... -600 Body material,: Ductile iron Pilot: SS304 Pressure:PN25/16/10 Certificate with WRAS, KTW, NSF, FDA, ACS. Medium: Water/Oil ... used for pressure relief, pressure sustaining, back pressure, or unloading functions in a by-pass system. In operation, the valve is ... US PLS. Pressure Sustaining and Reducing Valve PN 25/16/10