US3394890A - High-pressure spray gun - Google Patents

High-pressure spray gun Download PDF

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Publication number
US3394890A
US3394890A US530715A US53071566A US3394890A US 3394890 A US3394890 A US 3394890A US 530715 A US530715 A US 530715A US 53071566 A US53071566 A US 53071566A US 3394890 A US3394890 A US 3394890A
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US
United States
Prior art keywords
valve
pressure
chamber
fluid
valve member
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US530715A
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English (en)
Inventor
Heinrich Willi
Sprakel Karl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WOMA APPBAU WOLFGANG MAASBERG
Woma-Apparatebau Wolfgang Maasberg & Co G M B H
Original Assignee
WOMA APPBAU WOLFGANG MAASBERG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by WOMA APPBAU WOLFGANG MAASBERG filed Critical WOMA APPBAU WOLFGANG MAASBERG
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Publication of US3394890A publication Critical patent/US3394890A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/01—Spray pistols, discharge devices

Definitions

  • ABSTRACT F THE DISCLSURE A highpressure spray gun having a mutually controlled auxiliary valve and a main valve of larger flow cross-section which forms a differential piston at least partly displaceable under the lluid pressure, the main valve member being biased into a valve-closing position by the spring against which the auxiliary valve member can be shifted by a trigger lever of a piston grip.
  • Our present invention relates to spray devices for highpressure fluid and, more particularly, to a spray gun for the controlled dispensing of high-pressure liquids.
  • valve member In other systems in which the pressure of the fluid is not a factor, the valve member is held against the valve seat only by the spring means such that the sealing force, especially when pressures of up to 350 atmospheres are concerned, must be sufcient to counteract the tendency of the tluid pressure to unseat the valve member. Consequently, the spring forces must be relatively considerable and the effort required to operate the valve by a triggering lever is also great. When smaller spring forces are employed, leakage past the valve results. Furthermore, an accurate dispensing of the spray and the high rate of flow thereof are not possible since practical limits are provided to the crosssection of the valved passage because larger cross-sections require still heavier springs whereas smaller cross-sections result in reduction of throughput.
  • Another object of this invention is to provide an improved spray gun for high-pressure fluids which can be accurately controlled so as to dispense desired quantities of the fluid and which is characterized by a high throughflow capacity.
  • a spray gun which comprises a main valve means with a relatively large throughilow cross-section and an auxiliary valve means having a relatively small throughflow cross-section such that the valve member of the main valve means is at least partially displaced by States Patent O vce the force applied thereto by the lluid.
  • the main valve means includes a reciprocal piston-like main valve member exposed to the fluid pressure and normally biased in the direction of the main-valve seat so as to block the ow of the lluid from a main-valve chamber communicating with the source of such duid; the main valve member forms with an actuating member the auxiliary valve means which is operable by a trigger lever of a piston grip.
  • the auxiliary valve means can include a valve seat formed on the main valve member which, in turn, is provided with a passage extending from this auxiliary valve seat to the outlet of the spray gun and is adapted to receive fluid from an auxiliary valve chamber surrounding the seat upon withdrawal of the auxiliary valve member by the trigger lever of the piston grip.
  • the main valve member forms a differential piston exposed to the uid in both of these chambers so that a reduction in fluid pressure in the auxiliary valve chamber as a consequence of the withdrawal of the auxiliary valve member from its seat will result in the fluid-pressure displacement of the main valve member away from its seat, whereas a blockage of the outflow from the auxiliary valve member will yield a valve-closing displacement of the main valve member and thus a decrease in the throughow of the main valve means.
  • the present invention involves a valve or closure system which is at least partly uidoperated and incorporates a double-valve arrangement in which the movements of a main valve are co-ordinated with that of a controlled valve, the main valve being disposed between the outlet of the spray gun and the connecting means for supplying the high-pressure lluid thereto, while the control valve is disposed between the pistol grip and the connecting means. Furthermore, inasmuch as the differential-piston effect of the main valve member, when the auxiliary valve is closed, is such that an increase in the pressure applied in the valve-closing direction of the main valve member increases with in creasing iluid pressure, any pressure increase results in a iirmer sealing of the main valve.
  • a spray gun which comprises a pistol grip l having a trigger lever 2 fulcrumed at 2a within a downwardly open recess 1a of the pistol-grip barrel 1b.
  • the lever 2 is designed to actuate a valve system generally designated 3 by means of which the flow of fluid to a spray tube 4 is controlled.
  • the tube 4 carries a nozzle 5 which has an adjustable aperture.
  • a connecting fitting 6 is Welded at 6a to the tubular body 1i of the main valve means 7 in alignment with a radial port 11a.
