Annular suction valve

摘要

An annular suction valve includes a substantially tubular member having an inner surface defining a valve flow passage having an inlet, a nozzle disposed in the inlet and spaced from the inner surface so as to define an annular passage between the inner surface and the nozzle, the nozzle further defining an interior flow passage and having a nozzle inlet to the interior flow passage; and a power fluid inlet in one of the nozzle and the tubular member for receiving power fluid into the annular passage.