Annulus check valve

The invention provides an annulus check valve. The annulus check valve comprises a lower connector, the lower connector comprises a first tubular section and a second tubular section, the external diameter of the second tubular section is larger than that of the first tubular section, and the tube w...

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Bibliographische Detailangaben
Hauptverfasser:	QIAO RONGNA, XING DEGANG, LIU JIANGUO, YANG JUNHU, SHAN LIXIA, TANG CHENGHUI, HU YINGCAI, LIU XIAOYONG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	The invention provides an annulus check valve. The annulus check valve comprises a lower connector, the lower connector comprises a first tubular section and a second tubular section, the external diameter of the second tubular section is larger than that of the first tubular section, and the tube wall of the second tubular section is provided with a flow passing hole parallel to the lower connector. The annulus check valve further comprises a flow passing channel used for making the flow passing hole and the inside of the lower connector communicated, and a check valve body only allowing a flowing medium to flow into the lower connector from the outside of the lower connector is arranged in the flow passing hole. The external diameters of the first tubular section and the second tubular section on the lower connector are different, the external diameter of the second tubular section is larger than that of the first tubular section, the flow passing hole and the flow passing channel make the inside and the ou