2-PORT VALVE FOR VACUUM PRESSURE

PROBLEM TO BE SOLVED: To provide a 2-port valve which can gently release a flow passage extending between two port parts without the occurrence of a rapid flow rate change in a way that a valve seat is released in stages by phasedly driving a valve member by two pistons. SOLUTION: A first piston 24...

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Bibliographische Detailangaben
1. Verfasser:	KAJITANI MASAO
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a 2-port valve which can gently release a flow passage extending between two port parts without the occurrence of a rapid flow rate change in a way that a valve seat is released in stages by phasedly driving a valve member by two pistons. SOLUTION: A first piston 24 for initial release, a sleeve 35 to stop the first piston 24 in an initial release position, and a second piston 37 slidably situated in the sleeve 35 and coupled to a valve shaft 11 extending from the valve member 4 are situated in a piston chamber 23 of a cylinder part 2 for driving the valve member 4. At the early stage of the valve member 4, the valve member 4 is slightly released by driving the second piston 37 to an initial release position by the first piston 24 and thereafter, the valve member 4 is moved to a full opening position by independently driving the second piston 37. COPYRIGHT: (C)2006,JPO&NCIPI