With its rapid full opening characteristic and maximum discharge capacity, this valve ensures reliable system protection where quick pressure relief is essential. This article provides essential pricing information and key selection parameters for DN80 full lift spring safety valves for gas service.The main safety valve product names of China safety valve Network include:A69Y Main Safety Valve(W Series) Welding Safety Valve,Anti-sulfur Spring Type Safety Valve,Overflow Valve,Oil Refining Specific Safety Valve,Pulse Safety Valve,Pilot Safety Valve,Pressure Safety Valve,Spring Low Lift Safety Valve,Spring Low Lift High Pressure Safety Valve.

Price Reference for DN80 Full Lift Safety Valve

Prices for DN80 full lift spring safety valves vary based on brand, pressure rating, and connection type:

Premium brand models from established manufacturers such as Keluos are available from approximately 2,729 to 3,309 CNY for DN80 configurations, depending on connection type and specification .

Standard domestic brand models such as Yongyi are priced at approximately 1,473 CNY for DN80 PN25 configurations with flange connections .

Factory direct pricing for full lift safety valves from Chinese manufacturers is available from approximately $70 to $100 USD for bulk orders of 20 pieces or more, offering significant cost advantages for large projects .

Key factors affecting price include brand positioning (premium imported vs domestic), pressure rating (PN16 to PN64), connection type (flanged vs threaded), and certification requirements.

Understanding Full Lift Design for Gas Service

Full lift safety valves are specifically designed for gas and vapor applications . The defining characteristic is that the valve disc lifts to a height equal to or greater than 1/4 of the seat flow diameter, providing maximum discharge capacity . When the system pressure reaches the set pressure, the valve opens rapidly and fully, releasing excess pressure with minimal overpressure .

For gas media, full lift design is essential because gases require rapid and complete pressure relief to prevent dangerous pressure build-up. Micro-lift valves are typically used for liquid service, while full lift valves are the standard choice for gases, steam, and vapors .

Technical Specifications

Pressure and Temperature: DN80 full lift safety valves are available in pressure ratings from PN16 to PN64 (1.6MPa to 6.4MPa) with temperature capabilities up to 300°C for carbon steel WCB models and up to 200°C for stainless steel models .

Material Options: Body materials include ASTM A216 WCB carbon steel for standard service and CF8/CF8M stainless steel for corrosive gas applications . Sealing surfaces are hardfaced with Stellite cobalt-chromium alloy for wear resistance and reliable sealing.

Design Features: Full lift design provides maximum discharge capacity with overpressure typically limited to 10% above set pressure . Closed bonnet design prevents media leakage to atmosphere for hazardous gases . Adjustable set pressure accommodates system requirements.

Connections: Available with flanged RF connections per ANSI, DIN, or GB standards, as well as threaded connections for smaller installations .

Standards: API 526 for design, API 527 for seat tightness, and ASME Section VIII for pressure vessel applications.

Gas Medium Applications

DN80 full lift safety valves serve critical functions in gas compressor systems, natural gas pipelines, steam boilers, air receiver tanks, and gas processing facilities where rapid overpressure protection is essential for system safety .

Summary

DN80 full lift spring safety valves are essential for reliable overpressure protection in gas media service, with prices ranging from approximately $70 USD for bulk orders to over 3,300 CNY for premium brand configurations. Full lift design provides the rapid response and maximum discharge capacity necessary for gas applications. Selection requires careful evaluation of set pressure, material compatibility, and connection type based on specific gas media and system requirements.

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