Section 1 Basic Information
1-9
The following line drawings and text explains basic valve
operation.
When the valve is in a closed position, the solenoid is not
energized. Water has bled through the diaphragm bleed
orifi ce placing incoming line pressure on top of the
diaphragm. The bottom of the diaphragm is essentially
at atmospheric pressure (open to the outlet) and the
pressure differential holds the valve shut.
When the solenoid is energized, the resulting magnetic
fi eld pulls the armature up into the valve guide. The
armature spring is compressed by this action. When the
armature moves up, it allows the water on the top of the
diaphragm to drain through the main orifi ce.
The diaphragm bleed orifi ce is much smaller than the
main orifi ce and will not admit enough water to maintain
pressure on the top side of the diaphragm. Thus, as the
pressure on the top of the diaphragm is reduced to
almost zero, pressure on the bottom lifts the diaphragm
off the valve seat, allowing a full fl ow of water.
When the solenoid is de-energized, the armature drops
down, closing the diaphragm main orifi ce. Water
continues to fl ow through the diaphragm bleed orifi ce,
equalizing the pressure and allowing the spring to push
the diaphragm down against the valve seat.
Figure 1-13.
Figure 1-14.
Figure 1-15.
Figure 1-16.
Water Valve Closed
Armature
Armature
Spring
Valve
Guide
Diaphram
Diaphram
Main Diaphram
Orifice
Bleed
Orifice
Solenoid
Water Valve Open and Diaphragm Up
Water Valve Closing
Solenoid Activated
To Next Page
Loading...
