What is the difference between a rising stem gate valve and a non rising stem gate valve?

Stem visibility:

Rising stem gate valve: the stem is exposed on the outside of the valve body, the stem lifts with the gate synchronously when opening and closing, and the valve status can be judged by observing the position of the stem. Non rising stem gate valve: the valve stem is hidden inside the valve body, only through the rotation of the valve stem to drive the lift of the gate, can not directly observe the degree of opening and closing

Transmission mechanism:

Rising stem gate valve: handwheel is fixed, and the rotation of the valve stem is converted into the vertical movement of the gate plate through thread transmission.

Non rising stem gate valves: handwheel and stem rotate synchronously, through the internal thread to achieve the gate lift, without the need for external lift space.

Installation Requirements:

Rising stem gate valve: increased height when fully open, need to reserve a larger vertical installation space (such as overhead piping).

Non rising stem gate valve: compact, suitable for underground pipework or confined areas.

Typical applications:

Rising stem gate valve: small flow, low pressure scenarios (such as home water, fire fighting network), rely on manual operation and require frequent maintenance.

Non rising stem gate valves: high-pressure industrial systems (e.g. petrochemical, metallurgical), often used in conjunction with automated control devices.

Performance comparison: