7 Trouble-shooting
Fault description Cause Remedy
Metered fluid continuous leaves the
return line when the metering pump is
running (bypass connection)
Open "Overflow function"
rotary knob
Close rotary knob (turn to
the right)
System pressure too high Check system pressure
and increase
overpressure setting if
necessary
Overpressure set too low Increase overpressure
setting
Ball sealing seat fouled Dismantle and clean
Overflow-function thrust
spring defective
Overflow-function thrust
spring defective
Counterpressure higher
than overpressure
(opening pressure)
Adjust pressures
Chemical attack of the
ball valve
Check resistance
Tank runs empty (metering point below
level of metered fluid in tank)
"Pressure-maintenance
function" rotary knob
loose
Tighten rotary knob
Counterpressure set too
low
Increase counterpressure
setting
Diaphragm seal seating
fouled
Dismantle and clean
Counterpressure-function
thrust spring defective
Counterpressure-function
thrust spring defective
Metered fluid escapes at the
"Overpressure" rotary knob during
venting or with the overflow function
active
Diaphragm defective Replace
Metered fluid escapes at the
"Counterpressure" rotary knob during
normal operation
Diaphragm defective Replace
Metered fluid escapes from the gap
between the valve body and the valve
head
Valve-housing bolts loose Tighten using a crosswise
alternating pattern
(T
orque: 8 Nm)
Not possible to set overpressure Adjustment Knob B is in
V
enting position
Close Adjustment Knob B
(turn to right) and adjust
Ball valve fouled Clean valve, replace ball
seating if necessary
Not possible to set counterpressure Adjustment Knob A is in
V
enting position
Close Adjustment Knob A
(turn to right) and adjust
Trouble-shooting
27 417101224 Rev. 05-05.2019
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