Patent ID: 6758657
Filing Date: 2004-07-06
Classification: F04B

Abstract:
A pump comprising a housing, a pump chamber in said housing defined by at least one wall, an inlet area having a valve allowing fluid to be received in said chamber, an outlet area having a valve allowing fluid to be discharged from said chamber, an armature, a plunger carried by said armature, a stop surface adjacent to one end of said plunger, means to bias said plunger toward said stop surface, a diaphragm carried by the other end of said plunger and sealing said chamber, and an electromagnetic coil which when activated moves said armature to overcome the force of said means to bias so that said diaphragm is moved into said chamber without engaging said wall to discharge fluid through said outlet area, and upon deactivation of said coil, said means to bias moves said plunger toward said stop surface without engaging said stop surface to draw fluid through said inlet area and into said chamber.