WO1995010362A1 - Spray gun assembly and system for fluent materials - Google Patents
Spray gun assembly and system for fluent materials Download PDFInfo
- Publication number
- WO1995010362A1 WO1995010362A1 PCT/US1994/011768 US9411768W WO9510362A1 WO 1995010362 A1 WO1995010362 A1 WO 1995010362A1 US 9411768 W US9411768 W US 9411768W WO 9510362 A1 WO9510362 A1 WO 9510362A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve element
- inlet
- outlet
- spray
- chamber
- Prior art date
Links
Classifications
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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
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
- B05B1/3093—Recirculation valves, i.e. the valve element opens a passage to the nozzle and simultaneously closes at least partially a return passage the feeding means
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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
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
- B05B1/3026—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being a gate valve, a sliding valve or a cock
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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
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0483—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with gas and liquid jets intersecting in the mixing chamber
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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
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
Definitions
- the present invention relates to spray guns and particularly to spray guns adapted for spraying fluent materials which have a high viscosity and/or a concentration of particulates which may be fibrous and/or abrasive and/or aggregate materials; especially particulate-loaded cement or mortar, such as plaster or conventional stucco or synthetic stucco which is most commonly called exterior insulation finish systems (E.I.F.S.). BACKGROUND ART
- a continuous circulation of liquid serves to maintain the particulate material in suspension within the carrier liquid.
- Merely circulating particulate material in a suspension with a carrier liquid is not, by itself, an answer to all of the problems encountered in spraying high particulate content fluent material.
- a spray apparatus could be convertible between a continuous recirculation device, which maintains particulate material in suspension within the carrier liquid and, in its alternative embodiment, a spray apparatus which provides for direct passage of the fluent material through the apparatus without recirculation.
- the present invention provides a novel spraying apparatus which has improved means affording recirculation of the spray liquid which avoids harmful effects from the presence of fibrous or abrasive particles in the spray liquid.
- the apparatus of the present invention minimizes the opportunity for the particles of the liquid to lodge in the apparatus and interfere with the operation of the spray gun or cause deterioration of the same.
- the present invention provides a spraying apparatus having an improved valve construction which affords continuous circulation of spray liquid through the apparatus both when the apparatus is operating to spray the spray liquid and when the apparatus is operative to interrupt the spray of the spray liquid, and at all positions therebetween.
- the valve of the present invention has a valve element which cooperates with the inlet for the spray material to provide a shearing action between the valve element and the valve chamber which is effective to disintegrate any particulate material which might lodge between the valve element and the chamber, thereby avoiding inadvertent interruption of the spaying operation.
- valve of the present invention provides facile incremental adjustment of the flow through the spray head for spray liquids having a wide variation in particle content, viscosity, and abrasiveness.
- the present invention has been found to be highly effective in minimizing the effects of large particulate containing fluent materials. This is accomplished by providing an opening for the fluent material flow that is divided into partial flows for both spraying and for recirculation, wherein the size of each opening is at least about four times greater than the size of the largest particulate in the fluent material.
- the inlet which is subjected to the valve element causing the partial flow in two directions has an elliptical configuration or generally oval cross section with the longer portion aligned with the direction of displacement of the valve element. This elliptical configuration allows for larger openings without requiring the redesign of the rest of the spray gun.
- valve element is sized to fit in the chamber with a clearance less than the diameter of the smallest particulate in the fluent material.
- valve element be able to terminate the forward spray without difficulty. This is accomplished in the present invention by having the cooperative surfaces of the valve chamber and the valve element at the point where the valve element engages the chamber be sharp edges so that as the valve element is displaced to the closed position, the sharp edges cut or scrape the particulates out of that intersection point to permit effective closure.
- the device can be converted to a non-recirculating spray gun. This is accomplished by providing a valve element that is sized to be positioned in the chamber both as previously positioned and also in the chamber after 180° rotation of the element.
