Troubleshooting List - GF DIASTAR Serie Manual Instrucciones

Troubleshooting list

9 Troubleshooting list
Problem
Deformation and
expansion of piping /
valve
Premature wear of
diaphragm valve or
individual parts
Leakage to the outside
at flange joint
Leakage to the outside
at union nuts
Leakage between valve
body and housing nut
connection
Leakage at seat
Sluggish valve
Leakage of control
medium on the non
connected air
connections
Possible cause of
fault
Piping stresses due
to restricted
thermal expansion
Material of the
housing or the seal
is inadequately
resistant
Changes in
temperature
Defective seal
Loose association of
nut and valve body
Defective seal
Housing nut is not
tightened properly
Wear of diaphragm
Wear of diaphragm
Wear of sealings
and/or spindle
Wear of sealings
Instruction Manual
Problem fixing
Improve the piping support.

 Choose suitable materials, see
list of "Chemical Resistance" or
the planning fundamentals.
 Tighten joint or if necessary
replace sealings.
 Replace sealings.
 Tighten joint with manual effort.
 Replace sealings.
 Screw housing nut tight, see
chapter 6.3
 Replace diaphragm, see
chapter 8.2
 Replace diaphragm, see
chapter 8.2
 If necessary replace seals and
other functional parts.
 Replace sealings on the spindle
and piston.
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