he dual channel long column plug sand pump..

This pump is a tubular pump with anti air lock and anti sand jamming capabilities It adds a ring valve device on the basis of the conventional tubular oil pump The ring valve is fitted on the valve stem with a small gap, and the frictional force generat..

Double sealed anti air rod pump..

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API standard oil well pump refers to a conventional oil well pump that complies with the American Petroleum..

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