Customized Labyrinth Steam Seals with High Machining Precision and Stellite Hardfacing for Small Turbines

Labyrinth steam seals are critical static sealing components for small-power industrial steam turbines. Installed between rotors and stators, they form multi-stage labyrinth clearance to restrain steam leakage, reduce energy loss, improve unit thermal efficiency and guarantee stable safe operation.

We provide fully customized steam seal solutions specially tailored for small-power steam turbines including back-pressure turbines, condensing turbines, waste heat turbines, generator drive turbines, and mechanical drive turbines.

• Split arc labyrinth steam seal segments (most widely adopted for small turbines)
• Integral circular steam seal assemblies
• Single-piece labyrinth seal strips
• Optimized high-efficiency seal retrofit components
• Spring-backed steam seal segments

42CrMo, 25Cr2MoV, 12Cr1MoV, stainless steel, cast alloy steel and other heat-resistant materials, matched according to operating temperature, pressure and medium conditions.

• Drawing verification & technical scheme confirmation
• Forging / casting blank preparation
• Normalizing & tempering heat treatment
• Rough CNC machining
• Stress relief annealing
• Precision finish machining of labyrinth teeth, mounting surfaces and bolt holes
• Optional: Stellite alloy hardfacing on sealing tooth tips
• Dimensional inspection, concentricity & flatness testing
• NDT inspection (PT/MT/UT as required)
• Deburring, cleaning and anti-rust packaging

• Small condensing / back-pressure power generation steam turbines
• Waste heat recovery small turbines
• Mechanical drive turbines (pump, fan, compressor drive)
• Cogeneration industrial turbines used in chemical, textile, paper, metallurgy industries