Patent ID: 6621021
Filing Date: 2003-09-16
Classification: H01H

Abstract:
A differential pressure switch comprising:a piston housing having a cylinder bore therein; a piston having a piston head at one end, a piston tip at an opposite second end, and a tapered piston shaft between the piston head and the piston tip, the piston being guided for reciprocal movement in the cylinder bore of the piston housing; a switch element, switching of which being triggered by movement of the piston and a return element for applying a return force toward the piston head of the piston; wherein the piston head has a pressure P1 applied to it and a bore space of the cylinder bore around the tapered piston shaft has a pressure P2 applied to it; where the piston tip is positioned to act on the switching element and is sealed off in relation to said bore space of the cylinder bore by a rolling diaphragm which is movable within a range of said movement of the piston.