Square Wave 745NC Non-Contact Dispense Valve
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To replace piston and needle assembly
1. Remove (4) screws to release stroke control assembly.
2. Remove return spring.
3. With small pliers on spring pilot, pull piston and
needle assembly out of air cylinder.
NOTE:
The piston and needle assembly is one unit
and cannot be disassembled.
4. With small pliers, remove U-cup seal.
5. Clean air actuation body wall. Replace with new U-cup seal,
ensuring that seal groove is facing upwards and expanded
fully in its groove.
6. Replace with new needle assembly. Insert into actuation
body, ensuring that piston seal is not damaged.
7. Reassemble the upper stroke control plate and secure
with (4) screws.
Valve Disassembly and Reassembly
Procedures
Before valve maintenance is performed, shut off valve
actuation and fluid air pressures.
To thoroughly clean fluid body and replace fluid seal
1. Remove nozzle retaining nut and nozzle plate.
2. Remove (4) screws and remove chamber plate.
3. Remove fluid body from actuation body, and then remove spring-
energized PTFE seal.
4. Clean needle with cloth dampened in solvent.
5. Replace with new spring-energized PTFE seal and reassemble valve in
reverse order of disassembly.
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