A liquid delivery apparatus includes a base assembly; a vessel into which liquid may be introduced to at least partially fill the vessel and to pressurize the liquid in the vessel; a nozzle including a discharge tube and a nozzle outlet, wherein the nozzle is rotatable with respect to the base assem
A liquid delivery apparatus includes a base assembly; a vessel into which liquid may be introduced to at least partially fill the vessel and to pressurize the liquid in the vessel; a nozzle including a discharge tube and a nozzle outlet, wherein the nozzle is rotatable with respect to the base assembly, and the nozzle outlet is provided at a distal end of the nozzle via which the liquid may be discharged from the vessel under the pressure of the liquid in the vessel; and a valve between the vessel and the nozzle to control passage of liquid from the vessel to the nozzle outlet; wherein the valve and nozzle discharge tube are substantially in line. A drive system is also disclosed that drives rotation of the nozzle with respect to the base assembly. The drive system may be configured to propel the liquid delivery apparatus along the ground.
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1. A liquid delivery apparatus comprising: a base assembly;a vessel into which liquid may be introduced via an inlet to at least partially fill the vessel and to pressurize the liquid in the vessel;a nozzle comprising a discharge tube and a nozzle outlet, wherein the nozzle is rotatable with respect
1. A liquid delivery apparatus comprising: a base assembly;a vessel into which liquid may be introduced via an inlet to at least partially fill the vessel and to pressurize the liquid in the vessel;a nozzle comprising a discharge tube and a nozzle outlet, wherein the nozzle is rotatable with respect to the base assembly, and the nozzle outlet is provided at a distal end of the nozzle via which said liquid may be discharged from the vessel under the pressure of the liquid in the vessel;a valve between the vessel and the nozzle to control passage of liquid from the vessel to the nozzle outlet, the valve being configured to open in response to the pressure in the vessel; anda drive system configured to drive rotation of the nozzle with respect to the base assembly, the drive system including a ratchet assembly having a ratchet gear coupled to the rotatable nozzle and a ratchet linkage, the ratchet linkage being arranged to drive rotation of the ratchet gear, wherein the ratchet linkage is driven by virtue of a pressure change in the liquid at the inlet to the liquid delivery apparatus. 2. The liquid delivery apparatus of claim 1, wherein the valve is connected to the nozzle such that the valve and nozzle are rotatable with respect to the base assembly. 3. The liquid delivery apparatus of claim 1, wherein the vessel is connected to the nozzle such that the vessel and nozzle are rotatable with respect to the base assembly. 4. The liquid delivery apparatus of claim 1, wherein the vessel is directly connected to the valve. 5. The liquid delivery apparatus of claim 1, wherein the valve comprises a valve seat and corresponding valve closure which may selectively engage the valve seat to prevent flow through the valve. 6. The liquid delivery apparatus of claim 5, wherein the valve seat and valve closure are in line with the nozzle discharge tube. 7. The liquid delivery apparatus of claim 5, wherein the valve further comprises a valve shaft, the valve closure being connected to the valve shaft, and wherein the valve shaft is in line with the nozzle discharge tube. 8. The liquid delivery apparatus of claim 5, wherein the valve further comprises a fairing disposed on a downstream surface of the valve closure, the fairing being disposed to prevent or limit flow separation downstream of the valve closure. 9. The liquid delivery apparatus of claim 1, wherein the valve further comprises a pressure surface arranged to selectively open or close the valve by virtue of the pressure of air occupying the remainder of the vessel acting on the pressure surface. 10. The liquid delivery apparatus of claim 1, wherein the valve further comprises a pressure surface arranged to selectively open or close the valve by virtue of the pressure of the liquid in the vessel acting on the pressure surface. 11. The liquid delivery apparatus of claim 1, wherein the liquid delivery apparatus further comprises an air pump for pumping air into the vessel, the air pump being operatively connected to the nozzle discharge tube such that the flow of liquid through the nozzle discharge tube drives the air pump. 12. The liquid delivery apparatus of claim 11, wherein the air pump comprises a moveable member dividing first and second chambers of the air pump, the first chamber being in fluidic communication with the nozzle discharge tube such that the flow of liquid through the nozzle discharge tube moves the moveable member in a first direction and an at least partial vacuum created behind the flow of liquid moves the moveable member in a second direction, the movement of the moveable member thereby generating a pumping effect in the second chamber. 13. The liquid delivery apparatus of claim 1, wherein the liquid delivery apparatus further comprises a nozzle guard disposed at the distal end of the nozzle, the nozzle guard extending substantially in the same direction as the liquid that is ejected from the nozzle outlet. 14. The liquid delivery apparatus of claim 1, wherein the liquid delivery apparatus further comprises an inlet assembly arranged to receive liquid into the vessel, the inlet assembly comprising a connecting portion connectable to a supply pipe, the connecting portion being rotatable with respect to the remainder of the inlet assembly. 15. The liquid delivery apparatus of claim 1, wherein the liquid delivery apparatus further comprises a wireless communication means for communicating data to or from a base station or other liquid delivery apparatuses. 16. The liquid delivery apparatus of claim 1, wherein the drive system is configured to propel the liquid delivery apparatus along the ground. 17. The liquid delivery apparatus of claim 1, wherein the ratchet gear comprises a prime number of teeth. 18. The liquid delivery apparatus of claim 1, wherein the drive system further comprises a bellows in fluidic communication with liquid upstream of the vessel, and wherein the bellows is operatively coupled to the ratchet linkage such that pressure variations in the bellows drives movement of the ratchet linkage, which in turn drives rotation of the ratchet gear. 19. The liquid delivery apparatus of claim 1, wherein the valve and nozzle discharge tube are arranged so that they are substantially in line.
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