Information
-
Patent Grant
-
6378785
-
Patent Number
6,378,785
-
Date Filed
Wednesday, August 30, 200023 years ago
-
Date Issued
Tuesday, April 30, 200222 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 239 318
- 239 394
- 239 242
-
International Classifications
-
Abstract
An aspiration-type sprayer assembly adapted for being coupled to both the end of the hose and to a chemical container has a housing including a carrier liquid inlet passage, a chemical liquid inlet passage and a discharge passage. The cylindrical rotatable valve within the housing has a carrier liquid duct and a chemical liquid duct opening into the carrier duct for interconnecting the inlet passage in a first rotative position of the valve, and the valve is capable of closing the inlet passages in a second rotative position of the valve. The rotatable nozzle versus the discharge in selective directions, and the assembly is capable of being manipulated by the provision of a handle grip. An anti-siphon assembly is provided at the coupling between the sprayer housing and the water hose end to avoid pressure and back flow from the sprayer. And chemical/water mix can be exchanged substituting the various tube retainers having different size inlet ports.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to an aspiration-type dispenser adapted to be connected to a source of pressurized carrier liquid, such as a garden hose, and further adapted to be coupled to a container of chemical liquid to be diluted upon aspiration.
Aspiration-type dispensers of the general type aforedescribed are known, for example, from U.S. Pat. Nos. 5,383,603, 5,320,288 and 5,100,059. In each of these patents a cylindrical valve is disclosed for controlling the flow of the carrier liquid except that aspiration takes place generally downstream thereof thereby requiring an elongated and more complex structure which includes additional ducting and passageways. Also, parts and details required for these known sprayers add to the cost of manufacturing and assembly, which is undesirable. Moreover, the known aspiration-type sprayers are not user friendly and have limited features which have stimulated the need for many improvements.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a sprayer assembly for connection to a container of a liquid chemical to be diluted upon aspiration by a pressurized stream of carrier liquid, which has a minimum number of parts, is compact and economical yet highly efficient in aspirating the chemical liquid in a most convenient and user friendly manner.
Another object of this invention is to provide such an assembly which comprises a housing having a carrier liquid and chemical liquid inlet passages and a discharge passage. A rotatable valve located within the housing has a carrier liquid duct and an intersecting chemical liquid duct interconnecting the inlet passages in a first rotative position of the valve, and the inlet passage is closed by the valve in a second rotative position thereof.
Further object of the present invention is to provide such an assembly wherein the housing has couplings for connection to a source of the carrier liquid and to a container of the liquid chemical, the housing having an integral handle to be grasped by the user for holding the sprayer assembly when spraying, the handle extending outwardly from an upper wall of the housing and having a gripper bar for hand holding.
Another object is to provide such an assembly wherein a diverter is mounted downstream of the discharge end of the housing, the diverter having a wall sloping in one direction lying along the path of the discharge passage for deflecting the liquid flow from the discharge passage to effect a flat spray pattern in that one direction.
Another object is to provide an assembly with such a diverter in the form of a rotatable nozzle having a pair of spaced sloping walls lying in the path of the discharge passage upon nozzle rotation for selectively deflecting the liquid flow in one or another direction.
A still further object of this invention is to provide such a sprayer assembly wherein the housing has a support sleeve coaxial with its chemical inlet opening, a dip tube retainer being coupled to such sleeve, the retainer having a cylindrical wall for suspending the dip tube extending into the chemical container, and the retainer having a transverse wall with an inlet orifice coaxial with the chemical inlet opening, the orifice being of a predetermined size to effect a given chemical liquid-to-carrier liquid ratio.
Another object of the invention is to provide such an assembly wherein carrier liquid inlet and chemical liquid inlet passages extend into a cylindrical bore of the housing and the discharge passage extends from the bore which extends transversely to the passages, the cylindrical valve is rotatable within the bore about its central axis thereof between on and off positions, the valve having annular seal rings at opposite ends in engagement with the bore, and the entirety of the valve being of an injection molded polymeric material wherein the seal rings are of more softer and more compliant material compared to that of the valve material.
A still further object of this invention is to provide such an assembly wherein the coupler for connecting the housing to the liquid carrier source includes an anti-siphon means which permits only one-way flow of carrier liquid in a downstream direction of the housing via through the carrier liquid inlet passage.
