Chemical Industry Nickel Alloy Forged Gate Valve

Nickel alloy forged gate valve for Chemical Industry is a specialty control valve custom-designed for severe chemical industry conditions involving strong corrosion, high temperature, and high pressure. It combines the superior corrosion resistance of nickel alloys, the structural strength of forged construction, and the reliable on/off performance of gate valves. It is suitable for critical chemical processes such as reactions, media transport, and system isolation. The valve provides outstanding corrosion resistance, pressure and wear endurance, and stable sealing, effectively addressing issues such as corrosion-induced leakage, structural deformation, and short service life, ensuring safe and continuous operation of chemical production systems.

Structural design focuses on three adaptations for chemical conditions:

• Valve body: Made from high-quality corrosion-resistant nickel alloys such as Monel (400/K-500), Hastelloy (C-276/C-22), or Inconel (625/825), formed by integral forging. The dense forging structure contains no porosity or sand holes, with mechanical strength over 35% higher than cast valves, able to withstand long-term exposure to highly corrosive media and high-pressure impact.

• Wedge gate structure: With a wedge angle of 3°–5°, the gate is integrally forged from the same nickel alloy as the body, solution-treated and precision-ground. Sealing surfaces are overlaid with Stellite 6 or cobalt-based hard alloy (hardness ≥ HRC60), forming a “nickel alloy base + hard seal” composite structure for enhanced wear resistance and corrosion protection.

• Sealing assembly: Designed with “metal hard seal + elastic compensation,” using nickel-alloy-based seats overlaid with hard alloy and Inconel spring preloading to automatically compensate for temperature deformation and sealing surface wear. Leakage meets ANSI B16.104 Class V.

• Stem: Integrally forged from nickel alloy, nitrided, and sealed with dual packing of flexible graphite and PTFE to prevent stem leakage. Actuation options include manual, electric (explosion-proof), and gear-driven, adapting to various chemical field control requirements.

Key technical parameters:

• Nominal diameter: DN25–DN400 (1"–16")

• Pressure rating: PN10–PN420 (Class 150–2500 LB)

• Operating temperature: –196 °C to 600 °C (low temperatures suitable for cryogenic chemical media, high temperatures suitable for chemical reactor service)

• Corrosion resistance: NACE MR0175/MR0103, suitable for strong acids and bases (pH 0–14), Cl⁻/H₂S/CO₂-containing media, and organic chemical solvents

• Connections: Flanged (ASME B16.5, GB/T 9113), butt-welded; sealing surfaces support RF and RTJ types for chemical piping systems

Manufacturing and testing strictly follow API 6D, ASME B16.34, and API 598 standards. Each valve undergoes corrosion immersion testing, hydrostatic pressure testing, sealing performance evaluation, and non-destructive inspection (UT/RT/MT) to ensure suitability for severe chemical service conditions.

Performance advantages:

1. Broad-spectrum corrosion resistance – nickel alloy material withstands diverse corrosive chemical media, with service life 5–8 times longer than standard stainless steel gate valves.

2. Superior structural strength – integral forging provides excellent resistance to pressure and impact, eliminating deformation and leakage risk.

3. Stable and reliable sealing – hard-seated design with elastic compensation ensures reliable operation under frequent cycling and process fluctuations, maintaining zero leakage over long-term operation.

Applications: Suitable for transporting chemical acid/base solutions, handling sulfur-containing petrochemical media, fine chemical reactions, and seawater desalination in marine chemical plants. Typical installations include chemical reactor inlets/outlets, petrochemical hydrogenation units, acid/base storage tank outlets, and chemical distillation tower pipelines under highly corrosive conditions, serving as critical control equipment for ensuring system stability in harsh chemical environments.