Gate Valves Series

What is the difference between rising stem and non-rising stem gate valves?

A rising stem gate valve (OS&Y) has the stem threads outside the valve body, so the stem visibly rises above the handwheel when opening — providing a clear visual indicator of valve position. It is ideal for above-ground industrial service. A non-rising stem gate valve (NRS) keeps stem threads inside the body with no external stem movement, making it more compact — typically used where vertical space is limited such as underground pipelines and utility vaults. The NRS design is common in water distribution networks using AWWA standards.

What are gate valves used for?

Gate valves are primarily used for on/off isolation — fully open or fully closed — in pipelines where minimal pressure drop is required. Common applications include: oil & gas trunk pipeline isolation, refinery unit block valves, power plant steam and feedwater isolation, municipal water distribution mains, fire protection system main valves, chemical plant reactor isolation, tank farm manifold valves, and mining slurry pipeline isolation. Gate valves provide bi-directional tight shut-off with minimal flow resistance when fully open.

Can a gate valve be used for throttling?

No. Gate valves are designed for on/off service only and should not be used for throttling. When a gate valve is partially open, high-velocity flow across the gate and seat causes accelerated erosion, vibration, wire-drawing of the seat surface, and premature failure. The gate disc and seat can be permanently damaged by the resulting turbulence and cavitation. For flow regulation or throttling, use a globe valve, control valve, or butterfly valve specifically designed for that service.

What materials are TANGGONG gate valves available in?

TANGGONG manufactures gate valves in a wide range of materials to suit various service conditions: cast carbon steel (ASTM A216 WCB) for general oil & gas and water service; chrome-molybdenum alloy steel (ASTM A217 WC6, WC9) for high-temperature refinery and power plant steam service; cast austenitic stainless steel (ASTM A351 CF8/SS304, CF8M/SS316, CF3M/SS316L) for corrosive and low-temperature applications; forged carbon steel (ASTM A105) and forged stainless steel (ASTM A182 F304, F316) for high-pressure small-bore applications; ductile iron and cast iron for waterworks and non-critical services. Seat options include metal-to-metal (13Cr/Stellite), resilient (EPDM/NBR), and stellite hard-faced overlay for severe service.

What is the lead time for gate valve orders?

Standard gate valve orders from our in-stock inventory are typically shipped within 3–7 business days — this covers common sizes in WCB/CF8 from DN50 to DN300 (2" to 12"), Class 150 and Class 300. Custom material grades, special trim configurations, large-diameter valves (DN350+), or bulk orders typically require 4–8 weeks depending on material availability, testing requirements, and order quantity. For project-specific lead times, please contact our sales team at [email protected] with your datasheet or valve schedule.