| 摘要 |
<p>An agricultural spray implement (10) includes a plurality of removable valve/filter/nozzle cartridges (19). Each removable cartridge (19) has a single housing (20) that retains a magnetized filter (36), a high speed solenoid valve (31) and a spray nozzle (24). In the event the system filter of the spray implement is removed, fine particles which otherwise might clog the solenoid valves are stopped from entering the solenoid valves (31) by the magnetized filters (36) of the valve/filter/nozzle cartridges (19). Each cartridge (19) has a clean-out purge valve so that its magnetized filter (36) can be unclogged without removal of the magnetized filter (36) from the cartridge housing (20). A light emitting diode of the cartridge provides a visual indication that the cartridge is dispensing agricultural liquid. The light emitting diode is turned on when the solenoid valve (31) is controlled to be open. In some embodiments, the light emitting diode is not supplied with current until after the solenoid valve (31) has opened and only a smaller holding current is needed to hold the solenoid valve (31) open.</p> |
