Patent ID: 6357480
Filing Date: 2002-03-19
Classification: B60T,F15B,Y10T

Abstract:
A valve, comprising:a housing; and a piston member, said piston member being mounted in said housing so that said piston member moves between first and second positions; wherein said housing includes: a piston chamber for guiding said piston member between said first and second positions while keeping a sealing engagement with said piston chamber; first and second chambers adjacent to opposite ends of said piston member, volumes of said first and second chambers being changed depending upon a movement of said piston member; first to third ports, said first and second ports being connected when said piston member takes said first position but disconnected when said piston member takes said second position, said third port being connected with said first and second chambers and being disconnected from said first and second ports when said piston member takes said first position but connected with said second port when said piston member takes said second position; a partition defined between said first and second chambers, said partition having an orifice extending therethrough to connect between said first chamber and said third port; and wherein said piston member has a channel, said channel connecting between said first port and said second chamber when said piston member takes said first position.