Page 5 of 101 pages
2.
FUNCTIONAL DESCRIPTION
2.1 The Piping System
The piping system of the autoclave consists of air-operated ball valves, which
controls the condense and steam flow in and out of the chamber, operates the
vacuum, and the air inlet valve. The air pulses to the pneumatic valves are
transmitted through solenoid pilot valves, operated at 24VDC. (The water valves
are of Globe type).
The functions of the valves are as follows:
Air-operated valves
Steam inlet valve (93);
introduces the steam from the jacket into the chamber, for
heating and maintaining the chamber temperature during the sterilization phase.
Steam to jacket (91);
enters the 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.
Air inlet valve (43);
enters filtered ambient air at the end of the cycle to break the
vacuum and enable the opening of the door.
Fast exhaust and vacuum valve (75);
has two functions: to exhaust the steam from
chamber and to connect the chamber to the ejector to create vacuum in the
chamber in the air removal and drying stages.
In the two stages, exhaust and vacuum, the flow path of the fluids is through the
ejector 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 program.
Water to ejector valve (15);
is connected to the feed water supply and supplies the
water required for the operation of the ejector.
.
Note: The valve numbers are in accordance with the valve numbering list
and piping diagram at the end of the manual.
Pneumatic safety component is installed in the autoclave:
A pneumatic switch that prevents entry of steam into the chamber while
the door is open (see pneumatic switch VM830 in drawing on page 7).
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