the internally threaded, fluid chamber-forming end 11 of the casing 2. The body portion of the tip has an annular enlargement 12 which provides a shoulder 13. An O-ring 14 is placed about the tip body to seal between the casing end and the tip shoulder 13 to make the joint between the tip and casing watertight. The exposed end 15 of the tip may take any desired conguration.

Nozzle tip 6 is bored axially to provide a series of coaxial sections of stepped diameter. The innermost section 16 is of the largest diameter and is threaded to be engaged by threads on the body of a valve seat member 17. The intermediate section 18 of the bore is of reduced diameter and has a tapered bottom portion 19 leading to an outlet `spray orifice 20. The valve seat member has a projecting stud 21, which lies concentrically within the intermediate bore section 18, and has a tapered end 22 which lies within the tapered bottom section 19 of the tip bore. The diameters of the stud 21 and its tapered end 22 are such that their surfaces are in contact with the walls of the intermediate bore section and its tapered bottom. The tapered end 22 of the stud is provided with spirally arranged channels 23 which communicate with the outlet spray orifice 20.

The valve seat member 17 has its body threaded into the nozzle tip bore, as described, and has a head 24 by which it may be handled. The head is larger than the body and forms a shoulder 25. An O-ring 26 about the valve seat member body adjacent the head provides a seal between the shoulder 25 and the inner end of the nozzle tip to prevent fluid leakage.

Valve 4seat member 17 also has an axial passageway. This includes a tapered valve seat proper 27, a valve stem guide chamber 28 with which the valve seat proper communicates, and a fluid passage 29 which is a continuation of the guide chamber 28. Near the end of the valve seat member stud portion, axial passageway 29 terminates, and a plurality of connecting ports 30 extend from the passageway 29 in an outwardly diverging direction to the surface of the stud portion to allow fluid in passageway gg to ilow to the channels 23 and the outlet spray orifice Valve stem 7 includes a main stem 31, having a tapered valve 32 at one end, and an abutment plate 33 at the other end. A valve guide 34- projects axially of the stem, beyond the valve 32, for sliding movement in the guide chamber 28 in the valve seat member. A tail guide 35 projects axially of the stem from the abutment plate, for guiding movement in a bearing opening 36 in the partition 3 of the casing. All of the parts of the valve stem are in axial alignment. Valve guide 34 has :a sliding lit within the guide chamber 28 to hold the valve 32 in position for proper seating in the valve seat 27, and is grooved, or fluted, longitudinally, as at 37 to allow free flow of fluid through the chamber 28. The tail guide is circumferentially grooved at 38 to seat on O-ring 39. The O-ring has sliding, sealing contact with the partition wall about the bearing opening 36 in the partition, which will -be made sufficiently thick to provide bearing contact for the O-ring throughout the full range of valve stem .movement. The abutment plate will be smaller in diameter than the interior of valve chamber 4 t-o allow free flow of uid around it, yet will be as large as possible to present ample surface to accumulated uid in the chamber to cause the valve'stem to be moved to valve unseating position when a predetermined fluid pressure is built up in chamber 4. ,The abutment plate will be larger in diameter than the bearing opening 36 in the partition, `so that the abutment plate in striking the partition may serve as a limit stop for valve stem.

The valve stem is yieldingly held in valve-closed posi- -tion by means of a coil spring 40, mounted in the spring chambers of the casing, Spring 441 carries a pressure plate 41 at its end adjacent the casing partition, which is in pressure contact with the end of the tail guide 3S of the valve stem. The opposite end of the spring bears against a -b'ack plate 42, which is threaded for adjustment along screw thread 43 on the interior of the spring chamber wall. The casing is threaded for the full length of 'the spring chamber. Obviously, the further the back plate is threaded into the chamber, the more pressure will be placed upon the valve stem and the greater the force required to unseat the valve. In order that air pressure within the spring chamber behind the back plate can equalize during valve movement, the back plate is provided with Ian air opening 44.

When the nozzle is to be used, a nozzle tip having' the desired `spray orifice is mounted in the casing end. This is done by screwing the valve seat member into the tip bore, and threading the tip into the casing end. This arrangement permits tip changes while maintaining the same valve stem and valve seat member, so that a matched valve stem and valve seat can be kept together even though the nozzle tip is changed. Before using the nozzle, the back plate 42 will be adjusted to put the valve stem under desired pressure.

In operation in a system wherein the pipe line, or tube, 9 has its ow controlled Iby a solenoid valve (not shown) the fluid flow will be started and stopped quickly. As iuid enters chamber 4, pressure will be built up against abutment plate 33 forcing it against partition 3 and lifting valve 32 from its seat. Fluid will ow from chamber 4 through the valve seat 27, valve stem guide chamber 28 along the grooves 37 in the valve guide, passageway 29, diverging ports 30, channels 23 and outlet spray orifice 20. The valve will remain in this position, and fluid will continue to spray from the nozzle tip as long as pressure within the chamber 4 remains at a predetermined level. When uid flow to chamber 4 is cut olf, pressure within the chamber will drop, whereupon spring 40 will move the valve stem to seat valve 32 on seat 27.

As soon as valve 32 seats, spray from the nozzle ceases. The cut-off is instantaneous and complete, and there will be no after-drip. The cut-off is instantaneous, because spring 40 acts quickly .and the valve is guided to a properV seat. There is no after-drip because of the passageway arrangement and passageway size, and because of the pressure seat of the valve. The channels 23 provide one or more wells beneath the level of the outlet orifice into which fluid within the valve seat member Iand tip can accumulate. The orifice and passageway diameters are such that capillary attraction will hold any uid which might be within them.

