Festo SPC11 Series User Instructions page 18

The dimensions refer to the standard sizes of service
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units, proportional directional control valves and
drives.
If angled connectors cannot be avoided, use plug
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connectors from the Quick Star series.
Do not use any restrictors in the supply lines.
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Drive and measuring system
Use only the permitted combinations of valves, drives
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and measuring systems approved of by Festo for the
SPC11.
Observe the permitted fitting positions.
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Mount the measuring system symmetrical to the drive
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stroke.
Mount the drive, the guide and the measuring system
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free of play and flush in the direction of movement.
Specially for drives type DGP(I)(L)−...−...−KF or DGP−... with
suitable guide):
With bilateral air supply, open up completely the ad
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justing screws for the internal end position cushioning.
Use a measuring system with the same stroke length.
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18 Festo SPC11−... 0404a English