Standard carbon steel (ASTM A216 WCB) becomes dangerously brittle below -29 degree Celsius, making low temperature steel grades LCB and LCC mandatory for these applications . This article provides essential pricing information and key selection parameters for DN150 low temperature steel gate valves for -46 degree Celsius service.The main gate valve product names of China gate valve Network include:MZ44W Rising Stem Gas Quick Open&close Parallel,MZ48W Manual Non-rising Stem City Gas Quick Gate Valve,Electric Wafer Knife-shaped Gate Valve,Electro-hydraulic Wafer Knife-shaped Gate Valve,Electric Slurry Valve,Electric Flange Gate Valve,Sprocket Slurry Valve,SCZ Series Flashboard Valve.

Price Reference for DN150 Low Temperature Steel Gate Valve

2026 prices for DN150 low temperature steel gate valves vary based on material grade and pressure rating :

LCB material, PN16, flanged: approximately $440 to $625 USD ex-works

LCB material, Class 150, flanged (ANSI): approximately $500 to $695 USD

LCC material, PN25, flanged: approximately $585 to $805 USD

LCC material, Class 300, flanged: approximately $765 to $1,040 USD

Key factors affecting price include material grade (LCC costs 15-25% more than LCB), Stellite hardfacing on sealing surfaces (adds ~15%), extended bonnet design for cold box service (adds 30-50%), and low-temperature impact test certification (adds ~10%) . For domestic market reference, DZ40Y series DN150 models are available at approximately 9,500 CNY ($1,300 USD) with pressure ratings from 1.6MPa to 10.0MPa .

Why Low Temperature Steel for -46 Degree Celsius Service

LCB and LCC are ASTM A352 grades specifically designed for low temperature service. LCB is the standard grade for -46 degree Celsius applications in LNG and ethylene service, while LCC offers higher strength for elevated pressure ratings .

Extended bonnet (long neck) design is a critical feature. The lengthened bonnet ensures the packing box remains at a higher temperature, preventing ice formation and maintaining reliable stem seal performance . The bonnet length is determined by the minimum service temperature and insulating properties of the packing.

Technical Specifications

DN150 low temperature gate valves are available with flanged connections per ANSI, DIN, or GB standards. Material grades include LCB (service down to -46°C), LCC (-46°C to -60°C), and LC3/LN for lower temperatures . Valve stems are 304 or 316 stainless steel to avoid low-temperature embrittlement . Seating surfaces are 13Cr stainless steel or Stellite hardfacing for wear and gall resistance . Design features include flexible wedge, rising stem (OS&Y), bolted bonnet with low-temperature packing, and API 600 design standards .

Selection Considerations

When specifying a DN150 low temperature gate valve, verify material grade matches minimum design temperature. Specify LCB for -46°C standard service; LCC for higher pressure applications. Confirm extended bonnet design meets your installation requirements. Request Charpy V-Notch impact test results for all pressure-containing components. Verify flange standard matches existing piping. For critical applications, request full Material Test Reports per EN 10204 3.1.

Summary

DN150 low temperature steel gate valves are essential for reliable isolation in -46 degree Celsius LNG and ethylene service, with prices ranging from approximately $440 USD for LCB PN16 configurations to over $1,000 USD for LCC Class 300 models. LCB/LCC material selection, extended bonnet design, and certified impact testing are critical for safe low temperature operation. Selection requires careful evaluation of material grade, pressure rating, and connection type based on specific service conditions.

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