GE Spacemaker WSM2700L, Technician Manual

Page: 34 / 56

The illustration shows a valve in
t h e c l o s e d p o s i t i o n a n d n o t
energized. Water has passed through
the diaphragm bleed orifice, placing
incoming line water pressure on top
of the diaphragm. The bottom of the
i d a p h r a g m i s e s s e n t i a l l y a t
a t m o s p h e r i c p r e s s u r e ( o p e n t o
outlet). This pressure differential
will hold the valve shut.
When the solenoid is energized, the
resulting magnetic field pulls the
armature up into the valve guide.
The armature spring is compressed by
this action. Wehn the armature
moves up, it allows the water on the
top side to the diaphragm to flow
through the main orifice.
The diaphragm bleed orifice is much
smaller than the main orifice and
will not a d m i t e n o u g h w a t e r t o
maintain pressure on the top side of
the diaphragm, thus the pressure on
the top of the diaphragm is reduced
to almost z e r o . T h e r e f o r e , the
pressure under the bleed orifice
lifts the diaphragm off of the valve
seat allowing a full flow of water.
When the solenoid is de-energized,
the armature drops down, closing the
d i a p h r a g m m a i n o r i f i c e . Water
c o n t i n u e s t o f l o w t h r o u g h t h e
diaphragm bleed orifice, building up
pressure until it equalizes on both
sides o f the diaphragm. The spring
then f o r c e s t h e d i a p h r a g m d o w n
against the valve seat.
TO TEST WATER VALVE
A . Make a continuity check of the
harness to determine whether or
nat a circuit exist.
B.
Use an ohmmeter, resistance of
t h e s o l e n o i d s h o u l d b e
approximately
ohm
@77 degree
GEAS 061189