High-Strength WCB Casting: Produced in our 20-year foundry, the ASTM A216 Carbon Steel body offers superior tensile strength and ductility compared to brittle cast iron, verified by internal PMI testing for high-stress pipelines.
Maintenance-Free Sealing: Engineered for bi-directional ISO 5208 Rate A (Bubble-Tight) shutoff, featuring a standardized mounting pad for easy actuator integration and backed by a 24-month replacement warranty.
Design Standards: API 609, EN 593, GB/T 12238, JIS B2032 & more. Other standards available on request.
Leakage Class: API 598 (Bi-directional Zero Leakage)
Side Flange Standards: ASME B16.5, EN 1092-1, JIS B2220 & more
Top Flange (Actuator Mounting) : ISO 5211; GB 90°
Face-to-Face Dimension Standards: API 609, EN 558, ISO 5752, ASME B16.10, MSS SP-67/68, GB/T 12221
Testing & Inspection Standards: API 609, EN 558, ISO 5752 & more
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 |
Semi-Lug (Threaded Bolt Holes: Metric/UNC) |
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Actuation |
Bare Stem: Extended Stem Design per ISO 5211 Manual: Hand Lever, Worm Gearbox Automated: Pneumatic Actuator (Double Acting/Spring Return), Electric Actuator |
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Size |
NPS 1 ½" ~ 48" (DN40 ~ DN1200) |
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Pressure |
PN10 ~ PN25 / ANSI Class 150 |
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Testing Pressure |
Shell: 1.5 x Rated Pressure; Seat: 1.1 x Rated Pressure (acc. to API 598) |
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Medium |
Fresh Water, HVAC Water, Oils, Gas Suitable for insulated pipelines and industrial heating |
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Medium Temperature |
-29℃~150℃ (-20°F to +300°F) Depends on seat material |
Material of the Valve |
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|---|---|
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Body |
Carbon Steel (ASTM A216 WCB) Low-Temp Carbon Steel (ASTM A352 LCB) |
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Disc |
Stainless Steel: CF8 (304), CF8M (316), CF3M (316L) Carbon Steel: WCB + ENP (Electroless Nickel Plating) |
| Shaft |
High-Strength Stem (Recommended): SS410, SS420, SS431, SS316 Standard: SS416 |
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Soft Seat |
Elastomers: EPDM (For Hot Water), NBR (For Oils), FKM (VITON™) High Temp: PTFE, PFA |
Engineered for industrial durability, our Carbon Steel Semi-Lug Butterfly Valve features an extended stem design ideal for insulated pipelines. Its high structural strength and thermal adaptability make it the definitive choice for HVAC, oil & gas, and power generation systems where cast iron falls short.
In large-scale heating and cooling networks, pipelines require thick insulation to prevent energy loss. The purpose-built Extended Stem Butterfly Valve allows the handle or actuator to remain accessible outside the lagging. This design ensures easy operation and maintenance without damaging the thermal insulation layer, critical for energy-efficient district energy loops.
Midstream oil transport requires valves that withstand higher pressures and mechanical shock than standard cast iron can handle. Constructed from robust Carbon Steel (WCB), our Extended Stem Butterfly Valve offers superior tensile strength and compatibility with fuel oils and crude, ensuring safe, leak-free performance in demanding industrial hydrocarbon environments.
For cooling water systems and low-pressure steam lines in power plants, equipment often faces significant temperature fluctuations. The Extended Stem Butterfly Valve design effectively isolates the actuator gear or pneumatic head from the pipeline's heat, protecting automation components from thermal damage while the carbon steel body maintains structural integrity under pressure.
In non-corrosive chemical processing and industrial water treatment, facility managers demand reliability and ease of installation. The semi-lug configuration allows for easier alignment during installation, while the Extended Stem Butterfly Valve provides necessary clearance for lagging or surrounding equipment, making it a versatile solution for complex industrial piping layouts.
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 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 etc. 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.
Region: South America (Logistics Hub) | Application: Chilled Water Distribution Network
Client Profile: "Andes Industrial Solutions" (Alias) – A mid-sized MEP contractor serving logistics warehouses.
The Challenge: The client was retrofitting a cooling network in a humid coastal warehouse. The original specification called for expensive European valves, which threatened the project's profitability. Technically, they faced two issues: 1) The need for heavy anti-sweat insulation (50mm) meant standard valve handles would be buried. 2) They needed material better than Cast Iron to resist coastal corrosion, but couldn't afford Tier-1 Carbon Steel prices.
The client needed the durability of Carbon Steel (WCB) without the "Brand Premium."
The JRVAL Approach: Leveraging our 20 years of casting expertise and an 81,426㎡ production facility, we produced the WCB bodies in-house. By bypassing intermediate suppliers and unnecessary branding markups, we delivered valves meeting the ASTM A216 WCB material standard at a 30% lower cost than the originally specified brand. This allowed the client to upgrade from Cast Iron to Carbon Steel while staying under budget.
A standard valve neck is too short for chilled water pipes wrapped in thick insulation.
We configured the valves with a 100mm Extended Stem. This simple but crucial modification allowed the client to apply the full 50mm insulation thickness around the valve neck without obstructing the actuator. It ensured the vapor barrier remained intact—preventing condensation and pipe corrosion—while keeping the operation gear accessible.
We utilized standard ISO mounting pads. This allowed the client to easily mount their preferred local brand of pneumatic actuators later, providing the integration flexibility they needed.
We focus on what actually matters for the installation:
We understand that for an SME contractor, long-term liability is a concern. We provided:
Ready to configure for your project?
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While Cast Iron is cheaper, it is brittle and prone to cracking under thermal shock or pressure hammers. Our ASTM A216 WCB Carbon Steel bodies offer significantly higher tensile strength and ductility. This makes them the safer, longer-lasting choice for industrial loops and HVAC systems where reliability is paramount.
Standard valves get buried when pipes are wrapped in thermal insulation. Our 100mm Extended Stem lifts the handle/actuator clear of the cladding (up to 50mm+ thick). This ensures the vapor barrier remains intact—preventing condensation and pipe corrosion—while keeping the gear operator fully accessible for your maintenance team.
To help you optimize project costs, we do not bundle expensive certification fees into our base price. We provide comprehensive Internal QC Reports (Chemical Composition & Dimensional Checks) free of charge, which satisfy most commercial applications. If your project strictly requires an EN 10204 3.1 Certificate, we can provide it as an optional add-on upon request.
We stand behind our quality with a 24-Month Warranty. Additionally, because our valves adhere to international ISO/API dimensional standards, you are never "locked in." Seals and bearings are standard sizes, meaning spare parts can be easily sourced from us or any local supplier even years after the warranty expires.
With 20 years of casting experience and an 81,426㎡ facility, we produce our own castings rather than outsourcing them. This gives us total control over the material integrity from the furnace to the final assembly. We use 11 CNC machining centers and calibrated go/no-go gauges to ensure every valve meets strict dimensional tolerances.
Yes. Our Semi-Lug design is engineered for reliable dead-end service. It allows your maintenance team to remove downstream piping (e.g., to service a pump) while the valve remains securely bolted to the upstream flange, holding back full system pressure. This significantly reduces system downtime during maintenance cycles.
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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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