The diameter (or diameter) of a full bore ball valve refers to the universal diameter of various pipes and pipeline accessories. Pipes with the same diameter and pipeline accessories can be connected to each other and have interchangeability. It is not the actual outer diameter or inner diameter of the pipeline, although its value is relatively close to or equal to the inner diameter of the pipeline. In process piping systems, most valves are designed to limit the flow of closed components to a certain range by making the flow channel or area smaller than the inner diameter of the pipeline. Some ball valves can be designed with sufficient internal flow channels to allow logistics to pass through without obvious restrictions. This type of ball valve is called a full bore ball valve because its internal flow channel is equal to the full area of the inlet. Full bore ball valves are mainly used for switching and circuit breaking conditions.

Reduced bore ball valve is a closed element valve that controls flow. The flow area of the opening of the closed component is smaller than the area of the inner diameter of the pipeline. The main purpose of a reduced diameter ball valve is to control flow by reducing or intercepting flow, which is equivalent to adjusting the sealing element to provide different flow rates at a certain opening of the valve.

The main difference between full bore ball valves and reduced bore ball valves is that the full bore ball valve has an equal width flow channel, and its size cannot be less than the standard specified value, which is roughly equivalent to the nominal diameter of the specification. For example, the flow channel diameter of a DN50 full bore ball valve is about 50mm; The inlet of the flow channel of the reduced diameter ball valve is wider than the diameter of the flow channel, and the actual diameter of the flow channel is about one specification smaller than this specification. For example, when a DN50 reduced diameter ball valve flows to a diameter of about 38, it is roughly equivalent to the specification of DN40. The key is that its diameter should be consistent with its nominal specifications, not just the channel remains unchanged, so your second understanding is correct.