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 |
Pneumatic |
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Size |
1 1/2in ~ 48in |
|
Pressure |
10bar~20bar |
|
Testing Pressure |
256psi |
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Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
|
Medium Temperature |
-25℃~180℃ |
MATERIAL OF THE VALVE |
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|---|---|
|
Body |
GGG40/ GGG50 |
|
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 |
|
Soft Seat |
EPDM/ NBR/ SIL/ FKM/ FPM/ VITON/ PTFE/ HYPALON/ UHMWPE |
|
Coating |
Epoxy Resin 200um ~ 250um |
We integrate high-performance pneumatic actuators with our robust ductile iron valves to create a complete, factory-tested automation package. This guarantees seamless integration, rapid response, and unwavering reliability for your critical processes.
We select high-performance rack-and-pinion or scotch-yoke actuators, ensuring ample torque output with safety factors. This provides fast, decisive valve operation for both on/off and modulating control, cycle after cycle.
Our valve's top flange is machined to strict ISO 5211 standards, ensuring perfect alignment with the actuator. This eliminates side-loading on the stem, reduces wear, and guarantees smooth, efficient torque transmission for a longer service life.
Each valve and actuator assembly is fully mounted, configured with accessories like solenoids or limit switches, and cycle-tested in-house. This delivers a ready-to-install "plug-and-play" unit, saving you valuable time and labor during commissioning.
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 ISO mounting pad. This vertical integration is our promise of precision and performance.
Our pneumatic actuated ductile iron lug valves provide precise, reliable, and rapid control for a wide range of demanding industrial processes where automation is key to efficiency and safety.
For automated batching and reactor feed lines, understanding the pneumatic butterfly valve working principle is key. Our valves provide fail-safe shutoff and precise dosing, enhancing plant safety and product consistency.
In modern water treatment plants, our actuated valves, built to handle the rigors of municipal service, function as a reliable awwa butterfly valve for automated control of filter backwash cycles, chemical dosing, and main line isolation.
The fast-acting pneumatic actuator makes our valve ideal as a butterfly valve for slurry application control. It rapidly opens and closes to prevent settling and dewatering in pipelines, minimizing downtime and blockages.
For controlling large volumes of process air in industrial furnaces or ventilation systems, a pneumatically actuated large diameter butterfly valve provides efficient and rapid isolation with a much smaller footprint than gate valves.
Our valve serves a critical role as an automated isolation valve on cooling water intake and discharge lines, similar in function to a butterfly valve in hydro power plant penstocks, ensuring reliable control for essential plant utilities.
Engineered with special seals and materials, our low temperature butterfly valve is ideal for automated control of brine or glycol circuits in large-scale industrial refrigeration systems, ensuring performance down to -25°C.
As a compact, reliable lugged and tapped butterfly valve, our product is the perfect automated component for OEM skid manufacturers in dust collection, water filtration, and compressed air systems, offering simple integration.
The quintessential industrial butterfly valve for plant-wide automation. Use it on compressed air headers, process water loops, and utility lines for reliable, centralized control from your plant's control room.
While not for primary hydrocarbons, our valve is a workhorse for utility applications in the butterfly valve oil and gas industry, controlling firewater mains, service water, and tank transfer operations with reliable automation.
We pair the robust ductile iron body and reliable pneumatic actuator with a specialized selection of wetted parts (disc & seat) to provide automated control in chemically aggressive environments.
For a specialty chemical manufacturer, process safety is paramount. An uncontrolled reaction is not just a financial loss but a significant safety risk. They required an automated emergency isolation valve that was not just fast, but certifiably reliable under demanding chemical conditions.
The Client: A High-Purity Chemical Producer
The client operates a batch chemical plant where precise control over raw material feed is critical to product quality and process safety. Their Lead Process Engineer, Mr. Li, was tasked with upgrading the safety systems on their primary reactor. "Our existing manual valves were too slow to respond to a process upset," he explained. "In an exothermic reaction scenario, we need to cut the reactant feed in seconds, not minutes. The valve must be automated, fail-safe, and chemically compatible with our aggressive precursors."
For the 6-inch (DN150) reactant feed line, they needed more than a valve and an actuator; they needed a fully engineered, pre-tested, and guaranteed safety-critical assembly.
Ensuring Zero-Leakage, Fail-Safe Operation.
The client's primary challenge was three-fold: 1. **Speed:** The valve had to close from fully open in under 3 seconds upon loss of signal or plant air (fail-safe). 2. **Sealing:** It required bubble-tight (zero leakage) shutoff to prevent even trace amounts of reactant from entering the reactor post-trip. 3. **Resistance:** The valve's wetted parts had to withstand a corrosive mixture of solvents and organic acids without degradation for a 5-year service interval.
We addressed the client's challenge with a documented, multi-stage engineering protocol centered on our **Pneumatic Actuated GGG50 Ductile Iron Lug Butterfly Valve**, specifically configured for this safety instrumented function (SIF).
We began with a GGG50 (EN-GJS-500-7) Ductile Iron body, providing Material Test Reports (MTRs) certifying its chemical composition. Our process ensures **Magnesium inoculation is controlled to 0.035%-0.050%**, achieving a metallographic structure with over 90% Type I & II nodular graphite. This specification is critical for providing the toughness to withstand any potential hydraulic shock in the line, eliminating the risk of brittle fracture.
To maximize impact resistance, every valve casting underwent a **full ferritic annealing cycle.** This involved heating to **900°C for 4 hours** to dissolve any brittle cementite, followed by a slow furnace cool to **700°C and holding for 6 hours** for a complete pearlitic-to-ferritic transformation. This documented heat treatment relieves all casting stresses and develops a highly ductile ferritic matrix, guaranteeing resilience against process upsets.
To meet the chemical resistance and zero-leakage requirements, we engineered a specialized disc and seat combination. The valve was fitted with a **PTFE seat energized by a Viton® O-ring**, ensuring a constant, bubble-tight seal. The disc was cast CF8M stainless steel, but then encapsulated with a **3mm thick, chemically bonded PFA lining**. This created a fully inert wetted surface, impervious to the client's corrosive media, while the robust ductile iron body provided the structural strength.
We selected a **Spring-Return Scotch-Yoke Pneumatic Actuator**, sized with a 30% torque safety factor, configured to "Fail-Close". The assembly included a fast-acting NAMUR solenoid valve and a certified limit switch for position feedback to the plant's DCS. Crucially, the entire unit was **assembled and subjected to 100 full stroke cycles in our workshop**. We documented the closing time on the 100th cycle, providing the client with a test certificate confirming a consistent close time of 2.7 seconds, well within their safety requirement.
Our commitment to quality is verified by internationally recognized standards, providing the documentation and peace of mind you need for critical applications.
Ready to automate your process?
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.
It's delivered as a fully assembled and tested unit. We believe in providing a 'plug-and-play' automation solution. Each valve is fitted with a high-performance rack-and-pinion pneumatic actuator, correctly sized for the required torque plus a safety factor. The actuator is mounted to the valve's ISO 5211 standard top flange, and the entire assembly is cycle-tested in our workshop to ensure seamless, reliable operation right out of the box. We can also pre-install and wire accessories like solenoid valves and limit switch boxes.
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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