- the valve element on its diametrically opposed side presents a surface blocking flow through the inlet and the outlet in the closed position of the valve and permits flow only through the inlet and through the spray nozzle in the open position of the valve.
- the present invention also provides an improved nozzle with an effective seal that allows improved mixing of the fluent material with the air.
- the nozzle is an improved nozzle with an effective seal that allows improved mixing of the fluent material with the air.
- Fig. 1 is an elevational view of a spray gun embodying flow control apparatus for the spraying liquid in accordance with the present invention, the portions of the gun being broken away to illustrate the valve which is in its closed position;
- Fig. 2 is a fragmentary view of the gun shown in Fig. 1 showing the valve in its fully opened position;
- Fig. 3 is an enlarged view of the valve element with portions broken away to show its construction; embodiment of a valve, the valve being shown in closed position;
- Fig. 5 is a fragmentary view of the gun shown in Fig. 4 with the valve in open position;
- Fig. 6 is an elevational view of the valve element in Fig. 5 with portions broken away and showing the stator component of the gun in broken lines;
- Fig. 7 is a view similar to Fig. 4 of a further embodiment of a spray gun embodying the present invention with the valve in closed position;
- Fig. 8 is a fragmentary view of the apparatus shown in Fig. 7 with the valve in open position; and Fig. 9 is a view of the valve element with portions broken away and showing the movable return outlet in dot-and-dash lines.
- Fig. 10 is a view similar to Fig. 1, but showing the spray gun having modified inlet and outlet fluid ports of elliptical configuration.
- Fig. 11 is an enlarged fragmentary, sectional, elevational view of the gun head shown in Fig. 10, illustrating the elliptical fluid inlet and outlet ports in relation to the
- Fig. 12 is a sectional, bottom plan view taken along the stepped line 12, 12 of Fig. 11 , showing the elliptically shaped inlet and outlet fluid ports with respect to the return valve in an actuated position.
- Fig. 13 is an enlarged side elevational view of a modified spray gun with portions broken away and in section, illustrating details of the modified spray gun.
- Fig. 14 is an enlarged, fragmentary elevational view of the details contained within the dot and dash box of Fig. 13 which is designated Fig. 14.
- Fig. 15 is a bottom sectional plan view taken along the stepped line 15, 15 of
- Fig. 14 showing the elliptical fluid inlet and outlet ports and the equal area relationship of the fluid inlet port to the actuated position of the valve.
- Fig. 16 is an enlarged sectional elevational view taken along the line 16, 16 of Figure 14, showing cross sectional details of the valve and its dimensional designed clearance in its housing to allow fluid only floating of the return valve body.
- Fig. 17 is an enlarged sectional view taken along the line 17, 17 of Figure 14, showing the means by which the return value body cavity is maintained in vertical
- FIGs. 18A-18D are enlarged front elevational views of four interchangeable nozzles that may be used with the spray gun shown in Figure 13.
- Figs. 19A-19D are sectional, elevational views of each of the nozzles shown in
- FIG. 20 is a side elevational view of another modification, illustrating the spray gun of Fig. 13, having been converted to a so-called "dead-end" spray gun utilizing only the fluid inlet port with no return port opening.
- Fig. 21 is an enlarged fragmentary sectional elevational view of the detail contained within the dot and dash box of Fig. 20 and designated as Fig. 21.
- Fig. 22 is a bottom plan sectional view taken along the stepped line 22,22 of
- Fig. 23 is an enlarged transverse sectional elevational view taken along the line
- Fig. 24 is an enlarged transverse sectional elevational view taken along the line
- Fig. 25 is a view similar to Fig. 1 , but showing the spray gun being modified to place the outlet fluid port to the side rather than to the back of the spray gun.
- Fig. 26 is a view of the inlet and outlet ports shown in Fig. 25, disassembled from the spray gun and shown rotated 90°.
