Abstract: Disclosed is a flow sensing check valve comprising an outer shell; an inner sleeve mounted in the outer shell and having a first port at one end, a second port at the other end, and a third port axially located intermediate the other two near the first port; a poppet valve urged into valving engagement with the first port, the poppet valve being in sealing engagement with the interior of the inner sleeve between the second and third ports and having a pilot flow control passageway therethrough; and a velocity fuse mounted in the second port. When the velocity fuse senses a pre-selected difference in flow, it causes the poppet valve to seat.