SUPREME AQUA GOLD MOULDED PIPE FITTING BALL VALVE (SOL. WELD) PLASTIC BALL - SCH80 BALL VALVE (SOL. WELD) PLASTIC BALL (Size-65mm) - A PVC ball valve, also known as polyvinyl chloride, is a on and off plastic valve with a rotating ball that has a bore where turning the ball a quarter turn can halt the flow of a fluid. They can be used to control the flow of water, air, corrosive chemicals, acids, and bases. They are also very cost-effective and long-lasting.