Page 46 of 58 Pages
9.2.2.4 Safety opening device (11)
This Safety device is a 3/2 operating pneumatic spring
loaded valve (2 position, 3 ports) that is connected to
the safety port of the door. An angular bracket (12),
which is attached to one of the arms, will push the
valve’s piston to a position that at the instant that the
arms are locked, the safety port of the door is blocked.
At the instant that the arms moves backward the valve
changes its position and the chamber is vented. After
the pressure in the chamber equalizes the ambient
pressure the autoclave’s door can be opened with no
risk for the operator, of steam or hot water burst.
9.2.3 Safety Process Description
9.2.3.1 The user closes the door and rotates the handle
clockwise aprox. 90
a. At the end of the circular movement of the arms
holder, the pin of the locking solenoid slides to its
locking position.
b. When the arms moves the last radial 15 mm, one
arm activate the microswitch, while another arm
(on which there is the angular bracket) pushes the
piston of the 3/2 valve to a position that the
venting port of the door is blocked.
9.2.3.2 The user start a sterilization cycle by pressing a “start”
key on the operating panel.
9.2.3.3 Cycle completion.
There are 6 sterilization programs:
a. Program 1 and 2 will end if the cycle is
completed and
the pressure in the chamber is
below 115 kPa (abs).
b. Programs 3 to 6 will end if the cycle is completed,
the pressure decreases below 115 kPa (abs) and
the chamber temperature decreases below 85C.
9.2.3.4 After all completion conditions are fulfilled, the
operator must rotate the handle a little bit
counterclockwise to activate the microswitch (10).
Activating the microswitch will cause the “door” light
to flash a few times.
When the first step of opening the door is performed
and arms are unlocked turning the handle counter-
clockwise, the arms change direction, the piston is
released and valve opens, chamber is aerated and
residual pressure discharged from the chamber.
This way, the second step, opening the door by pulling
it, can be done safely, with no risk for the operator, of
steam or hot water burst.
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