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 |
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Pressure |
10bar~20bar |
|
Testing Pressure |
256psi |
|
Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
|
Medium Temperature |
-25℃~180℃ |
MATERIAL OF THE VALVE |
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|---|---|
|
Body |
WCB/WCC/ LCB/ LCC/ LC1 |
|
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 seamlessly integrate high-performance pneumatic actuators with our rugged carbon steel (WCB) valve bodies to create a complete, factory-tested automation solution. Carbon steel provides superior strength and a higher temperature tolerance, ensuring rapid response and long-term reliability in demanding industrial applications.
The ASTM A216 WCB carbon steel body offers superior mechanical strength and a higher operating temperature ceiling compared to ductile iron. This makes our valves ideal for handling steam, thermal oil, and other high-temperature media, ensuring structural integrity under thermal cycling.
The valve's top flange is precision-machined to strict ISO 5211 standards, ensuring perfect alignment with the actuator. This precise fit eliminates side-loading on the stem, reduces wear, and guarantees smooth, efficient torque transmission, extending the life of the entire automated unit.
Every valve and actuator package is fully assembled, configured with accessories (like solenoid valves or limit switches), and cycle-tested in our facility. We deliver a 'plug-and-play' unit, saving you valuable on-site commissioning time and labor costs.
We never outsource quality. Our proprietary CNC machining center gives us absolute control over the tolerances and surface finish of every valve component, from the valve body to the ISO mounting pad. This vertical integration is our commitment to precision and performance.
With superior strength, temperature resistance, and reliable automation, our pneumatic carbon steel lug butterfly valves provide precise control for a wide range of heavy-duty industrial processes.
In boiler rooms and thermal oil circuits, the WCB body's resilience to heat is critical. Our high temperature butterfly valve reliably handles saturated steam and hot oils, with pneumatic actuation for rapid shutoff and regulation, ensuring system safety and efficiency.
For utility and midstream applications in the butterfly valve oil and gas industry, such as process water, cooling water, and low-pressure hydrocarbon lines in tank farms, our carbon steel valves provide a robust and reliable automated isolation solution.
In fossil fuel or cogeneration power plants, this butterfly valve used in industry plays a key role in cooling water systems, auxiliary steam lines, and Flue Gas Desulfurization (FGD) processes, where its automation capability helps optimize plant operations.
Pulping and bleaching processes involve corrosive chemicals and abrasive media. Our configurable industrial butterfly valve, with a rugged carbon steel body, withstands this harsh environment for reliable automated control of black liquor, white liquor, and steam lines.
Valves on board ships for ballast, cooling, and engine room auxiliary systems must be robust and compliant. We offer flange drillings to meet multiple marine standards, such as the butterfly valve jis 10k, ensuring stable performance in vibrating marine environments.
For moderately corrosive chemicals and solvents, our epoxy coated butterfly valves provide an extra layer of external protection. Paired with the right internal trim (e.g., SS316 disc, PTFE seat), they offer a cost-effective automation solution for reactors, tanks, and transfer lines.
Steel mills are environments of high heat, dust, and heavy loads. Our carbon steel valves provide the necessary strength for cooling water mains, coke oven gas lines, and dust collection systems. For highly corrosive zones, we can even supply a custom hastelloy valve trim inside a carbon steel body.
Large district heating networks and industrial HVAC systems require reliable flow control in large pipelines. A typical 8 inch butterfly valve in carbon steel is robust enough for the high temperatures and pressures of a heating system, enabling precise automated management of heat stations.
For OEMs building compressor skids, pump packages, and filtration systems, our valve is an ideal standardized component. As a compliant asme valve, it is easy to integrate, and its robust, automated performance enhances the value and reliability of the entire equipment package.
We leverage the rugged carbon steel body as the pressure-containing shell and pair it with specialized internal trims (disc and seat) to provide reliable automated control for chemically corrosive media.
For a large composite panel manufacturer, the stability of their thermal oil heating system is the heart of their production line. Any unplanned downtime means catastrophic production losses. They needed a totally reliable, automated valve solution to replace failing manual gate valves that were difficult to operate and prone to leakage.