The valve as disclosed will be fully automatic in operation, will open and close quickly under uid pressure changes in the valve chamber, and when'closed will be dripless.

While in the above one practical embodiment of the invention has been disclosed, it will be understood that the details of construction shown and described are merely by w-ay of illustration, land the invention may take other forms within the scope of the appended claims.

What is claimed is:

1. A nozzle comprising, a tubular casing divided by a transverse partition into a fvalve chamber and a spring chamber, a nozzle tip bridging the casing at the valve chamber end, the nozzle having an outlet orifice and carrying a valve seat in open communication with the outlet oriiice, a valve stem mounted within the valve chamber and movable to and from the valve seat, a valve on the valve stem for closing engagement with the valve seat when the valve stem moves toward the valve seat, the partition having an opening therethrough and the valve stem having a tail guide slidably mounted in the opening, a back plate adjustably mounted in the spring chamber, a coil spring intermediate the back plate and the valve stem tail guide to urge the valve stem toward valve-closing position, an abutment plate on the valve stern, an inlet for uid opening to the valve chamber, a valve guide chamber intermediate the valve seat and the outlet orifice through which iiuid .may pass from the valve seat to the outlet orifice, and a valve guide projecting from said valve and slidable in the valve guide chamber, the valve seat being carried by Ia valve seat member and the valve seat member being removably mounted in the nozzle tip.

2. A nozzle as claimed in claim 1 wherein, the nozzle tip is bored to receive the valve seat member and the valve seat member has a stud projecting concentrically into said bore, the valve seat member having an axial passageway from the valve seat into the stud, ports diverging from the axial passageway and 4opening to the surface of the stud, and channels in said stud communicating with the ports and the outlet orifice. 3. A nozzle comprising, a tubular casing divided by a transverse partition into open-ended valve and spring chambers, a nozzle tip threaded into the open end of the valve chamber and having a bore into the interior end of lthe nozzle tip coaxial with the longitudinal axis of the casing, a valve seat member threaded within the bore :and having a stud projecting into the bore, an outlet orice in the nozzle tip from the exterior of the nozzle tip to said bore and coaxial with said bore, a valve seat at the end of the valve seat member within the valve charnber, a valve guide -chamber in open communication with the valve seat, a central passageway from the valve guide chamber to therstud, ports diverging from the central passageway to the surface of the stud, and channels on the stud in communication with the ports and the outlet oritice, a valve stem mounted within the valve chamber having a valve for seating engagement with the valve seat, a valve guide projecting from the valve into the valve guide chamber forguided movement therein, a tail guide on the valve stem projecting through an opening in the partition and in sliding engagement with the opening, a back plate mounted in the spring chamber for adjustment toward and from the partition, a coil spring inter-posed between the back plate and valve stem tail guide, an abutment plate 4on the valve stem within the valve chamber, and an inlet for uid opening into the valve chamber.

4. A nozzleas claimed in claim 3 wherein, the valve guide is grooved in the direction of its movement in the valve guide chamber to allow flow of uid between the valve guidey and the valve guide chamber Walls.

References Cited in the tile of this patent UNITED STATES PATENTS 1,498,034 6/24 Hesselman 239-533 1,761,122 6/30 Groff 239-533 2,098,487 11/37 Cooper et al. 239-493 2,273,243 2/42 Zanetti 239493 2,625,435 1/53 Larborn 239-533 EVERETT W. KIRBY, Primary Examiner.

Claims

1. A NOZZLE COMPRISING, A TUBULAR CASING DIVIDED BY A TRANSVERSE PARTITION INTO A VALVE CHAMBER AND A SPRING CHAMBER, A NOZZLE TIP BRIDGING THE CASING AT THE VALVE CHAMBER END, THE NOZZLE HAVING AN OUTLET ORIFICE AND CARRYING A VALVE SEAT IN OPEN COMMUNICATION WITH THE OUTLET ORIFICE, A VALVE STEM MOUNTED WITHIN THE VALVE CHAMBER AND MOVABLE TO AND FROM THE VALVE SEAT, A VALVE ON THE VALVE STEM FOR CLOSING ENGAGEMENT WITH THE VALVE SEAT WHEN THE VALVE STEM MOVES TOWARD THE VALVE SEAT, THE PARTITION HAVING AN OPENING THERETHROUGH AND THE VALVE STEM HAVING A TAIL GUIDE SLIDABLY MOUNTED IN THE OPENING, A BACK PLATE ADJUSTABLY MOUNTED IN THE SPRING CHAMBER, A COIL SPRING INTERMEDIATE THE BACK PLATE AND THE VALVE STEM TAIL GUIDE TO URGE THE VALVE STEM TOWARD VALVE-CLOSING POSITION, AN ABUTMENT PLATE ON THE VALVE STEM, AN INLET FOR FLUID OPENING TO THE VALVE CHAMBER, A CALVE GUIDE CHAMBER INTERMEDIATE THE VALVE SEAT AND THE OUTLET ORIFICE THROUGH WHICH FLUID MAY PASS FROM THE VALVE SEAT TO THE OUTLET ORIFICE, AND A VALVE GUIDE PROJECTING FROM SAID VALVE AND SLIDABLE IN THE VALVE GUIDE CHAMBER, THE VALVE SEAT BEING CARRIED BY A VALVE SEAT MEMBER AND THE VALVE SEAT MEMBER BEING REMOVABLY MOUNTED IN THE NOZZLE TIP.