MXPA00004215A - Discharge valve assembly for trigger sprayer - Google Patents

Abstract

A trigger actuated pump sprayer has a discharge valve assembly (54) located in the discharge barrel (41) of the pump body (21). The discharge valve assembly (54) includes an elastomeric valve disc (55) in sealing engagement with the inner wall (56) of the barrel (41). A filler sleeve (61) is located in the barrel (41) to reduce the volume of the discharge barrel thereby displacing the air therein whereupon the strokes-to-prime ratio of the pump required during initial pumping for discharging pressurized liquid along the barrel and through the orifice at a nozzle end thereof, is improved. Also the discharge valve assembly (54) may be shiftable along the length of the discharge barrel in response to pressure and return strokes during pumping, a downstream end of the assembly engaging a spin mechanics element (48) at the nozzle end to therewith define a variable volume suction chamber in communication with the discharge orifice (44) for withdrawing product therefrom during each pumping suction stroke.

Description

ASSEMBLY OF DISCHARGE VALVE FOR SPRAYER WITH TRIGGER This invention relates generally to a discharge valve assembly for a pump-driven sprinkler driven by a trigger and more particularly, to a valve assembly having a characteristic retraction of the product to prevent the formation of droplets and run-off of the liquid product. in the discharge hole when in use. Another feature of the invention is the reduction of the volume of the discharge passage that is directed from the pumping chamber to the discharge orifice to assist in the priming of the pump.

It is known that the sprinklers with trigger-driven pump have certain basic characteristics, namely; a trigger-operated piston that operates in a pump cylinder, an inlet controlled by a valve to the pumping chamber and a discharge direction controlled by a valve in the opposite direction to the chamber. During each return stroke of the piston, the internal pressure of the pump decreases below atmospheric pressure as the volume of the pumping chamber expands to introduce the flow of the liquid product into the chamber of the container through the entry, via a check valve not seated in the inlet. The pumping chamber is therefore charged (or barley) and recharged with liquid product during each suction stroke. And during the induction of the product to the discharge, the check valve moves closed against its valve seat to seal the closed discharge and facilitate the priming of the pump. During each pressure stroke, the product is discharged from the pumping chamber, sealing the closed inlet, as the check valve at the inlet is forced against its valve seat, while applying pressure against the valve Retainer discharges to move it from its valve seat to open the discharge to the hole at the exit end thereof. Examples of known pump sprinklers are: Model No. TS-800 manufactured by Calmar Inc., Patents of E.U.A. RE 33235; 4,527,741; 5,234,166 and 5,509,608.

Frequently, the waste product in the discharge passage which is directed to the outlet opening tends to accumulate in the discharge orifice after closing the discharge valve, thereby forming drops and run-off (dripping of the product) into the discharge port. the hole, which is undesirable.

Typically, a trigger sprinkler is structured such that it has a relatively long discharge cylinder with direction from the pump chamber to the discharge orifice at the nozzle end thereof. The discharge cylinder defines the discharge passage which is formed integrally with the pump body during the molding operation and which is thus sized sufficiently to facilitate molding. However, the diameter and length of the discharge passage provide a volume that is filled with product during the pumping operation and remains substantially full during use. When the pumping chamber is primed, the liquid product is increasingly stored in the pumping chamber during each return stroke and is discharged from the chamber during each pressure stroke in the discharge flow path extending between the outlet from the pumping chamber to the discharge hole. During the blows of the initial pressure, the discharge path is gradually filled with product, this being one of several factors that determine the pumping operation translated as the ratio blows: priming.

It has been found that the reduction of the volume of the discharge passage is a factor that provides an acceptable proportion of blows: priming, since it is required that a smaller volume is occupied by the product during the initial pressure blows, effecting in this way, an initial discharge through the hole.