Other objects, advantages and novel features of the invention will become more apparently from the following detailed description of the invention when taken into conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a side elevational view of a sprayer assembly according to the invention shown coupled to the end of a hose;
FIG. 2
is a view similar to
FIG. 1
showing a structural detail end section, the valve shown in an open position with the spray diverted upwardly;
FIG. 3
is a view similar to
FIG. 2
, the valve shown in its on position with the spray diverted downwardly;
FIG. 4
is a view similar to
FIG. 2
, the valve shown in its on position with the spray being undiverted;
FIG. 4A
is a cross-sectional view taken substantially along the line
4
—
4
of
FIG. 4
;
FIG. 5
is a view similar to
FIG. 2
showing the valve in a rotative position with the water carrier inlet open and the chemical inlet closed in a rinse position;
FIG. 6
is a view similar to
FIG. 2
with the valve rotated to its off position;
FIG. 7
is an expanded perspective view of an anti-siphon assembly of the invention at the carrier inlet coupler end which is shown assembled together in
FIGS. 2
to
6
;
FIG. 8
is an enlarged perspective view of the cylindrical valve according to the invention in one rotative position;
FIG. 9
is a view similar to
FIG. 8
of the valve shown in another rotative position;
FIG. 10
is a perspective view of the dip tube retainer of the invention; and
FIG. 11
is a perspective view of the diverter nozzle of the invention shown in
FIGS. 2
to
6
.
DETAILED DESCRIPTION OF THE INVENTION
Turning now to the drawings wherein like reference characters refer to like and corresponding parts throughout the several views, the sprayer assembly according to the invention is generally designated
20
, the assembly having a housing
21
coupled to both container C (
FIG. 2
) of liquid chemical, and coupled to a source of pressurized carrier liquid such as via the end of a garden hose
22
which extends from a standard water faucet (not shown).
Applied to one side of the housing indicia is ON, OFF, or RINSE to identify the three positions of the sprayer to be described in more detail hereinafter.
As more clearly shown in
FIG. 2
, the housing has a carrier liquid inlet passage
23
and a chemical liquid inlet passage or opening
24
lying along perpendicular axes and extending into a transverse bore
25
of the housing. A discharge passage
26
extends from the transverse bore of the housing and may be coaxial with or parallel and offset to carrier liquid inlet passage
23
.
Rotatably mounted within the bore is a cylindrical valve
27
shown in perspective in
FIGS. 8 and 9
. The valve has a cylindrical outer wall
28
and may be closed at one end by an end wall
29
. A pair of spring legs
31
, extending outwardly of wall
29
, are adapted to extend through a central opening of a confronting wall
33
of the housing (FIG.
9
), the legs having barbs
32
snapping behind an edge of the central opening to retain the cylindrical valve in place within the housing.
The valve has, as more clearly shown in
FIGS. 2
to
6
, a carrier liquid inlet duct
34
extending along the diameter of the cylindrical valve, and a radially extending chemical liquid duct
35
in open communication with duct
34
. And the cylindrical valve has a turning tab
36
or the like (
FIGS. 8
,
9
) to be grasped by the operator for rotating the valve about its central axis, and an indicator bar
37
or the like extending outwardly of its external wall
28
. Extending through wall
28
of the valve is a vent port
38
which, in one of the open positions of
FIG. 2
, is in alignment with a corresponding vent port
39
provided in the housing.
A dip tube
41
is coupled to the housing and extends into the liquid of container C to be aspirated.
The cylindrical valve is shown in
FIGS. 1
,
2
and
3
in its ON position in that it has been rotated manually into that position as confirmed by indicator
37
lying adjacent the ON marking on the housing. In that position a detent
42
(
FIG. 1
) may be provided on the housing for arresting further counterclockwise rotation of the cylindrical valve from that shown in
FIGS. 1
to
3
.
In the ON position, as clearly shown in
FIG. 2
, the carrier liquid, i.e., water under pressure from the open garden hose, passes through inlet passage
23
and as the liquid stream passes over the inner opening of duct
35
the chemical product is aspirated or drawn from the container up the dip tube and into the carrier liquid stream so as to be thereby diluted as the water and chemical mix is discharged through the assembly via discharge passage
26
.
Referring to
FIG. 6
, valve
27
is shown rotated clockwise until the indicator bar stops at position
37
B shown in
FIG. 1
, at which it abuts against a stop element
43
on the housing in an OFF position. Ducts
34
,
35
are thus rotated completely out of alignment with the passages in the housing such that an elastomeric section
44
on the outer periphery of the cylindrical valve (
FIG. 8
) to be described in more detail hereinafter, overlies carrier liquid inlet passage
23
for sealing the same tightly closed. Also in the
FIG. 6
position, an external seal portion
45
(
FIG. 9
) on the periphery of valve
27
seals tightly over chemical liquid inlet passage
24
.
