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 & Manufacturing Standards: API 609, ASME B16.34, ASME Section VIII
Leakage Class: API 598 (Bi-directional Zero Leakage)
Side Flange Standards: ASME / ANSI: Class 125LB & 150LB; EN / DIN: PN6, PN10, PN16; BS / AS: BS 10 Table D/E, AS 2129 Table D/E; JIS: 5K, 10K (JIS B2220); GB / HG/T / GOST
Top Flange (Actuator Mounting) : ISO 5211; GB 90°
Face-to-Face Dimension: API 609, ISO 5752, EN 558-1, ASME B16.10, MSS SP-68
Testing & Inspection Standards: API 598, EN 12266-1, ISO 5208, BS 6755-1
Certifications & Conformity: ISO 9001:2015; CE Marking (PED); SIL 3; EAC; BV
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 |
Lever |
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Size |
NPS 1 ½" ~ 8" (DN40 ~ DN200) |
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Pressure |
6bar~20bar (0.6mpa~2.0mpa) |
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Testing Pressure |
1.5 x Rated Pressure |
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Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
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Medium Temperature |
-25℃~180℃ (Depends on seat material) |
Material of the Valve |
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|---|---|
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Body |
Stainless Steel: CF8 (304), CF8M (316), CF3 (304L), CF3M (316L), JS1030, 1.4406 Duplex Stainless Steel: 2205, 2507 Austenitic Stainless Steel: 1.4529, CN7M (Alloy 20) |
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Disc |
Cast Iron: DI, CI Stainless Steel: CF8 (304), CF8M (316), CF3 (304L), CF3M (316L), CD3MN (Duplex 2205), CE3MN (Super Duplex 2507), 1.4529 (926) Aluminum Bronze: C95400, C95800 Nickel Alloy: CW6MC (Hastelloy C-276 eq.) |
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Stem |
Carbon Steel: 45# Stainless Steel: SS410, SS416, SS420; SS304, SS316, SS304L, SS316L; 17-4PH (SS630); Duplex 2205, Super Duplex 2507, 1.4529 Nickel Alloy: Monel K500, Hastelloy C-276 |
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Soft Seat |
Elastomers: EPDM, HTEPDM, NBR (Nitrile Rubber / Buna-N), SIL (VMQ), FKM (VITON™), HYPALON™ Plastics: PTFE, PFA |
This video follows a batch of lug butterfly valve castings made using the silica sol investment casting process, from shell preparation and metal pouring to the as-cast valve bodies. The batch is scheduled for third-party MT inspection after machining.
For projects requiring independent verification, JRVAL can arrange third-party non-destructive testing (NDT) according to the agreed inspection scope, applicable standards and customer requirements.
Used to examine surface and near-surface discontinuities in suitable ferromagnetic materials.
Used to reveal surface-breaking discontinuities on suitable non-porous materials.
Radiographic examination for internal casting discontinuities, where applicable.
Ultrasonic examination for internal discontinuities, subject to material and casting geometry.
The suitable testing method, inspection extent and acceptance criteria depend on the material, casting geometry, applicable specifications and project requirements.
Discuss Inspection RequirementsEvery single component is precision-engineered and strictly quality-controlled to guarantee reliable, leak-free performance up to PN20.
CF8 Stainless Steel (Ni>9%), ISO 5211 top flange, pinless design. Threaded holes tapped precisely 3 times (error ±0.10mm).
Premium Teflon (PTFE) seat delivering superior chemical resistance and bi-directional zero leakage sealing.
Thickened robust disc design (20kg / PN20 rated), providing exceptional strength to withstand high-pressure applications.
High-strength 431 stainless steel shaft ensuring optimal torque transmission and operational stability.
High-molecular polymer sleeves significantly reduce friction, minimizing operating torque and extending service life.
C-shaped insert plate matched with a retaining spring on the shaft for reliable blowout-proof positioning.
In high-performance butterfly valves, critical features — including shaft bores, disc-to-shaft interfaces and mounting faces — must meet specified tolerances for accurate fit and assembly.
