What is the primary advantage of using Non Rising Gate Valves over Rising Stem Gate Valves?

The primary advantage of using Non Rising Gate Valves over Rising Stem Gate Valves is that they require less headroom. Non Rising Gate Valves are designed so that the stem does not rise when the valve is opened or closed. This design permits installation in situations where vertical space is limited, as the stem remains completely enclosed within the valve body.

In applications where height is a constraint, for example in underground systems or in facilities with low ceilings, the use of Non Rising Gate Valves allows for proper valve operation without requiring additional clearance for the rising stem. This makes them particularly useful in confined spaces or areas where overhead restrictions may be present.

This characteristic does not necessarily mean that these valves are easier to maintain or lighter in weight; the maintenance requirements and weight are influenced by other factors such as the material of construction and design specifications. While the other options may have their own merits, the key differentiator for Non Rising Gate Valves is their requirement for less headroom.