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 |
Round/Square Head |
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Size |
1 1/2in ~ 48in (DN40~DN1200) |
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Pressure |
10bar~20bar (1.0mpa~2.0mpa) |
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Testing Pressure |
256psi |
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Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
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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 |
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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 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 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.
Our bare stem lug butterfly valves are the ideal foundation for automated flow control. The ISO 5211 top flange provides universal compatibility with electric and pneumatic actuators, making them a versatile choice for diverse industries.
Engineered for automated systems in hazardous environments, our valves feature an anti-static design and reliable sealing. The bare stem configuration allows for easy integration with explosion-proof actuators, making it a safe choice for a teflon lined butterfly valve in volatile media control.
In power plants, reliability is non-negotiable. Our fully lugged butterfly valve design ensures a secure, vibration-resistant installation in cooling water and auxiliary systems, ready to be paired with heavy-duty actuators for consistent, long-term performance.
Ideal for large-scale waterworks automation, these valves offer dependable service. The bare stem design seamlessly connects to SCADA-controlled actuators, while the robust epdm seat butterfly valve provides bubble-tight shutoff, meeting stringent public utility standards.
Space and reliability are critical at sea. The compact, bare stem design allows for flexible actuator mounting in cramped engine rooms and ballast systems. A durable, cost-effective carbon steel butterfly valve body with marine-grade coating ensures longevity against saltwater corrosion.
In automated waste treatment facilities, our valves are a core component. The bare stem allows for integration into process control loops, while the durable construction of the rubber lined butterfly valve handles abrasive and corrosive effluents with exceptional reliability.
For automated clean-in-place (CIP) and utility lines, our valves provide a reliable base. The universal top flange fits sanitary actuators, and when specified with FDA-compliant seats, the ptfe lined butterfly valve ensures product purity and process integrity.
Designed to withstand the toughest conditions, these valves are ready for the high-torque pneumatic actuators used in slurry transport. A properly specified lined butterfly valve with a hardened disc provides superior abrasion resistance, ensuring operational uptime in mineral processing.
The bare stem design is perfect for cryogenic applications, allowing for the addition of an extended bonnet to insulate the actuator from extreme cold. This ensures reliable automation for cryogenic butterfly valves in LNG processing and industrial gas systems.
Our valves are a foundational component for large, automated desalination plants. The universal mounting pad facilitates integration with centralized control systems, while specialized epoxy coated butterfly valves provide essential protection against high-salinity environments.
A modern cargo ship is a self-contained industrial city, where thousands of components must operate flawlessly in one of the world's harshest environments. For Marmara Tersanesi, a leading Turkish shipyard, the reliability of foundational components like valves is not a line item—it's the bedrock of their global reputation.
Building for a Lifetime at Sea
Marmara Tersanesi doesn't just assemble ships; they engineer complex maritime assets designed for a 30-year lifecycle. "Our automation strategy involves standardizing our pneumatic and electric actuators across the entire vessel," explains İsmail Demir, the head of the Mechanical Integration department. "This means we need bare-stem valves that are dimensionally perfect, every single time. A single millimeter of deviation in the stem drive can halt the outfitting of an entire piping system."
For the critical ballast and cooling water systems of their new vessel series, İsmail needed a valve supplier who understood that for an OEM, a valve is a precision mechanical interface, not just a piece of hardware.
The Integration Nightmare: Inconsistent Fits and Premature Failure
İsmail's team was plagued by issues from their previous valve suppliers. "It was a constant struggle," he recalls. "The square drive on the valve stems varied from batch to batch, leading to a sloppy fit with our actuators. This caused backlash and, in some cases, sheared the stem connection under high torque. Furthermore, the standard paint would begin to fail from the salt spray even before the ship's sea trials, a huge quality issue for us."
We recognized that Marmara Tersanesi's challenge was a classic case of needing true industrial-grade engineering in a supposedly "standard" component. Our solution was a demonstration of our ISO 9001-certified manufacturing discipline: Our A216 WCB Carbon Steel Bare-Stem Lug Butterfly Valve, engineered for seamless OEM integration.
A ship's engine room is an environment of constant vibration. To create a tough, resilient foundation, every single A216 WCB valve body undergoes a **normalizing heat treatment**. It is heated to **910°C (1670°F)** and held, then air-cooled. **Why is this non-negotiable for marine applications?** This process refines the coarse, as-cast dendritic structure into a uniform, fine-grained ferrite-pearlite matrix. This dramatically increases the valve's fatigue resistance and impact toughness, ensuring it can withstand decades of mechanical stress without risk of brittle fracture.
We solve the actuator mounting problem with absolute precision. The valve stem head is not an afterthought; it is a critical interface. It is CNC-machined to strictly comply with **ISO 5211 standards**, with the square drive held to a tight **dimensional tolerance of ±0.1mm**. This guarantees a perfect, zero-backlash fit with Marmara's standardized actuators, ensuring reliable torque transmission and eliminating the primary failure point İsmail's team had experienced.
To combat the aggressive marine environment, a standard industrial coating is insufficient. Our valves are protected by a **three-coat system engineered for a C4 (High Salinity) environment**. The process begins with shot-blasting to Sa 2.5, followed by a **zinc-rich epoxy primer** for galvanic protection. This is sealed with a high-build **epoxy mid-coat** for barrier protection, and finished with a **polyurethane topcoat** for UV resistance and a durable finish. This system prevents the premature corrosion and guarantees the valve's external integrity for years.
Ballast systems require a valve that seals perfectly from either direction. Our design achieves this through the geometric relationship between the disc and seat. The disc edge is machined to a precise spherical profile, which engages with a molded EPDM seat. This creates a **360-degree interference fit** that is energized by line pressure. The higher the pressure, the tighter the seal, ensuring bubble-tight shutoff whether filling or emptying the ballast tanks—a core requirement for vessel stability and safety.
For a shipbuilder like Marmara Tersanesi, the final product's quality is a direct result of the quality of its foundational components. They found a partner whose manufacturing processes, documented under our ISO 9001 system, provide the consistency and reliability required for such a demanding industry. Per İsmail Demir: "Working with a manufacturer that controls its metallurgy and machining to this degree allows our team to focus on the complex task of vessel integration, confident that the core components will perform flawlessly."
We are proud to be the unseen but essential engineering partner for industries that form the backbone of the global economy. By obsessing over the details of our components, we provide the certainty that allows our partners to build with confidence.
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?
Our valves feature a universal top flange fully compliant with the ISO 5211 standard. This ensures seamless compatibility with a wide range of standard electric and pneumatic actuators from any manufacturer, simplifying your automation integration.
We provide a detailed torque chart for each valve size, showing the required torque at various differential pressures. We recommend selecting an actuator with a torque output at least 30% higher than the valve's published requirement to ensure reliable performance.
Absolutely. While our standard is a carbon steel body with EPDM seat and a nylon-coated disc, we offer a full range of material options. This includes Stainless Steel or Duplex discs and NBR, Viton®, or PTFE seats to handle corrosive or high-temperature media.
Yes, our lug-type butterfly valves are engineered for reliable dead-end service up to the full pressure rating (e.g., PN16 or Class 150). The full-circle threaded lugs allow the valve to be securely bolted to one flange, enabling downstream pipe removal for maintenance.
Our standard finish is a high-build fusion bonded epoxy (FBE) coating, applied to a minimum thickness of 250 microns (10 mils). This provides excellent resistance to corrosion, abrasion, and chemicals for general industrial and water applications.
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.
Technical Support: Magic Lamp - Website
