Air pressure self-balancing check valve

The invention discloses an air pressure self-balancing check valve used for liquid drainage of a well liquid gaining machine with a gas well. The structure includes that a valve plate is provided with a plurality of valve pins, the upper end of each valve pin is provided with a seal ring and is arra...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHU LIANLI, ZENG LIZHAN, LI XIAOQING, ZHENG XIAOCHUN, YAN KEHAN
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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