This valve is designed to relieve the system of higher than normal pressures.  It is normally set at 15-20% above the normal operating pressure.  Once the pressure falls below the set point, it will automatically re-set.  It will operate in this manner for a limited number of times.
 
Rated Pressure
5000 PSI
345 bar
Pressure
5000 PSI
 
Design Temperature
160 °F
71 °C
Flow
10 GPM
40 L/min
Rated Pressure
5000 PSI
345 bar
Inlet
 
3/8
Weight
0.3 lbs
0.14 kg