Welded Safety Valve DN50 Price and High Pressure Steam Pipeline Applications
This article provides comprehensive pricing information and technical selection guidance for DN50 welded safety valves used in high pressure steam service.The main safety valve product names of China gate valve Network include:Hydraulic Safety Valve,Impulse Safety Valve,Impulse Spring Safety Valve,JIS Safety Valve,Main Safety Valve,Overflow Valve,Oil Refining Specific Safety Valve,Pulse Safety Valve,Pilot Safety Valve,Pressure Safety Valve,Quick Switching Safety Valve,Spring Low Lift Safety Valve,Spring Low Lift High Pressure Safety Valve,Spring Low Lift Closed High Pressure Safety Valve,Spring Fall Lift Closed High Pressure Safety Valve
Price Reference for Welded Safety Valve DN50
The price of a DN50 welded safety valve varies significantly based on material, pressure rating, and brand positioning. Below are current market reference points:
Economy segment stainless steel welded safety valves are available from approximately 180 CNY per unit for basic models with A61H series designation, suitable for steam service at temperatures up to 200 degrees Celsius . Bulk pricing can reduce costs to around 170 CNY per unit for orders of 20 pieces or more.
Premium domestic welded safety valves with higher pressure ratings typically range from 888 to 999 CNY per unit for models such as A24Y-320P and A61Y series, which support operating pressures up to 50MPa and temperatures from -198 to 680 degrees Celsius .
For high-end international brands such as Emerson Sempell SOH series, prices are significantly higher and vary based on configuration, with capabilities including set pressures from 10 to 320 bar and temperatures up to 700 degrees Celsius .
Key factors affecting price include valve body material, pressure class, sealing design, and whether the valve features full-lift or micro-lift construction. Welded end connections typically command a premium over threaded connections due to the additional machining and material requirements .
Technical Specifications for High Pressure Steam Service
When selecting a welded safety valve for high pressure steam pipelines, the following technical parameters must be verified:
Pressure and Temperature Ratings
For high pressure steam applications, safety valves must be rated for the maximum operating pressure and temperature of the system. Common pressure ratings for DN50 welded safety valves range from PN16 (1.6MPa) to PN400 (40MPa) . Temperature capabilities vary by material selection, with carbon steel bodies suitable up to approximately 425 degrees Celsius, alloy steel grades supporting up to 500 degrees Celsius, and advanced materials capable of 700 degrees Celsius .
Valve Type Selection
The selection between full-lift and micro-lift safety valves depends on the medium and required discharge capacity. For steam and other compressible fluids, full-lift safety valves are generally recommended as they provide rapid full opening and maximum discharge capacity . Micro-lift valves may be suitable for liquid applications or where lower discharge rates are acceptable .
Material Selection
Valve body materials for high pressure steam applications include carbon steel grades such as WCB, alloy steels including WC6 and WC9 for elevated temperatures, and stainless steel for corrosive steam conditions . Sealing surfaces are typically hard-faced with Stellite cobalt-based alloy to withstand high temperature steam erosion and provide reliable shutoff after each opening cycle .
Welded End Connection
Welded connections provide a permanent, leak-free joint suitable for high pressure and high temperature steam systems where flanged connections may present leakage risks. When ordering welded safety valves, the pipe outer diameter, wall thickness, and joint type must be specified .
Application in High Pressure Steam Pipelines
Welded safety valves serve as the primary overpressure protection device in steam systems including:
Boiler drum protection, where safety valves must reliably open at set pressure to vent excess steam and prevent catastrophic failure . Superheater and reheater protection, requiring valves capable of withstanding the highest temperatures in the steam cycle . High pressure steam distribution headers where welded connections eliminate potential leak paths .
Selection Considerations
When specifying a welded safety valve for high pressure steam service, consider the following factors:
Set pressure must be matched to the maximum allowable working pressure of the protected system. The valve should be set at or below this pressure to ensure timely opening . Required discharge capacity must be calculated based on the maximum steam generation rate to ensure the valve can safely relieve all excess pressure . Back pressure effects should be evaluated, particularly for systems with common discharge headers, with balanced bellows designs available for high back pressure applications .
Summary
DN50 welded safety valves for high pressure steam pipelines represent a critical safety investment with prices ranging from approximately 180 CNY for basic carbon steel models to over 999 CNY for premium stainless steel and high pressure rated versions. Selection requires careful evaluation of pressure rating, temperature capability, material compatibility, and discharge capacity requirements. For critical steam system applications, consulting with qualified valve suppliers who can provide certified performance data is strongly recommended to ensure proper system protection.
Do you still need to know or purchase the following gate valve products:
