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.
Surface Integrity: Our castings are guaranteed to be free from surface porosity, shrinkage, or unauthorized weld repairs, ensuring maximum material strength and pressure-holding capability.
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
Download
Q&A
Specification of the Valve |
|
|---|---|
|
Type of Connection |
Lug (Threaded Holes) |
|
Actuation |
Worm Gear (Handwheel) |
|
Size |
1 1/2in ~ 48in (DN40~DN1200) |
|
Pressure |
PN6/PN10/PN16 (Class150) |
|
Testing Pressure |
1.5 x Rated Pressure |
|
Medium |
Water, Oil, Gas, Steam, Corrosive Fluids |
|
Medium Temperature |
-40℃~200℃ (Depends on seat material) |
Material of the Valve |
|
|---|---|
|
Body |
CF8/ CF8M/ CF3/ CF3M/ 2205/ 2507/ 1.4529/ 1.4406 |
|
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 |
|
Seat |
EPDM/ NBR/ SIL/ FKM/ FPM/ VITON/ PTFE/ HYPALON/ UHMWPE |
|
Worm Gearbox |
Ductile Iron, Cast Steel, Stainless Steel |
Our lug valve bodies are produced from a high-density casting process. This ensures a solid, non-porous structure, completely free from sand holes and other casting defects. The result is superior strength and maximum durability you can rely on.
Learn More About Our ProcessThe worm gear actuator provides high torque and precise, slow-speed operation, making this valve ideal for large pipelines and applications requiring fine-tuned flow control or prevention of water hammer.
In large municipal water mains, the slow and controlled closing of the water butterfly valve prevents devastating water hammer effects, protecting the entire pipeline network.
The self-locking feature of the worm gear is critical for maintaining a stable opening, ensuring precise dosing and mixing of chemicals. A reliable choice for any industrial butterfly valve application.
For cooling water intake systems (up to DN1200), the high torque output of the gearbox easily operates the large disc against high flow rates, making it a standard PN16 butterfly valve for this sector.
The worm gear allows for precise balancing of hot and chilled water loops in large commercial buildings. This HVAC butterfly valve ensures optimal energy efficiency across the system.
In ballast and bilge systems, the high mechanical advantage of the worm gear allows for reliable manual operation of large valves, a crucial feature for any marine butterfly valve in demanding sea conditions.
For throttling control of purified water (WFI) or buffer solutions, the smooth operation of a butterfly valve ss316 with a worm gear prevents agitation and maintains fluid integrity.
The robust gearbox can overcome the resistance of viscous slurries. When fitted with an abrasion-resistant seat, this high temperature butterfly valve can also handle hot process water with solids.
The worm gear provides the necessary force to cut through and seal against fibrous media. An EPDM seat butterfly valve is typically used for its excellent performance with water-based stock.
For terminal and storage tank isolation, the lugged design and gear operation provide secure shut-off and easy maintenance, fully compliant as an ASME valve for these applications.
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 casting 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.
With two decades of field validation, our valve designs are not just theoretical; they are proven to be rational and reliable, delivering consistent, trustworthy performance in real-world conditions.
In high-purity chemical manufacturing, process integrity is absolute. For AcuChem Synthesis, a leader in pharmaceutical-grade solvents, any metallic contamination or operational failure in a fluid line means a multi-million dollar batch is lost. The valve isn't just a component; it's a guardian of product purity and plant safety.
More Than a Chemical Plant... A High-Stakes Purity Guardian
AcuChem doesn't just mix chemicals; they synthesize molecules where purity is measured in parts per million. "Our final product's value is directly tied to its purity. A single compromised valve can introduce metallic ions or fail to isolate, contaminating an entire production run," explains Sarah Jenkins, Head of Process Engineering. "We operate in a state of controlled, predictable chemistry. Unpredictable hardware is our biggest liability."
For a new production line handling highly corrosive chlorinated solvents, AcuChem needed an isolation valve that offered not just corrosion resistance, but a guarantee against the common failure modes of stainless steel in demanding service: galling, crevice corrosion, and seal degradation.
When "Stainless" Isn't Enough: The Nuances of Material Failure
The stakes are microscopic but the consequences are massive. AcuChem's previous supplier's 316 Stainless Steel valves were failing prematurely. "We saw two major issues," Jenkins states. "First, stem galling. The valves would seize after a few cycles, requiring dangerous levels of torque to operate. Second, we detected pitting and crevice corrosion at the disc-seat interface during maintenance. This wasn't just a maintenance headache; it was a direct threat to our product's integrity. We needed a partner who understood metallurgy, not just part numbers."
AcuChem's challenge was a classic case where standard specifications fall short. Our response was a solution engineered from the atomic level up, demonstrating our foundry-level control: Our CF8M (316 SS) Lug Butterfly Valve, optimized for critical chemical service.
