Lug Butterfly Valve – WRAS EPDM Seat, Gear Operated, DN50-DN1200

Product Overview

A lug butterfly valve is a quarter-turn flow control device distinguished by its threaded lug design–threaded inserts on both sides of the valve body that allow it to be bolted directly to pipe flanges independently on each side.

Unlike wafer valves that are sandwiched between flanges and require full disconnection for removal, the lug design enables dead-end service: you can remove the valve from one side of the pipeline while the other side remains pressurized and operational. This makes it the preferred choice for systems where maintenance isolation, pipeline flexibility, and reduced downtime are critical.

This model features an EN-GJS-400-15 ductile iron body and disc, a WRAS-approved EPDM seat for safe drinking water applications, an SS431 stainless steel stem for robust torque transmission, and a worm gear operator for smooth, self-locking manual control–rated at PN25 (25 bar) and finished in RAL 3013 epoxy coating. Available in sizes from DN50 to DN1200, this valve is engineered for reliable, long-term service in water supply, wastewater treatment, HVAC, and industrial processing systems.

As a direct OEM/ODM manufacturer with over 15 years of export experience, Tianjin Worlds Valve Co., Ltd. delivers fully customizable lug butterfly valves–materials, sizes, pressure ratings, flange standards, coatings, and actuators–all tailored to your exact specifications. Our products are exported to more than 50 countries and backed by ISO 9001 (certified by LRQA), CE, UKCA, WRAS, and ACS certifications.

Introduce:

Lug Butterfly Valve | Ductile Iron Body & Disc | EPDM Seat | Gear Operated

Tianjin Worlds Valve Co., Ltd.–Your Reliable Source for Durable, Cost-Effective Flow Control

CBF02-TL01 - Detailed Product Info

Technical Specifications

This model is configured with the following parameters. Please note that every item listed below is customizable to your specific needs.

Key Features & Advantages

1. Lug Type Design–Dead-End Service & Maintenance Isolation

• Independent Pipeline Mounting–Threaded lugs on both sides of the valve body allow each side to be bolted independently to pipe flanges, enabling dead-end service–the valve can be installed at the end of a pipeline or used to isolate a section for maintenance.

• Simplified Maintenance–The valve can be removed from one side without depressurizing or shutting down the entire pipeline–a critical advantage in plants where downtime is costly.

• Superior Rigidity–The lug design provides greater structural strength than wafer types, withstanding pipe stress, vibration, and thermal expansion.

• Bidirectional Sealing–Provides reliable shut-off in both flow directions.

2. Body & Disc Material–Ductile Iron EN-GJS-400-15 (GGG40)

• High Strength–EN-GJS-400-15 offers tensile strength of ≥400 MPa and yield strength of ≥250 MPa, with minimum 15% elongation–providing reliable performance under PN25 pressure surges and thermal expansion.

• Excellent Impact Resistance–The nodular graphite structure delivers exceptional toughness, withstanding mechanical shock and pipeline vibration without fracturing.

• Corrosion Protection–Combined with RAL 3013 epoxy coating, the body and disc resist corrosion in water, wastewater, and general industrial service.

3. Seat Material–WRAS-Approved EPDM

• Drinking Water Safe–The EPDM seat carries WRAS (Water Regulations Advisory Scheme) approval, making it fully compliant for potable water supply systems in the UK and other regions requiring WRAS certification.

• Excellent Water Resistance–EPDM offers outstanding resistance to water, steam, and outdoor weathering, making it ideal for water supply, wastewater, and HVAC applications.

• Wide Temperature Range–Maintains sealing properties from -20°C to +120°C.

• Bubble-Tight Shut-Off–Provides reliable bi-directional sealing, ensuring zero leakage in both flow directions.

4. Stem Material–SS431 Stainless Steel

• High Strength–SS431 is a martensitic stainless steel offering excellent mechanical strength and toughness, with tensile strength of 800–1000 MPa–significantly higher than 304/316 stainless steel for reliable torque transmission.

• Superior Wear Resistance–The hardened surface resists galling and fretting during repeated cycling, making it well-suited for valve stem applications.

• Good Corrosion Resistance–SS431 offers the best corrosion resistance of all martensitic stainless steels, with high hardness (248–302 HB) ensuring long-term durability.

• Blow-Out Proof Design–Retention mechanism prevents accidental stem ejection under pressure surges.

