Minimises risk of backflow of gases.
It blows off, when pressure exceeds 200 cm of water column.

Nitrous oxide supply to patient interlocked with oxygen supply making it impossible for nitrous oxide to be administered to patient in the absence of oxygen pressure in Pressure Relief Valve is also provided.

Top tray
Storage box
Self-sealing Schrader type oxygen outlets for driving ventilators.
Rear platform to accommodate “B” type cylinder/s.
Nitrolock: Basic safety against accidental delivery of Nitrous oxide, when oxygen flow meter is closed.
Oxyfailure Alarm: Audible alarm for minimum seven seconds in case of oxygen supply pressure drops below 2 kPa x 100
Pressure Relief Valve: Mechanical safety against increase in low pressure circuit set at 20kPa