Superior Material Composition: Our valves are cast with chemical compositions at the highest end of international standards. For example, our ASTM A351 CF8 stainless steel contains 9% Nickel—the maximum allowable—to ensure superior corrosion resistance and extended service life.
Lug Hole Positional Accuracy: The true position of our threaded lug hole pattern is precisely controlled to an exacting tolerance of ±0.10 mm relative to the valve centerline.
100% Gauge Verification: To validate this precision, every valve's lug holes are 100% inspected with certified go/no-go gauges.
Premium raw steel finish with corrosion-resistant coating; deep-cast permanent markings for full traceability (material, pressure, heat number).
Design and Manufacture: ASME B16.34; ASME VIII; API 609:AS2129 JISB2220
Leakage Class: API 598 (Bi-directional Zero Leakage)
Side Flange Standards: ANSI 125LB/ 150LB; ASME; AS-D/E; BS; DIN; EN PN6/ PN10/ PN16; GB; GOST; HG/T; JIS 5K/ 10K
Top Flange (Actuator Mounting) : ISO 5211; GB 90°
Face-to-Face Dimension: ISO 5752; MSS SP-68; ASME B16.10; EN 558-1; API 609
Testing Standards: API 598; EN 12266-1; ISO 5208; BS 6755-1
Certifications: ISO 9001; CE; BV; API 609; API 598; EAC; SIL3；
Technical description
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Q&A
Specification of the Valve |
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|---|---|
|
Type of Connection |
Lug (NPT/ Through Hole Connection) |
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Actuation |
Round/Square Head |
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Size |
1 1/2in ~ 48in (DN40~DN1200) |
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Pressure |
10bar~20bar (1.0mpa~2.0mpa) |
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Testing Pressure |
256psi |
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Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
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Medium Temperature |
-25℃~180℃ |
Material of the Valve |
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|---|---|
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Body |
GGG50/ GGG40 |
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Disc |
DI/ CF8/ CF8M/ CF3/ CF3M/ 2205/ 2507/ 1.4529/ HC276/ C95400/ C95800 |
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Stem |
45#/ SS410/ SS416/ SS420/ SS304/ SS316/ SS316L/ 17-4/ 2205/ 2507/ 1.4529/ K500/ CF8/ CF8M/ HC276 |
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Soft Seat |
EPDM/ NBR/ SIL/ FKM/ FPM/ VITON/ PTFE/ HYPALON/ UHMWPE |
|
Coating |
Epoxy Resin 200um ~ 250um |
For over 20 years, our reputation has been built on a foundation of deep material expertise and precision engineering. We control the entire process, from raw casting to final assembly, ensuring every valve meets our uncompromising standards.
Founded by a casting expert, we guarantee material integrity. We use PMI testing to verify alloys, ensuring every valve body strictly adheres to ASTM/EN standards for optimal performance and longevity.
Our state-of-the-art CNC centers ensure every component's dimensions are machined to exact specifications. This precision is critical for the perfect fit and flawless operation of the valve assembly, guaranteeing reliability.
With two decades of field validation, our valve designs are not just theoretical; they are proven to be rational and reliable. This extensive experience means our products deliver consistent, trustworthy performance.
Our bare stem ductile iron lug butterfly valves offer an unmatched combination of strength, durability, and cost-effectiveness, making them the industry standard for critical water, waste, and utility systems primed for automation.
The high tensile strength of GGG50 makes our ductile iron butterfly valve the ultimate choice for municipal water mains. Ready for actuation, it provides reliable, long-term service under constant pressure in urban water grids.
Engineered to handle abrasive media, the robust ductile iron body paired with a resilient rubber seat butterfly valve ensures tight shutoff and process control in primary and secondary treatment stages, ready for integration into SCADA systems.
The dimensional stability of our ggg50 butterfly valve makes it ideal for automated temperature and flow control in large-scale HVAC and district heating loops, reliably handling thermal cycling from chilled to hot water.
In critical life-safety systems, reliability is paramount. Our fully lugged butterfly valve provides secure, dead-end service capability and is the perfect platform for supervisory-controlled actuators in automated fire suppression networks.
With superior toughness and abrasion resistance, the di butterfly valve body is built for the harsh conditions of mining. It provides a solid base for high-torque actuators needed to control abrasive slurry and tailings lines.
For large-volume water control, our valves offer a durable and economical solution. The standard pn10 butterfly valve is easily automated for efficient water management in large-scale agricultural irrigation systems.
As a versatile workhorse, our industrial butterfly valve in ductile iron is a prime choice for plant utility lines, including compressed air, process water, and other non-corrosive fluids where strength and reliability are key.
In pre-treatment and intake stages of desalination, our heavy-duty epoxy coated butterfly valves provide excellent protection against low-salinity corrosion, offering a durable, automated flow control solution.
The robust lug body butterfly valve ensures secure installation in vibration-prone environments. It's the standard for automated onboard utility systems like ballast, bilge, and engine cooling water lines.
For an Original Equipment Manufacturer (OEM), the quality of their final product is the sum of its parts. For Han-Kyul Water Solutions, a premier South Korean builder of containerized water purification skids, every integrated component must be a zero-failure foundation, because their brand reputation ships with every unit.
Building Systems, Not Just Assembling Parts
Han-Kyul exports sophisticated, automated water treatment systems worldwide. "Our clients in different regions specify different control systems and actuators. Our job is to deliver a reliable, integrated skid," explains Kim Min-jun (김민준), Han-Kyul's Lead Integration Engineer. "The butterfly valve body is our chosen foundation for flow control. If the valve's dimensions are off, or its material is unstable, our entire automation and assembly process is compromised."
Han-Kyul needed a bare-stem lug butterfly valve supplier who could provide not just a part, but a guarantee of mechanical and material perfection, ready for seamless integration with any actuator they chose.
