Specification

Wafer Lug Type Triple Eccentric Butterfly Valve with Stainless Steel/Carbon Steel Body for Industrial Water, Steam, Oil, and Seawater Applications

I. Product Overview

TIANYU wafer lug type triple eccentric butterfly valve is a high-performance industrial valve engineered with advanced triple eccentric technology, designed to deliver reliable flow control in demanding industrial environments. Constructed with either full stainless steel or carbon steel bodies, this valve combines robust structural design, precise sealing performance, and versatile applicability to meet the stringent requirements of systems handling water, steam, oil, seawater, and other industrial media. Its wafer lug connection and worm gear operation ensure easy installation and efficient operation, making it a critical component in industries where tight shutoff, durability, and adaptability to varying temperatures and pressures are essential. Whether integrated into pipeline systems for water treatment, petrochemical processing, or power generation, this valve maintains consistent performance across a broad range of operational conditions.

II. Key Attributes and Specification Parameters

1. Basic Attributes

Structure Design: Features a triple eccentric sealing structure, where the valve stem, disc, and sealing surface are offset by three distinct eccentricities. This design minimizes friction between the disc and sealing surface during operation, reducing wear and enhancing sealing reliability—especially critical for high-temperature and high-pressure applications.
Body Material: Available in two primary material options: full stainless steel (for enhanced corrosion resistance, ideal for seawater or chemical-rich environments) and carbon steel (for cost-effective performance in general industrial settings with moderate corrosion conditions).
Connection Form: Wafer lug type, allowing for easy installation between pipeline flanges without the need for additional gaskets in some configurations. The lug design provides added stability, enabling the valve to be used as a blind flange when fully closed, enhancing system flexibility.
Driving Mode: Worm gear operation, which converts rotational motion into linear actuation of the disc. This mechanism offers precise control over flow rates, with a self-locking feature that prevents unintended movement, ensuring safe operation in critical systems.
Pressure Rating: Available in two nominal pressure classes to accommodate diverse industrial needs: 150lb and 300lb, corresponding to medium-pressure applications (2.5MPa < PN < 6.4MPa) as defined by industry standards.
Temperature Range: Designed to operate across a broad temperature spectrum from -29°C to 425°C, making it suitable for both low-temperature and high-temperature media such as steam.
Media Compatibility: Versatile for use with multiple industrial media, including water (fresh and industrial), steam, mineral oil, hydraulic oil, and seawater, ensuring adaptability across different operational contexts.
Design and Testing Standards: Complies with international standards to ensure quality and compatibility:
- Design Standard: API 609 (specifications for butterfly valves)
- Flange Connection Dimensions: ANSI B16.5 (ensuring compatibility with ANSI-standard flanges)
- Structure Length: ANSI B16.10 (defining valve length for consistent installation)
- Pressure Testing: API 598 (establishing procedures for shell and seal testing to verify leak tightness)

2. Detailed Specification Parameters

Nominal Diameter Range: 2″ to 36″ (corresponding to DN50 to DN900), covering small to large pipeline systems.
Test Pressures:
- For 150lb class: Shell test pressure 3.0MPa; Seal test pressure 2.2MPa
- For 300lb class: Shell test pressure 7.5MPa; Seal test pressure 5.5MPa

Key Dimensions (Selected Sizes for Reference):

150lb Class:

Size (in)	L (mm)	H (mm)	Ho (mm)	D1 (mm)	D2 (mm)	M	Z-d	Weight (kg)
6″	70	175	545	241.5	216	M20	8-22	28
8″	71	210	615	298.5	270	M20	8-22	36
10″	76	250	695	362	324	M24	12-25	53
20″	127	415	1110	635	584	M30	20-32	196

300lb Class:

Size (in)	L (mm)	H (mm)	Ho (mm)	D1 (mm)	D2 (mm)	M	Z-d	Weight (kg)
6″	76	175	545	270	216	M20	12-22	29
8″	89	210	615	330	270	M24	12-26	38
10″	114	250	695	387	324	M27	16-29	58
20″	152	415	1110	686	584	M33	24-35	215

Product Overview

III. Product Features

TIANYU wafer lug type triple eccentric butterfly valve is distinguished by a range of features that enhance its performance, reliability, and adaptability in industrial applications:

Triple Eccentric Sealing Excellence: The triple eccentric design—incorporating offsets in the valve stem, disc, and sealing surface—eliminates contact between the disc and seat during opening and closing, reducing friction and wear. This results in a tight, metal-to-metal hard seal that achieves bubble-tight shutoff, even after repeated cycles, making it suitable for applications where leakage could compromise system efficiency or safety.
Wafer Lug Connection Advantage: The wafer design allows for compact installation between pipeline flanges, reducing space requirements compared to flanged valves. The integrated lugs provide additional structural support, enabling the valve to withstand pipeline loads independently and function as a temporary blind flange when closed, simplifying system maintenance and isolation.
Worm Gear Operation Precision: The worm gear drive offers smooth, controlled actuation with reduced operating torque, allowing for precise flow regulation. Its self-locking capability prevents backdrive from line pressure, ensuring the valve remains in the desired position, critical for maintaining consistent flow rates in automated or manual systems.
Broad Temperature and Pressure Adaptability: With a temperature range of -29°C to 425°C and pressure ratings of 150lb and 300lb, the valve performs reliably in both extreme cold (e.g., seawater in cold climates) and high-heat (e.g., industrial steam) environments, eliminating the need for multiple valve types in mixed-condition systems.
Dual Material Options: Stainless steel bodies provide superior corrosion resistance, making them ideal for seawater, chemical-laden media, or outdoor installations where rust is a concern. Carbon steel bodies offer cost-effective durability for general industrial applications with milder media, ensuring optimal performance at a lower price point.
Compliance with International Standards: Adherence to API 609, ANSI B16.5, and API 598 ensures compatibility with global industrial systems, facilitating integration into existing pipelines and reducing installation complexity for multinational projects.

