Specification

TIANYU DN250 PN40 WCB Multi-Layer Metal Hard Sealing Hydraulic Butt-Welded Butterfly Valve

I. Product Overview

TIANYU DN250 PN40 hydraulic butterfly valve represents a pinnacle of industrial flow control engineering. Built on a foundation of WCB cast carbon steel, it integrates multi-layer metal hard sealing and hydraulic actuation to deliver uncompromising performance in high-pressure, medium-diameter pipeline systems. Engineered for reliability, it excels in applications demanding leak-tight media containment, precise flow modulation, and resilience against harsh operating conditions. Across petrochemical, power generation, and heavy industrial sectors, this valve ensures process integrity, safety, and efficiency, standing as a cornerstone of critical pipeline infrastructure.

II. Key Attribute Parameters

Size & Pressure Ratings

Dimension: DN250 caters to medium-diameter pipelines, balancing substantial flow capacity (ideal for systems like cooling water loops or process fluid transfer) with manageable space requirements. Its 250mm bore supports volumetric flow rates suitable for industrial-scale operations while fitting within standard pipeline layouts.
Pressure Capacity: PN40 (4.0MPa) enables operation in high-pressure environments—critical for applications like boiler feedwater systems, high-pressure oil/gas transfer, or industrial fluid processing. This rating ensures the valve withstands pressure fluctuations and maintains sealing integrity under sustained load.

Material Composition

Body & Disc: Crafted from ASTM A216 WCB cast carbon steel, renowned for its high strength, impact resistance, and cost-effective durability. WCB’s ability to withstand moderate temperatures (up to ~425°C in typical applications) and general industrial wear makes it a reliable choice for valve components, ensuring structural integrity over long service lifecycles.
Sealing Surfaces: Multi-layer metal hard seals utilize alloy steels (e.g., stainless steel, chrome-molybdenum alloys) selected for wear/corrosion resistance. These materials maintain tight contact under pressure, resisting deformation and ensuring leak-tight performance even with temperature variations or abrasive media.
Stem: Constructed from alloy steel (e.g., 2Cr13), the stem transmits hydraulic actuation force to the disc. Corrosion-resistant and torque-resistant, it prevents seizing or bending during operation, ensuring smooth, reliable disc movement.

Connection & Actuation

Joining Method: Butt-welded connections fuse the valve to pipelines, eliminating flange/gasket leakage points. This joint strength matches pipeline integrity, withstanding thermal expansion, vibration, and pressure surges—vital for high-pressure systems (e.g., power plant steam lines) or underground installations.
Actuation System: Hydraulic actuation delivers high torque for effortless disc positioning. It enables rapid response times (critical for emergency shutdowns) and precise flow modulation, integrating seamlessly with PLC/DCS control systems for automated industrial processes.

Operational Boundaries

Temperature Range: -20°C to 425°C (dependent on media and material upgrades). Within this span, WCB and metal seals maintain performance, making the valve suitable for applications like hot oil transfer, steam systems, or ambient-temperature water networks.

Product Overview

III. Features Description

Multi-Layer Metal Hard Sealing

The valve’s core strength lies in its multi-layer metal seal design. Unlike soft seals prone to degradation, metal surfaces (e.g., alloy steel/ stainless steel) create redundant barriers against leakage. Precision-machined sealing faces—often lapped/honed to tight tolerances—ensure uniform contact, even under pressure fluctuations. This design resists wear from abrasive media (e.g., slurries, particulate-laden fluids) and maintains sealing integrity across temperature cycles, reducing fugitive emissions and ensuring process safety.

Hydraulic Actuation Advantages

High Torque Delivery: Hydraulic systems generate substantial torque, overcoming resistance from high-pressure seals and disc inertia. This allows smooth, consistent disc movement—critical for maintaining flow control in PN40 applications (e.g., rapidly closing a valve in a high-pressure water line to prevent system overpressure).
Precision Control: Hydraulic actuation enables fine-tuned disc positioning, supporting linear flow modulation (e.g., throttling steam flow in power plants to regulate turbine speed). Integrating with automation systems, it allows remote operation in hazardous/unmanned environments, enhancing process efficiency and safety.

WCB Material Benefits

Structural Robustness: WCB’s cast structure ensures uniform mechanical properties, resisting pressure-induced deformation or cracking. This durability reduces maintenance costs in high-pressure systems, where component failure could disrupt operations (e.g., petrochemical refining).
Cost-Effective Reliability: Balancing performance and expense, WCB avoids the premium of exotic alloys while delivering industrial-grade durability. For general-purpose applications (e.g., municipal water treatment), it provides a cost-efficient solution without compromising safety.

Butt-Welded Connection Merits

Leak-Tight Integrity: By fusing valve and pipeline, butt-welds eliminate gasket compression issues or flange misalignment risks. This is critical for hazardous media (e.g., hydrocarbons, toxic chemicals), where even minor leaks pose safety/environmental threats.
Systemic Strength: The welded joint becomes part of the pipeline’s structural backbone, enhancing overall system resilience to external forces (e.g., seismic activity, mechanical vibration in industrial plants).

IV. Manufacturing Processes

Casting WCB Components

Pattern Creation: Precision molds (metal/wood) shape the valve body/disc, ensuring dimensional accuracy.
Molding & Pouring: Molten WCB (1400–1500°C) fills sand molds, solidifying into rough castings.
Heat Treatment: Annealing/normalizing relieves internal stresses, improving machinability and mechanical properties (e.g., reducing brittleness).

