Hastelloy (C-276/C-22) is the top material for strong acids, alkalis, and mixed corrosive media. DN65 (2.5″)gate valves are widely used in chemical, pharmaceutical, and hydrometallurgical plants. Below are 2026 price ranges and key selection parameters.The main gate valves product names of China gate Valve Network include:API Flange Gate Valve,Bevel Gear Slurry ValveElectric Rising Stem Double Disc Parallel Gate Valve,Electric Non-rising Stem Single Disc Wedge Gate Valve,Electric Rising Stem Single Disc Wedge Gate Valve,Electric Wafer Knife-shaped Gate Valve,Electro-hydraulic Wafer Knife-shaped Gate Valve

2026 Price Reference (USD, ex‑works)

Key Selection Parameters

Alloy choice – C-276 resists wet chlorine, hydrochloric acid, sulfuric acid, formic acid, hypochlorite. C-22 performs better in oxidizing acids and has higher pitting resistance.

Gate & seat – Must be full Hastelloy or Hastelloy hardfacing. Never use SS304 base – galvanic corrosion will quickly perforate.

Stem design – Rising stem preferred (stem threads away from fluid). Non‑rising available for space limits.

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

Connection standard – GB/T 9113, HG/T 20615, or ANSI B16.5. Specify flange face (RF or MFM).

Installation & Maintenance

Degrease thoroughly – residual oil may react with aggressive media.

Gasket – Use pure PTFE or graphite‑filled spiral wound. No asbestos.

Flow direction – Bidirectional, but prefer low‑in high‑out.

Long shutdown – Fully open and drain to prevent crystallisation corrosion.

Bottom line: A DN65 Hastelloy gate valve costs $2500–4150 in 2026. Select C-276, all‑metal sealing, and proper degreasing – it will last over 10 years in strong acid/alkali services.

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