Bulletin hy14-1450-M1/us installation and Service Guide



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Bul HY14-1450-M1 BD15-BD30

Very high flow to cyl. 
port with little or no 
current input.
1. Pilot valve malfunction.
1. Return to factory.
1. Valve drive electronics gain set too 
high or some other misadjustment.
1. Reset the electronics. See electronics 
installation manual.
2. Partially plugged orifice or filter.
2. Check pilot pressure at test port and/or 
remove, inspect, and clean orifice/filter per 
Servovalve Maintenance Section.
3. Sticky spool.
3. Return valve to factory.
High null bias. (high 
input current required to 
maintain actuator or 
motor stationary.)
Output flow obtained 
from one port. (Actuator 
hard over no response to 
servo command.)
Oscillation or hunting 
motion of actuator in the 
closed loop system.
Servovalve does not 
follow input command. 
(Actuator or motor is 
stopped.)
Sluggish valve. 
(Servovalve output lags 
electrical command 
signal or it fails to meet 
its rated output.)


Flow Control Servovalves
Bulletin HY14-1450-M1/US
Bul 1450-M1pgs.p65, dd
13
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio, USA
The items described in this document and other documents or descriptions provided by Parker Hannifin Corporation, its subsidiaries and its authorized
distributors are hereby offered for sale at prices to be established by Parker Hannifin Corporation, its subsidiaries and its authorized distributors. This
offer and its acceptance by any customer ("Buyer") shall be governed by all of the following Terms and Conditions. Buyer’s order for any such items,
when communicated to Parker Hannifin Corporation, its subsidiary or an authorized distributor ("Seller") verbally or in writing, shall constitute acceptance
of this offer.
alter, discard or otherwise dispose of any special tooling or other property
in its sole discretion at any time.

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