Steel ball valves with thermal insulation from polyurethane foam (PU) in a protective shell: in polyethylene (PE) shell, designed for underground laying of heat networks (channelless or in non-passable and semi-passable channels), or in steel galvanised (OC) shell - in passable channels or tunnels, as well as for above-ground laying, operating with design parameters of heat carrier (superheated water): working pressure according to the project and temperature not more than 150°C within the schedule of qualitative-quantitative regulation of heat supply 150°C-70°C.
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