Electrolux SM 554 Manual de servicio descargar pdf (Pagina 82)

Service

Manual

9406

34. Inlet valve, water

Data

Capacity at 300 kPa 300 l/min

Operating limits 40-1000 kPa

Description

The valve is electromagnetically operated and has

a rubber diaphragm as its opening and closing

element. The valve utilises the water pressure

when opening and closing.

When the electromagnetic is de-energised, the

valve is closed.

The water pressure acts through the pilot pressure

opening on the top of the rubber diaphragm.

Because the water pressure is acting on a relatively

larger area on the top of the diaphragm than on the

bottom (part of the underside of the diaphragm is in

contact with the outlet of the valve, where there is

no pressure) the water pressure from below is

insufficient to lift the diaphragm, so that the

diaphragm forms a seal against the valve seat.

When the magnet is energised, the opening from

the top of the diaphragm to the outlet of the valve is

opened. Since the diameter of this opening is

greater that that of the pilot opening, the diameter

of which is limited by the balancing nozzle, the

pressure on the top of the diaphragm falls. The

water pressure on the bottom of the diaphragm can

then lift the diaphragm and open the valve.

Coil

Armature

Balancing

nozzle

Inlet

Valve body

Coil

Armature

Duct to valve outlet

Com-

pres-

sion

spring

Diaph-

ragm

Outlet

Compression

Spring

Pilot pressure

duct

Balancing nozzle

Rubber diaphragm

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Electrolux SM 554 Manual de servicio Pagina 82

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