Inlet Valve, Steam - Electrolux FLE120 Service Manual

Service
Manual
Description
The steam valve is operated electromagnetically
and has a plunger with a valve head as opening
and closing element.
The valve utilises the steam pressure for opening
and closing. In a closed position the electromagnet
is unactivated and the releif hole in the centre of the
plunger is closed by the armature through its
pressure spring. The plunger pressure spring
moves the plunger and valve head against the
valve seat.
By means of a pilot-pressure hole in the plunger the
steam pressure forces the plunger and valve head
against the valve seat with a force proportional to
the steam pressure. The valve closes.
When the valve is to open the magnet is energised,
the armature lifts and exposes the relief hole in the
centre of the plunger. When the overpressure on
the upper side of the plunger is gone, the steam
pressure in the supply line can lift the plunger and
valve head, and the valve opens.
Repair instructions
It is vital to the operation of the steam valve that the
pilot pressure and relief holes are clean and
unobstructed.
For this reason, the valve should be taken apart
and cleaned at specific intervals which depend on
operating conditions and the purity of the steam.
The valve refuses to open
• Check that the coils is energised.
• Take measurements at the coil in order to look
for break of short circuit.
• Take the valve apart and check the openings in
the valve head and plunger centre.
The valve refuses to close
• Check that the coil is de-energised.
The valve is normally closed when the magnet is
unactivated.
• Check the return spring.
• Check the diaphragm.
9406

35. Inlet valve, steam

Coil
Armature
Pressure
spring
Valve
head
Flow
35
Pressure
spring
Plunger
Center of
plunger
Pilot
press-
ure hole
Relief hole
1