Specialized standards for specialized supply: Strict standards separation ensures dimensional compatibility, eliminating misalignment risks.
Precision-Matched Flanges:Flanges customized from pipeline measurements for leak-free sealing.Thickness reinforced per standards (e.g., HG/T).
Traceable Craftsmanship: ISO9001 casting with permanent markings enables lifetime quality tracking.
Full-process Reliability: Reinforced components exceed standard product performance in strength/sealing/operation.
Guaranteed Material Integrity: We guarantee an optimized composition for our Carbon Steel, eg. ASTM A216 WCB, maximizing key elements like Manganese for strength while strictly minimizing impurities like Phosphorus and Sulfur, with a full MTC for traceability.
Design and Manufacture: ASME B16.34; ASME VIII; API 609; EN; BS; DIN; GOST; GB; JIS
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 |
Double Flange / U-Type Flange |
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Actuation |
Worm Gear / Bare Shaft (for automation) |
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Size Range |
2in ~ 80in (DN50 ~ DN2000) |
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Nominal Pressure |
PN10, PN16, PN25 / ANSI Class 125, Class 150 / JIS 10K, 16K |
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Testing Standard |
Shell: 1.5 x Rated Pressure Seat: 1.1 x Rated Pressure (acc. to API 598 / EN 12266-1) |
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Applicable Medium |
Potable Water, Wastewater, Seawater, HVAC Fluids, Compressed Air, and Mild Oils |
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Working Temperature |
-20°C to +150°C (-4°F to +302°F) *Dependent on seat elastomer selection |
Material of the Valve |
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|---|---|
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Body |
Ductile Iron: GGG40, GGG50, EN-GJS-400-15, EN-GJS-500-7, ASTM A536 65-45-12 Cast Iron (Optional): GG25, EN-GJL-250 |
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Disc |
Ductile Iron: Nickel Plated / Nylon Coated Stainless Steel: CF8 (304), CF8M (316), Duplex 2205 Aluminum Bronze: C95400, C95800 (For Seawater) |
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Stem / Shaft |
Stainless Steel: SS410, SS416, SS420 (Standard) High-Grade SS: SS304, SS316, 17-4PH, Duplex 2205 |
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Seat (Liner) |
Water/General: EPDM, WRAS/ACS Approved EPDM Oil/Air: NBR (Buna-N) High Temp/Chem: PTFE, FKM (VITON™) |
| Coating | • Type: Fusion Bonded Epoxy (FBE) Power Coating • Coverage: Internal & External • Standard Thickness: Min. 250 µm (AKZO Nobel / Jotun available) |
Reliable flanged butterfly valves start with sound castings. This video documents part of JRVAL's casting production process, from shell preparation and metal pouring to the finished as-cast components. For flanged butterfly valve projects, cast bodies can undergo third-party MT inspection after machining as specified in the agreed inspection plan.
For projects requiring independent quality verification, JRVAL can arrange third-party non-destructive testing (NDT) for flanged butterfly valve components, in accordance with applicable standards, agreed inspection scopes and customer requirements.
Used to detect surface and near-surface discontinuities in suitable ferromagnetic valve body and disc materials.
Used to reveal surface-breaking discontinuities on suitable non-porous metallic components.
Used to examine internal casting discontinuities in valve bodies and other cast components, where applicable.
Used to examine internal discontinuities in suitable components, subject to material properties and geometry.
The applicable testing method, inspection extent and acceptance criteria are determined by the component material, casting geometry, applicable specifications and project requirements.
Discuss Inspection RequirementsIn 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.
Our commitment to quality is verified by internationally recognized standards, providing the documentation and peace of mind you need for critical applications.
Designed for heavy-duty industrial applications, offering reliable bi-directional sealing and extended service life.
The upper shaft features a retained groove design to prevent stem blowout under pressurized conditions, ensuring operational safety.
Precision-machined disc edge and optimized seat interference provide bubble-tight shutoff in both flow directions at full rated pressure.
Self-lubricating bronze or PTFE-lined bearings reduce stem friction, allowing for lower torque requirements and smaller gear operators.
Seats are available in internally vulcanized forms for vacuum applications or replaceable cartridges for easy field maintenance.
The ductile iron disc is engineered with a hydrodynamic profile to minimize pressure drop and maximize flow capacity (CV).
Minimum 250µm Fusion Bonded Epoxy (FBE) powder coating on both inside and outside surfaces protects against severe corrosion.
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Address: DaZhan Industrial Park, Xiaozhan Town, Jinnan District, Tianjin, China
