Specification

DN50~DN100 1.6MPa~10MPa Superior Temperature-Resistant Bellow Seal Globe Cast Shutoff Valve for Power Generation

I. Product Overview

TIANYU superior temperature-resistant bellow seal globe cast shutoff valve is a core flow control component engineered for power generation infrastructure. Crafted with cast steel (WCB/LCB/WC6) and stainless steel (304/316), it features a bellow seal structure and straight-through design to achieve precise shutoff and flow regulation of water and other high-temperature media. Operating at high temperatures (adaptable to thermal cycling) and 1.6MPa~10MPa pressure, it leverages a metal bellow (resistant to high-temperature fatigue) to replace traditional packing seals, eliminating stem leakage—a critical issue in power plant pipelines. Compliant with DIN, GB, and ANSI standards, it is ideal for boiler feedwater systems, steam pipelines, and cooling circuits in power plants, where high-temperature stability, sealing reliability, and precise flow control are essential.

TECHNICAL PARAMETERS
Product Name	Bellow Globe Valve
Keywords	Globe Valve
Drive Type	Manual/Turbine/Electric/Pneumatic/Hydraulic
Valve Body Material	WCB/LCB/LCC/WC6
Gate Material	304/316/201
Stem Material	420/304/316/310S
Valve Seat Material	Stellite/WCB/PTFE/304/316/507Mo
Size	DN50 – DN100
Working Pressure	1.6MPa/2.5MPa/4.0MPa/6.4MPa/10MPa
OEM & ODM Custom	Accept
Sample	Accept
Logo Custom	Accept

II. Key Attribute Parameters

Size Range: DN50~DN100, covering medium-diameter pipelines for key flow control points in power generation systems.
Pressure Range: 1.6MPa~10MPa, adapting to low to high-pressure systems such as boiler water supply (high pressure) and cooling water circulation (medium pressure).
Temperature Adaptability: High-temperature resistant, with WCB handling up to 425℃, WC6 extending to 593℃—suitable for superheated steam and high-temperature water in power plants.
Material Configuration:
- Body & Bonnet: WCB (general high-temperature use), LCB (low-temperature stability), WC6 (enhanced high-temperature strength for steam).
- Bellow: High-temperature stainless steel (310S/321), resisting oxidation and fatigue under repeated thermal cycling, ensuring long-term sealing.
- Disc & Seat: Stellite (wear-resistant alloy) or 316 stainless steel, with metal-to-metal sealing to withstand high-temperature media erosion.
- Stem: 420/316 stainless steel, connected to the bellow to isolate from high-temperature media, avoiding creep and ensuring smooth operation.
Connection Type: Flange (per DIN/ANSI standards), enabling secure integration with power plant pipelines and easy disassembly for maintenance.
Actuation: Manual (primary), with optional turbine, electric, or pneumatic actuation for remote control in large-scale power systems.
Design & Test Standards: Design follows DIN, GB, ANSI; testing complies with pressure vessel standards, including hydrostatic strength tests at 1.5×rated pressure.

Product Overview

III. Features Description

Bellow Seal for High Temperature: The 310S/321 stainless steel bellow is welded between the stem and bonnet, forming a hermetic barrier that eliminates stem leakage. Unlike packing seals that degrade under high temperature, the bellow retains flexibility through thermal cycles (e.g., steam system startup/shutdown), ensuring zero leakage in long-term use.
Precise Flow Regulation: The globe valve’s linear disc movement (vertical lifting) enables fine-tuned flow adjustment, with a linear flow characteristic that simplifies control of boiler feedwater or cooling water flow—critical for maintaining stable power generation efficiency.
High-Temperature Material Stability: WC6 cast steel and Stellite seat materials retain strength at 593℃, resisting creep and oxidation from superheated steam. This avoids deformation or sealing failure in high-temperature, high-pressure power plant environments.
Dual-Sealing Backup: Bellow (primary) and gland packing (secondary) form a redundant sealing system. If the bellow is damaged, the packing prevents immediate leakage, providing time for maintenance and avoiding unplanned shutdowns in power generation.
Standard Compatibility: Complies with DIN, GB, and ANSI standards, with flange dimensions matching global power plant pipeline specifications. This ensures seamless integration into both domestic and international power infrastructure.

