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/ 10/ 16/ 25; 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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|---|---|
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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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|---|---|
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Body |
CF8/ CF8M/ CF3/ CF3M/ 2205/ 2507/ 1.4529/ 1.4406 |
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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 |
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.
Learn More About Our ProcessFor 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 for seamless integration and automation.
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 in automated systems.
Our advanced CNC centers machine critical interfaces, like the ISO 5211 mounting pad, to exacting tolerances. This precision guarantees effortless, accurate alignment with any standard electric or pneumatic actuator, ensuring reliable automated control.
With two decades of field validation in automated applications, our valve designs are proven to be sound and reliable. This experience means our products deliver consistent, dependable performance when integrated into complex control systems.
Our bare stem butterfly valves are engineered for seamless integration into automated systems across countless industries. The standardized top flange allows for easy mounting of electric, pneumatic, or hydraulic actuators to meet specific process control requirements.
In hazardous environments, our bare stem valves allow for direct mounting of explosion-proof actuators. A high-performance butterfly valve ss body ensures long-term resistance to corrosive hydrocarbons and process chemicals, vital for automated safety and control loops.
For high-pressure cooling water or steam lines requiring automated control, our valves provide a robust platform for high-torque actuators. The full butterfly lug design allows for dead-end service, enabling safe actuator maintenance without shutting down the entire line.
Large-scale water treatment and distribution networks rely on automated flow control. Our bare stem valves, ready for SCADA system integration via actuators, are designed to meet or exceed the rigorous standards of an AWWA butterfly valve for long-term public utility service.
Automated ballast, bilge, and cooling systems on vessels require reliable, space-saving components. Our bare stem class 150 butterfly valve, available in corrosion-resistant alloys, integrates perfectly with marine-grade actuators for dependable operation at sea.
Wastewater treatment plants use automated valves to control flow in aeration basins and chemical dosing systems. The bare stem design of our rubber lined butterfly valve ensures tight shut-off and is ready to connect to the plant's central PLC for precise process control.
Automated Clean-In-Place (CIP) and production systems require valves that integrate with process controls. Our bare stem butterfly valve EPDM seat option is FDA-compliant, providing a hygienic and reliable solution for actuated flow control in food and beverage lines.
The harsh conditions of steel and aluminum mills demand robust automation. Our bare stem center line butterfly valve provides a reliable foundation for heavy-duty actuators used to control cooling water circuits and processing fluid lines under extreme temperatures and pressures.
Large industrial refrigeration systems (e.g., ammonia or CO2) rely on precise, automated flow control. Our bare stem low temperature butterfly valve is built from cryogenic-rated materials, ready for actuator integration to ensure system efficiency and safety.
Desalination plants feature vast networks of automated valves. Our duplex steel valves offer superior corrosion resistance, making us a preferred partner for large-scale projects that require a dependable wholesale lug butterfly valve supplier for their automated systems.
In a reverse osmosis desalination plant, every component is in a relentless battle against chloride-induced corrosion. For AquaSoluciones Ibéricas, a premier Spanish designer of modular RO skids, the long-term integrity of the materials they choose is the difference between a successful project and a critical failure.
Engineering Purity from the Sea
AquaSoluciones Ibéricas builds high-efficiency desalination systems destined for coastal communities and industrial sites worldwide. "Our systems must operate for decades in a hyper-corrosive brine environment. We are not just assembling parts; we are engineering a long-term solution," says Javier Morales, their Chief Mechanical Engineer. "The bare-stem butterfly valves we integrate are a foundational component. Their material integrity is non-negotiable."
For their new generation of RO skids, Javier's team needed a supplier of CF8M (316 SS) lug valves who could provide not just a component, but verifiable proof of superior metallurgical and mechanical engineering.
The Hidden Failures of "Standard" Stainless Steel
The team had been let down before. "We saw valves failing from crevice corrosion in the lug-bolt threads and under the valve seat after only a few years," Javier recalls. "The issue was sensitization of the steel—improper heat treatment was making it vulnerable to intergranular attack from chlorides. On the mechanical side, inconsistent stem dimensions meant our actuators either fit poorly or required on-site rework, a costly delay for an OEM."
