CN7M National Standard Flange Gate Valve

Description

CN7M (Alloy 20 / ASTM A351 CN7M) is a “super” stainless steel that contains high levels of nickel, chromium, and molybdenum, along with copper:

• Superior Sulfuric Acid Resistance: The addition of Copper provides excellent resistance to sulfuric acid across a wide range of concentrations and temperatures.
• Corrosion Immunity: Offers outstanding protection against intergranular corrosion, pitting, and crevice corrosion in chloride-rich and acidic environments.
• Stress Corrosion Cracking (SCC) Defense: High nickel content (approx. 33–37%) ensures the valve is virtually immune to chloride-induced stress corrosion cracking.

Features

• GB Standard Compliance: Manufactured to GB/T 12234, GB/T 9113, and GB/T 12221 specifications, ensuring standardized dimensions and reliable performance for domestic chemical infrastructure.
• Full Bore Flow: The gate retracts completely into the bonnet, providing an unobstructed flow path that minimizes pressure loss—essential for high-volume chemical transfers.
• Flexible Wedge Sealing: The wedge-type gate ensures a tight, bubble-proof seal, compensating for minor seat deviations and ensuring safe isolation of hazardous chemicals.
• Outside Screw and Yoke (OS&Y): The rising stem design keeps the operating threads away from the corrosive media, ensuring long-term operational smoothness and preventing thread seizure.

Specifications

Applications

• Chemical Processing: Handling sulfuric acid, phosphoric acid, and nitric acid.
• Petrochemical: Refineries using aggressive acid catalysts.
• Food & Pharmaceutical: Environments where superior corrosion resistance is needed to prevent metallic contamination.
• Plastics & Synthetic Fiber: Production lines involving harsh chemical monomers and acidic byproducts.