Downhole compliant dart-style reverse-flow check valve assembly

An assembly comprising a tubular housing (30), an inlet housing (28) operatively coupled to the tubular housing, a venturi housing (38) that comprises an inlet housing end, a check valve end, a venturi passageway (36) disposed along a longitudinal axis between the inlet housing and the check valve end and a valve seat at the check valve end wherein the venturi housing is at least partially received by the tubular housing and at least partially received by the inlet housing, a first spring that axially biases the venturi housing with respect to the inlet housing and the tubular housing, a dart (68), a second spring that biases the dart in a direction toward the valve seat of the venturi housing, and a check valve housing that houses the dart and the second spring and is operatively coupled to the tubular housing.