SUMMARY OF THE INVENTION It is therefore an object of the present invention, provide an improved discharge valve assembly for a sprinkler with a trigger-driven pump that has an anti-drip feature. For this purpose, a suction chamber is defined between a slide valve assembly and a fixed rotating mnical element at the nozzle end of the discharge cylinder, the suction chamber communicates with the discharge orifice. The valve assembly has a reciprocal movement during the pressure and return strokes to not only supply product from the valve to the discharge orifice, but also reciprocally move it in the discharge cylinder to suck product into the discharge orifice to avoid the formation of drops and run-off at that point.

Conversely, the discharge valve assembly can be stationary within the discharge cylinder and a volume reducer is provided in the discharge passage to restrict the accumulation of product in the passage to support pump priming at that point. The volume reducer may be in the form of a jacket or cylinder, or the like. The pump assembly includes a circular elastomer disc valve in sealing engagement along its outer periphery with an inner wall of the discharge cylinder in the closed valve condition, at least a portion of such outer periphery decoupling the inner wall in an open valve condition.

The volume reducer in the discharge passage may likewise be provided for this embodiment of the invention which includes a longitudinally slidable valve assembly provided for removing product into the discharge orifice.

Other objects, advantages and novel features of the invention will be apparent from the following description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a vertical sectional view of a sprinkler with a pump driven by a trigger, incorporating an anti-drip feature and a priming support for the pump according to the invention; Figure 1 A is a partial view similar to that of Figure 1, of a modification of the anti-drip feature and Figures 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11 are views in vertical section similar to that of Figure 1 of the variations of both embodiments of the invention.

DETAILED DESCRIPTION OF THE INVENTION Turning now to the drawings, wherein the reference characters are related to the corresponding parts through several views, a manually operated pump dispenser incorporating the invention is designated generally by the number 20 in Fig. 1, comprising a pump body 21 adapted to be mounted to the neck of a container 22 of the liquid product to be dispensed, using an internally threaded closure cap 23. By contrast, a snap closure (not shown) could be provided for mounting the body pump or container, or the pump body could be mounted to the neck of the container using a bayonet arrangement (not shown).

The pump body includes an inlet passage 24 defined by a cylindrical edge portion 25 of the pump body suspending a conventional seal tube 26 immersed at its free end in a liquid product (not shown) within the container, the tube The seal is suspended by friction-tight coupling with the inner wall of the portion 25. On the contrary, the sealing tube can be suspended from the portion 25 in any known manner.

Also, the pump body includes a pump cylinder 27 for receiving a manually reciprocable pump piston 28 having a ring annular piston seal 29 defining together with the pump cylinder, a variable volume pumping chamber 31. A spherical check valve 30 at the inlet or the like is provided to valvulate the inlet in any known manner. A piston return spring 32 is provided, which may be inside the pump chamber as shown or may be external to the pump chamber (not shown), to return the piston to its position in Fig. 1 , after each pressure stroke. A trigger actuator 33 is pivotally mounted on the pump body, the trigger has a projection 34 engaging an outer edge of the piston for reciprocal movement of the piston after each pull of the trigger against the force of the return spring 32. In the same way, the piston may have an annular vent seal off-side 35 in sealing engagement with the inner wall of the pump cylinder off-side of one or some longitudinal flanges 36 on the inner wall to break the seal during the reciprocal movement of the piston to open the ventilation port 37 to the atmosphere and ventilate the interior of the container. See RE33.235 for a detailed description of the trigger sprinkler described above.

The cylindrical portion 25 has a port 38 through which the liquid product enters and leaves the pumping chamber, the port communicates via an opening 39 with a substantially horizontal discharge cylinder 41, through which the liquid product passes. , the terminal end of the cylinder 41 defines a nozzle 42. A nozzle cap 43 has a discharge hole 44 provided in its front wall 45, arranged as a closing spring 46 of the nozzle 42 for rotation without axial movement between the positions of off and on. The lid has an inner cylindrical sleeve 47 with longitudinal internal passages, the sleeve surrounding a mechanical rotation member 48 mounted on the nozzle 42, the element 48 has separate loops 49 circumferentially spaced, one of which engages with a locking lever. 51 to slam the connection element 48 in place against rotation. A stop bracket 50 or the like, may be provided inside the cylinder for mounting the mechanical rotating element against axial movement.