  • the spray gun is provided with a co-operating control or auxiliary valve means 8 responsive to displacement of the trigger lever 2 for controlling the main valve means '7.
  • the main valve means 7 comprises, within the tubular body 11, an annular main valve chamber 9 which is charged with the fluid from the connecting means 6 at substantially the full lluid pressure.
  • the chamber 9 thus communicates with the radial bore 11a and also with a passage 15a formed in the main valve seat 15,
  • the latter is a ring held against the shoulder 11b of the valve housing 11 by the tube 4 whose male threaded portion 4a is screwed into the correspondingly threaded female portion 11C at the left-hand end of the housing 11.
  • Annular seals 16a and 16b are provided respectively between the transverse faces of the male projection 4a and the valve seat 15, and between the periphery of this valve seat and the inner wall of the valve housing 11.
  • the passage 15a in the valve seat 15 is axially in registry with the passage 4b in the tube 4 and supplies the fluid to the outlet nozzle 5.
  • the main-valve housing is subdivided by a partition 17 internally into the pressure chamber 9 and an equalizing chamber 10 axially spaced therefrom but aligned therewith.
  • a main valve member 12 is axially shiftable within the housing 11 and constitutes a differential piston, as will become apparent hereinafter.
  • the valve piston 12 is of tubular configuration and thus has an axially extending bore 13, the piston 12 having a relatively small-diameter portion 12a exposed to fluid pressure within the chamber 9 and a head 12b exposed to Huid pressure within the chamber 10.
  • the cross-section of the main valve member 12 is smaller than the cross-section of the member in the region of the equalizing chamber 10, in which the piston-cross-section corresponds to the cross-section of the equalizing chamber.
  • the valve body 11 is provided with an axially extending channel 14 communicating between a compartment 10a of the equalizing chamber on the right-hand side of the valve piston 12 and the pressure chamber 9.
  • the compartment 10a thus forms the auxiliary valve chamber, as will become apparent hereinafter.
  • the channel 14 opens into a circumferential groove 28 of the forwardly projecting portion 23a of a controlled valve housing 23, this portion 23a being received within the tubular rearward end 11d of the valve housing 11.
  • the annular groove 28 is sealed off from leakage out of the spray gun and from the compartment 10a by a pair of O-ring seals 23b axially spaced on opposite sides of the groove 28 and seated in respective recesses of the forward portion 23a of the control-valve housing 23.
  • the tluid can pass through an annular clearance between the wall of bore 26 and the controlled-valve member 25 slidable therein.
  • the throttle bore ensures that, in an unblocked condition of aperture 22, the pressure in compartment 10a will be less than that in chamber 9.
  • the bore 26 opens into the compartment 10a around the member 25.
  • the head 12b of the valve member 12 is provided with an annular shoulder 12C of substantially identical diameter as that of the equalizing chamber 10 and flanked by a pair of annular double-lift sealing glands 19 adapted to be spread apart by the fluid under pressure to ensure a proper sealing engagement between the piston-like valve member 12 and the inner wall of chamber 10.
  • a radial bore 20 is provided between the internal passage 13 and the chamber 10. Any fluid within this left-hand portion of chamber 10 readily passes through the bore 13 to the nozzle 5 when the valve member 12 is shifted to the left and the development of a vacuum is prevented by the induction of uid into the left-hand side of chamber 10 when the valve member 12 .is displaced to the right.
  • a sealing engagement between the chambers 9 and 10 is ensured by a further annular sealing gland 18 of the double-lip which bears upon the small-diameter portion 12a of the member 12 and the wall of chamber 9.
  • the glands 1S and 19 are retained in respective grooves of the wall of chamber 9 and head of 12b of member 12, respectively, so that undesirable axial movement of member 18 with respect to the housing 11 or of seals 19 with respect to the member 12 will be prevented.
  • the right-hand end of the main valve member 12 is provided with the auxiliary or control valve seat 21 whose aperture 22 has a substantially smaller cross-section than that of bore 13 and co-operates within conically shaped tip ,25a of the axially shftable auxiliary valve member 25 to form the auxiliary valve means.
  • the smaller diameter of aperture 22 ensures that the effective area of the piston 12, exposed to fluid pressure at compartment 10a and with an effete force to the left member greater than the force effective upon the valve member 12 to the right, is a consequence of uid pressure within chamber 9 or even huid-pressure vbackup at the left-hand side of the head 12b in chamber 10.
  • the forward end 12d of valve member 12 is beveled to cooperate within valve seat 15 in a conical fashion, as will be evident from the drawing.
  • the control-valve housing 23 is locked within the housing 12 by a threaded cap 31 which is screwed onto the right-hand end portion 11d of the housing and clamps the shoulder 23b thereagainst.
  • the control-valve housing 23 forms a coupling member for the pistol grip 1 and the housing 11 and is thus provided at 23e with a threaded male formation locked into the forward end of the barrel 1b of the grip.