5. Worm Gear Operator–Smooth, Self-Locking Control

• Self-Locking Design–The worm gear is self-locking, so the disc stays in position even under flow pressure–no additional locking devices required.

• Open-Close Position Indicator–Built-in indicator shows valve position at a glance.

• Reduced Operating Torque–The gear ratio multiplies manual input torque, making operation smooth and effortless–particularly important for larger sizes where hand lever torque is too high for comfortable operation.

• ISO 5211 Mounting–Standardized top flange allows easy upgrade to electric or pneumatic actuation if needed.

6. RAL 3013 Coating–Durable Protection & High Visibility

• Tomato Red Finish–RAL 3013 is a warm, earthy red with a muted tomato and brick undertone–a distinctly dark, saturated red (LRV = 8.47) that provides vivid visual presence.

• Superior Corrosion Protection–Epoxy resin coating provides excellent resistance to impact, abrasion, and chemical attack.

• High Visibility–The bold red finish makes the valve easily identifiable in industrial environments, supporting safety and maintenance procedures.

7. PN25 Rating–Higher Pressure Capability

• Superior Pressure Handling–Rated at PN25 (25 bar / 363 psi), this valve handles significantly higher system pressures than standard PN10/PN16 valves–ideal for high-rise building water supply, industrial processing, and pipeline systems with elevated pressure requirements.

• Durable Construction–The EN-GJS-400-15 body and SS431 stem ensure reliable operation under sustained high pressure and transient surge conditions.

• Versatile Application–PN25 compatibility expands the valve's suitability for a wider range of demanding applications, including pumped mains and pressurised distribution networks.

Typical Applications

Lug butterfly valves with EN-GJS-400-15 body, WRAS EPDM seat, PN25 rating, and gear operator are trusted across a wide range of industries:

• Water Supply & Distribution–Potable water mains, high-rise building supply, pumping stations–PN25 rating handles elevated system pressures; WRAS approval ensures drinking water safety.

• Wastewater Treatment–Sewage lines, treatment plants, effluent systems.

• HVAC Systems–Chilled water, hot water, cooling tower systems .

• Industrial Processing–General industrial water lines, cooling water, process fluids .

• Fire Protection–Fire water lines, sprinkler systems, deluge systems.

• Irrigation–Agricultural and landscape irrigation systems.

Why Choose Tianjin Worlds Valve?

• Quality you can trust. Our ISO 9001:2015 certification is issued by LRQA, one of the world's most respected certification bodies. Every valve comes with material certificates and pressure test reports–no exceptions.

• WRAS-Certified EPDM Seats. Our EPDM seats carry WRAS approval, ensuring full compliance with drinking water regulations–a critical requirement for water supply projects in the UK and other WRAS-regulated markets.

• PN25 Pressure Capability. Rated at PN25, our lug butterfly valves handle higher system pressures than standard valves–making them suitable for high-rise buildings, industrial processing, and pressurised distribution networks.

• Lug Valve Specialists. We have extensive experience manufacturing lug butterfly valves for water, industrial, and municipal projects worldwide.

• Wide Size Range. From DN50 to DN1200, we cover the full spectrum of industrial piping requirements.

• Full Customization. Materials, flange standards (ANSI, DIN, JIS, BS), coatings (any RAL color), actuators–all to your specification.

• 19+ Years Export Experience. Smooth logistics and after-sales support to 50+ countries across Europe, Americas, Middle East, and Southeast Asia.

• 100% Traceability. Material certificates and pressure test reports with every order–no exceptions.

• Quick Turnaround. Dedicated project manager; typical lead time 15–40 days. Factory visits welcome in Tianjin.

Get in Touch–Customize Your Lug Valve Today:

Whether you need this PN25 configuration with WRAS EPDM seat and RAL 3013 coating, a different size within our DN50–DN1200 range, or a fully custom design–we're ready to build to your specification.

Send us your requirements:

• Required size and pressure rating

• Media type and operating temperature

• Preferred material combination (body / disc / seat)

• Actuator type (manual, gear, electric, pneumatic, hydraulic)

• Flange standard and drilling (ANSI, DIN, JIS, BS)

• Coating color (any RAL)

• Target quantity and destination port

Our team will respond within 24 hours with a quotation and engineering proposal.

Factory visits welcome – come see how we manufacture your valves in Tianjin, China..

Contact Us Now and Let's Build Your Valve Together.