Nordson Auto-Flo II Product Manual

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Auto-Flo II Zero Cavity Dispense Valves4Part 1103506-06 2018 Nordson CorporationTheory of OperationNOTE: Throughout the remainder of this manualthe Auto-Flo II Zero Cavity Dispense Valve isreferred to as the dispense valve.See Figure 1. When air is supplied to thevalve-open air inlet (5), the piston is pushedupward, pulling the piston stem (4) off the seat (3).Material flows into the material inlet (2) and out ofthe nozzle.When air is shut off from the valve-open air inlet (5)and supplied to the valve-close air inlet (1), the airpressure along with the spring on top of the pistonforces the piston stem back into the seat. Materialstops dispensing. The Spring-Close dispensevalve does not have a valve close-air inlet. Thecompressed spring forces the piston stem back intothe seat when the air is shut off.The dispense valve can be temperatureconditioned using a temperature control unit (TCU).The TCU maintains coating material at the desiredapplication temperature.12354Figure 2 Typical Dispense Valve OperationNOTE: Refer to Water Requirements forTemperature Conditioning in the Specificationssection for information on the types of water to usewith the dispense valve.SpecificationsThe following paragraphs provide specifications forthe dispense valves.GeneralDimensions: See Figure 3.Approximate Weight: oz (kg) XD:23 (0.649)Standard:18 (0.508)Spring-Close:26 (0.726)Spring-Closewith PistonSpacer:???Maximum static fluidpressure rating: psi (bar)5000 (345)Actuating air pressure: psi (bar) 60−120 (4−8)