Customized High-strength Heat-resistant Alloy Steel Main Stop Valve Disc with Precision Hardening & Thermal-fatigue-resistant Design for Steam Turbines
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Product Description
Customized Steam Turbine Main Stop Valve Disc
As the master gate of turbine main-steam systems, the main stop valve performs critical functions during unit start-up, shutdown, emergency trip, and normal operation. The valve disc serves as the core component for rapid shut-off and tight sealing, directly subjected to high-temperature, high-pressure steam impact and alternating thermal-stress loads.
Our company specializes in manufacturing key spare parts for large-scale power plant steam turbines. We design and produce high-performance main stop valve discs for 600 MW and above turbine units. Manufactured in accordance with national standards including DL/T 439 Technical Specification for High-Temperature Fasteners of Fossil-fuel Power Plant and GB/T 150 Pressure Vessels, combined with extensive field overhaul experience, our products guarantee long-term reliability and safety under extreme service conditions.
Technical Features & Advantages
High-strength Heat-resistant Alloy Steel
The disc is integrally forged from premium heat-resisting steel such as 20Cr3MoWVA. It delivers outstanding high-temperature rupture strength, creep resistance, and microstructural stability for long-term service at 540℃-570℃.
Precision Hardening & Optimized Sealing Surface
Main sealing faces and pilot-valve conical surfaces undergo quenching-and-tempering, followed by surface hardening treatments including nitriding or HVOF (High-Velocity Oxy-Fuel) wear-resistant coating. Surface hardness reaches HRC 58-62, significantly improving wear-resistance and anti-galling performance.
Thermal-fatigue-resistant Structural Design
Spherical-seat matching design enables self-alignment while seating, minimizing eccentric load stress. Internal guide slots cooperate with valve-stem pins to prevent disc rotation and avoid sealing-face scratching. Built-in pilot valve balances pressure difference effectively.
Rigorous Manufacturing & Inspection
Each disc undergoes UT (Ultrasonic Testing) and MT (Magnetic Particle Testing) to eliminate internal flaws and surface cracks. Dimensional tolerance complies with ISO 2768-m, with tightly controlled geometric tolerances to achieve perfect fit against valve seat.
Application Scope
- 600 MW, 1000 MW supercritical & ultra-supercritical steam turbine units
- Replacement & retrofitting for HP (High-Pressure) Stop Valve
- Spare-part replacement for planned and emergency overhaul in power plants
- Especially suitable for operating conditions with frequent start-stop and sharp temperature fluctuation, mitigating typical failures such as thermal-stress fatigue and seal leakage
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Chongqing Huanxiang Industrial. Co., Ltd.
Location
Floor 3,No.228,Liang Gang Avenue of Hui Xing Street,Yubei District,Chongqing of China 401120
Contact Person
Tom Hu