The "Bare Stem Nightmare": Dimensional Inconsistency and Material Instability
Mr. Kim's team faced critical issues with previous suppliers. "We were fighting a battle on two fronts," he recalls. "First, the flange compatibility. A valve advertised as 'multi-standard' would cause alignment issues with JIS flanges on one project, and ANSI on another. Second, and more critical, were the bare stem dimensions. An inconsistent square drive on the stem head meant our actuators wouldn't mount correctly, causing production delays and potential shearing failure in the field. It was an integrator's nightmare."
We understood that for an OEM like Han-Kyul, a valve is not a final product but a critical raw component. Our solution was a demonstration of our deep manufacturing control, governed by our ISO 9001 certified processes: Our EN-GJS-500-7 (GGG50) Ductile Iron Bare-Stem Lug Butterfly Valve.
To ensure the valve body is a stable, reliable foundation, our EN-GJS-500-7 castings undergo a mandatory **ferritizing annealing heat treatment**. By slow-cooling the castings through the ~730°C (1350°F) eutectoid range, we ensure the breakdown of brittle cementite into a **fully ferritic microstructure**. **Why is this critical for an OEM?** This process eliminates internal stresses and maximizes impact toughness, guaranteeing that the valve body's dimensions will remain stable during their assembly process and throughout its operational life, preventing delayed-onset distortions or failures.
We solve the flange compatibility issue through precision machining. Instead of a loose "universal" design, our lug bodies are CNC-machined to a precise Pitch Circle Diameter (PCD) that represents the **mathematical median of ANSI 150, DIN PN16, and JIS 10K standards**. With a machining tolerance of ±0.2mm on hole positions, we guarantee interference-free bolt alignment across all major international standards, a crucial feature for a global exporter like Han-Kyul.
Our promise of bi-directional zero-leakage in a centric design comes from obsessive control over the disc and seat geometry. The spherical profile of the disc edge is CNC-machined to a tolerance of **±0.05mm**. The EPDM seat is molded with a precisely corresponding profile to create a **perfectly uniform 360-degree interference fit**. This calculated compression ensures that line pressure, from either direction, only serves to further energize the seal against the disc, guaranteeing a bubble-tight shutoff every time.
For a bare-stem valve, the stem head is the most critical interface. We treat it as a precision-machined component. The square drive is milled to **ISO 5211 standards with a dimensional tolerance of ±0.1mm**. Whether Han-Kyul needs a square head for a pneumatic actuator, or a D-drive (flat-round) for an electric one, each is machined with the same exacting precision. This guarantees a perfect, no-slop fit with their chosen actuator, eliminating the risk of connection failure and ensuring accurate flow control.
For an OEM like Han-Kyul Water Solutions, innovation depends on the reliability of their supply chain. They found a partner who provides not just parts, but certainty. Our ISO 9001 framework ensures that every valve is a product of a controlled, repeatable, and documented process. Per Mr. Kim: "Their control over the fundamental engineering—from heat treatment to the final machining of the stem—allows us to focus on our core competency: designing world-class water purification systems."
We empower the world's leading equipment manufacturers by providing an unshakeable foundation of quality. We believe that by perfecting our components, we enable our partners to build a better, more reliable future.
Our commitment to quality is verified by internationally recognized standards, providing the documentation and peace of mind you need for critical applications.
Ready to configure for your project?
The primary advantage is superior strength and ductility. Unlike the brittle flake graphite in cast iron, the spheroidal graphite in GGG50 ductile iron allows it to bend and deform under stress rather than fracturing. This makes it far more resistant to system pressures, physical impacts, and water hammer, ensuring higher safety and a longer service life in critical applications like water mains and fire protection systems.
Absolutely. The inherent toughness of ductile iron ensures the tapped lugs are exceptionally robust. They are designed to withstand the high installation torques and cyclical loads from pneumatic or electric actuators without stripping. Every lug undergoes precision tapping and go/no-go gauge inspection to guarantee thread integrity, ensuring reliable dead-end service and secure mounting for the valve's entire lifespan.
Yes, it is the ideal choice for buried service. Its suitability comes from two key features: 1) The ductile iron body has excellent resistance to soil stress and ground shifting. 2) We apply a thick, 250-micron minimum fusion bonded epoxy (FBE) coating, which provides a durable, holiday-free barrier against soil corrosion and moisture. This combination ensures long-term, maintenance-free reliability.
Its versatility comes from a combination of a robust base and customizable internals. The epoxy coated ductile iron body provides a strong, economical, and well-protected foundation. We then match the wetted parts to your specific media. A standard EPDM seat is perfect for water, while options like NBR, Viton®, or PTFE seats, paired with Stainless Steel or Duplex discs, can handle a wide range of chemicals and temperatures.
Integration is seamless. The valve is equipped with a top flange that is fully compliant with the ISO 5211 standard, ensuring universal compatibility with standard electric and pneumatic actuators. The robust stem, available with a square head or keyed drive, provides a secure, non-slip connection for reliable torque transmission. Please request our torque chart to correctly size your actuator, ensuring a safety factor of at least 30%.
As a source factory integrating casting, machining, and assembly, JRVAL's product reliability has been verified by the market for over 20 years.
Compare our products against other brands before you commit. We're confident you'll be satisfied after an in-depth investigation.
We provide a comprehensive 2-year warranty covering non-human damage. Spare parts for the valve body, disc, and seat are readily available.
Before delivery, we provide complete documentation, including material test reports, heat treatment reports, and mechanical performance tests.
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Address: DaZhan Industrial Park, Xiaozhan Town, Jinnan District, Tianjin, China
Copyright @ 2025. Tianjin Jiangrui Steel Casting Co., Ltd.
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