Operating Instructions for ERU Knife Gate Valve K1 with electric actuator
7
Initial Operation
After installation, the valve has to be checked for smooth operation.
It has to be moved at the operating element over the whole travel (OPEN-CLOSED).
In
case of lower working pressures, after having carried out the pressure test of the pipeline, the
profile seal can be released to be adapted to the effective working pressure. For
this purpose, the bolts on the cover plate have to be loosened in an appropriate manner. By
means of this measure you can reduce wear and tear of the components involved in the
motion.
ATTENTION! The flow medium may penetrate. Wear safety clothing (safety goggles)
in case of toxic or caustic media.
8 Operation
Trouble
Possible Causes
Remedy
Leakage at the
cover plate
Prestress too low
Readjustment of cover plate
see paragraph “9 Maintenance“
Wearing of the profile seal
Replace profile seal
Contamination
(deposit on the gate)
With valve in open position:
clean and grease gate
Seat leakage
Contamination of the gate
With valve in open position:
clean and grease gate
Defective U-shaped sealing element Replace sealing element
Excessive operating
forces
Contamination (deposit) on the gate
With valve in open position:
clean and grease gate
Stem running dry
Regrease thread
Operation blocked
Residues of flow medium are
hardened
Relieve pipe section from pressure.
Clean and grease all accessible surfaces of
gate and stem.
Slacken cover plate. Slightly unscrew upper
body bolts. Knock on the valve with a rubber
mallet trying to operate the valve. If you are not
successful: remove, dismantle, clean, replace
damaged parts.
Foreign bodies jammed in the
seating zone
Move valve in OPEN position and repeat
closing procedure
BA46E033
July 2005
Rev. 4
ERHARD-Armaturen
x
D-89502 Heidenheim
x
Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info
@
erhard.de
Internet: http://www.erhard.de
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