Selling Cheap Ball Valves from PT Inovasi Sinergi Jaya in Jakarta. Ball Valve is one type of valve with a flow control shaped like a round disc (like a ball / hemisphere). The ball has a hole, which is in the middle so that when the hole is in a straight line or in line with both ends of the valve, flow will occur. But when the valve is closed, the hole position is perpendicular to the end of the valve, the flow will be blocked or closed.