Patent ID: 8313305

Claim:
A pump apparatus comprising: a pump that increases pressure of fluid in communication with the pump apparatus, the pump including a channel through which fluid flows from the pump; a motor that operates the pump; an activation assembly housing forming at least a portion of said channel; and an activation assembly positioned in the activation assembly housing, the activation assembly being movable to and from an activation position at which the motor and the pump are activated in response to a flow rate of fluid in communication with the pump apparatus, the activation assembly including a magnet housing with an integrated magnet positioned in the channel and at least one pin positioned in the channel, the at least one pin being in contact with the activation assembly housing to support the activation assembly entirely within the channel, the activation assembly pivoting about the at least one pin within the channel to move from a first position substantially perpendicular to a direction of fluid flow through the channel toward a second position substantially parallel to the direction of fluid flow through the channel, the activation position being between the first position and the second position, the activation assembly housing including an inner surface with a curved ledge extending along at least a portion of a path traveled by the activation assembly, the curved ledge preventing fluid from flowing through the channel until the activation assembly has pivoted to the activation position past the curved ledge and at least 30 degrees about the at least one pin.