From defence and naval equipment to aerospace and precision industrial systems, applications with tight dimensional tolerances call for accurately machined, repeatable components.
A recent conversation with an agricultural irrigation buyer reminded us that when valves fail, the real cost goes far beyond the purchase price. Replacement, labor, project delays, and accountability all matter.
Verified material grades and traceable EN 10204 Type 3.1 inspection certificates.
Actual pressure and leakage tests with defined procedures and documented results.
Critical dimensions, assembly accuracy and operating performance checked before delivery.
Clear warranty terms, documented product records and accountable technical support.
Quality Should Be Demonstrated, Not Just Promised.
Before machining even begins, we solve the biggest challenge of large steel castings: rough surfaces caused by rapid cooling. By preheating shell molds up to 800°C, we guarantee superior blank quality.
Watch how we combine advanced casting techniques with 0.1mm CNC precision to manufacture industrial valves capable of withstanding the toughest conditions.
Our commitment to quality is verified by internationally recognized standards. We provide the corresponding documentation to prove it.
For over 20 years, JRVAL's reputation has been built on deep material expertise and precision engineering. We control the entire process from raw material casting to final assembly, ensuring every valve meets our exacting standards.
Founded by casting experts, we guarantee material integrity from the source. Through PMI spectral testing, we verify alloy compositions, ensuring every butterfly valve casting strictly adheres to ASTM/EN standards for optimal performance and longevity.
Our advanced CNC machining centers ensure that every component's dimensions are precisely to specification. This accuracy is critical for the perfect fit and flawless operation of butterfly valve components, guaranteeing product reliability.
With two decades of field validation, our valve designs are not just theoretical but proven to be sound and reliable. This extensive experience means our products deliver consistent, dependable performance under real-world conditions.
Below are representative application industries for this valve. As butterfly valves can be used in nearly all industrial sectors (provided temperature and pressure requirements are met), many industries are not listed individually.
Lug type butterfly valve uses API 609-certified PTFE/metal seals for zero leakage. The lugged flange maintains uniform sealing pressure, suitable for petrochemical pipelines.
The Lug valve's bolt shear strength is 400% higher than wafer valves, withstanding 20bar water hammer, ideal for turbine bypass systems.
Handle butterfly valve achieves rapid opening/closing in ≤3s, reducing water hammer pressure, with a service life of 30 years (3-5x that of cast iron valves).
Marine butterfly valves with all-stainless steel construction eliminate galvanic corrosion, compatible with Cu-Ni/duplex steel marine piping.
Lug type valve's dead-leg-free design prevents wastewater crystallization. All-metal seals eliminate rubber aging contamination.
Sanitary butterfly valves withstand 150°C steam/acid-alkali cleaning agents, with food-grade EPDM/FKM seals tested for 100,000 cycles.
Reinforced lug butterfly valve with hardened STL alloy seat (HRC58+) withstands 30% solid abrasion and 20bar water hammer.
CF8M cryogenic butterfly valve prevents brittle fracture at -60°C. Metal seals ensure <0.01% leakage in refrigeration systems.
JRVAL's lug flange, with corrosion-resistant duplex steel (2205/2507/1.4529), offers 20% higher pressure capacity, excelling in desalination.
In the world of premium beverage production, purity isn't just a goal; it's the brand's entire promise. For a leading Vietnamese fruit juice producer, Thanh Long Beverages, every surface that touches the product must be engineered to be flawlessly clean, preventing any possibility of microbial contamination.
Guardians of Natural Flavor
Thanh Long Beverages prides itself on its state-of-the-art facility, producing 100% natural juices. "Our customers trust us for purity. A single point of contamination in our process lines can lead to biofilm growth, spoiling entire batches and damaging our brand reputation," explains Ms. Nguyen Thi Lan, the Head of Quality Engineering. "We need components that are not just corrosion-resistant, but microscopically cleanable."
During a facility upgrade, Ms. Lan's team needed hundreds of manual isolation valves. Their challenge was to find a valve that could withstand daily, aggressive Clean-in-Place (CIP) chemical cycles (acid and caustic washes) without seizing, and whose internal surfaces would not harbor bacteria.