Referring now to
FIG. 5
, the outer surface of cylindrical wall
28
of the valve is notched as to provide a depression
48
which opens into upstream end
46
of duct
34
(see also FIG.
8
). Similarly, the outer surface of cylindrical wall
28
of the valve is notched to form a depression
49
(
FIG. 9
) which communicates with downstream end
47
of duct
34
when the valve is rotated into its
FIG. 5
position as confirmed by the position
37
A of indicator bar
37
shown in FIG.
1
. The assembly has been rotated into its RINSE position as indicated by the indicia R in FIG.
1
. In such position, seal portion
45
on the outer periphery of the valve overlies chemical liquid inlet passage
24
in tight sealing relationship for sealing it closed. However, duct
34
is in open communication with carrier liquid inlet passage
23
and with discharge passage
26
via their respective depressions
48
and
49
. The assembly may therefore be rinsed for cleansing the assembly prior to attaching a container of another chemical to this assembly if desired. Moreover, the operator can in the rinse R position simply spray or apply a stream of liquid to the plants or grass in the garden without the need to uncouple the assembly from the hose end.
In accordance with another feature of the invention, the sprayer assembly can be conveniently, comfortably and securely held by the hand of the operator during use by the provision of a handle
51
integrally formed with housing
21
and extending upwardly from an upper wall thereof. The handle has a gripper bar
52
which may be contoured on its underside to provide a finger rest indentation
53
and a contour
54
along its lower edge. The gripper bar extends in an upstream direction substantially parallel to the longitudinal axis of housing
21
.
Yet another feature of the invention is the provision of a diverter for deflecting the stream of liquid from the discharge passage in the form of a flat spray dispersed over a wide area. A rotatable nozzle
55
is mounted at the downstream end of the housing, as shown in
FIGS. 1
to
6
and in more detail in FIG.
11
. The nozzle has a pair of spaced apart deflector plates
56
,
57
, and the nozzle when mounted in place has its central axis offset from the axis of discharge passage
26
.
In the manually rotated position of the nozzle shown in
FIGS. 2 and 11
, deflector plate
56
is positioned such that its inner surface
58
is in the path of the liquid flow through the discharge passage such that the liquid is thereby deflected in an upward direction.
On rotation of the nozzle through 180° shown in
FIG. 3
, deflector plate
57
is positioned such that its outer surface
59
lies in the path of the flow of liquid through the discharge passage, thereby diverting the flow in a downward direction as shown. In the
FIG. 3
position, the valve
27
is in the same rotative ON position as in FIG.
2
.
In each of the diverted spray up or spray down positions of
FIGS. 2 and 3
, the stream of liquid flowing through the discharge passage forms flat sprays over a wide area. To enhance the dispersion and to create a spray of bubbles surfaces
58
and
59
may be roughened as shown in some known manner.
In the
FIG. 4
position with the valve likewise in an ON position, rotatable nozzle
55
is rotated such that neither of surfaces
58
or
59
of the deflector plates is in the path of the flow of liquid through discharge passage
26
. The liquid flow is thus not deflected but instead emerges as a stream as shown.
Likewise in the RINSE position of
FIG. 5
, nozzle
55
is shown rotated to the same position as in
FIG. 4
in which neither of surfaces
58
or
59
of the deflector plates is in the path of the discharge passage. Thus in the RINSE position the flow of liquid emerges as a stream from the discharge passage.
It can be seen that in the ON positions of
FIGS. 2
,
3
and
4
, vent ports
38
and
39
are aligned for venting the interior of the container to atmosphere via the open end of the cylindrical valve as shown in FIG.
4
A. However, in the RINSE position of FIG.
5
and in the OFF position of
FIG. 6
, vent port
38
in the valve and vent port
39
in the housing are misaligned to thereby close the vent path to avoid leakage of chemical from the container in the OFF position if the assembly is placed on its side.
