Monel Alloy Gate Valve DN50 Price for Hydrofluoric Acid Media
With Monel 400's exceptional resistance to hydrofluoric acid at all concentrations and temperatures, these valves provide reliable shutoff where standard stainless steel would rapidly fail . This article provides essential pricing information and key selection parameters for DN50 Monel gate valves for HF media applications.The main gate valve product names of China gate valve Network include:API Flange Gate Valve,Bevel Gear Slurry Valve,Electric Slurry Valve,Electric Flange Gate Valve,Forged Steel Flange Gate Valve,GB Bellows Wedge Gate Valve,Manual Knife-shaped Gate Valve,Manual Slurry Valve,Manual Wedge Copper Gate Valve.
Price Reference for DN50 Monel Gate Valve
2026 prices for DN50 Monel gate valves vary based on pressure rating and configuration:
Class 300, flanged, DN50: approximately $625 to $1,100 USD (4,500–8,000 CNY) ex-works . This range reflects the three-to-five times cost premium of Monel over 316 stainless steel due to nickel market pricing and challenging machining characteristics .
Class 600, flanged, DN50: approximately $1,080 to $1,500+ USD.
Class 1500 forged, socket weld: premium pricing for high-pressure configurations.
Domestic market reference pricing ranges from approximately 3,050 to 4,800 CNY for PN16-PN25 configurations, with a specific Monel gate valve quoted at 4,800 CNY . Note that many online B2B listings use virtual pricing; verified supplier quotes should be obtained.
Key factors affecting price include pressure class (Class 150 to Class 1500), configuration (cast vs forged), NACE MR0175 compliance, third-party inspection (Lloyd's, BV, TÜV), and documentation requirements (EN 10204 3.1 Material Test Reports).
Why Monel for Hydrofluoric Acid Service
Monel alloy, specifically UNS N04400 (Monel 400), is the industry standard material for hydrofluoric acid alkylation units in oil refineries . The high nickel (approximately 66%) and copper (approximately 31%) content provides inherent resistance to reducing acids, particularly hydrofluoric acid at all concentrations up to the boiling point . Monel also offers immunity to chloride stress corrosion cracking, a common failure mode for 316 stainless steel in chloride-containing HF service .
Technical Specifications
DN50 Monel gate valves feature rising stem (OS&Y) design with bolted bonnet construction . Body materials include ASTM A494 M35-1 cast Monel or ASTM B564 UNS N04400 forged Monel . Stem is solid age-hardened K-Monel 500 for increased strength and corrosion resistance . Seats are single seal welded-in Monel with Stellite hardfacing for wear resistance. Temperature range from -196°C to +480°C .
Selection Considerations
When specifying a DN50 Monel gate valve for HF service, verify Monel grade compatibility with your specific HF concentration, temperature, and system pressure. Specify NACE MR0175 compliance for sour service applications. Request 100% Positive Material Identification (PMI) verification and EN 10204 3.1 Material Test Reports. For critical refinery HF alkylation units, consider valves with HF acid-detecting paint for immediate visual leak detection .
Summary
DN50 Monel gate valves are essential for reliable isolation in hydrofluoric acid service, with 2026 prices ranging from approximately $625 USD for Class 300 configurations to over $1,500 USD for high-pressure models. Monel 400's exceptional resistance to HF corrosion ensures long service life where 316 stainless steel would rapidly fail. Selection requires careful evaluation of pressure class, configuration, and NACE compliance based on specific service conditions. For critical HF applications, consulting with qualified manufacturers who provide certified material test reports and PMI verification is strongly recommended.
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