Primary Pressure Regulator for Water, Oil & Gas GD-20R / 10 Bar, Flange 1/2" ~ 6"

Type : Water & Air, Ductile Iron, 10 Bar, Flange 1/2"~ 6"
Application : Water, Oil, Air, Gases
Inlet Pressure : 10 Kg/Cm2
Relief Pressure : 0.5 ~ 7 Kg/Cm2
Spring Options : A - 0.5 ~ 2.5 Kg/Cm2
Spring Options : B - 2.6 ~ 7 Kg/Cm2
Temperature : 80 C
Flow Rate : 1.5 ~ 200 M3/Hr
Size : 1/2" ~ 6"
Connection : Flange JIS 10K
Body : Ductile Iron
Trims : Disc/NBR, Seat/Bronze

Yoshitake GD-20R is installed Downstream of Pump acting as Bypass / Proportional Relief Valve as Back Pressure increases. This is crucial in order to maintain Stable Downstream Pressure in pipeline. It differs from Safety/Relief Valve is that it operates proportionately / smoothly.
https://www.yoshitake-inc.com/prod/product?no=309