The front wall of the element 48 defines a turning chamber 52 having a plurality of radial and tangential grooves extending between the chamber and the longitudinal grooves provided in the outer wall of the element 48. After rotation of the nozzle cover 43, the internal recesses in the sleeve 47 and the external slits on the same or different element 48 to open or close the discharge orifice, all of the foregoing is described in detail in the 4,706,888 patent, the full description thereof is incorporated herein as reference. And the pump body may be covered with a reinforcing ring 53 closed or mounted in a normal manner.

A discharge valve assembly 54 is located within the cylinder 41, the assembly includes a circular elastomeric disc valve 55 in sealing engagement along its outer periphery with the inner wall 56 of the cylinder 41. The valve may be frusto- Conical as shown, it has an outer diameter slightly larger than the inner diameter of the wall 56 to inherently provide a slanting action of the valve against the wall 56. The conical valve is sometimes referred to as a goat valve.

The assembly 54 is disposed within the discharge cylinder 41 for longitudinally moving movement along the same, the assembly further includes support means for the valve and the mechanical turning element which may be in the form of an elongated cylindrical rod. that with valve 55 can be integrally molded.

The mechanical turning element 58 has a central cylindrical depression 58 (Fig. 1 A), which is therefore slightly oversized in relation to the size of the diameter of the rod 57, or it may have one or more longitudinal slits formed in its inner wall. . The downstream end of the rod 57 extends into a depression 58 and at that point defines a variable volume suction chamber 59 in open communication with the hole 44 in the open rotary discharge position of the nozzle cover.

A hollow sleeve 61 can surround the rod 57, the internal diameter of the sleeve is slightly larger than the diameter of the rod 57 to define an annular discharge passage 62. The sleeve 61 functions as a means of reducing the volume of the cylinder. download 41 for a specific purpose that will be more fully explained later. And one or more longitudinal flanges 63 or the like, which can be provided on the rod 57 adjacent to the valve 55, the flanges acting as spacers of the sleeve 61 to maintain the axially spaced sleeve of the valve to avoid any interference during opening. valve.

In operation, assuming that the pumping chamber 31 is primed with liquid product, each internal (pressure) stroke applied to the piston after each pull of the trigger; increases the pressure of the liquid on the upstream side of the valve 55, causing at least a portion of the periphery of the valve to disengage from the inner wall 56 to open the discharge allowing the liquid under pressure to flow through the passage 62 and outside and through the orifice 44 as a spray or a current depending on the manual arrangement of the nozzle cover 43. The pressurized product of the pump chamber acts against the upstream face of the valve 55 which likewise , causes the complete valve assembly 54 to longitudinally adjust to a downstream direction, wherein the rod 57 moves reciprocally in the depression 58, near the evacuation chamber 59 of any fluid. After the relaxation of the manual force applied against the trigger, the piston of the pump deviates towards the outside of its inner cylinder surface, under the influence of the force of the return spring 32 in any normal manner, for there to expand the pumping chamber 31 which functions to supply liquid above the sealing tube and into the pumping chamber via the non-seated spherical check valve 30 and port 38. This sub-atmospheric pressure created by the expanding pumping chamber, originates in the same way; that the valve 55 is hermetically sealed against the inner wall 56 due to the difference in pressure existing on the opposite sides of the valve. The closure of the discharge valve allows the pumping chamber to be primed in the manner described above. And the sub-atmospheric pressure created on the upstream side of the valve 55 causes the rod 57 to move reciprocally upstream in an upward direction of the chamber 59 to create a sub-atmospheric pressure condition to suck any residual product from the orifice 44 to prevent the formation of drops and run-off.

During each pressure stroke of the piston, the product flows in and through the discharge cylinder portion 41, before discharging out of the orifice in the form of a spray or current. Depending on the arrangement of the discharge nozzle. Without the inclusion of the jacket 61, the volume of the cylinder 41 is significantly larger and its volume is initially filled with air before the pump is primed, so that the liquid product displaces the air gradually during each initial pressure stroke. The ratio blows: priming experienced during pumping or without the provision of a volume reducer, has been shown to be higher than acceptable.

