Trouble-Shooting - Ecolab MFV III-IV Manuel D'utilisation

8

Trouble-shooting

Fault description
Metered fluid continuous leaves the
return line when the metering pump is
running (bypass connection)
Tank runs empty (metering point below
level of metered fluid in tank)
Metered fluid escapes at the
"Overpressure" rotary knob during
venting or with the overflow function
active
Metered fluid escapes at the
"Counterpressure" rotary knob during
normal operation
Metered fluid escapes from the gap
between the valve body and the valve
head
Not possible to set overpressure
Not possible to set counterpressure
Cause
Open "Overflow function"
rotary knob
System pressure too high Check system pressure
Overpressure set too low
Ball sealing seat fouled
Overflow-function thrust
spring defective
Counterpressure higher
than overpressure
(opening pressure)
Chemical attack of the
ball valve
"Pressure-maintenance
function" rotary knob
loose
Counterpressure set too
low
Diaphragm seal seating
fouled
Counterpressure-function
thrust spring defective
Diaphragm defective
Diaphragm defective
Valve-housing bolts loose Tighten using a crosswise
Adjustment Knob B is in
Venting position
Ball valve fouled
Adjustment Knob A is in
Venting position
31
Trouble-shooting
Remedy
Close rotary knob (turn to
the right)
and increase
overpressure setting if
necessary
Increase overpressure
setting
Dismantle and clean
Overflow-function thrust
spring defective
Adjust pressures
Check resistance
Tighten rotary knob
Increase counterpressure
setting
Dismantle and clean
Counterpressure-function
thrust spring defective
Replace
Replace
alternating pattern
(Torque: 8 Nm)
Close Adjustment Knob B
(turn to right) and adjust
Clean valve, replace ball
seating if necessary
Close Adjustment Knob A
(turn to right) and adjust
417101434 Rev. 5-05.2019