What type of stuffing box is commonly used on high pressure and temperature valves?

The lantern type stuffing box is commonly used on high pressure and temperature valves due to its design that accommodates the necessary sealing and pressure containment capabilities. This type of stuffing box allows for the use of multiple packing layers, which can be adjusted for tightness, thereby increasing its effectiveness under demanding conditions. The lantern design typically includes a space for lubrication or packing gland adjustment, enabling enhanced flexibility and the ability to handle thermal expansion and contraction, which is crucial in high temperature applications.

In high pressure situations, maintaining a reliable seal is essential to prevent leaks, and the lantern type stuffing box’s ability to be serviced or adjusted while the valve continues to operate contributes to its popularity. Its construction also provides a more robust solution compared to simpler designs, ensuring longer service life and reliability under stress.

Other options such as compression type, flange type, or single braided type do not typically offer the same level of adaptability and effectiveness for high pressure and temperature applications, making the lantern type the preferred choice in such scenarios.