When spraying chemicals in the lawn or garden, such as pesticides and the like, the concern arises that chemical could be drawn into the water supply which is not only undesirable but potentially hazardous. To avoid this potential problem an anti-siphon assembly generally designated
61
in
FIG. 7
has been devised. Referring to
FIGS. 2
to
6
, housing
21
is coupled to hose end
22
(
FIG. 1
) by the provision of the standard internally threaded coupler
62
having an inwardly directed flange
63
in engagement with an external snap bead
64
at the distal end of conduit
65
which together with the inlet port leading into the bore
25
of the housing, defines the carrier liquid inlet passage. Assembly
61
includes a valve disc
66
, which may be of elastomeric material, the disc having a central cruciform opening
67
which defines a one-way valve therethrough. The assembly further comprises a flow regulator
68
having a plurality of carrier liquid inlet openings
69
in a circular array, the diameter of the circle exceeding the size of the opening
67
such that the opening abuts against an imperforate inner portion
71
of the regulator. A standard hose washer
72
is located upstream of the flow regulator, and a cylindrical seal
73
is mounted within conduit
65
on the downstream side of valve disc
66
. Seal
73
is resilient and has a seal ring
74
in sealing engagement with valve disc at a diametral location outwardly of openings
69
.
Cylindrical seal
73
at its upstream face has a plurality of notches
75
opening into cutout sections
76
located in the outer surface of the cylindrical seal.
In operation, the carrier liquid through hose
22
inlets openings
69
, expanding the central portion of disc valve
66
permitting downstream flow through inner sleeve
77
of seal
73
. Any flow in an upstream direction is blocked as the central valve area of disc
66
seats tightly against imperforate center section
71
of flow regulator
68
. Also upon creation of any back pressure the same is relieved through notches
75
of cylindrical seal
73
and escapes in a downstream direction via cutouts
76
and through a relief hole
80
provided in the housing
21
(see FIG.
3
).
Housing
21
is likewise coupled to liquid chemical container C via a standard internally threaded coupling
78
as an inner flange thereof engages a groove in end collar
79
of the housing. Disc seal
81
is disposed between collar
79
and the upper end of the container neck. The seal may have a non-circular central opening, such as rectangular, surrounding sleeve
82
which depends from housing
21
in coaxial alignment with liquid inlet passage
24
. The non-circular opening in disc seal
81
thereby defines a plurality of openings establishing communication between vent ports
38
,
39
and the interior of the container.
It is desirable to provide, unlike that found in the prior art, for a variety of chemical/water ratios depending on the garden/lawn conditions to be treated. A higher chemical-to-water ratio may be more desirable for treatment during different times of the year compared to a lower chemical-to-water ratio. Such a mix is made possible by the invention by the provision of a dip tube retainer
83
shown in each of the drawing
FIGS. 2
to
6
and in more detail in FIG.
10
. The dip tube retainer is in the form of an elongated cylinder
84
telescoped within sleeve
82
, and has a spaced outer sleeve
85
at the lower end of the cylinder which defines an annular groove in which the lower end of sleeve
82
is received for snugly and tightly securing the tube retainer to sleeve
82
of the housing.
Cylinder
84
of the tube retainer has an upper end wall
86
containing an inlet port
87
coaxial with inlet passage
24
. Thus in an open position of the valve the chemical is aspirated up the dip tube and into the liquid carrier stream via inlet ports
87
and
24
and duct
35
. A given chemical-to-water ratio can be determined by the size of inlet port
87
in the inner wall of the dip tube retainer. For a smaller chemical/water ratio a dip tube retainer having a smaller diameter inlet port
87
will be made available giving instruction to the user to simply replace one for the other. Of course should a larger chemical/water ratio is desired, a dip tube retainer having a larger diameter inlet port
87
will be made available to the user with instructions to replace that tube retainer.
Valve
27
is co-injection molded whereby a first material of relatively hard plastic forms the basic valve which includes its cylindrical outer wall, closed end wall, spring legs
31
, turning tab
36
and indicator bar
37
. Annular seal rings
88
,
89
are formed adjacent opposite ends of cylindrical outer wall
28
of the valve for sealing engagement with the confronting wall of bore
25
of the housing. And, seal portions
44
and
45
of the outer periphery of the valve wall, together with seal rings
88
and
89
are formed of a slightly softer plastic material compared to that of the end portion of the valve during the co-injection process. Channels
91
and
92
are formed in the outer periphery of the valve cylindrical wall for connecting seals
88
,
89
, seal portion
44
and seal portion
45
together. Thus during the co-injection process, the seals and connecting channels are formed of soft-plastic material utilizing a known co-injection process for this purpose. This avoids the time consuming and relatively more costly process of formulating cylindrical valves such as this with end seals and the like requiring use of a different material utilizing a separate process and requiring a sub-assembly process.
