DN150 CF8M Wafer Double Eccentric High-Temp Metal Hard Sealed Butterfly Valve

Specification

Connection	Wafer /Lug
Nominal diameter	DN50-DN600
Max. working pressure	Up to 50 Bar (Class 300)
Standard working pressure	20 Bar (Class 150) , 50 Bar (Class 300)
Vacuum	Full vacuum
Face to Face	API 609 Category B, Wafer & Lug
Flange standard	EN1092 PN10/16, ANSI Class150, JIS 10K/16K
Top flange	ISO 5211
Tightness check	ISO 5208 Category 3, API 598 Table 5
Temperature range	-40° C to +400° C (Depending on pressure, medium and material)
Operation	Hand level, gear box, pneumatic actuator, electric actuator

Product Overview

I. Product Overview

TIANYU wafer high-performance butterfly valve is engineered for high-temperature industrial media, featuring a double-eccentric structure and metal hard sealing. Designed with a compact wafer connection, it balances lightweight construction with robust performance, handling gases, oil, and water in demanding environments. Constructed from durable materials (WCB, CF8, CF8M) and compliant with API 609 standards, it supports diverse actuation modes (manual, worm gear, electric, pneumatic) to meet shut-off and regulation needs across industrial, water, and energy sectors.

II. Key Attribute Parameters

Size Range: DN50~DN600 (2″~24″), covering small to large-diameter pipelines to Adapt to process loops, heating systems, and high-temperature transmission lines.
Pressure Rating: Class 150 (20 Bar) and Class 300 (50 Bar), suitable for low to medium-high pressure applications, with full vacuum compatibility.
Temperature Range: -40℃~400℃, with metal hard sealing maintaining stability across thermal cycles, ideal for high-temperature steam and industrial fluids.
Material Configuration:
- Valve Body: Cast carbon steel (WCB), stainless steel (CF8, CF8M) for corrosion resistance, ensuring structural integrity under thermal stress.
- Seal Surface: Metal hard sealing (alloy-coated) for wear resistance, with optional fire-safe designs to meet high-temperature safety requirements.
- Stem: Extended design with anti-blowout structure, made of 316 stainless steel for strength and corrosion resistance.
Connection Type: Wafer or lug type, complying with EN 558 Series 20 and API 609 Table 5 face-to-face dimensions, enabling compact installation between pipeline flanges.
Operation Modes: Manual (hand lever), worm gear (reducing torque), electric, or pneumatic, with ISO 5211 top flange for standardized actuator mounting.
Standards Compliance: Design per API 609; flange standards per EN 1092 PN10/16, ANSI Class 150; testing per ISO 5208 Category 3 and API 598.

III. Structural Features

Double-Eccentric Design: Offset shaft and disc geometry reduce friction between sealing surfaces during operation, lowering torque by 30% compared to concentric valves. This minimizes wear, extending service life in frequent-use systems.
Metal Hard Sealing: Precision-machined metal sealing surfaces (Ra ≤1.6μm) achieve bubble-tight shut-off, resisting oxidation and deformation at 400℃—outperforming soft seals in high-temperature media like superheated steam.
Wafer Connection: Compact design eliminates flanges on the valve body, reducing weight by 40% versus flanged valves and saving installation space, ideal for tight-layout pipelines.
Anti-Blowout Stem: Integral one-piece stem with thrust ring prevents ejection under high pressure, enhancing operational safety in high-temperature and high-pressure systems.
Extended Stem & Insulation: Extended neck design allows for heat insulation, protecting actuators from high temperatures (over 300℃) and enabling flexible actuator mounting in any direction.

Valve Details

IV. Manufacturing Processes

Material Inspection: Raw materials (WCB, CF8) undergo spectral analysis to verify chemical composition (e.g., CF8: 18-20% Cr) and metallographic testing to ensure grain structure stability under high temperatures.
Precision Machining: CNC lathes and grinders shape the double-eccentric disc and valve body, maintaining dimensional tolerances within ±0.05mm to ensure proper sealing. Metal sealing surfaces are lapped to achieve uniform contact.
Seal Enhancement: Sealing surfaces receive alloy coating (e.g., Stellite) via plasma spraying, then are ground to hardness ≥55 HRC, boosting wear and high-temperature resistance.
Assembly & Testing: Each valve undergoes:
- Hydrostatic shell test (1.5×rated pressure) to verify structural integrity.
- Seal test (1.1×rated pressure with air/water) to ensure zero leakage.
- Torque testing with digital meters to confirm smooth operation, with results recorded for traceability.
Surface Treatment: Valve bodies are sandblasted (Sa 2.5) and coated with high-temperature epoxy paint (dry film thickness ≥80μm) for corrosion resistance, suitable for humid or outdoor environments.

V. Product Advantages

High-Temp Stability: Metal hard sealing and heat-resistant materials maintain performance at 400℃, making it suitable for steam systems and high-temperature industrial fluids where soft-sealed valves degrade.
Low Torque Operation: Double-eccentric design reduces friction, enabling easy manual operation even for large-diameter valves (DN600), saving energy in automated systems.
Compact & Cost-Effective: Wafer connection cuts material usage and installation space, lowering costs by 20% compared to flanged valves while maintaining pressure resistance.
Versatile Compatibility: Supports diverse actuation modes and media (gas, oil, water), with material options (CF8M) adapting to mildly corrosive environments like chemical processing.
Long Service Life: Anti-wear design and robust materials ensure reliable performance after 100,000+ cycles, reducing maintenance frequency and downtime.

Application

VI. Application Fields

Industrial Heating: Controls high-temperature water and thermal oil in district heating networks and factory process lines, ensuring efficient energy transfer.
Chemical Processing: Regulates gases and light oils in reaction loops and distillation columns, with metal sealing resisting chemical erosion and high temperatures.
Power Generation: Manages steam flow in boiler auxiliary systems and turbine cooling loops, adapting to thermal cycling between -40℃ and 400℃.
Water & Wastewater: Handles hot water and industrial effluents in treatment plants, with compact design fitting into existing pipeline layouts.
HVAC & Municipal: Controls air and hot water flow in large buildings and infrastructure, balancing performance with installation flexibility.