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 |
|
|---|---|
|
Type of Connection |
Lug (NPT/ Through Hole Connection) |
|
Actuation |
Worm Gear |
|
Size |
1 1/2in ~ 48in |
|
Pressure |
10bar~20bar |
|
Testing Pressure |
256psi |
|
Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
|
Medium Temperature |
-25℃~180℃ |
MATERIAL OF THE VALVE |
|
|---|---|
|
Body |
GGG40/ GGG50 |
|
Disc |
DI/ CF8/ CF8M/ CF3/ CF3M/ 2205/ 2507/ 1.4529/ HC276/ C95400/ C95800 |
|
Stem |
45#/ SS410/ SS416/ SS420/ SS304/ SS316/ SS316L/ 17-4/ 2205/ 2507/ 1.4529/ K500/ CF8/ CF8M/ HC276 |
|
Soft Seat |
EPDM/ NBR/ SIL/ FKM/ FPM/ VITON/ PTFE/ HYPALON/ UHMWPE |
|
Coating |
Epoxy Resin 200um ~ 250um |
We leverage the superior properties of ductile iron through meticulous engineering. From foundry control to final coating, our worm gear lug valves are built for high-stress applications where strength, toughness, and long-term reliability are non-negotiable.
We start with high-purity GGG50, ensuring optimal graphite nodularity for exceptional tensile strength and impact resistance. Every valve features deep-cast, permanent markings for full traceability of material, pressure, and heat number.
Our CNC machining ensures precise compatibility with multi-national flange standards (ASME, DIN, JIS). Every threaded lug hole undergoes strict Go/No-Go gauge inspection, guaranteeing reliable bolt connections and uniform gasket sealing.
Our space-optimized, compact valve body design minimizes installation footprint while exceeding structural strength standards. A premium, fusion-bonded epoxy coating provides robust, long-lasting protection against corrosion and abrasion.
We don't outsource quality. Our own CNC machining center gives us absolute control over the tolerance and finish of every valve component, from the valve body to the gear housing. This vertical integration is our promise of precision.
The superior strength and ductility of GGG50 make this valve the definitive choice for critical infrastructure and demanding industrial applications where safety, pressure handling, and long service life are paramount.
For urban water distribution networks, the high tensile strength of our ductile iron butterfly valve provides a crucial safety factor against water hammer and ground stress, ensuring decades of reliable service in buried pipelines.
In aeration basins and effluent lines, our valves equipped with a resilient epdm seat butterfly valve design offer excellent resistance to the chemicals and solids found in municipal wastewater, preventing leaks and ensuring process integrity.
For main water lines in large-scale irrigation systems, the durability and cost-effectiveness of a 6 inch butterfly valve in ductile iron make it the ideal choice for controlling water flow from pumps and reservoirs, season after season.
The ductile iron body is specified for large commercial HVAC projects. As a butterfly valve for chilled water system applications, it easily handles condensation and provides reliable isolation for chillers, pumps, and air handling units.
For controlling process water and tailings with low solids concentration, a rubber lined butterfly valve with a ductile iron body offers superior abrasion resistance and toughness compared to standard cast iron, extending service life in harsh mining environments.
Meeting stringent marine standards, our jis 10k butterfly valve is used extensively in ballast, bilge, and engine cooling systems. The ductility of the body material provides critical resistance to ship vibration and mechanical shock.
We pair the robust ductile iron body with a carefully selected range of seats and coatings to deliver reliable, long-term performance in various corrosive and challenging media.
For a major Metropolitan Water Authority, maintaining an aging urban water network presents immense challenges. When a critical main valve failure can disrupt service to thousands, "good enough" is not an option. They require an engineered solution built on material science and manufacturing precision.
The Client: A Guardian of Urban Lifelines
The Metropolitan Water Authority manages hundreds of kilometers of large-diameter water mains buried beneath bustling city streets. Their Chief Engineer, Mr. Chen, oversees a multi-decade infrastructure upgrade program. "Our biggest enemy is time and pressure," he states. "Older gray cast iron valves in our network are nearing the end of their life. A single failure from a pressure surge, or 'water hammer,' can cause a catastrophic rupture, leading to costly emergency excavations and public safety hazards."
