Differential type pilot overflow valve

The invention discloses a differential type pilot overflow valve to overcome the defects that impact between a pilot valve core and a pilot valve seat in the conventional pilot overflow valve is large, and the conventional pilot overflow valve is easy to damage, short in service life and large in no...

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Bibliographische Detailangaben
Hauptverfasser:	TANG YUNJUAN, GAO YINGDA
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The invention discloses a differential type pilot overflow valve to overcome the defects that impact between a pilot valve core and a pilot valve seat in the conventional pilot overflow valve is large, and the conventional pilot overflow valve is easy to damage, short in service life and large in noise. According to the pilot overflow valve, a differential pilot valve is arranged in a pilot valve cavity; the inner side of the pilot valve is provided with a first accommodation cavity which is communicated with an oil inlet, and the outer side of the pilot valve is provided with a second accommodation cavity communicated with the first accommodation cavity through a throttling hole; the pilot valve core is arranged in the pilot valve seat, and a sealing cone of the pilot valve core is positioned in the first accommodation cavity and is connected with a first buffer spring; the side of the second accommodation cavity is provided with a pressure regulating spring connected with the pilot valve seat; and a pilot v