FOUR-POSITION SWITCHING VALVE

A four-position switching valve includes first and second pistons for driving a spool in a valve body, and a spool moving mechanism part that moves the spool to first and second intermediate switching positions between one-end side and the other-end-side switching positions. The spool moving mechani...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	MATSUMURA, Kenichi
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:	A four-position switching valve includes first and second pistons for driving a spool in a valve body, and a spool moving mechanism part that moves the spool to first and second intermediate switching positions between one-end side and the other-end-side switching positions. The spool moving mechanism part includes a compression spring that moves the spool back in the opposite direction by moving to the switching position on one end side and the other end side of the spool. The compression spring moves the spool to the first intermediate switching position when the spool moves to one-end-side switching position and the pressure on the second piston is released, and moves the spool to the second intermediate switching position when the spool moves to the other-end-side switching position and the pressure on the first piston is released.