Series: GU   Overflow and pressure relief valve, with lifting lever Design: ISO     Housing material: Ductile cast iron EN-JS 1049 Lining material: PFA Nominal size:  DN 25 - 80 Nominal pressure:  PN 16 Flange:  ISO 7005-2 Type B Face to face (mm):  160 to 310 Actuation:  pressure related       Details   Series: GUT   Overflow and pressure relief valve, without lifting lever Design: ISO     Housing material: Ductile cast iron EN-JS 1049 Lining material: PFA Nominal size:  DN 25 Nominal pressure:  PN 16 Flange:  ISO 7005-2 Type B Face to face (mm):  160 Actuation:  pressure related       Details