Wascomat Clarus Control SU620 - Drain Valve; Description; Function

179
Drain valve
Description
Thedrainvalveissituatedonaangeatthebot-
tom of the outer drum and can be accessed from
the front after removing the front cover.
The drain valve consists of the following principal
parts:
• Lowerpartwithrubberdiaphragm.
• Pistonandcylinder.
• Pressureplateandrecoilsprings.
• Rubberdiaphragmwithdrainconnection.
• Upperpartwithconnectionforouterdrum.
Function
The drain valve uses the water pressure in the
cold-waterinlettoclosethevalve.Afeedhose
is connected between the water inlet and the
control valve.
When the control valve operates (drain valve
should be closed), the control valve opens the
water pressure onto the feed hose, which is con-
nected to the lower part of the drain valve. When
the lower part is filled with water, the lower part
diaphragm pushes up the piston. The piston lifts
the pressure plate against the drain valve rubber
diaphragm, which in turn forms a seal against
the outer drum, effectively closing the valve.
When the drain valve should be opened, the
control valve changes position to allow the water
pressure to the lower part of the drain valve to
close, instead opening the return hose to the
drain. The pressure plate recoil springs pull the
pressure plate back, upon which the piston is
pressed back into the cylinder. The water from
the lower part is fed through the feed hose and
the control valve to the drain.
3359
Cylinder
Feed hose
Control valve
Feed hose
Lower part
Diaphragm
Piston
Pressure plate
Rubber
diaphragm with
drain connection
Return hose
Recoil springs
Principal
diagram
1
2
Drain valve
1
2
5468
Drain valve