From the foregoing, it can be seen that a hose end trigger sprayer has been devised with a variety of distinctive features which simplify the operation, molding and assembly rendering the assembly according to the invention economical and easy to use yet highly efficient for outdoor garden and yard spray. The sprayer housing is easily handled by the operator by simply grasping the single handle bar thereby avoiding contact with the chemical/liquid mix being discharged. The manually rotatable nozzle diverts the spray forming a flat spray pattern upwardly or downwardly without the need for changing the attitude of the end held assembly. The nozzle likewise facilitates a rinsing of the control valve which permits a stream discharge with no flat pattern.
The replaceable dip tube retainer facilitates changing the chemical/water mix depending on the needs of the user. And the anti-siphon assembly provides for a unique and simple solution to prevent flow of chemical into the water system and to avoid the creation of any back pressure problems during operation. Moreover the cylindrical valve may be produced by co-injection of different materials, one of which is softer for providing integral seal rings adjacent opposing ends of the valve.
Obviously, many modifications and variations of the present invention are made possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
Claims
- 1. A sprayer assembly for connection to a container of a liquid chemical to be diluted upon aspiration by a pressurized stream of carrier liquid, comprising: a housing having a carrier liquid inlet passage, a chemical liquid inlet passage and a discharge passage; a valve mounted within said housing having means for interconnecting said inlet passages in a first rotative position of the valve, said means comprising a carrier liquid duct and a chemical liquid duct both integrally formed in said valve and opening into said carrier liquid duct, said valve being manually rotatable about an axis perpendicular to both said carrier liquid duct and said chemical liquid duct, and said valve having means for closing the inlet passages in a second rotative position of the valve.
- 2. The sprayer assembly according to claim 1, wherein said valve comprises a cylinder rotatable about an axis transverse to axes of said passages, said cylinder being mounted within a cylindrical bore of said housing.
- 3. The sprayer assembly according to claim 2, wherein said closing means comprises an outer surface of said valve in engagement with said bore in said second rotative position.
- 4. The sprayer assembly according to claim 1, wherein said valve has means for interconnecting said carrier liquid inlet passage with said discharge passage in a third rotative rinse position of the valve.
- 5. The sprayer assembly according to claim 4, wherein the housing has a transverse bore in which said valve is mounted, said valve comprising a cylinder, and said means for interconnecting said carrier liquid passage with said discharge passage comprising passageways on an outer surface of said valve in communication with said carrier liquid duct.
- 6. The sprayer assembly according to claim 1, wherein a vent port in said housing communicates with a vent port in said valve in only the first rotative position for communicating the interior of the container with the atmosphere.
- 7. The sprayer assembly according to claim 6, wherein said valve has a cylindrical wall containing said valve vent port, a cylindrical bore in said housing for the reception of said valve, said bore having a wall containing said housing vent port.
- 8. The sprayer assembly according to claim 1, further comprising means on said housing for diverting the flow of liquid from said discharge orifice.
- 9. The sprayer assembly according to claim 8, wherein said diverting means comprises a nozzle having at least one sloping wall for deflecting the liquid flow to effect a flat spray pattern in one direction.
- 10. The sprayer assembly according to claim 9, wherein said sloping wall has a roughened surface for dispersing the deflected liquid.
- 11. The sprayer assembly according to claim 8, wherein said diverting means comprises a rotatable nozzle having a pair of sloping walls for selectively deflecting the liquid flow to effect flat spray patterns respectively in selected directions.
- 12. The sprayer assembly according to claim 11, wherein said sloping walls have roughened surfaces for dispersing the deflected liquid.
- 13. The sprayer assembly according to claim 1, further comprising handle means on said housing for manually supporting the assembly in use.
- 14. The sprayer assembly according to claim 13, wherein said handle means comprises a gripping bar.
- 15. The sprayer assembly according to claim 1, further comprising means on said housing for coupling said carrier liquid inlet passage to a pressurized water source, said coupling means including anti-siphon means for preventing any flow of the carrier liquid toward the water source.
- 16. The sprayer assembly according to claim 15, wherein said anti-siphon means comprises one-way valve means.
- 17. The sprayer assembly according to claim 16, wherein said valve means comprises an elastomeric valve disc and a flow regulator.
- 18. The sprayer assembly according to claim 1, further comprising means connected to said housing for retaining a dip tube extending into the container.
