What common issue can occur with solid wedge gate valves due to temperature changes?

Solid wedge gate valves are designed with a large, solid disc that acts as the sealing element. One common issue that arises with these types of valves due to temperature changes is jamming.

When temperatures fluctuate, the materials used in the valve body and the wedge can expand or contract at different rates. If the valve has been closed and the temperature increases, the solid wedge may expand more than the valve body, leading to a tight fit that prevents smooth operation. Conversely, if the temperature drops, the wedge may contract but not as much as the valve seat, also causing a jamming issue. This mechanical interference can make it difficult to open or close the valve, potentially leading to operational delays and increased maintenance efforts.

Understanding this phenomenon is crucial for anyone working with piping systems, as it helps in anticipating maintenance needs and choosing the appropriate type of valve for specific temperature conditions. It is important to note that while other issues, such as corrosion or leaking, can also occur with valves under different circumstances, the direct relationship between temperature changes and the physical interaction of the valve components is a key factor in jamming.