The Client: A Leading Industrial Manufacturing Enterprise
At the core of the client's production is a massive thermal oil heating system, providing stable high-temperature heat to multiple hot presses. Their Equipment Supervisor, Mr. Wang, faced a critical problem. "Our existing DN200 manual gate valves were chronically leaking, both internally and externally, at 280°C," he explained. "This not only caused costly thermal fluid loss, but worse, repairs required a full system cooldown and shutdown—a full day of lost production. We needed a 'zero-leak' solution that could handle the heat and be operated remotely and quickly."
They didn't just need a valve; they needed an engineered product, meticulously designed and verified from material science and heat treatment through to final assembly, guaranteeing long-term service life.
Ensuring structural stability and zero leakage under severe thermal conditions.
The challenges were multifaceted: 1. **High-Temperature Performance:** The valve had to maintain its mechanical strength and dimensional stability at continuous operating temperatures up to 280°C. 2. **Thermal Cycling:** Frequent system startups, shutdowns, and temperature fluctuations created immense stress on materials and sealing structures, the primary cause of leakage. 3. **Absolute Sealing:** Zero leakage, both internally (media flow) and externally (stem), was mandatory for safety and economy.
Instead of just supplying a standard product, we initiated a complete engineering protocol centered on our purpose-built **Pneumatic WCB Lug Butterfly Valve**.
We specified raw material compliant with **ASTM A216-WCB**, providing full Material Test Reports (MTR). We precisely controlled the chemical composition during casting, especially keeping carbon content between 0.22%-0.25% for optimal high-temperature strength and weldability. Metallographic analysis ensured the castings were free of internal defects like shrinkage or inclusions, eliminating potential failure points at the source.
To relieve casting stress and optimize mechanical properties, every single valve body casting underwent a strict **Normalizing heat treatment**. The castings were heated to **915°C (±10°C)**, held for 4 hours to achieve full austenitization and a fine, uniform grain structure, and then air-cooled. This precisely controlled process significantly increased the material's yield strength and impact toughness, making it resilient to pressure fluctuations and thermal shock.
Using our CNC machining center, we machined the valve body's seat pocket and sealing surfaces to a dimensional tolerance of ±0.05mm and a surface finish of Ra 1.6. For the high-temperature application, we abandoned soft seals in favor of a **multi-layered Flexible Graphite** packing system with a **SS316 stainless steel disc**. This combination leverages graphite's high-temperature resistance and self-lubricating properties to create a dynamic, self-compensating seal that adjusts to thermal cycles, achieving zero leakage.
We selected a heavy-duty Scotch-Yoke pneumatic actuator with a torque output 40% higher than the calculated requirement, to overcome any increased operating torque at high temperatures. The complete valve and actuator assembly was subjected to a **hydrostatic shell test at 1.5x the nominal pressure** and a **pneumatic seat test at 1.1x the nominal pressure** on our test bench, followed by 50 full high-temperature open/close cycles simulating site conditions. We delivered a complete quality dossier to Mr. Wang, including MTRs, heat treatment graphs, and pressure test reports.
Our commitment to quality is verified by internationally recognized standards, giving you the documentation and confidence you need for your critical applications.
Ready to upgrade your process?
The primary driver is temperature and pressure. Carbon Steel (ASTM A216 WCB) is essential for high-temperature services like steam, thermal oil (up to 425°C), and high-pressure industrial processes where Ductile Iron is unsuitable. WCB maintains its structural integrity and strength at elevated temperatures, providing a critical safety and performance advantage.
WCB is an ASTM designation for weldable cast carbon steel, the industry standard for strength and reliability. The critical step is Normalizing heat treatment. We heat the raw casting to over 900°C and then air-cool it. This process refines the grain structure, relieves internal stresses, and significantly increases the valve's toughness and resistance to thermal shock.
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, power stations, and complex piping networks.
Our standard is a robust multi-layer industrial epoxy paint system. However, the key strategy for corrosive media is to use the WCB body for strength and combine it with a corrosion-resistant disc and seat. For example, using a Stainless Steel 316 or Duplex Steel disc provides excellent internal protection at a lower cost than a full stainless steel valve.
It is delivered as a fully assembled and factory-tested unit. We professionally mount the correct-sized pneumatic actuator to the valve's ISO 5211 standard top flange and perform multiple cycle tests. This 'plug-and-play' approach guarantees perfect alignment and reliable performance, saving you significant time and potential errors during on-site installation.
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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