Welded Bonnet Globe Valve Description
Welded bonnet globe valve adopts an integrated structure with the bonnet and the valve body permanently welded (not bolted or threaded), and achieves zero leakage sealing of high-pressure and high-risk media by eliminating the sealing point of the bonnet flange gasket. Its typical features include high temperature pressure bearing capacity and compact structure, and it is suitable for harsh working conditions such as petrochemical and power.
Advantages
Zero leakage safety:
The welded structure eliminates the risk of valve cover flange leakage and is suitable for flammable and toxic media (such as liquefied gas and ammonia);
High pressure and high temperature tolerance:
The welded valve cover has a pressure bearing strength 30% higher than the flange valve cover and can withstand 540℃ supercritical steam;
Compact and lightweight structure:
Compared with flange-connected valves, the weight is reduced by 15% to 20%, saving installation space;
Low maintenance cost:
No need to tighten flange bolts regularly, reducing maintenance frequency;
Corrosion resistance and long life:
The chromium-molybdenum steel valve body resists sulfur corrosion (in compliance with NACE MR0175), and the life of the cladding sealing surface exceeds 100,000 times of opening and closing.
Welded Bonnet Globe Valve specification
Design standard: API 602 (forged steel valve specification) + ASME B16.34 (pressure-temperature rating);
Pressure rating: Class 150~2500LB (up to 42MPa);
Connection method: Butt welding (ASME B16.25) or socket welding (ASME B16.11);
Body material: Carbon steel (A105), stainless steel (F304/F316L), chrome-molybdenum steel (WC6/WC9);
Sealing surface: Stellite cobalt-based alloy cladding (hardness ≥HRC 55), high temperature erosion resistance;
Temperature range: -29℃~540℃ (chrome-molybdenum steel can withstand up to 570℃ steam);
Leakage standard: API 598 VI zero leakage (leakage rate ≤0.01ml/min).
Welded Bonnet Globe Valve
Applications
Petrochemical high-risk systems:
Hydrogenation reactor inlet and outlet pipelines (Class 1500LB+ high pressure);
Ethylene unit anti-sulfur corrosion pipelines (requires NACE certification);
Key power energy pipelines:
Thermal power plant Main steam pipeline (540℃/25MPa);
Nuclear power plant auxiliary cooling system (anti-radiation leakage requirements);
Deep cold and special media:
LNG liquefied natural gas storage and transportation (-196℃ deep cold working conditions);
High-purity acid liquid transportation (PTFE lined valve seat optional);
Industrial high-pressure equipment:
Compressor skid-mounted inlet and outlet valves (space-constrained scenarios);
Metallurgical blast furnace gas system (requires wear-resistant lining)
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