The provision of the jacket 61, surrounding the connecting rod 57, significantly reduces the volume of the discharge cylinder 41 and defines a thin annular discharge passage 62, jointly with the connecting rod. The sleeve 62 functions as a priming support that displaces the air in the cylinder 41, so that a reduced volume of air must initially be displaced by the liquid product, as it passes through the discharge during pressure shocks. initial. It has been shown that with the provision of the volume reducer, the blow: priming ratio is reduced to a more acceptable level.

As mentioned above, during each piston return stroke, the valve assembly retracts, as it deflects slightly backward in an upstream direction and expands the suction chamber 59. The expanding chamber, being in open communication with the discharge orifice 44, it works by retracting the product in and back from the orifice that can be collected out of the orifice in the form of droplets or product run-off, thereby providing an anti-drip effect.

A light spring 64 of some type, shown in Fig. 1A, can be provided in the suction chamber 59 between the bottom wall of the chamber and the front part of the rod 57, to support the retraction of the valve assembly. of discharge to cause its deflection out of chamber 59 during each return stroke of the piston. The spring 64 may be in the form of a coil spring, flexible leaf spring, or any light spring equivalent, without departing from the spirit of the invention.

Figs. 2 to 11 show various modifications of the discharge valve assembly according to the invention. For example, the discharge valve assembly 65 of FIG. 2 is similar to the valve assembly 54 of FIG. 1 since both include the rod 57, having an integrally molded conical disc valve 55, which is a spring deflected under its own elasticity along its periphery having against the inner wall 56 of the cylinder 41. And the valve assembly 65 is longitudinally movable with the cylindrical depression 58 of the mechanical rotating member 48 to define the suction chamber of variable volume 59 as described in detail with reference to Fig. 1.

A hollow sleeve 61 circumscribes the rod 57 and defines an annular discharge passage 62 through which the liquid product under pressure passes during pumping and applies pressure against the upstream side of the valve 55 to deform the valve in a open position and deflect the downstream valve assembly, causing the tip of the rod to move reciprocally within chamber 59. Valve assembly 65 and volume reducer 61 operate in the same manner as described with reference to Fig. 1. As seen in Fig. 2, the main difference between the valve assembly 54 and the valve assembly 65 is that in the last disc valve it is further located downstream in the cylinder 41, compared to the upstream location. of disk 55 in Fig. 1.

The discharge valve assembly 66 in the embodiment of FIG. 3 comprises a combined filler in the form of a tubular portion 67 integral with the mechanical rotation member 48., which is, on the contrary, identical to that described with reference to Fig. 1. The assembly 66 is fixed within a cylindrical portion 41, with one of its handles 49 arranged in a closed manner for the locking lever 51. And the assembly can include a separate valve element 68, on which the conical valve 55 is formed, the valve is seated along its outer periphery against the inner wall 56 to close the discharge passage 62 formed between the outer diameter of the tubular portion 67 and the inner diameter of the cylindrical portion 41. The valve member 68 can be simply leveled at the open end of the portion 67 with frictional engagement with the wall in the inner diameter thereof.

The discharge valve assembly 69 of the embodiment of Fig. 4 comprises a hollow tubular section 71 fixed within the discharge cylinder 41, by frictional engagement with a pin 72 provided in the pump body 21, the valve assembly The discharge further includes an integral portion of connecting rod 73 fixed to a mechanical rotating member 48 separated after engagement by friction, with the wall of the depression 58 thereof. The conical disc valve 55 can be formed integrally with the connecting rod portion 73 shown, seated and located as its seals at the outer periphery against the inner wall 56 of the portion 41. The discharge passage 62 is established between the outer diameter of section 71 and the inner diameter of the cylinder 41, such that the liquid product under pressure passing therethrough, is held against the upstream side of the disk valve 55, causing it to deform at least one portion thereof to move it from its valve seat to open the discharge to the discharge orifice.