  • This formation 23C threadedly receives a guide bushing 24 within which the valve member 25 is shiftable, the bushing 24 forming a seat for a double-lip seal surrounding the valve member 25.
  • a guide block 29 is axially shiftable within the recess 1a in the ⁇ barrel 1b of the pistol grip 1 and is formed with a slot 32 through which the trigger lever 2 passes.
  • the lever 2 - is provided with a camming protuberance 33 which Ibears upon the rear wall of the slot 32 to cam the block 29 to the right when the lever 2 is rotated in the counterclockwise sense.
  • the block 29 further is ⁇ atlixed to the auxiliary valve member 25, which is received within a bore 29a of this block, by a setscrew 29b.
  • a spring means 34 is received within an internally threaded bore 1c in the rearward portion of the barrel and bears upon the block 29 to urge it to the left, ie. into valve-closing direction with respect to the auxiliary valve means 28.
  • a guide rod 35 threaded at 35a into the block, 29, passes axially through the area of spring disks 34 and is shiftable within a bushing 36 threaded into the bore 1c Aand forming a seat for the spring means 34.
  • the bushing 36 thus constitutes a pressure screw for prestressing the spring means 34.
  • the right-hand end of screw 36 can extend ⁇ from the barrel 1b and can be provided with a screwdriver slot 36a.
  • a cap 39 can be threaded onto this free end of the screw to serve as a locking means preventing undesired rotation thereof.
  • the nozzle 5, according to a specific feature of this invention, comprises a threaded reduced-diameter portion 4c of the spray tube 4 onto which. can be screwed a cap 40 which clamps the annular shoulder of a replaceable calibrated-bore body 38 against a sealing ring 39. When it is desired to change the spray aperture, substitute bodies 38 may be clamped in place by the cap 40.
  • the effective force in the valve-closing is equal to the product of the pressure P and the difference between the net surface areas A1 and A2 effective in the valve-closing and valve-opening directions, respectively.
  • the area A1 is, of course, proportional to the difference between the overall diameter a of the piston head 12b and the diameter of the aperture 22 of valve seat 21.
  • the effective area A2 in thel opposite direction is proportional to the difference between the outer dimeter of the member 12d and the diameter e of the bore 4b and of the valve seat 15a.
  • the pressure in chamber 9 remains effective while the pressure in compartment 10a falls substantially to zero so that a net force equal to the product of the pressure P and the area A2 is applied to the valve member 12 to shift it to the right, away from the valve seat 15.
  • the fluid supplied via duct 6 can then flow past the seat 15 into the passage 4b and thence is dispensed through the nozzle 5.
  • Additional fluid passes via the channel 14, t'he annular groove 28, the throttle bore 27 and the guide bore 26 into the compartment 10a of equalizing chamber 10. From this chamber the flow of fluid proceeds via the aperture 22 of auxiliary valve seat 21 and the bore 13 to the passage 4b and nozzle 5.
  • the throttle bore 27 is so dimensioned that there is la pressure drop between the pressure in the chambers 9 and 10a during the flow of fluid past the valve seat 15.
  • a high-pressure spray gun for the controlled dispensing of high-pressure fluid, comprising a pistol grip having a flow-control lever; tubular discharge means connected with said pistol grip for dispensing said fluid; main valve means rearwardly of said discharge tube and connectable with a source of said fluid for controlledly supplying same to said tube, said main valve means having a movable main valve member for controlling the flow of fluid through said main valve means; auxiliary valve means operable by said lever for fluid biasing of said main valve member to displace same at least partially under the fluid bias as regulated by said auxiliary valve means; housing means for said main and auxiliary valve means between said grip and said discharging means, said main valve means and said auxiliary valve means being axially aligned between said discharge means and said grip within said housing means, said main valve means comprising a main valve seat coaxial with said main valve member and engageable thereby upon axial movement of said main valve member in a valve-closing direction; said main valve member being constituted as an axially extending piston, said main valve means further
  • auxiliary valve member is an axially extending rod guided in said housing means and passing into said grip, said rod having a conical forward portion insertable into said aperture, said main valve member having a conical forward portion engageable with said main valve seat, said pistol grip being provided with an axially shiftable body engaging said rod, said lever being cammingly engageable with said body, said spray gun further comprising spring means in said pistol grip acting upon said body for urging said rod into engagement with said auxiliary valve seat, and sealing means between said rod and said housing means rearwardly of said other chamber for preventing the escape 0f fluid therefrom.
  • a spray gun as defined in claim 4 wherein said housing means is formed with a guide bushing for said rod and with a guide bore receiving said rod with annular clearance and opening into said other chamber, said throttle means communicating with said clearance.
  • said spring means includes a stack of annular spring disks axially aligned with said valve means and disposed in said grip rearwardly of said body, said body having a rod slidably passing through said disks, said grip being provided with an adjusting screw for axially precompressing said spring means.

