Micro-Lift Safety Valve DN40 Price for Liquid Media Applications
Unlike full-lift valves used for gases and steam, the micro-lift design features a proportional opening characteristic where the valve disc lifts gradually in relation to pressure increase, with maximum opening height limited to 1/20 to 1/40 of the flow diameter . This provides controlled, stable pressure relief ideal for liquid systems. This article provides essential pricing information and key selection parameters for DN40 micro-lift safety valves for liquid service.The main safety valve product names of China safety valve Network include:Anti-sulfur Spring Type Safety Valve,Explosion Wave Proof Safety Valve,F2-250/400 Main Safety Valve,Pulse Safety Valve,Pilot Safety Valve,Pressure Safety Valve,Spring Fall Lift Closed High Pressure Safety Valve,Safety Check Valve,Thermal Power Station Used Non-standard Safety Valve.
Price Reference for DN40 Micro-Lift Safety Valve
Prices for DN40 micro-lift safety valves vary significantly based on brand, material grade, and pressure rating:
Domestic brand models such as Yongyi A41H-16C-DN40 are available from approximately 945 CNY per unit for carbon steel configurations with flange connections .
Premium domestic models such as Cross A41Y-40-DN40 with higher pressure ratings are priced from approximately 1,489 CNY for carbon steel construction suitable for corrosive media up to 200°C .
Cross A47H-40-DN40 models for steam and air service are available from approximately 2,087 CNY for PN64 configurations with carbon steel WCB body .
High-end imported models such as Spirax Sarco SV615 DN40 for liquid service range from approximately 4,981 to 14,400 CNY depending on configuration and optional features .
Premium sanitary stainless steel models for clean systems such as Spirax Sarco SVL488 DN40 are priced from approximately 71,146 CNY, reflecting specialized hygienic design and TÜV certification .
Key factors affecting price include brand positioning (domestic vs imported), material grade (carbon steel vs stainless steel), pressure rating (PN16 to PN64), and certification requirements.
Understanding Micro-Lift Design for Liquid Service
Micro-lift safety valves are specifically designed for incompressible fluids . The defining characteristic is the proportional opening behavior: as inlet pressure increases beyond the set pressure, the disc lifts gradually, with maximum lift height between 1/20 and 1/40 of the flow diameter . This controlled opening provides stable pressure relief without the sudden full opening characteristic of full-lift valves.
For liquid media, micro-lift design is preferred because liquids require controlled pressure release to prevent system shock and maintain stable operation . The proportional opening feature minimizes pressure surge and provides smooth system pressure regulation. Full-lift valves with rapid full opening are typically used for gases and steam, while micro-lift valves are the standard choice for liquids .
Technical Specifications
Pressure and Temperature: DN40 micro-lift safety valves are available in pressure ratings from PN16 to PN64 (1.6MPa to 6.4MPa) with temperature capabilities from 200°C for corrosive media to 350°C for steam service .
Material Options: Body materials include carbon steel WCB for standard service and stainless steel for corrosive liquid applications. Sealing surfaces are hardfaced with Stellite or similar alloys for wear resistance and reliable sealing .
Design Features: Micro-lift design provides controlled proportional opening with maximum discharge capacity limited to safe levels for liquid service. Closed bonnet design prevents media leakage for hazardous liquids. Spring loaded operation ensures reliable set pressure accuracy with automatic reset after pressure normalization.
Connections: Available with flanged RF connections per ANSI, DIN, or GB standards, as well as threaded connections for smaller installations.
Standards: API 520 for design, API 527 for seat tightness, and ASME Section VIII for pressure vessel applications.
Liquid Media Applications
DN40 micro-lift safety valves serve critical functions in liquid pipeline systems, water and wastewater treatment facilities, chemical processing, hydraulic systems, and pump discharge protection where controlled overpressure relief is essential for system safety.
Summary
DN40 micro-lift safety valves are essential for reliable overpressure protection in liquid media service, with prices ranging from approximately 945 CNY for domestic models to over 70,000 CNY for premium sanitary configurations. Micro-lift design provides the proportional opening characteristic necessary for stable liquid pressure relief. Selection requires careful evaluation of set pressure, material compatibility, and connection type based on specific liquid media and system requirements.
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