1. There is a part inside the gate valve, which can move up and down to close the flow, metal to metal. The globe valve uses a rubber gasket to seal the flow. The gate valve may have a rising or non-rising stem, while the globe valve is usually a rising stem design. globe valve symbol: The gate valve symbol is J. Gate valve symbol: The gate valve symbol is Z.
2. The gate valve is mainly used for cutting off in the pipeline. Generally, the cut-off device with a diameter of DN≥50mm is mostly used, and sometimes the gate valve is also used for the cut-off device with a small diameter. The globe valve is mainly used for cutting off in the pipeline. The nominal diameter of the globe valve is limited to DN≤200mm. The fluid resistance loss of the shut-off valve is relatively large.
3. The use of the globe valve is more common, but due to the large opening and closing torque and the longer structure length, it limits the wider use of the globe valve. The throttle valve is mainly used for throttling in the pipeline
4. In the process of opening and closing, the friction of the sealing surface of the globe valve is smaller than that of the gate valve, it is wear-resistant, and the opening height is small. The gate valve requires less external force to open and close. When fully opened, the sealing surface is less eroded by the working medium than the globe valve, the body shape is relatively simple, and the casting process is better.
