EVACreservestherighttomakealterationstothisspecificationwithout priornotice.
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EVAC
CommercialMarineEquipment
VV
VV
VAA
AA
ACUUMCUUM
CUUMCUUM
CUUM TT
TT
TOILETOILET
OILETOILET
OILET
OPERATIONANDMAINTENANCE
Date: Doc.
20 Apr 2009 3:01012D
5775500 CONTROL MECHANISM, EVAC 90, STAINLESS STEEL, FLOOR MODELS
Description of flushing sequence
In the standby position FIG.1
Control valve 1 is closed. Vacuum in chambers 2 and 3 is
equalized by the jets 4 and 5. Spring force 6 holds the
mechanismin thenon-activated position.
In the just switched position FIG.2
Air pressure applied from the flush button to chamber 7 has
lifted the lever 8 and opened control valve 1.Atmospheric air
has entered chamber 3 through filter 9 and valve 1. The force
from the pressure difference between 2 and 3 has moved the
shaft 10 to the left and the following sequence of events has
occured:
The inlet valve 11 has closed. Vacuum valve 12 has opened.
Vacuumisdistributedvia checkvalve 13todischarge valve18
and water valve 19 which will both open. Chamber 14 is also
subjectedto vacuumthrough checkvalve21.
This vacuum will pull lever 8 and close valve 1 and the timer
function will start. Chamber 3 will be evacuated through jet 5
and the pressure difference 2-3 equalizes.At a certain level,
the counterforce from spring 6 will outweigh and the cycle will
go in the opposite direction:
Thevacuum valve12 willclose.Theair inletvalve 11will open
and atmospheric air enters discharge valve, water valve and
chamber14. Thedischarge valve 18will closeand somewhat
later(because ofthe jet 17),the watervalve 19closes whena
suitable water level has been reached at the bottom of the
bowl.
Returning to standby position FIG. 3
The whole system goes to standby position ready for another
VT-flush.
! NOTE: Diaphragm16 hasthe sameeffective area asthe air
inletvalve 11tobalance thevacuum forces. FIG.3
! NOTE: Check valve 13 ensures that connected valves in
activated position are unaffected by changes in the vacuum
supplylevel.
! NOTE: Ifvacuum istoo loworabsent thefunction isdelayed.
Control valve 1 stays open until chamber 14 is subject to
vacuum.
