Pump having pistons and valves made of electroactive actuators

A pump for inducing a displacement of a fluid from a first medium to a second medium, comprising:

• a conduit coupled to said first and second media;
• a first transducing material valve mounted in said conduit and transversely displaceable from a closed position to an open position to admit said fluid to said chamber;
• a transducing material piston defining a pump chamber in said conduit between said first valve and said second medium and transversely displaceable from a first position to a second position to extract said fluid from said first medium into said chamber and from said second position to said first position to force said fluid from said chamber to said medium;
• and
• control means for changing a first field applied to said piston to displace said piston and for changing a second field applied to said first valve to change the position of said valve.

A pump for inducing a displacement of a fluid from a first medium to a second medium, comprising:

• a conduit coupled to said first and second media;
• a transducing material piston defining a pump chamber in said conduit and being transversely displaceable, said piston comprising means for changing a volume of said chamber;
• a transducing material valve mounted in said conduit between said piston and said first medium and transversely displaceable from a closed position to an open position;
• and
• control means for changing fields applied to said piston and said valve in a predetermined sequence to alternately extract said fluid from said first medium into said chamber and to force said fluid from said chamber into said second medium.