Bellows Safety Valve DN50 Price – Balanced Back Pressure Type
The integral stainless steel bellows provides a dual function: it isolates the spring and bonnet from the process media, preventing corrosion, and it balances the effect of variable back pressure on the set pressure . This ensures accurate and reliable relief performance even when discharge headers are subject to pressure variations. This article provides essential pricing information and key selection parameters for DN50 bellows balanced safety valves.The main safety valve product names of China safety valve Network include:Spring Low Lift Safety Valve,Spring Low Lift High Pressure Safety Valve,AD Safety Valve Muffler,Bellows Spring Fall Lift SafetyValve,Built-in Safety Valve,Butterfly Spring Type Safety Valve,Copper Safety Valve,Duplex Safety Valve,900 DIN Safety Valve,Air Compressor Safety Valve.
Price Reference for DN50 Bellows Balanced Safety Valve
Prices for DN50 bellows safety valves vary significantly based on material grade, pressure rating, and brand:
Economy carbon steel models (WA42Y-40C) with WCB body and 0.1MPa set pressure are available from approximately 8,219 CNY ($1,130 USD) .
Premium carbon steel configurations with higher set pressure ratings (WA42Y-25C, 1.3MPa) historically range from approximately 4,228 CNY ($580 USD) .
Stainless steel models (WA42Y-25R) command premium pricing, available from approximately 12,690 CNY ($1,740 USD) for 2.26MPa set pressure configurations .
For comparison, imported ARI-FABA®-Plus metal bellows valves DN50 PN40 are priced at approximately 1,546 USD (excluding VAT) .
Key factors affecting price include body material (carbon steel WCB vs stainless steel CF8/CF8M), pressure rating (PN16 to PN100), set pressure range, and brand positioning.
Understanding Bellows Balanced Design
Bellows balanced safety valves are specifically engineered for applications with variable back pressure . The stainless steel formed bellows serves two critical functions: it creates a zero-leakage barrier to prevent media escape to atmosphere, and it isolates the spring from back pressure effects, ensuring set pressure accuracy within ±3% .
This design provides excellent protection for toxic and corrosive media service, eliminates the need for closed bonnet vent piping, and provides consistent performance under fluctuating back pressure conditions. The bellows also protects the spring and guiding components from corrosion, significantly extending service life .
Technical Specifications
Pressure and Temperature: Available in pressure ratings from PN10 to PN100, with temperature capability up to 300°C for carbon steel models . Forged nozzle construction ensures safe operation at maximum pressure conditions.
Material Options: Valve body available in WCB carbon steel (standard) or CF8/CF8M stainless steel for corrosive service . Bellows materials include stainless steel 316 with options for Hastelloy C276 and Inconel 625 for aggressive media . Sealing surfaces are hardfaced with Stellite alloy for wear resistance .
Design Features: Full lift design provides maximum discharge capacity for gas and vapor applications. Adjustable set pressure range from 0.06MPa to 9.0MPa . Flanged connections per ANSI, DIN, or GB standards. Closed bonnet design prevents media leakage.
Standards: API 526 design, API 527 seat tightness, and NACE MR0175 compliance available for sour service applications.
Applications
DN50 bellows balanced safety valves serve critical functions in systems with toxic or flammable gas media, variable back pressure discharge headers, corrosive media pipelines, and steam systems requiring zero-leakage protection . Recommended for use in chemical plants, refineries, oil and gas production, and power generation facilities .
Selection Considerations
When specifying a DN50 bellows safety valve, verify set pressure matches system MAWP and confirm back pressure conditions require bellows balancing. Select materials compatible with process media, and specify NACE compliance for sour service if required. Confirm bellows material compatibility with process media, ensuring 316 stainless steel provides adequate corrosion resistance; consider Hastelloy C276 or Inconel 625 for aggressive service .
Summary
DN50 bellows balanced safety valves provide reliable overpressure protection for variable back pressure systems, with prices ranging from approximately 4,228 CNY for carbon steel models to over 12,690 CNY for stainless steel configurations. The bellows design eliminates media leakage and isolates the spring from back pressure effects, ensuring accurate and reliable relief performance. Selection requires careful evaluation of set pressure, material compatibility, and back pressure conditions based on specific application requirements. Consulting with qualified manufacturers who provide certified performance documentation is strongly recommended for critical service applications.
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