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. Internal parts are made of gunmetal and sea-water resistant. Suitable for the protection of pressure tanks and systems for non-neutral and neutral gas, steam and liquids, and of steam boilers. Also suitable for combustible and toxic gas, steam and liquids. Available three models in: Gunmetal with Stainless Steel Spring: 852, Stainless Steel: 452 , Spheroidal Graphite Cast Iron: 352. - Model 852/452/352 tGFO gastight without lifting device, - Model 852/452/352 tGFL gastight with lever for lifting, - Model 852/452/352 bGFO gastight with bellows without lifting device, - Model 852/452/352 bGFL gastight with bellows with lever for lifting. Available seals: - NBR, - EPDM, - FKM, - PTFE, - PTFE+carbon (standard from 25 bar), - FFKM, - metal-to-metal sealing Model 452bGFL: Gastight with Bellows and Lever for Lifting