Troubleshooting - Samson KMA 495 Originalbetriebsanleitung

Original Betriebsanleitung:
Translation of the original operating instructions:
KMA 495
8.

Troubleshooting

Fault
Valve doesn't close or close
fully
Valve doesn't open or open
fully
Media leakage at diaphragm
flange
Media leakage at pipe
connection
Media leakage at valve body
Control media leakage at
leakage control hole
Control media leakage at
control air connection „open"
(for NC valves) or respectively
© 2018 SED Flow Control GmbH, Bad Rappenau
Potential cause
Control pressure too low (for
NO & DA valves)
Media pressure too high
Control media connection
mixed up
Control media not applied
Defect pilot valve
Foreign matters between weir
and diaphragm
Defect diaphragm
Defect actuator spring (For NC
valves)
Control pressure too low (for
NC valves)
Control media connection
mixed up
Control media not applied
Defect pilot valve
Wrong assembled diaphragm
Defect actuator spring (For NO
valves)
Wrong assembled diaphragm
Tightening torque of screw
connection actuator -
diaphragm too low
Defect diaphragm
Defect actuator
Defect valve body
Media pressure too high
Operating temperature too high
Defect sealing / sealing material
Improper installation
Threaded ends loose
Defect valve body
Defect stem sealing
Defect control diaphragm or
piston lip seal
39
Solution
Use pressure as specified, see chapter
4.2.3.
Do not exceed maximum control pressure,
see chapter 4.2.2.
Check control air connection, see chapter
5.2.
Apply control media
Check pilot valve for function
Disassemble valve, remove foreign
matters and check parts for damage. See
Chapter 5.3.
Change diaphragm, see chapter 6.2.ff
Change actuator, see chapter 5.3.ff
Use pressure as specified, see chapter
4.2.3.
Check control air connection, see chapter
5.2.
Apply control media
Check pilot valve for function
Disassemble actuator and assemble
diaphragm correctly. See chapter 6.2.ff
Change actuator, see chapter 5.3.ff
Disassemble actuator and assemble
diaphragm correctly. See chapter 6.2.ff
Check connection of actuator and valve
body, see chapter 5.3.1.
Change diaphragm, see chapter 6.2.ff
Change actuator, see chapter 5.3.ff
Change valve body
Do not exceed maximum control pressure,
see chapter 4.2.2.
Do not exceed maximum operating
pressure, see chapter 4.2.1.
Change sealing / sealing material
Install valve body proper
Re-tighten connection
Change valve body
Change actuator, see chapter 5.3.ff and
check control media for pollution
Change actuator, see chapter 5.3.ff
BA180001; Version a vom 24.07.2018