Page 57 of 66 Pages
9.7.2.4 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.
9.7.3 Safety Process Description
9.7.3.1 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.
9.7.3.2 The user start a sterilization cycle by pressing a
“start” key on the operating panel.
9.7.3.3 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 85
C.
9.7.3.4 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
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