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Model 78 exhausts “too much air”

Q: For the Model 78,  when it impacts it seems to exhaust a lot of air. This is normal correct? Its just some sort of a quick exhaust?

A: The seals are design to release the air when the marker contacts the part. The cylinder is not design to remain in the extended position, 

Model 78 Suggested pneumatic control diagram

Excerpt from Operation Guide:

Electrical Sequence for Double Solenoid Valve: To advance marker, energize solenoid “A”. To return marker and reset, deenergize solenoid “A” and ENERGIZE solenoid “B”.

Electrical Sequence for Spring Return Valve: To advance marker, energize solenoid “A”. To return marker and reset, de-energize solenoid “A” after part is marked. 

Speed Control Adjustment: Adjust speed control “R” to control speed of retract motion. DO NOT install speed control on forward (rod) port of marker. 

Note: For most efficient operation, electrical signal energizing solenoid “A” should be very short, approximately .06 to .10 seconds.

Model 78 Operation Guide

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