... DN50-600 Body material,: Ductile iron Pilot: SS304 Pressure:PN25/16/10 Certificate with WRAS, KTW, NSF, FDA, ACS. ... operated, pilot-controlled, modulating valve designed to maintain constant upstream pressure within close limits. This valve can be used for pressure relief, pressure sustaining, back pressure ... options not listed, consult US PLS. Pressure Sustaining and Reducing Valve PN 25/16/10