Parker Series V14 - Controls - general information; AC control description

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Parker Hannin
Pump and Motor Division
Trollhättan, Sweden
Service Manual
Series V14
Bulletin HY30-5510-M1/UK
Controls - general information
AC control description
1. AC control cover
2. Servo valve spool
3. Modulating spring
4. Threshold spring
5. Feedback arm
6. Threshold adjustment screw
7. Seal nut
8*. Two-part threshold seal
9. End cover (max displ.)
10. Control module housing
11. Max displ. limiting screw/bushing
12. Set screws
13. Connecting arm
14. Setting piston
15. Min displ. limiting screw/bushing
16. End cover (min displ.)
E. Restrictor location, servo supply
V14_AC_section.eps
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AC control module cross section (as seen from motor
intermediate housing / control module interface).
The following controls satisfy most application
requirements:
• AC (automatic pressure compensator)
• AD (Automatic pressure compensator with
electric override and brake defeat)
• AH (automatic pressure compensator with
hydraulic override)
• EO and HO (two position controls)
• EP and HP (proportional controls)
All controls utilize a servo piston that con-
nects to the valve segment (refer to the illus-
tration on page 4).
The built-in four-way servo valve determines
the position of the servo piston and, in turn,
the displacement.
The displacement angle (between output
shaft and cylinder barrel) ranges from 35°
(max) to 6.5° (min).
Servo supply pressure is obtained from the
pressurized, main port through the corres-
ponding, built-in shuttle valve.
The respons time (i.e. from max-to-min or
from min-to-max displacement) is determined
by restrictors in the servo valve supply and
return lines; refer to the schematics.
* Yellow seal cap is factory mounted. Red seal cap is available as spare part, part no. 3797065.