IV. Manufacturing Process

TIANYU adheres to strict manufacturing protocols to ensure the quality and performance of its triple eccentric butterfly valves:

Material Selection and Inspection: Raw materials (stainless steel and carbon steel) are selected based on their mechanical properties, corrosion resistance, and temperature tolerance. Stainless steel grades are chosen for their ability to withstand seawater and chemical exposure, while carbon steel is selected for its strength in general applications. All materials undergo rigorous inspection, including chemical composition analysis and mechanical testing, to verify compliance with standards.
Precision Machining of Eccentric Components: The triple eccentric structure requires high-precision machining to ensure accurate offsets between the stem, disc, and seat. Advanced CNC machining centers are used to fabricate the valve body, disc, and stem, maintaining tight tolerances (within ±0.01mm) to ensure proper alignment and sealing. The sealing surface of the disc and seat undergoes specialized grinding to achieve a smooth finish, critical for metal-to-metal sealing.
Worm Gear Assembly and Calibration: The worm gear mechanism is assembled with precision, ensuring meshing gears operate with minimal backlash. This assembly is calibrated to ensure consistent torque requirements across the valve’s operating range, with tests conducted to verify the self-locking feature under varying pressures.
Sealing Surface Treatment: For metal hard sealing, the disc and seat surfaces are treated with processes such as carburizing or nitriding to enhance hardness (up to HRC 55-60), improving wear resistance and extending service life. This treatment ensures the sealing surface remains effective even after thousands of cycles.
Pressure Testing and Quality Control: Each valve undergoes comprehensive testing in accordance with API 598. Shell tests verify the valve body’s integrity under 1.5 times the nominal pressure, while seal tests (conducted at 1.1 times the nominal pressure) ensure zero leakage. Additional tests include operation testing to verify smooth actuation and dimensional checks to confirm compliance with ANSI B16.10 and B16.5 standards.

Valve Details

V. Product Advantages

TIANYU wafer lug type triple eccentric butterfly valve offers numerous advantages that make it a preferred choice for industrial flow control:

Superior Sealing Reliability: The triple eccentric design ensures bubble-tight shutoff, even in high-pressure and high-temperature applications, reducing the risk of media loss and enhancing system efficiency. This is particularly valuable in steam systems or oil pipelines where leakage can lead to safety hazards or operational losses.
Extended Service Life: Reduced friction from the eccentric design, combined with hardened sealing surfaces, minimizes wear, extending the valve’s service life to tens of thousands of cycles—significantly longer than conventional butterfly valves.
Space and Cost Efficiency: The wafer lug design reduces installation space compared to flanged valves, making it ideal for compact systems. Additionally, the dual material options allow users to select the most cost-effective solution for their specific media, without compromising performance.
Easy Installation and Maintenance: The wafer connection simplifies installation, requiring only bolts to secure the valve between flanges. The lug design allows for easy removal and replacement without disassembling the entire pipeline, reducing downtime during maintenance.
Versatile Application Range: With compatibility across a broad range of media (water, steam, oil, seawater) and operating conditions (-29°C to 425°C), the valve eliminates the need for multiple specialized valves, simplifying inventory management and system design.
Global Compatibility: Compliance with API and ANSI standards ensures the valve can be integrated into international projects, reducing barriers for export and multinational industrial applications.

Application

VI. Product Applications

TIANYU wafer lug type triple eccentric butterfly valve is widely used across industries that require reliable flow control in varying temperature and pressure conditions:

Water Treatment and Distribution: Suitable for industrial water supply, wastewater treatment, and desalination plants, where the valve’s corrosion resistance (stainless steel option) and tight sealing ensure efficient water flow control.
Petrochemical and Oil & Gas: Used in crude oil pipelines, refined product transport, and process systems handling mineral oil or hydraulic oil. The valve’s high-pressure rating (300lb) and metal sealing make it suitable for these demanding applications.
Power Generation: Ideal for steam systems in thermal power plants, where the valve’s ability to handle high temperatures (up to 425°C) and tight sealing prevent steam loss, improving energy efficiency.
Marine and Offshore: The stainless steel option is well-suited for seawater intake systems, ballast tanks, and offshore platforms, withstanding saltwater corrosion and harsh environmental conditions.
Metallurgy and Heavy Industry: Used in cooling water systems, hydraulic circuits, and process pipelines handling industrial fluids, where the valve’s durability and easy maintenance reduce operational downtime.

TIANYU wafer lug type triple eccentric butterfly valve, with 2″~36″ sizes, 150/300lb pressure, -29~425°C temp range, suits water, steam, oil, seawater. Its triple eccentric design ensures tight sealing, worm gear offers precise control. Stainless steel/carbon steel options enhance versatility. Ideal for water treatment, petrochemical, power, marine sectors. Customization (materials, sizes) available to meet specific needs.