Troubleshooting - Samson 327 Originalbetriebsanleitung

Translation of the original operating instructions
Type 327
8.

Troubleshooting

Fault
Valve doesn't close or close
fully
Valve doesn't open or open
fully
Media leakage at diaphragm
flange
© 1994 - 2022 SED Flow Control
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
64
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.
BA220002 Version: a