Gresswell Valves has emerged as a market leader & has a worldwide distributor base with the manufacture & supply of its bronze & stainless steel safety relief valves. These valves are supplied for various specifications to provide safety from potentially lethal over pressure Suitable for boiler systems, pumps, process, shipping, oil and gas industries and enclosed pressurised systems all Gresswell Valves safety valve range have CAT IV P.E.D. certification & CE marking.