Patent ID: 6971625
Filing Date: 2005-12-06
Classification: F16K

Abstract:
1. A valve assembly comprising a valve body with an inlet and an outlet port, a partition wall having a valve seat separating said valve body into a first flow passage and a second flow passage; a piston, having a throughbore including an orifice, reciprocably mounted in said valve body, said piston being gradually movable between a first position and a second position; a modulating plug in conjoining contact with said piston, reciprocably mounted in said valve body and gradually movable between an open position, permitting fluid flow from said first flow passage to said second flow passage, and a closed position engaging said valve seat, blocking fluid flow from said first flow passage to said second flow passage; a valve cover adjoining said valve body; and a throttling member connected with said valve cover and extending into said througlibore and substantially closing said orifice, adapted to insure a gradual alteration of the cross-sectional area of said orifice upon reciprocation of said piston between said first and second positions.