What are the two main types of gate valves?

The two main types of gate valves are distinguished by the way the valve stem operates in relation to the gate itself. In the case of rising stem gate valves, the stem moves upward as the valve opens, allowing for a visual indication of the valve position. This design is typically employed in applications where it’s important to monitor the valve status easily.

On the other hand, non-rising stem gate valves do not have the stem move upward when opening; instead, the gate is raised and lowered by turning the stem. This type is often used in applications where space is limited, as it doesn't require the stem to extend above the valve itself. These characteristics make the rising and non-rising stem distinctions fundamental to gate valve classification, as they influence the valve’s application, installation, and maintenance requirements.

Understanding these two types is crucial for selecting the right valve for specific applications, ensuring operational effectiveness, and maintaining system efficiency.