For a planned replacement of a 24-inch (DN600) isolation valve at a critical network junction, the Authority needed more than just a valve; they needed a guarantee of long-term, failure-proof performance.
Preventing Catastrophic Brittle Fracture.
The Authority's primary concern was the inherent brittleness of their old gray iron valves. Modern pumping systems with variable frequency drives (VFDs) can induce rapid pressure changes, creating shockwaves that older materials cannot withstand. "We've seen old valves shatter," Mr. Chen admits. "The replacement had to be fundamentally tougher and designed to absorb, not resist, these dynamic forces. It also needed to be flawlessly sealed and protected from corrosion for a 50-year service life."
We addressed the Authority's challenge not with an off-the-shelf product, but with a documented, multi-stage engineering protocol centered on our **Worm Gear Operated GGG50 Ductile Iron Lug Butterfly Valve.**
We began with the base material. The valve body was cast from GGG50 (EN-GJS-500-7) Ductile Iron. We provided Material Test Reports (MTRs) certifying the chemical composition, but went further by detailing our foundry process: **Magnesium inoculation was precisely controlled to a range of 0.035%-0.050%**, ensuring a metallographic structure with over 90% Type I & II nodular graphite. This specification is critical to achieving maximum ductility and eliminating the risk of brittle fracture.
To maximize impact resistance, every valve casting underwent a **full ferritic annealing cycle.** This involved heating the casting to **900°C and holding for 4 hours** to dissolve any brittle cementite, followed by a slow furnace cool to **700°C and holding for an additional 6 hours** to ensure a complete pearlitic-to-ferritic transformation. This specific heat treatment relieves all casting stresses and develops a highly ductile ferritic matrix, resulting in a Charpy V-notch impact strength exceeding 18 Joules at room temperature—a value that guarantees resilience against severe water hammer.
The annealed body was then machined on our 5-axis CNC centers. The valve seat interface was machined to a **surface roughness of Ra 1.6 μm**, creating a perfect surface for the valve's primary seal. We paired this with a **WRAS-certified EPDM seat**, ensuring a bubble-tight, low-torque seal that is safe for potable water and resistant to long-term compression set. The concentricity between the stem bore and seat was controlled to within 0.05mm to prevent uneven seat wear.
Our commitment to quality is verified by internationally recognized standards, providing the documentation and peace of mind you need for critical applications.
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The primary reason is safety and durability. Ductile Iron (DI) possesses superior tensile strength and ductility, allowing it to bend and deform under stress rather than shattering. This makes it highly resistant to brittle fracture from system pressures, ground settlement, or water hammer—a critical advantage in water supply, fire protection, and buried applications.
Both are excellent ductile iron grades. GGG40 (EN-GJS-400-15) is the standard, offering good strength and high elongation (toughness). GGG50 (EN-GJS-500-7) provides significantly higher tensile strength with slightly less elongation. We recommend GGG50 for higher pressure applications (e.g., PN25) or systems with greater mechanical stress, while GGG40 is a robust and reliable choice for most PN10/16 applications.
The key benefit is its suitability for dead-end service. Each threaded lug hole allows the valve to be bolted to one flange while the other side of the pipeline is removed for maintenance. This isolates a section of the system without needing to drain the entire line. This feature is invaluable in industrial plants and complex piping networks.
Our standard protection is a high-performance Fusion Bonded Epoxy (FBE) coating, typically applied at a thickness of 250 microns. The valve body is heated and the epoxy powder is electrostatically applied, creating a durable, holiday-free barrier that provides excellent resistance to water, chemicals, and abrasion. For seawater or highly corrosive media, we offer specialized disc materials like Duplex Stainless Steel or Bronze.
Yes, absolutely. The worm gear provides precise, low-torque operation and is self-locking, which prevents disc flutter. Crucially, it features a standardized ISO 5211 top mounting flange. This universal standard allows for the easy and direct installation of electric or pneumatic actuators, making it simple to integrate our valves into automated or remotely controlled systems.
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, seat, and gear operator 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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