What is the difference between protective gate valve and copper core gate valve?

Both protective gate valves and copper core gate valves are used to cut off pipelines, and their functions are the same in this regard. Butterfly valves are generally used for protective gate valves. The operation mode of butterfly valves is 90 ° stroke, which opens and closes quickly, but the flow rate is relatively small. Protective gate valves generally have multiple turns and slow opening and closing, but have a large flow rate (can be fully opened). If the temperature is not high and the flow requirements are not high, it would be better to choose a butterfly valve. Because butterfly valves can be made with soft seals and have a low cost. Copper core gate valves are hard sealed, with lower sealing performance than soft sealed butterfly valves, and are more expensive. Copper core gate valves made by legitimate manufacturers have copper sealing surfaces for their internal components, which have a long service life and good sealing performance. But many valve manufacturers use iron or coated copper powder on the sealing surface to save costs, so when choosing valves, do not blindly choose cheap valve manufacturers. The obvious difference between protective gate valves and copper core gate valves is in the model, so when choosing a gate valve, it is important to pay attention to the correct model.