- Fig. 1 illustrates a spray gun embodying a flow control valve for the spray fluid
- the gun is designed for dispensing a spray fluid in the form of a liquid aggregate.
- the spray gun 12 has a barrel 13 and a handhold 14.
- a spray nozzle 15 is mounted to discharge the spray fluid in a spray pattern of a selected design.
- the gun nozzle 15 incorporates peripheral air outlets at 17 which are designed to envelop the spray pattern with a discharge of compressed air.
- Compressed air is introduced into the nozzle through an air passage 21 and is controlled by a valve 22 having an operator 23 which is selectively operable to introduce compressed air into an air passage 24 in the barrel leading to an air plenum 25 surrounding the nozzle.
- Actuation of the operator 23 is achieved by trigger 26 pivoted to the barrel at 27 and operable to be pressed toward the handle by either two or four fingers of the operator.
- the foregoing components are standard operating components of a spray gun, and further description thereof is not deemed necessary.
- the gun is designed to accommodate a spray liquid having carrying particulate material having fibrous and/or abrasive components.
- the barrel 13 has an interior axial wall defining an elongated tubular bore forming a valve chamber 35.
- the barrel is provided with a first nipple 31 for the intake of the spray fluid and a second nipple 32 for the discharge of the spray fluid.
- the nipples 31 and 32 are positioned adjoining one another in close parallel relation, each nipple having an axial bore 33 or 34 opening into the axial wall of the valve chamber 35 which extends therebetween.
- the end of the valve chamber proximate the handle 14 is closed, for example by an end wall 36 and is vented as indicated at 37.
- the distal end of the valve chamber is provided with internal threads 38 to receive the nozzle 15 which has a threaded portion passing through the plenum 25 into engagement with the threaded end 38 of the valve chamber.
- the hollow interior 54 of the spray nozzle 15 communicates with the valve chamber 35 at its distal end.
- a shuttle valve element 41 is positioned for axial displacement in the chamber
- the valve element 41 has a hollow body shell 42.
- the outside of the hollow shell 42 has a sliding fit with the interior wall of the chamber 35 and has an opening 43 extending along the length of the bottom of the body so as to allow the hollow interior 44 of the body to communicate with the inner ends of the bores 33 and 34.
- the valve element 41 has a transverse forward partition 51 with a forwarding projecting nose portion 46 which extends into the interior 54 of the nozzle 15 as shown in Fig. 2.
- the valve element 41 has a transverse rear partition 52 and a rearwardly projecting stem 47 which passes through the end wall 36 and terminates in an operator 48 which is threadedly engaged in the stem 47.
- the operator is actuated by the trigger 26 by engaging in a slot within the trigger.
- the trigger is operated to open the valve 22 through the operator 23, it also displaces the valve element 41 to the right.
- the air line to the passage 24 is opened at the same time as the valve element is moved to the right which effects communication between the inlet bore 33 and the hollow interior of the nozzle 15 velocity in the liquid discharged into the interior of the nozzle, thereby avoiding a reduction in velocity which might otherwise cause the particulate material in the flow to settle out and accumulate in the hollow interior 54 of the nozzle 15.
- the cross section of the nose 46 flares smoothly as indicated at 56 into the outer perimeter of the forward partition 51 of the valve
- the hollow interior 44 of the valve merges into the back of the forward partition 51 and the front of the rear partition 52 to provide a smooth flow passage for the rearward flow.
- the flow passages through the bore 33, the interior of the shell and the bore 34 are all of approximately the same flow area and devoid of obstructions which could throttle or otherwise interfere with the recirculating flow therethrough.
- the present design has been found to enable facile adjustment of the flow from maximum forward flow and a pre-set minimum rearward flow at one limit, and "zero" forward flow and maximum rearward flow at the opposite limit. If it is desired to alter the proportion of flow at the fully opened position, the operator 48 may be adjusted relative to the stem 47.
