30" Lug Butterfly Valve — Undercut Disc Design, Low Torque

1. Product Overview

The 30-inch (DN750) lug type butterfly valve from Laux Valve features an advanced undercut disc design specifically engineered to reduce operating torque while maintaining reliable bi-directional sealing. This innovative disc profile minimizes fluid dynamic resistance during opening and closing, resulting in smoother operation, smaller actuator sizing, and significant energy savings over the valve's service life.

Built on a robust ductile iron body with a precision-molded EPDM or PTFE seat, this large-diameter lug butterfly valve delivers dead-end service capability at full rated pressure per Class 150 (PN10/PN16). The lug-style body with threaded bolt inserts enables secure installation and allows downstream piping removal for maintenance without system depressurization — a critical advantage for large-diameter pipeline systems.

Manufactured and tested in accordance with API 609, EN 593, and MSS SP-67 standards, this valve is ideal for municipal water distribution, wastewater treatment, power generation, and industrial processing applications where large-diameter flow control with low operating torque is critical.

2. Key Features & Benefits

• Undercut Disc Design — Low Torque Operation: The hydrodynamically optimized undercut disc profile significantly reduces operating torque compared to standard concentric disc designs. Break torque is reduced by approximately 35% and dynamic torque by up to 45%, enabling smaller actuator selection, lower energy consumption, and extended actuator service life. The undercut profile also improves throttling characteristics for modulating control applications.
• 30-Inch (DN750) Large Diameter: Designed for high-flow municipal water supply, wastewater, and industrial pipeline systems. The full-bore design minimizes pressure drop across the valve, reducing pumping costs and improving overall system energy efficiency.
• Lug Style Body — Dead-End Service: Threaded bolt inserts on both flanges allow dead-end service at full rated pressure per Class 150. This enables complete isolation of one side of the pipeline for maintenance, repair, or expansion without shutting down the entire system. Ideal for end-of-line and isolation applications.
• Bi-Directional Class VI Shut-Off: Precision-molded seat provides bubble-tight bi-directional sealing in accordance with ANSI FCI 70-2 Class VI, ensuring zero leakage and maximum system efficiency.
• ISO 5211 Top Flange — Direct Actuator Mounting: Standardized mounting pad allows direct installation of gearboxes, pneumatic actuators, or electric actuators without additional brackets or adapters, simplifying procurement and installation.
• Anti-Blowout Stem Design: One-piece stainless steel stem with anti-blowout retention feature ensures the stem remains securely retained within the valve body even under high-pressure conditions, providing maximum operational safety for personnel and equipment.
• Heavy-Duty Epoxy Coating: The ductile iron body is coated with high-build epoxy paint (standard RAL 5015 blue, 120-150 microns thickness) for exceptional long-term corrosion protection in water and wastewater environments.
• Full Material Traceability: Every valve receives a unique serial number with complete traceability of raw material certifications, dimensional inspection records, and hydrostatic test reports.
• OEM/ODM Customization Available: Custom disc coatings, stem extensions, special testing, third-party inspection, and custom packaging available on request.

3. Technical Specifications

4. Torque Reduction — Undercut vs Standard Disc

5. Typical Applications

• Municipal water supply and distribution
• Wastewater treatment plants
• Power plant cooling water systems
• Large-diameter HVAC systems
• Industrial process pipelines
• Desalination plants
• Mining and slurry handling
• Agricultural irrigation networks

6. Standards & Certifications

• Design: API 609, EN 593, MSS SP-67
• Flange: ASME B16.5 Class 150
• Testing: API 598
• ISO 9001:2015 Quality Management
• CE / UKCA Available

7. How to Order

1. Size: 30\" / DN750
2. Pressure: Class 150 / PN16
3. Disc Material: Ductile Iron / CF8M
4. Seat Material: EPDM / NBR / PTFE
5. Operation: Gearbox / Pneumatic / Electric
6. Quantity and delivery schedule

8. Contact Laux Valve