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7100 Anesthesia Ventilator
2-22
02/03 1006-0836-000
2.5.5 Bleed
Resistor
The bleed resistor is a “controlled leak” from 0 to 10 L/min in response to circuit
pressures from 0 to 100 cm H
2
O. The small quantity of pneumatic flow exhausting
through the bleed resistor permits control of the exhalation valve's pilot pressure by
modulation of the valve output. The bleed resistor exhausts only clean drive gas and
must not be connected to a waste gas scavenging circuit. The output is routed away
from the electrical components to make sure that systems using oxygen drive gas meet
the 10VA limitation requirement for oxygen enrichment.
2.5.6 Bellows
Pressure Relief
Valve
The Bellows assembly is the interface between drive gas and the patient circuit in the
breathing system. The pressure relief valve (or pop-off valve) in the bellows assembly
limits pressure in the patient circuit. Excess fresh gas is discharged through the
exhalation valve into the gas scavenging system.
The Bellows Pressure Relief Valve (PRV) is normally closed, maintaining
approximately 1.5 cm H
2
O in the breathing circuit in a no flow condition, enough to
keep the bellows inflated. It is piloted closed during inspiration and remains closed
until the bellows is refilled during exhalation. If the pressure in the patient circuit
exceeds 4 cm H
2
O, the pop-off valve opens to exhaust excess fresh gas flow at a rate
up to 4 L/min.
BLEED RESIST0R
VENT TO
ROOM AMBIENT
ATMOSPHERE
PEEP
SAFETY
VALVE
PEEP
CONTROL
VALVE
SUPPLY
PRESSURE
SWITCH
RESERVOIR
EXHALATION
VALVE
BREATHING CIRCUIT
BELLOWS
PRESSURE
RELIEF
FLOW
Summary of Contents for 7100
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Page 102: ...Notes 5 22 02 03 1006 0836 000 ...
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