Marine Type Approvals held for these valves: American Bureau of Shipping, Bureau Veritas, DNV,Germanischer Lloyd, Lloyds Register. Angular shaped spring loaded safety valves made of gunmetal with stainless steel spring and inlet body. Seal cap prevents unauthorized changing of set pressure. Suitable for the protection of pressure tanks and systems for neutral /non-neutral vapours, gases and liquids, steam boilers and steam plants. Available models: 861sGK non-gastight version with twist-type lifting mechanism, 861sGL non-gastight version with lifting lever, 861tG0 gastight for gases without lifting device, 861tF0 gastight for liquids without lifting device, 861tGF0 gastight for gases and liquids without lifting device. Available seals: PTFE up to 22 bar, PTFE + carbon from 22.1 bar up to 50 bar. All models are also available in Stainless Steel: series 461. 861sGK non-gastight version with twist-type lifting mechanism