In the embodiment of Fig. 5, the discharge valve assembly 74 is shown as the discharge valve assemblies 54 and 65 of Figs. 1 and 2, mounted on the discharge cylinder 41 for longitudinal deflection movement to provide a similar anti-drip feature. The assembly includes a connecting rod 57 engageable with the wall of the cylindrical depression 58 of the mechanical rotation member 48 to define a variable volume suction chamber 59 for effecting retraction of the product in the discharge orifice in the manner and for the purpose described. with reference to Fig. 1. The rod 57 has at its upstream end an integral conical valve 55 which, as in the above embodiments, has its outer peripheral edge in sealing engagement with the inner wall 56 of portion 41 to close the discharge passage 62. Also the valve assembly 74 includes along the length of its connecting rod 57, a plurality of circular integral disks 75 or the like, which function as a filler to reduce the volume in the cylinder 41 to function the same or similar shape, as the filling elements 61, 71 and 61 described above. The discharge valve assembly 74 is biased to a downstream direction during each pressure stroke that delivers product under pressure against the upstream side of the disk valve 55 deforming at least a portion of said disk to open the discharge passage 62 and similarly, effect a longitudinal deflection of the assembly within the barrel 41 to provide an anti-drip feature. The valve assembly retracts during each suction stroke of the piston, as the pressure on the upstream side of the disc valve 55 is less than atmospheric relative to the pressure on the downstream side thereof, to retract the rod 57 outside the cylindrical depression 58. As in the embodiment of Fig. 1, a light return spring 64 of some selected type can be provided to support the retraction process of the valve assembly.

The discharge valve assembly 76 of the embodiment of Fig. 6 includes a hollow tubular section 77 in frictional engagement with the mechanical rotation member 48, so that it is fixed in the discharge cylinder 41. A disc valve Discharge 78, of elastomeric flexible material, deforms when assembled within the cylinder 41, such that it assumes a concave shape as shown, which possesses an inherent deflection capability as its outer peripheral edge engages to seal against its inner wall 56 of the cylinder 41 for valveing the discharge passage 62. The disk valve can be mounted on site, by the provision of a central opening 79, through which a bolt 81 extends over the pump body. The section 77 may engage the bolt as shown, or the bolt may be provided in the section 77 and extend through the central opening 79 of the disk valve to stabilize the same within the cylinder 41.

The discharge valve assembly 82 of the embodiment of FIG. 7 is fixed within the cylinder 41 as a handle 49 in the mechanical rotation member 48 and engages the locking lever 51. The assembly includes a downstream tubular section. formed integrally with the element 48 and an upstream sleeve 84 fixed in place, by frictional engagement with the pin 72. A valve member 85 having a conical discharge valve 55, interconnects the section 83 and the tailor-made sleeve 84 which frictionally engages the hollow inner ends thereof, as shown. The discharge passage sections 62 are established between the inner diameter of the cylinder 41 and the outer diameters of the jacket 84 and the tubular section 83, respectively. As shown, the conical valve 55 is in a substantially intermediate position between the upstream and downstream ends of the cylinder 41, compared to the positions of the discharge valves of the preceding embodiments. The valve 55 operates in a manner similar to that described above with respect to the valvulation of the product through the discharge passage and the elements 83, 84 of the discharge valve assembly function as filling elements to reduce the volume of the cylinder 41 for the purpose and in the manner described with reference to Fig. 1.

In the embodiment of Fig. 8, the discharge valve assembly 86 includes a filling element in the form of a tubular section 87 fixed within the portion 41, as it is frictionally engaged with the pin 72. The Discharge disc 78, which may be of the same type or similar to that described with reference to Fig. 6, is mounted via its central opening in bolt 81 at the downstream end of section 87. And the valve assembly includes a expander 88 which engages with bolt 81 and cylindrical depression 58 of the mechanical rotating element.

