Patent ID: 6293759
Filing Date: 2001-09-25
Classification: B22D,F04B

Abstract:
An apparatus for pumping molten metal, comprising:a pump base comprised of non-metallic, heat resistant material and adapted to be submerged in a bath of molten metal, said pump base comprising a molten metal inlet opening; a molten metal valve chamber in communication with said inlet opening; a molten metal pumping chamber; a passageway that communicates said valve chamber and said pumping chamber, and a molten metal outlet opening that communicates with said pumping chamber;a first piston made of non-metallic, heat resistant material and adapted for reciprocal movement in said valve chamber;a second piston made of non-metallic, heat resistant material and adapted for reciprocal movement in said pumping chamber;at least one annular gasket comprised of refractory material disposed around said second piston in said pumping chamber;a first connecting member that extends upwardly from said first piston;a second connecting member that extends upwardly from said second piston; andat least one actuator in communication with said first member and said second member, wherein the at least one said actuator acts upon said first member and said second member to effect said reciprocal movement of said first piston and said second piston.