- 19. The sprayer assembly according to claim 18, wherein said retaining means comprises a cylindrical cap having a bottom wall defining an inlet port in communication with said chemical liquid inlet passage.
- 20. The sprayer assembly according to claim 1, wherein said valve comprises a cylinder rotatable within a cylindrical bore of the housing, said cylinder having spaced annular seal rings, and the passages terminating in outwardly opening ports located between said seal rings.
- 21. The sprayer assembly according to claim 20, wherein said valve is entirely of molded polymeric material, the material forming the seal rings being softer and more compliant compared to the material forming the remainder of the valve.
- 22. The sprayer assembly according to claim 1, wherein said housing has a chemical liquid inlet opening and a depending support sleeve 82 coaxial with said opening, a dip tube retainer 83 coupled to said sleeve, said retainer having a cylindrical wall in frictional engagement with said sleeve, said cylindrical wall suspending a dip tube extending into the container, and said retainer having a transverse wall lying adjacent said inlet opening, said transverse wall having an inlet opening in open communication with said dip tube, said orifice having a predetermined size to effect a given chemical liquid-to-carrier liquid ratio.
- 23. A sprayer assembly for connection to a container of a liquid chemical to be diluted upon aspiration by a pressurized stream of carrier liquid, comprising a housing having a discharge passage, means mounted on said housing comprising a rotatable nozzle having a pair of spaced apart sloping walls with opposing sides respectively lying in the path of said passage upon nozzle rotation for diverting flow of the liquid from said discharge passage to effect flat spray patterns respectively in selected directions upon nozzle rotation.
- 24. The sprayer assembly according to claim 23, wherein said walls have roughened surfaces for dispersing the diverted liquid flow.
- 25. The sprayer assembly according to claim 23, wherein said walls are parallel and spaced apart, one of said walls having an outer deflecting surface when lying in said path, and the other of said walls having an inner deflecting surface when lying along said path.
- 26. A sprayer assembly for connection to a container of liquid chemical to be diluted upon aspiration by a pressurized stream of carrier liquid, comprising a housing having a discharge passage through which the carrier liquid is discharged, a nozzle mounted on said housing at said discharge passage for rotation between stream and spray positions, said nozzle having a pair of spaced sloping walls with respective opposing surfaces thereof lying in the path of said discharge passage in different rotative positions to effect spray patterns upon deflection in different directions, said walls lying out of the path of the discharge passage in another rotative position to permit a stream pattern discharge.
- 27. The sprayer assembly according to claim 26, wherein surfaces of said walls lying in said path are roughened for dispersing the spray.
- 28. The sprayer assembly according to claim 26, wherein the nozzle has an axis offset from an axis of the discharge nozzle.
- 29. A sprayer assembly for connection to a container of chemical liquid to be diluted upon aspiration by a pressurized stream of carrier liquid, comprising a housing having carrier liquid and chemical liquid inlet passages extending into a cylindrical bore and a discharge passage extending from said bore, said bore extending transversely to said passages, a cylindrical valve coaxial with and mounted in said bore for rotation about a central axis thereof between on and off positions, said valve having annular seal rings adjacent opposite ends in engagement with said bore, the entirety of said valve being of an injection molded polymeric material, the seal rings being of a co-injected material interconnected by channels provided during co-injection formation, and at least the material forming the seal rings being softer and more compliant compared to the material forming the valve.
- 30. The sprayer assembly according to claim 29, wherein said valve has inlet passage closing means for closing each of said passages in the off position.
- 31. The sprayer assembly according to claim 30, wherein said closing means comprise the softer and more compliant material.
- 32. The sprayer assembly according to claim 31, wherein the closing means are of co-injected material interconnected by channels provided during co-injection formation.
- 33. A spray assembly for connection to a container of chemical liquid to be diluted upon aspiration by a pressurized stream of carrier liquid, comprising a housing having an inlet conduit defining a carrier liquid inlet passage, a coaxial discharge passage, and a perpendicular related chemical liquid inlet passage, means for coupling said inlet conduit to a pressurized water source, said coupling means and said inlet conduit containing an anti-siphon assembly permitting only one way flow of carrier liquid into said carrier liquid inlet passage, said assembly including a cylindrical seal in engagement with a one-way valve disc and having back-pressure relief passages in communication with a relief hole located in the inlet conduit for the relief of any back pressure.
US Referenced Citations (23)