The discharge valve assembly 89 of FIG. 9 includes a hollow sleeve 91 fixed to the pin 72 and functions as a filling element, the sleeve defining together with the inner wall of the cylinder 41, a discharge passage 62. The element valve 92 interconnects the mechanical rotation element 48 with the jacket 91 via friction coupling, as shown. The conical valve element 55 is formed in the element 92 which functions to valvulate the product through the discharge passage, in a manner similar to that described with reference to the other embodiments.

The discharge valve assembly 93 in FIG. 10 comprises a tubular element 94 fixed in the cylindrical portion 41 and connected to the mechanical rotation member 48 by friction coupling, as shown. The assembly further has a valve member 96 to which, the conical valve 55 is integrally molded, the valve member being fixed to the tubular member 94 after frictional engagement. The element 94 defines an annular discharge passage 62 together with the inner wall 56 and the valve 55 is seated against the wall 56 with respect to its outer annular edge. The element 94 functions as a filler to reduce the volume of the cylindrical portion 41 for the purpose and operation in the manner described with reference to Fig. 1.

Finally, the embodiment of Fig. 11 has a discharge valve assembly 96 that includes the filling element formed as a molded cylinder 97 fixed to the pin 72 at its upstream end and being supported against the valve member 98 that it extends for frictional engagement with the mechanical rotation member 48. The valve member includes a conical discharge valve 55 which, as in all other embodiments, is seated along the outer periphery against the inner wall 56 for valve the discharge passage 62 which is defined between the cylinder 97 and the wall 56.

From the foregoing, it can be noted that a large variety of discharge valve assemblies have been provided for a sprinkler with a trigger-driven pump, each having one; a filler for reducing the volume of the discharge cylinder, which displaces a substantial volume of air, in such a way that the product is discharged through the discharge cylinder; more quickly towards the exit orifice of the discharge during the pressure shocks of the initial pumping. The blow-up ratio: priming for the pump, is therefore, improved by a simple measure that may require a separate sleeve-similar to a filler or a cylindrical section of the discharge valve assembly that can take a wide variety of forms. The discharge valve may be in the form of a conical valve or a disk valve configured with a concave face after assembly, being seated along its outer periphery against and confronting the inner wall of the discharge cylinder. The valve can be located in several positions along the length of the cylinder.

In addition to the improvement of the blow: priming ratio, the discharge valve assemblies according to the various embodiments of the invention, can be deflected in an axial direction along the length of the discharge cylinder, so that a connecting rod or The portion of the connecting rod as part of the valve assembly slides within a cup-shaped depression of the mechanical rotation element to define a variable volume suction chamber. Said chamber is in fluid communication with the discharge orifice by means of it, supplying or retracting product from and around the discharge orifice to prevent the formation of drops of the product. Such an anti-drip feature does not require additional parts and is a simple and effective means to prevent the formation of droplets and run-off of any product in the discharge orifice. Of course, the anti-drip feature can be provided independently of a discharge volume reducer, without departing from the spirit of the invention.

Obviously, many other modifications and variations of the present invention are possible in light of the above demonstrations. It should be understood, therefore, that within the scope of the appended claims; the invention can be applied differently to the one specifically described.

Claims (28)

