ESCLUSIVAMENTE, IMPIEGATA IN VALVOLA A COMANDO PNEUMATICO DEL IMPIANTI DI ESSICAMENTO GAS PER TIPO NORMALMENTE CHIUSA A PORTATA ADSORBIMENTO, PER LA DECOMPRESSIONE COSTANTE AUTOCONTROLLATA, A PORTATA COSTANTE SINO A PARTICOLARMENTE MA NONPRESSIONE ATMOSFERICA DEI SERBATOI DEGLI IMPIANTI STESSI ED IL SUCCESSIVO SFIATO LIBERO APRESSIONE AMBIENTE DEL

摘要

The pneumatically actuated valve is of the type, which is normally closed, has a constant autocontrolled rate of flow and is particularly but not exclusively used in adsorption working installations for drying gases. The valve is capable of effecting a decompression at a constant rate of flow up to atmospheric pressure, and a successive venting of regenerating gases at atmospheric pressure. The valve comprises a valve member with a first orifice controlling a variable upwardly located section area of a second orifice having a fixed section area said orifices being separated by an annular chamber which is connected with one of the two section of a variable volume chamber through an axial passage of a spring-urged piston sub-diving the last-mentioned chamber in the two sections, the other section of the variable volume chamber being connected with a constant pressure pilot circuit.