APL Valve

Adjustable Pressure Limitation valve (APL)

Selecting knob for »MAN« and »SPONT« on pressure limiting:

The APL valve has two functions. It limits the maximum pressure during manual ventilation. It also exhausts excess gas into the scavenger system during manual and spontaneous ventilation.

The APL valve is connected to the patient airway through the ventilator. It functions only when the ventilator is in ManSpont mode or ventilator override condition.

The APL valve has a labeled knob for selecting between spontaneous and manual modes of ventilation and for indicating approximate pressure settings.

When the APL valve knob is rotated fully counterclockwise, pressure is released for spontaneous ventilation. Spontaneous ventilation automatically eliminates resistance to patient exhalation.

In manual mode, the APL valve knob can be rotated to change the pressure threshold at which gas will flow through the valve and into the scavenging system. Clockwise rotation of the APL valve knob increases the pressure threshold, and counterclockwise rotation of the APL valve knob decreases the pressure threshold. Lifting the top of the APL valve knob will temporarily relieve pressure.

NOTE:

The APL valve is automatically excluded from the breathing circuit whenever anautomatic ventilation mode is selected.