When "Food-Grade" Isn't Enough: The Threat of Biofilm
The team had experienced issues with previous "food-grade" valves. "On the surface, they were 316 stainless steel," Ms. Lan notes. "But under a microscope, the standard machined finish had tiny grooves and imperfections where bacteria could hide. After months of CIP cycles, the lever mechanisms, often made of plated steel, would corrode and seize. We needed a supplier who understood hygienic design at a metallurgical level, not just on a spec sheet."
We recognized that Thanh Long's challenge required a deep understanding of material science and surface finishing. Our solution was a testament to our ISO 9001-certified process control: Our CF8M (316 SS) Lug Butterfly Valve, specifically engineered for hygienic applications.
Our process begins at the foundry. Every CF8M valve body undergoes a mandatory solution annealing heat treatment at 1060°C (1940°F), followed by a rapid water quench. Why is this essential for the food industry? This process dissolves carbides and creates a uniform austenitic microstructure, maximizing the material's resistance to corrosion from the aggressive acids and caustics used in CIP systems. This prevents the micro-pitting that can become a breeding ground for bacteria, ensuring the valve's integrity over thousands of cleaning cycles.
To eliminate the risk of biofilm, a standard finish is unacceptable. Every wetted part of our valve—the disc and the internal body—undergoes electropolishing. This is not a mechanical process; it's an electrochemical one that removes a microscopic layer of surface metal. The result: An ultra-smooth, mirror-like finish with a surface roughness (Ra) of less than 0.5 μm. This exceptionally smooth surface is highly passive and free of the microscopic crevices where bacteria can anchor, making the valve significantly easier to clean and sterilize, saving time and ensuring product safety.
To combat the corrosion of the lever mechanism, our design eliminates weak points. The lever, handle, and locking plate are all constructed from solid 304 Stainless Steel, not plated carbon steel. The stem rotates within PEEK (Polyether ether ketone) bushings. This advanced, food-grade polymer provides excellent chemical resistance and an extremely low coefficient of friction against the stainless steel stem. This all-stainless, self-lubricating design ensures smooth, reliable operation without galling or seizing, even after constant exposure to harsh wash-down environments.
The final barrier is the seal. We use an FDA-compliant EPDM seat, chosen for its excellent performance in food applications and its resistance to CIP chemicals. Each valve is marked with a unique heat number, providing full traceability back to the raw material melt, a core tenet of our ISO 9001 quality system. This guarantees that the materials are exactly what we claim they are, providing Thanh Long with the documentation and peace of mind they require.
For a brand like Thanh Long Beverages, whose reputation is built on purity, partnering with a manufacturer that controls every engineering detail is paramount. Our documented processes, governed by our ISO 9001 quality management system, provide the transparency and reliability they need. Per Ms. Lan: "Knowing our supplier has this level of control over heat treatment and surface finishing gives us confidence in the safety and quality of our own product. They are protecting our process, which in turn protects our brand."
We believe that true quality comes from a deep understanding of engineering principles. By focusing on the science behind our components, we provide the unshakeable foundation for industries where purity and reliability are not just requirements, but the very definition of success.
Ready to configure for your project?
Absolutely. We custom-machine flanges for any standard—GB, ANSI, DIN, BS, JIS, etc. Every connection is verified with Go/No-Go gauges to guarantee a perfect, trouble-free fit.
Yes. Our lug-type butterfly valve features an award-winning, compact design. It's engineered specifically for space-constrained environments without compromising strength or performance.
Our standard is metric for seamless installation with common metric bolts. We can also accommodate any special threading requests you may have.
We combine premium sealing materials rated for your exact service with precision-machined valve bodies and seats. This dual approach eliminates both internal and external leakage paths.
Yes. In addition to standard markings (Model, Material, Heat No.), we can laser-engrave custom asset IDs, pipeline codes, QR codes, or any other data required for your asset management system.
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Address: DaZhan Industrial Park, Xiaozhan Town, Jinnan District, Tianjin, China
