With chromium-molybdenum alloy construction providing exceptional creep strength and oxidation resistance at temperatures up to 550℃, these valves ensure reliable system integrity where standard carbon steel valves would fail. This article provides essential pricing information and key selection parameters for DN80 chrome-molybdenum steel gate valves rated for 550℃ service.The main gate valve product names of China gate valve Network include:API Electric Lug&wafer Knife-shaped Gate Valve,API Bevel Gear Lug&wafer Knife-shaped Gate Valve,API Pneumatic Lug&wafer Knife-shaped Gate Valve,GB Bellows Wedge Gate Valve,High Temperature & pressure Power Station Gate Valve,Inside Screw Non-rising Stem Wedge Gate Valve,Insulation Jacket Gate Valve.

Price Reference for DN80 Chrome-Molybdenum Gate Valve

Prices for DN80 chrome-molybdenum steel high temperature gate valves vary based on pressure rating, connection type, and actuation:

Basic manual flanged models (Z41Y-16I/25I) with DN80 configuration are available from approximately 260 to 1,500 CNY depending on pressure rating and supplier .

Electric actuated models (Z941Y-100I) with PN10MPa rating for DN80 are quoted at approximately 3,800 CNY per unit .

Premium electric models with higher pressure ratings (up to PN16.0MPa) range from 5,800 CNY for DN80 configurations .

For welding end connections suitable for power plant service, prices for DN80 chrome-molybdenum steel gate valves range from 2,900 to 3,200 CNY .

Key factors affecting price include specific material grade (WC6 for ≤540℃ vs WC9 for ≤593℃), pressure rating (PN16 to PN160 or Class 150 to 2500), connection type (flanged vs welded), actuation type (manual, gear, electric), and certification requirements.

Material Specifications for 550℃ Service

For 550℃ service, material selection is critical to maintain structural integrity. Chromium-molybdenum alloys such as ASTM A217 WC6 (1.25Cr-0.5Mo) provide temperature capability up to 540℃, while WC9 (2.25Cr-1Mo) extends to 593℃ . Chrome-molybdenum steel gate valves with I-type material are specifically designed for operating temperatures reaching approximately 550℃ . The chromium element enhances corrosion and oxidation resistance, while molybdenum increases structural strength and creep resistance at elevated temperatures .

Technical Specifications

Pressure and Temperature: DN80 chrome-molybdenum gate valves are available in pressure ratings from PN1.6MPa to PN16.0MPa (PN16 to PN160) or Class 150 to 2500, with temperature capability up to 550℃ for standard I-type material and up to 593℃ for WC9 grade material .

Design Features: Valves feature flexible wedge design to accommodate thermal expansion, with sealing surfaces hardfaced with Stellite cobalt-chromium alloy for wear resistance and reliable sealing at high temperatures . Outside screw and yoke (OS&Y) design provides visual position indication. Pressure self-tightening bonnet construction ensures good sealing performance under high pressure and high temperature conditions .

Connections: Available with flanged ends per ANSI, DIN, or GB standards, as well as butt welding ends for power plant applications .

Standards: API 600 for gate valve design, ASME B16.34 for pressure-temperature ratings, and ASTM A217 for chrome-molybdenum steel castings.

High Temperature Applications

DN80 chrome-molybdenum gate valves serve critical functions in high temperature steam systems, main steam lines in thermal power plants (540-570℃), boiler feedwater and superheater systems, high temperature thermal oil and heat transfer fluid circuits, and refinery processes handling elevated temperature hydrocarbons .

Selection Considerations

When specifying a chrome-molybdenum gate valve for 550℃ service, verify material grade meets maximum operating temperature. For applications up to 540℃, specify WC6 material. For temperatures approaching 550℃, consider WC9 for enhanced creep resistance. Confirm pressure rating exceeds maximum system operating pressure with appropriate safety margin. Select connection type matching existing piping configuration. For critical applications, request full material test reports including high temperature mechanical property verification.

Summary

DN80 chrome-molybdenum steel high temperature gate valves are essential for reliable isolation in 550℃ service, with prices ranging from approximately 260 CNY for basic manual models to 5,800+ CNY for premium electric configurations. Chrome-molybdenum alloy construction provides the high temperature strength and oxidation resistance necessary for reliable operation at extreme temperatures. Selection requires careful evaluation of temperature rating, pressure class, and material grade. Consulting with qualified manufacturers who provide certified material test reports and performance documentation is strongly recommended for critical high temperature applications.

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