Gate Valves for Industrial Pipeline Isolation

Rising stem or non-rising stem?
The main difference is headroom requirement and visual position indication. A rising stem valve requires clearance above the handwheel equal to the full stroke length of the stem, but allows operators to see instantly whether the valve is open or closed by the stem position. A non-rising stem valve needs no overhead clearance and is the standard choice for underground or buried service, valve pits, and installations with limited ceiling height. If visual position indication is important for your operation, rising stem is the more practical choice.

Flanged, threaded or welded connection?
Flanged gate valves are used in main pipelines where the valve needs to be bolted securely between flanges and may need to be removed for inspection or replacement. Threaded connections are suitable for smaller branch lines and low-to-medium pressure service where installation flexibility is important. Welded connections provide a permanent, leak-proof joint and are used in high-pressure or high-purity systems where a mechanical connection is not preferred.

Which body material?
WCB carbon steel covers most general service applications including water, steam, oil, and gas at moderate temperatures. SS304 (CF8) provides improved corrosion resistance for mildly aggressive media and clean water systems. SS316 (CF8M) is recommended where greater resistance to chlorides or stronger chemicals is required. For cryogenic or low-temperature service, specialized low-temperature carbon steel grades are available on request.