Spray assembly for a working machine employing direct acting valves
A spray assembly for a working machine that includes a fluid storage tank includes a plurality of nozzle assemblies, each of which includes a direct acting valve. The spray assembly also includes a controller that is operatively connected to each of the direct acting valves for controlling the opening and closing of the direct acting valves, and a selector that is operatively connected to the controller. The selector may be employed by an operator of the working machine to selectively operate one or more of the direct acting valves in order to provide a desired spray pattern of fluid from the fluid storage tank.
1. A spray assembly for a working machine that includes a fluid storage tank and is adapted for operation on a roadway, said spray assembly being in fluid communication with the fluid storage tank and further comprising:
(a) a plurality of nozzle assemblies, each of which comprises a direct acting valve;
(b) a controller that is operatively connected to each of the direct acting valves for controlling the opening and closing thereof;
(c) a selector that is operatively connected to the controller, which selector may be employed by an operator of the working machine to selectively operate one or more of the direct acting valves in order to provide a desired spray pattern of fluid from the fluid storage tank onto the roadway;
wherein each of the direct acting valves is a direct acting poppet valve that is enabled by a linear solenoid;
(d) which includes a support beam that is attached to a frame of the working machine;
(e) which includes a power source for the controller;
(f) wherein each of the nozzle assemblies:
(i) is mounted on the support beam;
(ii) includes a solenoid switch assembly and a valve assembly;
(g) wherein the controller comprises:
(i) a spray control;
(ii) an input module that is operatively connected to the solenoid switch assembly of each nozzle assembly and to the spray control, said input module being adapted to determine if the valve assembly of each nozzle assembly is open or closed;
(iii) an output module that is operatively connected to the spray assembly and to the power source, said output module being adapted to energize the solenoid switch assembly of each nozzle assembly in the spray assembly.
2. The spray assembly of claim 1 , wherein the controller is adapted to employ pulse- width modulation current control to reduce the current required to hold the direct acting poppet valves open.
3. The spray assembly of claim 1 , wherein the input module is operatively connected to one or more sensors for measuring operating parameters of the spray assembly.
4. The spray assembly of claim 1 , wherein each valve assembly comprises:
(a) a nozzle housing which includes a poppet bushing;
(b) a valve housing that is in fluid communication with the fluid storage tank of the working machine and the nozzle housing;
(c) a poppet shaft having an upper end and a lower end;
(d) a poppet which is attached to the lower end of the poppet shaft;
(e) a plunger which is attached to the upper end of the poppet shaft;
(f) a return spring surrounding the poppet shaft and adapted to hold the poppet in abutment with the poppet bushing in the nozzle housing when the solenoid switch assembly is not energized.
5. The spray assembly of claim 4 , wherein each solenoid switch assembly comprises:
(a) a switch conductor that is electrically connected to the power source;
(b) a switch pin insulator that is operatively connected to the switch conductor;
(c) a switch pin that is electrically connected to the switch conductor;
(d) a coil that surrounds the plunger of the valve assembly associated therewith, said coil being electrically connected to the switch pin; wherein the controller is adapted to energize the solenoid switch assembly to cause electricity from the power source to flow through the switch conductor and the switch pin to energize the coil, thereby creating a magnetic field which causes the plunger to be drawn upwardly so that the poppet is not in abutment with the poppet housing.
6. The spray assembly of claim 5 , wherein each valve assembly includes an inlet port in the valve housing that is in fluid communication with the fluid storage tank of the working machine.
7. The spray assembly of claim 5 , wherein each valve assembly includes a travel stop that is located so as to be engaged by an upper end of the plunger when the controller causes electricity to energize the coil to generate a magnetic field to draw the plunger upwardly.
8. The spray assembly of claim 5 , wherein each valve assembly includes a shaft seal that prevents fluid from leaking upwardly around the poppet shaft when the plunger is drawn upwardly so that the poppet is not in abutment with the poppet housing.