function valves with DVGW-certificate, explosion-proof and with TÜV-certificate media combustible gases according G 260, gaseous, liquid, gelatinous, highly viscous, pasty, contaminated, aggressive, liquid fuels body materials brass, galvanized steel, nickel plated brass, nickel plated steel, without non-ferrous metals, stainless steel 1.4101 The materials refer to parts in contact with the media. seal materials NBR, PTFE, FPM, CR, EPDM, special seal materials certificates PTB (Ex), TÜV, DVGW options special threads, special flanges, function NO, damping, limit switches (NAMUR), manual override, approvals, special voltage, circuit amplifier, mounting