- Displacement of the valve element causes the partition 51 to sweep across the mouth of the bore 33 in the axial wall of the chamber 35.
- the outer perimeter of the partition provides sharp edges on opposite side which cooperate with the sha ⁇ outline of the mouth to provide a shearing action which severs or disintegrates any particulate matter which might tend to lodge between the valve element and the valve chamber wall across the mouth of the bore 33.
- This shearing action is particularly effective when the spray liquid carries fibrous particles, as is the case when the spray liquid is fiber-loaded cement or mortar.
- the clearance between the sharp edge of the partition the sharp outline of the mouth should be less than the thickness of the particulate material carried in the spray liquid.
- Figs. 4, 5 and 6 illustrate an alternative construction which may be desired for use with the liquids having a high tendency to effect precipitation of particular matter.
- Fig. 4 illustrates a modified construction of a gun housing 112 in which the valve chamber 35 of the embodiment of Fig. 1 is modified as shown at 135 to accommodate a longer valve element 141.
- the hollow interior 144 of the valve element 141 is extended axially to the rear towards the handle to accommodate a stator plug 161 slidable within the hollow 144 of the valve element and which is fixed in position within the chamber 135 by a anchoring element 162.
- the stator plug 161 provides a transverse stator surface which is fixedly mounted in registry with the far side of the outlet bore 134, and allows the valve element 141 to be displaced towards the handle without leaving a pocket between the rear partition 152 of the valve element 141 and the rear edge of the port connecting the bore 134 of the outlet nipple with the chamber
- valve element 141 is similar in function and construction to the valve element 41 of the embodiment in Figs. 1-3.
- FIG. 7-9 illustrate another embodiment of the invention which avoids the
- FIG. 7 illustrates a modified construction embodying a valve element 241 similar in configuration and function to the elements 41 and 141.
- a spray gun housing 212 is provided with a fixed inlet nipple 231 having an inlet bore 233 and a movable outlet nipple 232 having an outlet bore 234.
- the movable outlet nipple 232 is mounted on the modified valve element 241 to register with the interior surface of the rear partition 252 of the hollow 244 of the valve element.
- the nipple 232 is removably mounted on the valve element with seals 262 and a set screw (not shown).
- the nipple 232 moves with the valve element 241 as shown in Figs. 7 and 8.
- the contoured surface rear partition 252 is fixed in alignment with the bore 234 to provide a smooth flow passage for the recirculating liquid aggregate.
- the end wall 236 of the valve chamber 235 is provided with a bottom support 263 having an upstanding guide element 264 adapted to engage in a guideway 265 in the handle end of the valve element.
- the guide 264 and guideway 265 restrict rotation of the valve element 241 as it is actuated between its open and closed positions.
- the element 241 is similar in configuration and function to the valve element 41.
- the hollow interior of the valve element in all three embodiments of the present invention provides a smooth flow passage which is approximately equal in flow area to the flow passages provided through the bores of the inlet and outlet nipples.
- the transverse inner walls of the partitions at the opposite ends of the valve element merge into the interior axial wall of the hollow with a gradual flare as shown.
- valve element avoids any substantial throttling or disruption of the flow of the spray liquid introduced through the inlet nipple, enabling the spray liquid to be pumped to and through the spray gun at the desired flow rate without being substantially affected by opening and closing the valve.
- the guns illustrated in the drawings are suitable for spraying liquid aggregates which have a relatively high viscosity and/or a high particle content.
- the spray liquid flows through the valve chamber and the nozzle without excessive leakage or infiltration of the spray liquid into the operating parts of the gun.
- the clearance between the valve element and the valve chamber wall should be less than the size of the particles, so that when the valve element is at rest, the particles serve to block the flow of the spray aggregate through the clearance spaces in the assembly.
- the confronting edges disintegrate the particles by a shearing action.
- the enlarged clearances facilitate the cleansing of the spray apparatus at the end of the day, when the apparatus is flushed with water or another cleaning liquid.
