GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 20)

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SECTION 13—Opening and Closing Speed
The opening speed is modified by moving the opening spring
adjusting nut on the opening spring assemblies. A change in
opening speed affects the closing speed. Reference Figure 13.
NOTE: Tightening of the opening spring adjusting nut will
decrease the closing time and speed while increasing opening
time and speeds. Loosening will have a reverse effect.
The operating speeds are as follows:
Operation
Operation Operation Operation Feet Per Second Feet Per Second Feet Per Second Feet Per Second
Open 5.0 nominal, 4.5 minimum
Close 3.5 nominal, 4.0 maximum
V.I. STOP CENTER PHASE
Figure 13 Contact gap adjustment