Marine Type Approvals held for these valves: American Bureau of Shipping, Bureau Veritas, DNV, Germanischer Lloyd, Lloyds Register. Overflow and control valves made of gunmetal with stainless steel spring. Suitable for liquids, steam and gaseous media. Available models: 618 sGF0 Non-gastight version without lifting lever, 618 tGF0 Gastight version , 618 sGFL Non-gastight version with lifting lever. Available seals: NBR , PTFE. Ranges of adjustment: 0.2 – 0.8 bar, 0.5 – 2.5 bar, 2.0 – 12 bar, 12 – 20 bar with PTFE seal. Valves can be delivered unset within a pressure range or set and sealed at the factory.