- Figs. 10-12, inclusive illustrate another embodiment of the present invention generally similar to that shown at Figs. 1-9 described above.
- the elements of this embodiment which are the same as the previously described embodiment bear the same reference numerals. New or modified parts are given new reference numbers in the
- the spray gun generally designated by the numeral 312 includes a barrel or
- the spray gun 312 also includes inlet and outlet fittings communicating with the valve chamber 35 which are externally threaded to attach flexible lines for connection to a fluent material supply source.
- the valve element 41 is generally biased to a closed position by a spring biased trigger 26 whereby fluent material is recirculated in a closed loop including the hollow interior
- valve element 41 which defines a recirculation passageway or chamber.
- the fluent materials including particulates or aggregates of various sizes or fibers require a flow area of a predetermined minimum size in order to prevent so- called plugging in the spray gun and recirculating system by obstructing or closing the flow areas.
- a critical flow area is in the region where the flow of the fluent material at the inlet 33 is split when the valve element 41 is in the open position.
- the inlet and outlet openings 333 and 334 are of non-circular cross section adjacent the valve chamber 35.
- the openings are oval shaped with the major axis A m aligned with the axis A- A of the valve chamber 35.
- the distance D between a transverse plane P-P through the sha ⁇ edge 329 on the front face of the valve element divider 341 is spaced at least about four times the diameter of the largest particulate in the fluent material.
- the back edge of the partition 341 is likewise spaced a predetermined distance D j at least about four times the size of the largest particulate.
- the interaction of the sha ⁇ edge 329 of partition or divider 341 and sha ⁇ edge 328 of valve chamber 35 operate to scrape or dislodge any particulate material and shear any fiber, during actuation of the valve element 41 to a closed position to permit full closing of the valve element 41.
- the non- circular or oval shaped configuration of the inlet and outlet port provides the desired increased flow area in critical flow areas to eliminate the possibility of plugging without requiring an increase in the size of the gun in a width-wise direction. Circular openings of a comparable size increase the dimensions and size of other components of the gun thereby adding weight, decreasing maneuverability and increasing cost of manufacture.
- FIGs. 13-17 inclusive Another embodiment of spray gun in accordance with the present invention.
- the major elements of the gun are generally similar to the previously described embodiments.
- the elements of this embodiment which are the same as the previously described embodiment bear the same reference numerals. New or modified parts are given new reference numbers in the 400 series.
- the spray gun generally designated by the numeral 412 includes a gun head or body 413 and a handle 414 depending from one end of the gun head 413.
- Fluent materials from a fluid supply source 430 are delivered under pressure through line 439 to inlet fitting 431 and inlet port 433 through recirculation chamber 444 in valve element 441 through outlet opening 434.
- valve element 441 When valve element 441 is retracted to an open position to discharge fluent materials by actuating trigger 26 rearwardly toward the handle 26 to position the valve element 441 and parts as shown in Fig. 14,
- valve element 441 has a valve stem 447 a projecting from its rear face 441 R which mounts a pair of adjustable collars 449 and 453 which straddle the trigger 26 in the manner shown in Fig. 13.
- Spacer pin 447 abuts valve stem 447 a and is disposed between the valve stem 447 a and fluid control assembly 448 which has an internal adjustable stop for selectively determining the open position of the valve element 441.
- the collars 453 and 449 are adjustable axially relative to valve stem 447 a and held in a desired orientation by set screws 453 a and 449 a .
- the collar 453 is positioned on valve stem 447 a to abut shoulder 460 when the valve element 441 is in the closed position as shown in Fig. 13. Accordingly, even when the fluent supply system recirculates fluent material, the nozzle 415 can be removed if desired and replaced, for example, with a different nozzle to change spray pattern. As noted the fluent control assembly 448 determines the open limit position for the valve element 441.
