Patent ID: 7605336
Filing Date: 2009-10-20
Classification: H01H

Abstract:
1. A pressure switch, comprising: a housing having a piston cavity formed therein; a piston movably disposed in the piston cavity, the piston movable, in response to a media pressure being applied to a surface thereof, between at least a first piston position and a second piston position; a conical disc spring disposed in the housing and supplying a non-linear spring force to the piston that urges the piston toward the first position and at least inhibits movement of the piston to the second piston position until the media pressure is greater than or equal to a predetermined set pressure value, the conical disc spring further supplying a preload force to the piston when the piston is in the first position; and an adjustable spring retainer movably disposed within the housing, the adjustable spring retainer movable to a plurality of positions to thereby adjust the preload force supplied from the conical disc spring to the piston.