What feature do cryogenic service gate valves typically have?

Cryogenic service gate valves are specifically designed to operate under extremely low temperatures, which are common in applications such as liquefied natural gas (LNG) or liquid nitrogen. One key feature that facilitates their operation in these conditions is the presence of extended bonnets.

The extended bonnet serves multiple purposes: it helps in insulating the valve body from the cold temperatures of the fluid being transported, thereby reducing the likelihood of thermal shock and maintaining the mechanical integrity of the valve components. Additionally, the extended design allows for the proper operation of the valve even when it is at very cold temperatures, ensuring that the valve can function correctly without binding or seizing due to the effects of low temperature on the materials involved.

This insulation and design detail are critical in maintaining safe and efficient operation in cryogenic systems, making the extended bonnet a crucial feature of cryogenic service gate valves.