8
Unidirectional Series
Operation and Maintenance Manual
Troubleshooting
Trouble Possible cause Solution
Media oozing out of gland packing Packing deteriorated Replace packing
In fully closed position, valve leaks
Seat is worn out or torn Replace seat
Gate is scratched Replace gate
High torque during valve seating and
unseating
Misalignment between gate and stem
a) Remove the clevis fasteners
b) Loosen the superstructure fasteners
c) Adjust the alignment of the stem and
gate
d) Connect the clevis fasteners
e) Retighten superstructure fasteners
Packing is not tighten properly Adjust gland nuts
Valve jerks during open and close
Superstructure fasteners loosen Tighten the super structure fasteners
Insufficient air supply
Pneumatic operated valves: Increase supply
pressure
Solenoid valve dust accumulation Remove and clean solenoid valve
Piston rod seal damaged Replace seal
Unable to close or open the gate Gate is bent
a) Check for valve orientation, flow direc-
tion and flow indication
b) Re-orient the valve
c) Replace gate
All statements, technical information, and recommendations
in this bulletin are for general use only. Consult Bray/VAAS
representatives or factory for the specific requirements and
material selection for your intended application. The right to
change or modify product design or product without prior notice
is reserved. Patents issued and applied for worldwide.
Bray
®
is a registered trademark of
Bray International, Inc.
© 2015 Bray International, Inc. All rights reserved.
OM_Series_940_12_20_2016
Bray/VAAS
Division of Bray International, Inc.
13333 Westland East Blvd.
Houston, Texas 77041
Tel: 281.894.5454 • www.bray.com
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