Theory Of Operation - Graco DV Series Instructions-Parts List Manual

Theory of Operation

Theory of Operation
The valve uses the air-opened, air-closed mode
of operation, therefore, it uses a four-way
exhausting solenoid to control the piston inside
the valve.
The valve has two npt fluid inlet ports. One fluid
inlet port is the supply port, feeding material into
the dispense valve. Use the other fluid inlet port
to recirculate material through the valve or leave
it plugged with the supplied npt plug. The fluid
outlet port dispenses material through a dis-
pense nozzle in regulated amounts.
F . 2: DV Series Theory of Operation
IG
8
Air/Close
Air/Open
Plug
The air-operated piston, rod, and tip move at the
same time. When air moves the piston, rod, and
tip from its seat it opens the fluid outlet port.
When air pushes the piston, rod, and tip into its
seat it closes the fluid port.
The system provides pressurized fluid to the
valve and the system air controls open and close
the valve controlling the fluid flow.
Material Inlet
Material Outlet
TI17327a
3A1792A