DOUBLE BALL VALVE FOR FLOW CONTROL TO PREVENT LEAKAGE CAUSED BY WEAK SEALING BETWEEN A VALVE BODY AND A VALVE BALL

摘要

PURPOSE: A double ball valve for flow control is provided to easily control flow rate to the preset value because a sub valve call is installed inside a main valve ball so that the main and sub valve balls are independently operated.;CONSTITUTION: A double ball valve for flow control comprises a valve body, a main valve ball, a sub valve ball(40). The valve body has a longitudinal internal passage. The main valve ball comprises an opening(32) formed from the front to the back and is arranged in the internal passage of the valve body. The sub valve ball is located inside the main valve ball and has a first opening(42) formed from the front to the back corresponding to the opening of the main valve ball and a second opening(44) formed from side to side with a smaller diameter than the opening of the main valve ball.;COPYRIGHT KIPO 2011