1. A sprinkler with a trigger-driven pump comprising a pump body having a cylindrical discharge cylinder in communication with a variable volume pumping chamber defined by a reciprocating piston, operating manually between pressure and return strokes in a pump cylinder of said body for discharging liquid product through a discharge orifice at a downstream end of said cylinder, a mechanical turning element fixed at said downstream end, a discharge valve assembly including a circular elastomeric disc valve in engagement sealing along its outer periphery with an inner wall of said cylinder, in a closed valve condition during the return strokes of the piston, in at least a portion of said outer periphery decoupling said inner wall in an open valve condition during the piston pressure shocks, said valve assembly being slid along said passage in response to the pressure and return blows and having means to engage said element at that point to define a variable volume suction chamber during the sliding movement to retract the liquid product into said orifice of discharge to avoid the formation of drops and run-off.
2. The pump sprinkler according to claim 1, further comprising a filling member disposed within said discharge cylinder to substantially reduce the volume thereof and define a discharge passage in communication with said orifice to reduce the volume of liquid product inside said cylinder during the pumping operation.
3. The pump sprinkler according to claim 1, wherein said means of said valve assembly comprises a sliding rod within a cup-shaped depression in said element for defining said suction chamber.
4. The pump sprinkler according to claim 3, wherein the spring means are provided in said suction chamber to deflect said rod from said elements.
5. The pump sprinkler according to claim 1, wherein said discharge valve is located at an upstream end of said cylinder.
6. The pump sprinkler according to claim 2, wherein said discharge valve is located at an upstream end of said passage, said means in said valve assembly comprise a connecting rod and said filling member comprises a sleeve surrounding said connecting rod and defining at that point, said discharge path.
7. The pump sprinkler according to claim 6, wherein means are provided in said rod to axially separate said liner from said valve to avoid interference in the open valve condition.
8. The pump sprinkler according to claim 1, wherein said discharge valve is adjacent said downstream end of said cylinder.
9. 9. The pump sprinkler according to claim 2, wherein said discharge valve is adjacent said downstream end of said passage, said means of said valve assembly comprise a connecting rod and said filling member comprises a sleeve surrounding said connecting rod and defining at that point, said discharge passage.
10. 10. The pump sprinkler according to claim 9, wherein said connecting rod extends to an upstream end of said passage.
11. 11. The pump sprinkler according to claim 5, wherein said means of said valve assembly comprises an elongated member having an enlarged section for substantially filling said cylinder to reduce the volume of liquid product in said cylinder during the pumping operation.
12. 12. The pump sprinkler according to claim 1, wherein said valve comprises a conical valve that pours the liquid in a downstream direction.
13. 13. The pump sprinkler according to claim 1, wherein said valve faces a concave side in an upstream direction.
14. A discharge valve assembly adapted for use in a trigger-driven pump sprinkler, to be mounted in a liquid container, the sprinkler has a pump body that includes a discharge cylinder and a pump to discharge the liquid product from the container to Through the cylinder and from a discharge orifice at a downstream end of the cylinder, the valve assembly comprises a flexible valve disk of larger diameter than the diameter of said cylinder for elastically coupling the inner wall of said cylinder to a position of closed valve and to uncouple said inner wall in an open valve position, said assembly further comprises means for defining a mechanical rotating element fixed to said downstream end and supporting means for said mechanical rotating means and said disc valve, said support means extending between an upstream end of said cylinder and said end c Downstream, said support means have means for substantially reducing the volume of said passage and maintaining a discharge passage towards said orifice to reduce the volume of the liquid product in said passage during the pumping operation.
15. The valve assembly according to claim 14, wherein said disk valve is located at said upstream end.
16. The valve assembly according to claim 15, wherein said support means comprises a moving rod along said passage in response to the pressure and suction strokes applied during pumping, said connecting rod engages a cavity in said mechanical means of rotation to define at that point, a variable volume suction chamber during the movement of the connecting rod to retract liquid product from said orifice during the pumping to avoid the formation of drops and run-off.
17. 17. The valve assembly according to claim 14, wherein said volume reduction means comprises a sleeve er surrounding said support means.
18. 18. The valve assembly according to claim 15, wherein said support means comprises a connecting rod and said volume reduction means comprise a hollow tube surrounding said connecting rod.
19. 19. The valve assembly according to claim 14, wherein said disc valve is adjacent said mechanical turning means.
20. 20. The valve assembly according to claim 14, wherein said support means comprises a cylindrical er with which said mechanical means of rotation is integrally formed, said cylindrical er having an outer diameter slightly smaller than the diameter of the cylinder to define said means of volume reduction.
