Tuttnauer 6671130, Operation & Maintenance Manual

Page: 28 / 143

MAN205-0195042EN Rev. A Aug. 2011
Page 22 of 137 pages
3.2 The Piping System
The piping system of the autoclave consists of air-operated valves, which control the
condensate and steam flow in and out of the chamber, operate the vacuum, and the air
inlet valve. The air pulses to the pneumatic valves are transmitted through solenoid pilot
valves, operated at 24VDC.
The functions of the valves are as follows:
Steam to jacket (91)
–
introduces steam into the jacket to accelerate the heating of the
chamber and to maintain a stable and uniform temperature in the chamber during the
sterilization and drying stages.
Steam inlet valve (93)
–
introduces steam from the jacket into the chamber, for heating
and maintaining the chamber temperature during the sterilization phase.
Building steam inlet valve (90)
–
introduces steam directly from the building source
into the system. This valve is controlled by an ON-OFF-ON switch on the front panel.
Generator steam inlet valve (92)
–
introduces steam from the steam generator into the
system. This valve is controlled by an ON-OFF-ON switch on the front panel.
Air inlet valve (43)
–
introduces filtered ambient air into the chamber at the end of the
cycle to break the vacuum and enable the opening of the door.
Fast exhaust and vacuum valve (75)
–
This valve performs two functions:
1) To exhaust the steam from chamber.
2) To connect the chamber to the vacuum pump to create vacuum in the
chamber in the air removal and drying stages.
In both actions, exhaust and vacuum, the flow path of the fluids is through the condenser
(heat exchanger) and the vacuum pump to drain.
Condensate valve (74)
–
evacuates the condensate from the chamber during heating
and sterilization phases and isolates the chamber from the drain pipe, during vacuum
generation. It operates like a slow exhaust valve at the end of slow pressure programs.
Water to vacuum pump valve (15)
–
is connected to the tap water reservoir and
supplies the water required by the operation of the vacuum pump.
Water to heat exchanger valve (12)
–
introduces tap water to the heat exchanger to
cool the fluids at the inlet of the vacuum pump.
Pressure to gasket valves (94 1-2)
–
control the steam pressure to the door gaskets.
When the doors are closed, steam enters through the valves into the grooves behind the
gaskets pushing them against the doors to seal the chamber.