Patent ID: 6021812
Filing Date: 2000-02-08
Classification: F16K,Y10T

Abstract:
A ball plug valve, comprising: a valve body having an inlet passage and an outlet passage,a ball having a flow through hole and at least two opening ends, the ball being disposed between the inlet passage and the outlet passage,sealing members in contact with the opening ends of the ball,a valve stem in a connectable relationship with the ball,a control section connectable with the ball via the valve stem,at least one of the opening ends being an outlet end, the outlet end having a sectorial opening,the sectorial opening having a tip being disposed in a first sealing region defined by at least one of the sealing members when the valve is fully closed, and being disposed in a second sealing region defined by at least one of the sealing members when the valve is fully open,the tip passing across the outlet passage during opening and closing of the valve,the flow through hole having an inlet opening, the inlet opening having a main opening and an auxiliary opening,the auxiliary opening arranged and constructed to allow communication between the inlet passage and the flow through hole during the period the valve is beginning to open and the tip of the sectorial opening passes the first sealing region, andthe main opening is arranged and constructed to allow communication between the inlet passage and the flow through hole after the valve has begun to open.