Patent ID: 7420134
Filing Date: 2008-09-02
Classification: H01H

Abstract:
1. A float level switch comprising: a housing; an actuator shaft arranged in the housing; and a low force shaft seal assembly arranged between the actuator shaft and the housing, having a combination of disks or seals, one being made of a semi-rigid lubricious material, for maintaining a watertight seal with a substantially reduced rotational force or friction on the actuator shaft than a conventional O-ring, wherein the low force shaft seal assembly comprises: a seal cup coupled to the housing; an inboard disk or seal arranged between the seal cup and the actuator shaft and being made of the semi-rigid lubricious material; an outboard disk or seal coupled between the inboard disk or seal and the actuator shaft and being made of rubber; and a retaining ring arranged between the outboard disk or seal and the seal cup for frictionally engaging the outboard disk or seal and holding it in place.