Patent ID: 8753097

Claim:
A multi-stage pump comprising: a dispense block defining a pump inlet flow path, a pump outlet flow path, at least a portion of a feed chamber and at least a portion of a dispense chamber, a flow path from the feed chamber to a first dispense block filter port and a flow path from a second dispense block filter port to the dispense chamber; a feed stage diaphragm movable in the feed chamber; a dispense stage diaphragm movable in the dispense chamber; a feed stage piston contacting the feed stage diaphragm; a dispense stage piston contacting the dispense stage diaphragm; a feed stage motor coupled to the feed stage piston; a dispense stage motor coupled to the dispense stage piston; a quick change filter manifold configured to allow replacement of filters without screws, the quick change filter manifold comprising spaced guides rotatable relative to the dispense block; a noncompliant disposable filter for high viscosity fluid in a flow path between the feed stage and the dispense stage, the noncompliant disposable filter comprising: a bowl portion at least partially defining a filter cavity sized to fit between the spaced guides; a head portion compatible with the quick change filter manifold, the head portion sized to rest on the spaced guides and the head portion comprising an inlet port and an outlet port, wherein the inlet port is configured to mate with the first dispense block filter port and the outlet port is configured to mate with the second dispense block filter port, and wherein the spaced guides are configured to rotate to couple and decouple the noncompliant disposable filter from the dispense block without screws; and a set of valves to selectively allow fluid flow through the multi-stage pump.