- the inlet and outlet openings 433 and 434 are also of non-circular cross section, preferably oval shaped having a major axis A M aligned with the axis A-A of the valve chamber 435 to provide the desired flow area D' and D j ' in the open position of the valve, that is at least about a 4 to 1 ratio to the largest particulate in the fluent material being processed.
- valve element 441 has a planar front axial end face 445 defining a sha ⁇ circumferentially extending edge 429 which cooperates with the sha ⁇ edge 428 of the valve chamber 435 to provide the shearing and dislodging action of fiber and particulate in the fluent material and prevent plugging when the valve is actuated from open to closed positions.
- the radial clearance ⁇ x between the valve element 441 and the valve chamber 435 is preferably smaller than the smallest particulate in the fluent material, preferably not greater than 0.001 inches.
- the diameter of the valve element 441 is about 0.002 inches smaller than the diameter of the valve chamber 435.
- the carrier liquid in the fluent material will function as a lubricant in the interface between the valve element 441 and valve chamber 435 while preventing ingress of the smallest particulate matter in the fluent material.
- the nozzle 415 is characterized by novel features of constructions and arrangement facilitating easy and quick change over when it is desired to vary the spray pattern of the fluent material.
- the nozzle 415 also has a configuration which cooperates with the valve element 441 to ensure a relatively tight sealed relationship between the parts when the valve element 441 is in a closed position.
- the nozzle comprises a body portion 419 having a stepped axial bore 421 extending therethrough having an outer discharge end 42 l a and having an inner end 42 l b the axial end face of the valve element 441.
- the outer peripheral surface 417 of the front end of the nozzle 415 is tapered or of frustro conical shape.
- the rear portion likewise has a tapered outer peripheral surface 418 which complements the shape of the tapered valve seat 420 which it engages in the assembled relation.
- the juncture of the front and back of the nozzle is defined by a radially outwardly directed, circumferentially extending shoulder 422 engagable by a cap 416 which threadedly engages complementary threads on the front end of the gun to seat the nozzle 415.
- the inner end of the bore 421 is beveled as at 425 to define a sha ⁇ circumferentially extending edge 476 abuts the planar end face 445 of the valve element 441 in the closed position as illustrated in Fig. 13.
- An O-ring 473 engaging in a groove in the tapered rear face 418 of the nozzle provides a seal at the interface with
- the tapered valve seat 420 has a peripheral
- Figs. 18Aa - 19D inclusive show various nozzle embodiments in accordance with the present invention facilitating different spray patterns and use with different fluent materials. Accordingly, in the embodiment illustrated in Figs. 18A and 19A, the discharge end 484 of the axial bore 421 is outwardly flared at an included angle of about 45° and is oval shaped in cross section. In the embodiment shown in Figs. 18B and 19B, the discharge end 485 of the bore 421 is likewise outwardly flared at an included angle of about 30° and is oval shaped in cross sections similar to the previously described embodiment.
- the nozzle shown in Figs. 18C and 19C is the same configuration as the nozzle described in connection with Fig. 13 spray gun embodiment of the invention.
- Figs. 18D and 19D does not have the angularly disposed air distribution ports or holes and is adapted for use with cementitious material which are poured rather than sprayed.
- Figs. 20-24, inclusive show another embodiment of the spray gun in accordance with the present invention.
- the elements of this embodiment which are the same as the previously described embodiment bear the same reference numerals. New or modified parts are given new reference numbers in the 500 series.
- This embodiment of spray gun is useful for spraying highly aggregated fiber filled paints and other fluent materials which have a long pot life. In other words these fluent materials do not set or settle out if properly maintained. With these materials there is no need for a continuous recirculating system.
- valve element 541 is simply rotated 180° to present the closed wall 562 of the valve element to the inlet and outlet openings 433 and 434. (See Figs. 20 and 23).