Machining & Finishing

Rough Machining: Turning, milling, and drilling remove excess material, establishing basic dimensions.
Precision Finishing: CNC operations achieve tight tolerances (e.g., sealing surfaces to Ra ≤1.6μm), ensuring proper seal contact. Lapping/honing refines sealing faces for leak-tight performance.

Sealing Assembly

Material Selection: Alloys are chosen based on media (e.g., stainless steel for corrosive fluids, chrome alloys for high temperatures).
Component Fabrication: Metal seals are cut/shaped to precise dimensions, then surface-treated (e.g., plating, coating) for enhanced wear resistance.
Integration: Seals are press-fit/bolted into the valve, aligned to ensure multi-layer contact and uniform pressure distribution.

Hydraulic Actuator Integration

Actuator Construction: Cylinders, pistons, and control valves are manufactured/tested for pressure integrity (1.5×PN40).
Valve-Actuator Alignment: The actuator is mounted to the stem, calibrated to ensure smooth disc movement (0–90° rotation) and torque matching.

Welding & Inspection

Butt-Weld Execution: Welding follows ASME B31.3 standards, with 100% NDT (X-ray/ultrasonic testing) to detect defects. Post-weld heat treatment relieves stresses.
Quality Validation: Hydrostatic testing (1.5×PN40) verifies body integrity; seat testing (PN40) confirms sealing. Cycle testing (10,000+ operations) ensures actuation reliability.

Valve Details

V. Product Advantages

Uncompromising Sealing Reliability

Multi-layer metal hard seals eliminate leakage risks—critical for hazardous media or costly processes. Unlike soft seals, they resist wear, temperature extremes, and abrasive media, ensuring long-term performance in applications like chemical processing or high-pressure gas transfer.

High-Pressure Endurance

PN40 rating and WCB construction enable operation in systems like boiler feedwater loops or oil/gas pipelines. The valve withstands pressure surges, maintaining structural integrity and sealing performance, reducing downtime and safety hazards.

Precision Flow Control

Hydraulic actuation delivers precise disc positioning, supporting linear flow modulation. This is vital for processes like steam turbine bypass control (power generation) or chemical reactor feed regulation, where flow accuracy directly impacts product quality and efficiency.

Long-Term Durability

WCB’s strength, metal seals’ resilience, and welded joints’ integrity ensure 20–30-year service life. Reduced maintenance/replacement costs make it economical for capital-intensive projects (e.g., refinery infrastructure).

Enhanced Safety & Compliance

Leak-tight design and hydraulic actuation enable rapid emergency shutdowns, protecting personnel and equipment. Compliance with ASME/ISO standards ensures global applicability in regulated industries (e.g., petrochemical, nuclear).

Application

VI. Product Applications

Petrochemical Industry

Refineries: Controls high-pressure flows of crude oil, fuels, and chemicals. Multi-layer seals prevent leaks in aggressive media; hydraulic actuation supports automated process control (e.g., catalytic cracking unit feed regulation).
Chemical Plants: Manages corrosive fluids (e.g., acids, solvents). Material upgrades (stainless steel seals) enhance compatibility, ensuring safe, efficient operation in reactors, distillation columns, and transfer lines.

Power Generation

Steam Systems: Regulates high-pressure steam flow in boilers, turbines, and condensate loops. Butt-welded joints withstand thermal cycling; metal seals resist steam erosion, ensuring reliable operation in power plant critical paths.
Nuclear Facilities: In non-safety-related systems, controls cooling water/process fluid flow. Its robust design and leak-tightness align with nuclear industry reliability standards.

Water & Wastewater Treatment

High-Pressure Water Networks: Manages pressurized water transfer in industrial plants or municipal systems. WCB’s durability and metal seals’ resistance to waterborne contaminants ensure long-term performance in filtration, desalination, or wastewater reuse systems.

Heavy Industry

Steel Mills: Controls cooling water, steam, and process fluid flows. Hydraulic actuation enables rapid response to process changes (e.g., blast furnace cooling); butt-welded joints withstand vibration and thermal shocks.
Mining Operations: Manages slurry or high-pressure water jets for ore extraction. Metal seals resist abrasion, ensuring reliable operation in harsh, particulate-laden environments.

VII. Customization

Concise Recap

TIANYU DN250 PN40 butterfly valve merges WCB strength, multi-layer metal sealing, and hydraulic precision to deliver leak-tight, high-pressure flow control. Ideal for petrochemical, power, and heavy industrial applications, it ensures safety, efficiency, and durability—critical for infrastructure reliability.

Customization Potential

Material Upgrades: For corrosive media, seals/body can be upgraded to stainless steel (316L) or duplex alloys. For high temperatures, chrome-molybdenum steels enhance thermal resistance.
Actuation Tuning: Hydraulic systems can be customized for faster response times, higher torque, or integration with smart sensors (HART/Profibus) for predictive maintenance.
Temperature Adaptation: Low-temperature (cryogenic) or high-temperature (up to 600°C) modifications use materials like Inconel or ceramic coatings, expanding application scope to LNG plants or thermal fluid systems.

By tailoring materials, actuation, and design, the valve adapts to unique industrial challenges—ensuring optimal performance in any critical pipeline environment.

DN250 PN40 WCB Multi-Layer Metal Hard Sealing Hydraulic Triple Offset Butt-Welded Butterfly Valve