Tuttnauer 2301006, Operation & Maintenance Manual, Page: 11 / 122

Page 6 of 117 pages
2.3 The Piping System
The piping system of the autoclave consists of air-operated ball valves, which
control the water, condensate and steam flow in and out of the chamber, operate
the vacuum pump, and the air inlet valve. The air pulses to the pneumatic valves is
transmitted through solenoid pilot valves, operated at 24VDC.
The functions of the valves are as follows:
Air-operated valves
Steam to jacket (91); introduces steam from outer source to jacket, to heat the
jacket during the sterilization phase.
Steam to chamber valve (93); introduces clean steam from the steam to steam
generator into the chamber, for heating and maintaining the chamber temperature
during the sterilization phase.
Steam inlet to the generator valve (95) ; introduces steam from the building steam
supply into the steam to steam generator for producing clean steam.
Air inlet valve (43); introduces filtered atmospheric air at the end of the cycle to
break the vacuum and enable the opening of the door.
Fast exhaust to drain valve (73); evacuates the steam from the chamber to drain
at a fast rate, until pressure goes down to zero, in the prevacuum and post -
sterilization phases.
Condense valve (74); evacuates the condense from the chamber in the heating
and sterilization phases and isolates the chamber from the drain pipe during the
vacuum generation. It operates like a slow exhaust valve at the end of the liquids
program.
Exhaust to ejector valve (75); works together with the vacuum valve and connects
the chamber to ejector to create vacuum in the chamber.
Feed water to ejector valve (15); controls the flow of water through the ejector to
produce vacuum in the prevacuum and dry stages.
Mineral free water inlet valve (21); flows water from the mineral free water
reservoir and prevents hot water to return from the steam to steam generator to
the reservoir.
Drain cooling valve (13); flows water to drain, to cool the drain during the steam
and condense evacuation.
Pressure to gasket valve (94); controls the compressed air pressure to the door
gasket. When the door is closed, air enters through the valve into the groove
behind the gasket pushing it against the door to seal the chamber.