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US530715A 1965-11-27 1966-02-28 High-pressure spray gun Expired - Lifetime US3394890A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW40384A DE1264304B (de) 1965-11-27 1965-11-27 Hochdruckspritzpistole

Publications (1)

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US3394890A true US3394890A (en) 1968-07-30

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Application Number Title Priority Date Filing Date
US530715A Expired - Lifetime US3394890A (en) 1965-11-27 1966-02-28 High-pressure spray gun

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US (1) US3394890A (enrdf_load_stackoverflow)
BE (1) BE681289A (enrdf_load_stackoverflow)
DE (1) DE1264304B (enrdf_load_stackoverflow)
GB (1) GB1094498A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700174A (en) * 1971-04-05 1972-10-24 Louis Beck Airless spray gun extension
US3884419A (en) * 1972-07-19 1975-05-20 Geoffray Jean Pierre Blow guns
US4973026A (en) * 1988-08-01 1990-11-27 Saurwein Albert C High pressure water jet cutting nozzle on-off valve
US5117872A (en) * 1991-05-16 1992-06-02 Fluidyne Corporation High-pressure fluid control valve
US5297777A (en) * 1990-12-20 1994-03-29 Jetec Company Instant on-off valve for high-pressure fluids
US5524821A (en) * 1990-12-20 1996-06-11 Jetec Company Method and apparatus for using a high-pressure fluid jet
US5636789A (en) * 1995-05-01 1997-06-10 Nlb Corp Fluid delivery system
US5799688A (en) * 1990-12-20 1998-09-01 Jetec Company Automatic flow control valve
EP3858500A1 (de) * 2020-01-31 2021-08-04 Josef Kränzle GmbH & Co. KG Reinigungspistole

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005040083B8 (de) * 2005-08-24 2014-03-06 WOMA GmbH Spritzpistole für ein Hochdruckfluid

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795391A (en) * 1954-11-24 1957-06-11 Wheaton Brass Works Pilot controlled filling nozzle
US3102555A (en) * 1959-12-11 1963-09-03 Buckeye Iron & Brass Works Floating restrictor for dispensing nozzle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1370513A (fr) * 1962-10-08 1964-08-21 Devilbiss Co Pistolet pulvérisateur à haute pression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795391A (en) * 1954-11-24 1957-06-11 Wheaton Brass Works Pilot controlled filling nozzle
US3102555A (en) * 1959-12-11 1963-09-03 Buckeye Iron & Brass Works Floating restrictor for dispensing nozzle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700174A (en) * 1971-04-05 1972-10-24 Louis Beck Airless spray gun extension
US3884419A (en) * 1972-07-19 1975-05-20 Geoffray Jean Pierre Blow guns
US4973026A (en) * 1988-08-01 1990-11-27 Saurwein Albert C High pressure water jet cutting nozzle on-off valve
US5297777A (en) * 1990-12-20 1994-03-29 Jetec Company Instant on-off valve for high-pressure fluids
US5524821A (en) * 1990-12-20 1996-06-11 Jetec Company Method and apparatus for using a high-pressure fluid jet
US5799688A (en) * 1990-12-20 1998-09-01 Jetec Company Automatic flow control valve
US5117872A (en) * 1991-05-16 1992-06-02 Fluidyne Corporation High-pressure fluid control valve
US5636789A (en) * 1995-05-01 1997-06-10 Nlb Corp Fluid delivery system
EP3858500A1 (de) * 2020-01-31 2021-08-04 Josef Kränzle GmbH & Co. KG Reinigungspistole

Also Published As

Publication number Publication date
DE1264304B (de) 1968-03-21
BE681289A (enrdf_load_stackoverflow) 1966-10-31
GB1094498A (en) 1967-12-13

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