Description : 

These over-range protectors have been designed to protect pressure
gauges (or other instruments) against accidential overpressure.
The medium must be a clean gas or fluid without particles and with low
viscosity.
Working principle:
The applied pressure works against an adjustable internal spring by
means of a bellow or piston.
As soon as the pressure reaches the adjusted setpoint, an internal
valve closes and avoids further pressure increase on the outlet side.
When the pressure decreases, the valve will open 20 % below the
closing pressure.
Two models are available according to the ranges for the setpoint
adjustment (AORP-0, AORP-B, see ordering details on page 2).