FOUR-POSITION SWITCHING VALVE

[Object] To provide a simple-structured, easy-to-manufacture four-position switching valve.[Solution] A four-position switching valve 1 includes: a valve body 10 having a valve hole 18 communicating with a plurality of ports; a spool 30 that slides in the valve hole; first and second pistons 21 and...

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Bibliographische Detailangaben
1. Verfasser:	MATSUMURA, Kenichi
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	[Object] To provide a simple-structured, easy-to-manufacture four-position switching valve.[Solution] A four-position switching valve 1 includes: a valve body 10 having a valve hole 18 communicating with a plurality of ports; a spool 30 that slides in the valve hole; first and second pistons 21 and 22 for driving the spool; and a spool moving mechanism part 42 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 49 that accumulates an elastic force for pushing back the spool in the opposite direction as the spool moves toward the one-end-side switching position and accumulates an elastic force for pushing back the spool in the opposite direction as the spool moves toward the other-end-side switching position, and moves the spool to a first intermediate switching position with the elastic force of the compression spring when the pressure applied by the second piston is removed in a state in which the spool has been moved to the one-end-side switching position, and moves the spool to the second intermediate switching position with the elastic force of the compression spring when the pressure applied by the first piston is removed in a state in which the spool has been moved to the other-end-side switching position.