PRESSURE REGULATOR FOR GAS TRANSPORT AND DISTRIBUTION PLANTS

摘要

The invention relates to a gas pressure regulator (1) comprising: at least a valve (2), a delivery duct (4) of low pressure gas (Pb), a regulation shutte r (5) for the gas delivery flow, a control head (8) of said valve (2) defining an upper chamber (9) and a lower chamber (10); a pilot valve (12) for controlling the movement of said shutter (5) in which there is a first chamb er (13) with an inlet way (14), a first outlet way (18) communicating with said delivery duct (4) and a second chamber (16) in which there is the body of an interception shutter (17) adapted to open or close said inlet way (14). The invention is characterized in that said first chamber (13) has at least a second outlet way (11) communicating with said lower chamber (10) and said upper chamber (9) and said inlet way (14) are connected to each other throug h an auxiliary duct (15) containing gas at an intermediate pressure (Pm) betwe en said high pressure (Pa) and said low pressure (Pb).