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 |
Lever |
|
Size |
1 1/2in ~ 8in (DN40~DN200) |
|
Pressure |
10bar~20bar (1.0mpa~2.0mpa) |
|
Testing Pressure |
256psi |
|
Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
|
Medium Temperature |
-25℃~180℃ |
Material of the Valve |
|
|---|---|
|
Body |
WCB/WCC/ LCB/ LCC/ LC1 |
|
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 |
For over 20 years, our reputation has been built on 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.
Below are representative applications for this valve. As butterfly valves can be used in nearly all industrial sectors where temperature and pressure requirements are met, many industries are not listed individually.
Lug type butterfly valves with advanced coatings (epoxy/nickel) enhance corrosion resistance for petrochemical use, handling sulfur crude and acid/alkaline media.
Lug butterfly valves for power generation use bolt-fixed flanges, preventing loosening under high pressure/vibration, ensuring stability in critical systems
Water butterfly valves (lug type) offer zero-leakage soft seals for clean water and durable hard seals for abrasive media, ensuring reliability in municipal water systems
Carbon steel lug butterfly valves offer significant cost savings for large-scale shipbuilding, with a short neck design ideal for confined spaces.
Lug type valves for environmental protection feature metal hard seals and self-lubricating bushes, ensuring extended jam-free operation and minimal leakage.
Sanitary butterfly valves (handle type) feature zero-friction design for extended life and food-grade linings, ensuring FDA/3A compliance for food processing.
Carbon steel butterfly valves for mining feature wear-resistant alloy coatings and anti-corrosion hardfacing, ideal for abrasive slurries and particle-laden media
Cryogenic butterfly valves with anti-freezing stem prevent seizing at low temperatures, offering high strength (PN10-PN20) for refrigerants/cold water systems
Carbon steel Marine butterfly valves are cost-effective for seawater desalination, offering enhanced corrosion resistance via specialized coatings and durable seats
In the construction of a combined-cycle power plant, every component is scrutinized for longevity and failsafe operation. For EnergoStal Budowa, a leading Polish EPC firm, the auxiliary cooling water systems are just as critical as the main turbines. A failure here can trip the entire plant.
Building the Backbone of Industry
EnergoStal Budowa doesn't just build structures; they deliver fully operational industrial facilities. "A power plant is a 30-year commitment. We cannot afford to have 'minor' components become major problems," states Paweł Nowak, the lead commissioning engineer. "The hundreds of manually operated valves in the cooling circuits must be 100% reliable, from day one to year thirty. There's no room for compromise."
For their latest project, a 500 MW power plant, Paweł needed a carbon steel lug butterfly valve that could withstand the demanding environment: constant vibration, thermal cycling, and the need for immediate, dependable manual operation by his field technicians.
The Hidden Cost of "Standard" Carbon Steel Valves
Paweł's team had faced recurring issues with standard carbon steel valves from other suppliers. "The problems were insidious," he explains. "After a year of service, we'd see paint blistering and under-film corrosion starting at the flange edges. Worse, the stem seals would begin to weep due to the constant temperature changes, creating safety hazards. Our technicians complained about inconsistent torque; some levers were stiff, others felt loose. This unpredictability is unacceptable in an emergency shutdown scenario."
We understood that Paweł's challenge was a classic failure of mass-produced components to meet industrial-grade expectations. Our solution was a demonstration of our total process control: Our A216 WCB Carbon Steel Lug Butterfly Valve, engineered from the foundry to final assembly for maximum durability.
Our process starts with the casting's microstructure. While it's A216 WCB steel, its final properties are determined by heat treatment. Every valve body undergoes a mandatory **normalizing heat treatment at 910°C (1670°F)**, followed by controlled air cooling. **Why is this a critical, non-negotiable step?** This process refines the coarse, as-cast grain structure into a uniform, fine-grained ferrite-pearlite microstructure. This doesn't just relieve internal stresses from casting; it significantly increases the material's toughness and impact strength, making it far more resistant to the vibrations and potential pressure surges found in a power plant.
To permanently solve the corrosion issue, we moved beyond standard paint. Our valves are protected by a **three-stage coating system**. First, the normalized and shot-blasted body receives a **zinc phosphate pre-treatment** to create a micro-crystalline surface for superior adhesion. Second, a high-solids **epoxy primer** is applied, providing a robust chemical and corrosion barrier. Finally, a **polyurethane topcoat** delivers excellent UV and abrasion resistance. This system, akin to automotive finishing, prevents the under-film corrosion and blistering Paweł had experienced, ensuring long-term integrity even in a harsh industrial environment.
The weeping stem seal was a clear sign of poor engineering for thermal cycling. Our solution is a **"live-loaded" stem packing system**. Instead of simple O-rings, we use a set of V-shaped PTFE packing rings. Crucially, this packing stack is constantly energized by a set of **Belleville spring washers** located below the packing gland. **The engineering principle:** These springs exert continuous, uniform pressure on the packing, automatically compensating for thermal expansion, contraction, and material wear. This dynamic system maintains a perfect seal throughout the valve's life, eliminating the leaks caused by temperature fluctuations.
Reliable operation is a function of precision. The disc edge is CNC-machined to a smooth finish to ensure a low-friction, bubble-tight seal against the EPDM seat. But we go further. **Every single lever-operated valve undergoes a final torque test** before shipping. We verify that the breakaway and running torque values are within our strict engineering specifications. This ensures that every valve delivered to the site provides the consistent, predictable manual operation that Paweł's technicians demand and deserve.
For an EPC leader like EnergoStal Budowa, project success hinges on the predictable performance of every single component. We provided more than a valve; we provided documented proof of superior engineering. Per Paweł Nowak: "When a manufacturer can show you the 'why' behind their design—the heat treatment, the coating science, the sealing mechanics—it builds a level of trust that specifications alone cannot. It lets us focus on the larger task of commissioning a power plant, knowing our foundational components are truly reliable."
We believe that even the most "standard" components deserve world-class engineering. By controlling every stage of the manufacturing process, we deliver operational certainty to industrial projects worldwide, building a more reliable future, one valve at a time.
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?
Absolutely. Our award-winning design was specifically engineered for spatial constraints. The compact valve body and optimized handle design minimize swing radius, ensuring reliable operation even in the tightest maintenance corridors.
Yes. Our threaded holes are machined to precise ISO standards (tolerance class 6H) and verified with Go/No-Go gauges, ensuring compatibility with multiple flange standards. We also provide transition flanges for special applications.
Certainly. While our standard valve bodies use ASTM A216 WCB cast steel, we routinely accommodate special material requests, including specific grades like Q235B, A105, or cryogenic grades (e.g., A352 LCB). Please state your requirements for a feasibility assessment.
Our reinforced lug design is engineered to withstand full pipeline pressure and bending moments in end-line installations. Combined with Go/No-Go verified, precision-machined threads, we guarantee leak-free performance under unilateral loading.
Yes. In addition to standard markings (JRVAL logo, Model, DN/PN, Material, Heat No.), we offer custom laser engraving for asset IDs, pipeline codes, QR codes, or any other data required for your asset management system.
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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