Standard CF8M is not our standard. We begin by controlling the melt. We specify a **Molybdenum (Mo) content of 2.5-3.0%** (exceeding the 2.0% ASTM A351 minimum) and a **Carbon (C) content below 0.03%**. After casting, every valve body undergoes a mandatory **solution annealing heat treatment: heated to 1060°C (1940°F), held for 2 hours per inch of thickness, followed by a rapid water quench.** **Why is this vital?** This process dissolves any chromium carbides that may have formed at the grain boundaries, preventing sensitization and intergranular corrosion. The rapid quench locks in a uniform austenitic microstructure, maximizing the valve's resistance to the pitting and crevice corrosion AcuChem was experiencing.
To solve the critical problem of stem galling (cold welding), we employ a materials engineering solution. While the disc is CF8M, the stem is machined from **Nitronic 50 (UNS S20910)**, a nitrogen-strengthened austenitic stainless steel. **The science behind this choice:** Nitronic 50 possesses superior hardness and a different surface crystal structure than standard 316 SS. This material dissimilarity, combined with a **stem surface finish polished to Ra < 0.4 μm**, creates a low-friction, non-reactive pairing that virtually eliminates the risk of galling, ensuring smooth, predictable torque even after prolonged static periods in a corrosive environment.
For AcuChem's aggressive solvents, a standard elastomer seat would quickly degrade. We specified a **virgin, glass-filled PTFE seat**. The virgin PTFE provides a broad range of chemical inertness, while the **25% glass fill** provides crucial dimensional stability, preventing seat creep under pressure and temperature fluctuations. Furthermore, the full lug body's thread holes are **100% verified with Go/No-Go gauges**, ensuring uniform bolt tension. This precise gasket compression is critical for preventing fugitive emissions—a key safety and environmental concern in chemical plants.
A reliable valve is useless if its operator corrodes. The robust IP67-sealed worm gear operator is protected by a **three-stage coating process**: first, a zinc-phosphate pretreatment, followed by an epoxy powder primer, and finished with a high-solids polyurethane topcoat. This system is specifically designed to withstand the harsh chemical vapors and frequent wash-down cycles typical of a chemical processing facility, guaranteeing the actuator's integrity for the life of the valve.
AcuChem Synthesis found a partner who speaks the language of material science. Our foundry-level control and obsession with engineering detail mean we can deliver solutions for the most demanding applications. Per Sarah Jenkins: "Knowing that our valves are not just assembled, but are fundamentally engineered against specific failure modes like corrosion and galling, allows my team to focus on process optimization, not crisis management."
For over 20 years, we have been the silent, reliable partner inside the world’s most critical process industries. We empower engineers like Sarah to push the boundaries of science and manufacturing, secure in the knowledge that our components provide the unshakeable foundation for their innovations.
Our commitment to quality is verified by international standards, ensuring our products are trusted worldwide.
Ready to configure for your project?
The worm gear provides a high mechanical advantage, allowing for smooth, precise, and low-effort operation on large diameter valves or in high-pressure systems. Its key feature is being self-locking, meaning it holds the valve disc securely in any position without needing a separate brake, preventing accidental movement due to flow pressure.
Absolutely. The fully lugged body design with threaded holes allows the valve to be installed at the end of a pipeline without a downstream flange. This enables dead-end service, allowing for downstream pipe removal and maintenance while the valve remains under pressure, a critical feature for system isolation.
Our lug valves are engineered for multi-national flange standards compatibility. We precisely machine the lug bodies to match universal standards or specific customer requirements like ANSI B16.5, DIN EN 1092, or JIS. Each threaded hole is verified with Go/No-Go gauges to guarantee a perfect, trouble-free connection on-site.
We provide full traceability through deep-cast permanent markings on the valve body, which include the material grade (e.g., CF8M), pressure rating, and a unique heat number. This heat number corresponds to a Material Test Report (MTR) that details the chemical and mechanical properties of the specific raw steel batch used.
Yes. Our valve features a space-optimized compact design. We've minimized the valve body's face-to-face dimension and overall profile, often winning awards for our design efficiency. This allows for installation in tight spaces without compromising the structural strength or performance required by industry standards.
JRVAL is the source factory for steel butterfly valves. We integrate casting, precision machining, and final assembly, a process refined and market-proven over 20 years for unmatched reliability.
Precision multi-national flange standards compatibility; strict thread hole control via go/no-go gauge inspection for reliable connections.
Space-optimized compact design (award-winning): minimizes valve body profile while exceeding structural strength standards for tight spaces.
Premium raw steel finish with corrosion-resistant coating; deep-cast permanent markings for full traceability (material, pressure, heat number).
JRVAL is the source factory for the production of steel butterfly valves, which integrates casting, machining and assembly, and the reliability and rationality of its products have been verified by the market and facts for 20 years.
Product Category
Quick link
Industries
Products
Contact
Address: DaZhan Industrial Park, Xiaozhan Town, Jinnan District, Tianjin, China
Copyright @ 2025. Tianjin Jiangrui Steel Casting Co., Ltd.
Technical Support: Magic Lamp - Website
