F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
F16K27/00—Construction of housing; Use of materials therefor
F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
F16K27/062—Construction of housing; Use of materials therefor of taps or cocks with conical plugs
Procede pour la fabrication d'une surface de chauffe d'une chaudiere exempte de condensation d'eau, composee d'une enveloppe interieure et d'une enveloppe exterieure, et surface de chauffe fabriquee par ce procede