Servovalve Maintenance
General
This section provides maintenance instructions for the
BD Series servovalves.
Except for orifice changing and filter removal, cleaning
and reinstallation, field disassembly of the servovalves
should never be attempted.
Filter Maintenance
If the valve performance appears sluggish or exhibits
slow overshooting, the valve filter is the first thing to
check. It can be serviced as follows:
1. Wipe the surface around the valve mounting flange
as clean as possible, then loosen the four bolts
securing valve to mounting pad.
2. Remove the valve, taking care not to set the uncov-
ered port flange of the servovalve on a contaminated
surface.
3. Inspect the port flange carefully, and if necessary,
remove contamination using a clean wipe. Make
certain that contamination is prevented from entering
open fluid ports.
4. Using the special wrench 820000TF3-1 remove the
filter cartridge. See Figure 4.
Figure 4. Filter Cartridge Removal
5. Clean the filter by soaking it in trichloroethylene or
other suitable solvent for 5 minutes, and blow dry from
the inside out using filtered, dry, compressed air.
6. Be sure the cartridge is dry and free from solvent
before reinstalling.
7. Inspect the filter for cleanliness and damage to
screen.
8. Position the filter in the servovalve cavity using the
820000TF3-1, wrench.
9. Tighten the filter to 15 - 30 in. lb. above run down
torque.
10. Install servovalve on the mounting pad. Refer to
pages 2 and 5 as required for installation.
Installation & Service Information
Series BD15 and BD30
Bulletin HY14-1450-M1/US
Bul 1450-M1pgs.p65, dd
Flow Control Servovalves
10
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