- the valve stem 447 a has a flat 463 on one face thereof and the boss 460 has threaded bores on either side of the opening through which the valve stem 447 a passes so that the set screw 462 can position the valve element 541 in two positions rather easily. Accordingly, as illustrated in Fig. 21 , when the valve is actuated to an open position, all of the fluent material is directed to the axial bore 470 of the nozzle
- Figs. 25 and 26 show still another modified embodiment of the spray gun in accordance with the present invention.
- the elements of this embodiment which are the same as the previously described embodiment bear the same reference numerals. New or modified parts are given new reference numbers in the 600 series.
- the basic elements of the gun including the nozzle 615 are generally similar to that described previously. However in the present instance, there is a novel arrangement of the inlet and outlet ports 633, 634, respectively, to provide a more compact overall design. More specifically, in the present instance, the inlet port 633 and the outlet port 634 are generally aligned in a common plane P-P extending transversely to the axis A-A of the valve chamber 626.
- valve element 641 is significantly smaller in the axial direction. Accordingly, when the valve element 641 is in a closed position (Fig. 25), fluent material entering the inlet 633 passes directly and freely to the outlet port 634 and the gun is in a recirculating mode. When the valve element 641 is displaced rearwardly to an open position positioning front partition 645 of valve element 641
- inlet and outlet ports 633, 634 respectively may be of various cross sectional configurations
- a preferred arrangement is an inlet port 633 of circular cross section and outlet port 634 of oval shaped cross section. Further, in the open position, outlet port 634 is flush with the rearward wall
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94931871A EP0723480A4 (en) | 1993-10-15 | 1994-10-14 | Spray gun assembly and system for fluent materials |
AU80796/94A AU8079694A (en) | 1993-10-15 | 1994-10-14 | Spray gun assembly and system for fluent materials |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/138,473 | 1993-10-15 | ||
US08/138,473 US5370315A (en) | 1993-10-15 | 1993-10-15 | Spray gun for aggregates |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995010362A1 true WO1995010362A1 (en) | 1995-04-20 |
Family
ID=22482170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/011768 WO1995010362A1 (en) | 1993-10-15 | 1994-10-14 | Spray gun assembly and system for fluent materials |
Country Status (5)
Country | Link |
---|---|
US (2) | US5370315A (en) |
EP (1) | EP0723480A4 (en) |
AU (1) | AU8079694A (en) |
CA (1) | CA2174217A1 (en) |
WO (1) | WO1995010362A1 (en) |
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TWI641426B (en) * | 2017-06-05 | 2018-11-21 | 簡道寶 | Spray gun and its air valve |
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US8439281B2 (en) * | 2008-08-15 | 2013-05-14 | Hyde Tools, Inc. | Modular coatings sprayer |
US8225968B2 (en) * | 2009-05-12 | 2012-07-24 | Illinois Tool Works Inc. | Seal system for gear pumps |
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- 1993-10-15 US US08/138,473 patent/US5370315A/en not_active Expired - Lifetime
-
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- 1994-10-14 AU AU80796/94A patent/AU8079694A/en not_active Abandoned
- 1994-10-14 US US08/323,154 patent/US5553788A/en not_active Expired - Fee Related
- 1994-10-14 EP EP94931871A patent/EP0723480A4/en not_active Withdrawn
- 1994-10-14 WO PCT/US1994/011768 patent/WO1995010362A1/en not_active Application Discontinuation
- 1994-10-14 CA CA002174217A patent/CA2174217A1/en not_active Abandoned
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TWI641426B (en) * | 2017-06-05 | 2018-11-21 | 簡道寶 | Spray gun and its air valve |
Also Published As
Publication number | Publication date |
---|---|
AU8079694A (en) | 1995-05-04 |
US5370315A (en) | 1994-12-06 |
EP0723480A4 (en) | 1997-04-02 |
CA2174217A1 (en) | 1995-04-20 |
EP0723480A1 (en) | 1996-07-31 |
US5553788A (en) | 1996-09-10 |
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