Patent ID: 6895988
Filing Date: 2005-05-24
Classification: G05D,Y10T

Abstract:
1. A fluid operated control valve for controlling fluid flow of a system, the control valve comprising: a hollow casing with closed first and second ends; a piston member slidably disposed within the casing and defining thereby within the casing a first chamber and a second chamber, each chamber having a volume variable depending upon the position of the piston member; a first magnetic member disposed adjacent the first casing end for attracting the piston member to a first terminal position; a second magnetic member disposed adjacent the second casing end for attracting the piston member to a second terminal position; an input port disposed adjacent to an intermediate location in the casing for receiving operating fluid thereto; a first output port disposed in the casing in fluid communication with the first chamber; a second output port disposed in the casing in fluid communication with the second chamber; and a passageway for alternately guiding the operating fluid from the input port to the first chamber and the second chamber depending upon the position of the piston member within the casing, the position of the piston being reciprocally moveable between the two terminal positions when pressure difference between a pressurizing chamber and the other chamber reaches a pressure overcoming attracting force between the piston member and the one then-holding magnetic member.