We understood that for a high-stakes application like desalination, "standard" is never good enough. Our ISO 9001-certified quality system governs a process designed for exactly these challenges. Our solution was our **CF8M (316 Stainless Steel) Bare-Stem Lug Butterfly Valve, engineered for maximum corrosion resistance and flawless OEM integration.**
Our process begins with a casting philosophy rooted in material science. We employ a high-density casting method for our CF8M bodies. This ensures a homogenous, non-porous microstructure, completely free of the micro-voids and inclusions that can become initiation sites for pitting corrosion in high-chloride environments. This solid, flawless foundation is the first and most critical step in ensuring long-term material integrity.
To combat the threat of intergranular corrosion, every CF8M casting undergoes a precise **solution annealing heat treatment**. The valve body is heated to **1060°C (1940°F)** to dissolve any chromium carbides that may have formed in the grain boundaries, and then subjected to a **rapid water quench**. **Why is this process so vital?** The rapid cooling "freezes" the uniform austenitic structure in place, preventing carbide precipitation. This immunizes the steel against sensitization, ensuring it maintains its full corrosion resistance, especially in the challenging brine concentrates of an RO system.
We machine for perfect integration. The lug threads are not just tapped; they are meticulously checked. Each threaded hole is verified with **calibrated go/no-go gauges**, guaranteeing that bolts will engage smoothly and torque down correctly, preventing installation headaches. The actuator interface—the bare stem head—is CNC-machined to **ISO 5211 standards with a ±0.1mm tolerance**. This guarantees a precise, no-slop fit for AquaSoluciones' standardized actuators, ensuring accurate control and zero mechanical play.
A reliable seal depends on more than just the disc and seat. It depends on how the operator's torque is transferred. Our design utilizes a **double-D stem profile** that fits into a correspondingly broached slot in the disc. Both components are machined as a matched set. This provides a large, robust contact area, eliminating the torsional stress and potential failure points of a simple pinned connection. This ensures the disc closes evenly and concentrically every single time, delivering the promised bi-directional, zero-leakage performance for the life of the valve.
For innovators like AquaSoluciones Ibéricas, the ability to deliver clean water to the world depends on the absolute reliability of their foundational components. They required a partner whose manufacturing discipline, documented through our ISO 9001 quality system, could be trusted implicitly. As Javier Morales states, their confidence comes from our control over the details that truly matter.
By focusing on the fundamental science of materials and the precision of our machining, we provide the engineered certainty that allows our OEM partners to build complex, life-sustaining systems with confidence. We are proud that our engineering is the unseen foundation for a more sustainable world.
Our commitment to quality is verified by internationally recognized standards. We provide the corresponding documentation to prove it.
Ready to configure for your project?
Our bare stem valves feature a top mounting flange manufactured in strict accordance with the ISO 5211 international standard. This guarantees seamless compatibility with any ISO 5211 compliant electric, pneumatic, or hydraulic actuator. We provide detailed dimensional drawings to verify the fit before you order.
We offer various stem head options, including standard square and double-D configurations, to match common actuator outputs. The stem is precision-machined from high-strength stainless steel (e.g., SS420, 17-4PH) and its diameter is engineered to exceed the torque requirements of the valve's pressure class, ensuring reliable operation with powerful actuators.
Flexibility is the key advantage. Buying a bare stem valve allows you to: 1) Standardize on your preferred actuator brand. 2) Select specialized actuators (e.g., explosion-proof, fast-acting) for specific applications. 3) Achieve cost savings on large automation projects by sourcing components separately.
Yes, our standard lug threads are metric (M-series), and we can produce UNC threads on request. Critically, every tapped lug hole undergoes a 100% go/no-go gauge inspection. This guarantees precise thread depth and form, preventing installation failures and ensuring a secure, leak-free flange connection.
Absolutely. We understand that precise dimensions are critical for system integration. We provide comprehensive technical datasheets and can supply 2D/3D CAD models (e.g., .STEP, .DWG) for our bare stem valves upon request. This allows your engineering team to accurately model piping layouts and actuator clearance.
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 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 of its products have been verified by the market for 20 years.
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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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