ALFA LAVAL UNIQUE RV-ST VALVE INSTRUCTION MANUAL—REV 8/21
4 Operation
Pay attention to possible faults. Study the instructions carefully.
The items refer to the parts list and service kits (chapter 7 Parts list and service kits).
4.2 Troubleshooting
N
NO
OTTE
E!!
Study the maintenance instructions carefully before replacing worn parts. See chapter 5.1 General maintenance.
P
Prroobblleem
m
C
Caauussee//rreessuulltt
R
Reeppaaiirr
External product leakage
Worn or damaged lip
seal and/or O-ring
- Replace the seals
- Replace with seals of a
different rubber grade
Internal product leakage
- Worn or product affected
plug seal
- Replace the seal
- Replace with a seal of a
different rubber grade
- Product deposits on
the seat and/or plug
- Frequent cleaning
- Product pressure exceeds
actuator specification
- Replace with a high pressure actuator
- Use auxiliary air on the spring side
(do not exceed 3 bar/43.5 PSI). Alfa
Laval article number = 9611995903.
See section 2.3 Safety precautions
and section 3.2 General installation
, Step 4
- Reduce product pressure
Water hammer
The flow direction is the
same as the closing direction
- The flow direction should be
against the closing direction. See
section 3.2 General installation ,
- Throttle air release of solenoid in
top unit
The valve does not
open/close
Product pressure exceeds
actuator specification
- Replace with a high pressure actuator
- Reduce product pressure
- Use auxiliary air on the spring side.
Always use the pressure relief fittings
(3 bar/43.5 PSI) on support side.
Alfa Laval article number =
9611995903
If marked with a danger warning, do N
NO
OTT attempt to cut the actuator open, due to spring under load.
DO NOT DISASSEMBLE
kg
!
Do N
NO
OTT attempt to disassemble the actuator due to spring under load danger!
SPRING UNDER LOAD
kg
!
Do N
NO
OTT attempt to cut the actuator open due to spring under load danger!
21
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