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
Lead=in cut=out valve junction piece for water meter - has housing connected to lower part of valve by riser led inside to form coaxial double tube for supply and discharge flow