Operating and mounting manual
(translation)
EVF
_______________________________________________________________________________________________________
220.100.112-07
Page 8 /13
Version: 12/2015
TM 3926
7.2 Troubleshooting
plan
Malfunction Possible
causes
Remedy
No flow
Valve does not open
Switch on solenoid drive (800)
Check operating voltage
Working pressure too high
Compare working pressure with the data
on the rating plate
Flange covers were not removed
Remove flange covers
Low flow rate
Clogging in the pipework system
Check pipework system
Valve leaking at seat,
no internal tightness
Valve seat gasket (400) or valve seat
(100) damaged by external particles
See section 8 replace valve
No external tightness Gaskets damaged
See section 8 replace valve
Valve does not close Connected voltage too high
Check whether there is residual voltage,
see section 4.1
Flange fracture (valve/
pipework)
Screws not tightened uniformly, mating
flanges not aligned
Align pipework.
Install new valve
NOTICE!
Observe section 10.0 before all installation and repair work!
Observe section 6.4 when putting the valve back into operation!
8.0 Dismantling of the Valve
In addition to the general installation guidelines and the operation safety order, the following points
must also be observed:
DANGER!
Depressurised pipework system
Cooled
medium
Emptied
installation
Vent pipework systems containing corrosive, inflammable, aggressive or toxic
media
Have dismantling work carried out only by qualified staff (see point 2.3)
8.1
Replacement of spare parts
Shut down the valve as described in section 6.2.
Fig. 1 40-EVF…NH.Ü.. (DN15 – DN25) ; 55-EVF…NH.Ü.. (DN15, DN25)
De-installation of the limit switch mounting
Switch limit switch (803) to zero-potential. Open limit switch housing (120). Loosen
hexagon nut (901/2) and screw it off and remove it together with switch actuator
(513) from the limit switch spindle (243). Loosen hexagon nut (901/3) and remove
it. Take off the limit switch housing (120) with terminal box (716) from the limit
switch connection piece (246). Remove connecting piece limit switch (246) from
solenoid housing (800).
Switch off and dismantle the solenoid drive (800) as described in the operating manual of the solenoid
drive.
DANGER!
After continuous operation, the solenoid drive may be hot! Danger of burns!
Replace the solenoid valve