IV. Manufacturing Processes

Material Validation: Cast steel (WCB/WC6) and stainless steel (316/310S) undergo spectral analysis to verify alloy content (e.g., WC6 contains 1.0~1.5% Cr for high-temperature strength). Ultrasonic testing detects internal defects in castings to avoid structural failure under pressure.
Bellow Forming: High-temperature stainless steel sheets are rolled into tubes, then hydraulically formed into corrugated bellows. TIG welding connects the bellow to the stem and bonnet, with helium leak testing (≤1×10⁻⁹ Pa·m³/s) to confirm hermetic sealing—critical for high-temperature media.
Precision Machining: Valve body flow channels and sealing surfaces are CNC-machined to Ra ≤1.6μm, minimizing flow resistance and ensuring uniform contact between disc and seat. The disc is ground to tight tolerances (±0.02mm) for tight shutoff under high pressure.
Assembly & Testing:
- Hydrostatic Test: Body tested at 1.5×rated pressure (e.g., 15MPa for 10MPa) for 30 minutes; seat tested at 1.1×rated pressure with water to verify no leakage.
- High-Temperature Performance Test: Valve is heated to 593℃ (simulating superheated steam) and operated 100+ cycles to confirm bellow flexibility and sealing integrity under thermal stress.
- Operational Test: Manual (or actuator) operation tests verify smooth disc movement, with focus on linear regulation accuracy (±5% flow control error).

Valve Details

V. Product Advantages

Zero Leakage in High-Temperature Systems: Bellow seal eliminates stem leakage, reducing water/steam loss by 99% compared to packing-sealed valves—critical for energy efficiency in power plants, where media loss directly impacts generation efficiency.
High-Temperature Durability: WC6 body and 310S bellow resist oxidation and fatigue at 593℃, extending service life to 8~10 years in thermal cycling environments—twice the lifespan of standard valves in power plant applications.
Precise Flow Control: Linear disc movement enables accurate regulation of boiler feedwater and cooling water flow, maintaining stable pressure and temperature in power generation circuits, which is key to avoiding equipment damage from flow fluctuations.
Easy Maintenance: Flange connection allows in-line disassembly; bellow and seat are modular, enabling component replacement without removing the valve from the pipeline—reducing maintenance downtime in critical power systems.
Standard Compatibility: Compliance with DIN, GB, and ANSI standards ensures integration into domestic and international power plants, avoiding adaptation issues in cross-standard projects.

Application

VI. Application Fields

Boiler Feedwater Systems: Regulates water flow into boilers, with precise control maintaining stable water levels and pressure—critical for boiler safety and efficiency. Bellow seal prevents high-temperature water leakage, avoiding energy waste.
Superheated Steam Pipelines: Controls superheated steam flow in turbine auxiliary systems, with high-temperature materials resisting steam erosion and sealing reliability preventing steam loss (a major energy efficiency concern).
Cooling Water Circuits: Adjusts cooling water flow to condensers and generators, using precise regulation to maintain optimal operating temperatures. Bellow seal avoids leakage that could reduce cooling efficiency.
Desalination Auxiliary Systems: Manages high-pressure water flow in power plant desalination units, with stainless steel components resisting corrosion from treated water and ensuring long-term stability.

TIANYU DN50~DN100 globe valve: cast steel/stainless steel, bellow seal, 1.6~10MPa. High-temperature resistant, zero leakage. Precise flow control, DIN/ANSI compliant. Ideal for power plant boiler, steam, cooling systems. Customizable: material (WC6 for ultra-high temp), actuation (electric) to fit power generation needs.