Hastelloy (C-276/C-22) is the top choice for strong acids (hydrochloric, sulfuric, hydrofluoric), alkalis, and mixed corrosive media. DN65 (2.5″) is common in chemical, pharmaceutical, and hydrometallurgical plants.The main gate valves product names of China gate Valve Network include:Rising Stem Double Disc Parallel Gate Valve,Rising Stem Wedge Single Disc Gate Valve,Stainless Steel Wire Port Gate Valve,Sprocket Wafer Knife-shaped Gate Valve,Sprocket Slurry ValveSCZ Series Flashboard Valve,Slab Gate ValveScum Flange Gate Valve,Stainless Steel Flange Gate Valve,Wafer Bevel Gear Knife-shaped Gate Valve

2026 Price (RMB, incl. tax)

Material Pressure     Connection    Seat            Price (RMB)

C-276 PN16 Flanged Metal            hardfaced 18,000–25,000

C-276 Class 150   Flanged               ANSI Metal 20,000–27,000

C-22          PN16   Flanged           Metal hardfaced 21,000–28,000

C-22 costs slightly more but offers better pitting resistance in oxidizing acids. Bulk orders (3+ pcs) save 10–15%.

Key Selection

Alloy: C-276 resists wet chlorine, hydrochloric acid, sulfuric acid; C-22 better for oxidizing acids.

Gate/seat: Full Hastelloy or Hastelloy hardfacing – never use SS304 base (galvanic corrosion).

Stem: Rising stem preferred (threads away from media). Non‑rising for space limits.

Temp range: C-276: -196°C to 400°C. Derate at high temperature.

Flange standard: GB/T 9113, HG/T 20615, or ANSI B16.5. RF or RTJ facing.

Installation & Maintenance

Degrease thoroughly – residual oil reacts with aggressive media.

Gasket: Pure PTFE or flexible graphite spiral wound. No asbestos.

Isolation: Use insulating gaskets when connecting to carbon steel to prevent galvanic corrosion.

Operation: Close gently – never use a cheater bar.

Procurement Checklist

DN65, pressure PN16 or Class 150

Material C-276 or C-22 (certificate required)

Full Hastelloy seat (hardfacing ≥1.5mm)

Flange standard & bolt circle

NACE MR0175 or class society certification if needed

Bottom line: A DN65 Hastelloy gate valve costs RMB 18,000–28,000 in 2026. Select C-276 + all‑metal sealing + proper degreasing – it will last over 10 years in strong acid/alkali service.

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