21. 21. The valve assembly according to claim 14, wherein said disc valve comprises a frustoconical valve lip sliding towards said inner wall in a downstream direction.
22. 22. The valve assembly according to claim 14, wherein said support means comprises a cylindrical er coupled to said mechanical means of rotation, said cylindrical er having a diameter size relative to said cylinder to define said volume reduction means.
23. 23. The valve assembly according to claim 22, wherein said disc valve is formed integrally with said cylindrical er.
24. 24. The valve assembly according to claim 14, wherein said support means comprises a connecting rod coupled to said mechanical means of rotation, said connecting rod having an enlarged section defining said volume reduction means.
25. 25. The valve assembly according to claim 16, wherein said connecting rod has an enlarged section defining said volume reduction means.
26. 26. The valve assembly according to claim 14, wherein said disc valve is located between said ends upstream and downstream.
27. 27. The valve assembly according to claim 26, wherein said support means comprises a cylindrical member integrally formed with said mechanical means of rotation.
28. 28. The valve assembly according to claim 14, wherein said support means comprises a cylindrical member to which said disk valve is mounted adjacent to said mechanical means of rotation and an expander for coupling said mechanical means of rotation to said cylindrical member. The valve assembly according to claim 28, wherein said cylindrical member has a diameter sized to the diameter of said inner wall to comprise said volume reduction means. The assembly according to claim 14, wherein said support means comprises a cylindrical member and an expander for coupling said mechanical means of rotation to said cylindrical member, said disc valve being integrally formed with said expander. The valve assembly according to claim 14, wherein said support means comprises a cylindrical member coupled to said mechanical means of rotation and a pin in said pump body coupled to said cylindrical member, said disk valve being mounted on said Barrette. A discharge valve assembly adapted for use with a pump sprinkler, for mounting on a liquid container, the sprinkler has a pump body that includes a discharge cylinder having a discharge orifice at a downstream end thereof, the valve assembly comprises a flexible disc valve having an outer peripheral edge in sealing engagement with an inner wall of said cylinder in a closed valve position, means comprising a mechanical means of rotation fixed to said downstream end and a filling member disposed in said cylinder extending substantially between an upstream end of the cylinder and said mechanical turning means to reduce the volume of liquid product inside the cylinder during the operation of the pump sprinkler, said filling member defines a discharge passage for the discharge of the liquid product from the orifice. The discharge valve assembly according to claim 32, wherein the valve is connected to the mechanical turning means for movement along the length of the cylinder during the operation of the pump. The discharge valve assembly according to claim 32, wherein the disk valve is made of flexible material. The discharge valve assembly according to claim 33, wherein the valve is positioned adjacent the upstream end of the cylinder. The discharge valve assembly according to claim 33, wherein the valve is positioned adjacent to the downstream end of the cylinder. The discharge valve assembly according to claim 32, wherein the filling member interconnects the mechanical means of rotation with the valve. The discharge valve assembly according to claim 37, wherein the valve is positioned adjacent the upstream end of the cylinder. The discharge valve assembly according to claim 37, wherein the valve is positioned adjacent the upstream end of the cylinder. The discharge valve assembly according to claim 37, wherein the valve is located between said ends upstream and downstream. A discharge valve assembly adapted for use with a pump sprinkler, for mounting on a liquid container, the sprinkler has a pump body that includes a discharge cylinder having a discharge orifice at a downstream end thereof, the valve assembly comprises a flexible disk valve having an outer peripheral edge in sealing engagement with an internal wall of said cylinder defining a valve seat, means comprising a mechanical means of turning fixed at said downstream end, said disc valve being mounted on a connecting rod member that rests along a central axis of said cylinder and that engages said mechanical turning means for axial relative sliding movement thereto during operation of the pump sprinkler. The discharge valve assembly according to claim 41, wherein the connecting rod member is coupled to a depression formed in said mechanical means of rotation to at that point define a suction chamber in communication with said hole to retract liquid product from said hole during the sliding movement of the connecting rod member of the hole. The discharge valve assembly according to claim 41, wherein the disk valve is in an adjacent position to an upstream end of the cylinder. The discharge valve assembly according to claim 41, wherein the disk valve is in a position adjacent to said mechanical turning means. The discharge valve assembly according to claim 41, wherein the disk valve is made of flexible material. The discharge valve assembly according to claim 42, wherein the spring means is located in said suction chamber to deflect said connecting rod member in the opposite direction to said opening.