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Factory Direct Sales Rhd Carbon Steel Check Valve. High Pressure Capacity: Pressure range up to 420 bar or 6000 PSI for demanding hydraulic applications. Multiple Thread Options: Available with NPT, SAE, BSP, ORFS, and Metric thread connections. Premium Surface Treatment: White zinc or zinc-nickel alloy coating for enhanced corrosion resistance. OEM and ODM Services: Customization available for logo labeling, manufacturing from samples, and blueprints. ISO Certified Quality: Manufactured under ISO9001:2000 standards with 100% leakage and functionality testing.