49
Mechanical and electrical design
Pin of return spring
Tongue of spring
Stop screw
4749
51
Tensioning of return spring
With the valve housing removed:
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Turn the return spring so that the “tongue” of the spring is resting against
the stop screw.
-
Position the valve housing over the return spring so that the pin on the
spring will fit into the recess on the piston rod. (Note: the piston rod
should be installed so its recess is aligned along the housing.)
-
Then turn the housing one turn clockwise. (This will screw the pin of the
spring into the piston rod. The spring will be now tensioned approx. 1/4
of a turn on account of the lead in the piston rod.)
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