Cartridge Seat Lugged Concentric Butterfly Valve
Description
Technical Data Sheet
Cartridge Seat Lugged Concentric Butterfly Valve
1. General Description
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Product Type: Concentric Butterfly Valve, Lugged Type
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Seat Design: Cartridge Seat (Replaceable, Metal-Reinforced Resilient Seat)
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Operation: Lever, Gearbox, Pneumatic Actuator, or Electric Actuator (ISO 5211 mounting pad)
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Design Standard: EN 593 / API 609 / ISO 10631 / MSS SP-67
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Face-to-Face: EN 558 Series 20 / API 609 Table 1
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Flange Drilling: EN 1092-2 PN10/16, ASME B16.5 Class 150, JIS B2220
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Test Standard: EN 12266-1 / API 598 / ISO 5208
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Temperature Range: -40°C to +180°C (depending on seat material and pressure)
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Pressure Rating: PN10/16, Class 150
2. Application
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Suitable Media: Water, air, oils, gases, weak corrosive liquids, vacuum services
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Typical Industries: Water treatment, HVAC, chemical processing, marine, food and beverage, pulp and paper
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Dead-End Service: Lugged design allows for full rated unidirectional dead-end service (line end isolation)
3. Technical Parameters (Typical Range)
| Parameter | Specification |
|---|---|
| Nominal Diameter (DN) | DN50 – DN600 (larger sizes available up to DN2000) |
| Pressure Rating | PN10 / PN16 / Class 150 |
| Shell Test Pressure | 1.5 x PN (e.g., 24 bar for PN16) |
| Seat Test Pressure | 1.1 x PN (e.g., 17.6 bar for PN16) |
| Leakage Rate | Zero Leakage (Bubble Tight) – ISO 5208 Rate A / ANSI Class VI |
| Operating Temperature | -40°C to +180°C (dependent on seat elastomer) |
| Vacuum Service | Suitable for full industrial vacuum |
| Flow Characteristic | Approximately linear, low pressure drop |
| Direction of Flow | Bi-directional |
| Mounting Flange | ISO 5211 top flange for direct actuator mounting |
4. Materials of Construction
| Component | Material Options | Notes |
|---|---|---|
| Body | Ductile Iron (GGG40/GGG50) / Cast Iron / Carbon Steel (WCB) / Stainless Steel (CF8/CF8M) | Epoxy coated (min. 250µm) for corrosion protection |
| Disc | Stainless Steel (CF8/CF8M/316) / Ductile Iron with Nylon Coating / Bronze | Streamlined design for high Cv |
| Stem | Stainless Steel (416/304/316/420) / 17-4PH | One-piece thru-shaft design, anti-blowout |
| Seat (Cartridge Type) | Composite Construction: | Modular design with metal reinforcement ring |
| – Sealing Material: EPDM / NBR / Viton / PTFE | Encapsulated rubber or PTFE | |
| – Support Ring: Stainless Steel / Phenolic | Prevents extrusion and deformation | |
| Bushings / Bearings | PTFE / Bronze / Reinforced PTFE | Low friction, absorbs side thrust |
| Stem Seals | O-Rings (EPDM/NBR) + Dirt Wiper | Multiple sealing, prevents external contamination |
5. Cartridge Seat Features & Benefits
The Cartridge Seat design is a key feature of this valve, offering significant advantages over conventional lined or booted seats .
| Feature | Benefit |
|---|---|
| Modular / Pre-Assembled Design | Seat is a self-contained unit (sealing material bonded to a rigid metal/phenolic ring) . |
| Field Replaceable | Seat can be replaced without removing the valve body from the pipeline. Only the disc and stem need to be removed . |
| Metal-Reinforced Construction | Stainless steel or rigid backing ring prevents seat distortion, deformation, and blowout under high pressure, vacuum, or thermal cycling . |
| Consistent Low Torque | Seat dynamics are not dependent on flange compression. Provides uniform, low operating torque throughout valve life . |
| Extrusion Resistance | Rigid support ring eliminates seat extrusion into the flow path, extending service life (up to 10x longer than standard seats) . |
| Isolation of Body/Stem | The cartridge seat completely isolates the valve body and stem from the line media, preventing corrosion of metal parts . |
6. Sealing Mechanism
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Primary Seal: Formed by preloaded contact between the precision-machined disc hub and the flatted sealing surfaces of the cartridge seat .
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Secondary Seal: Achieved by an engineered interference fit of the stem through the seat, providing additional sealing integrity around the shaft .
7. Dimensions & Weights (Reference Values – Lugged Type, PN16)
*Note: Dimensions vary by manufacturer. The following are based on industry standards (EN 558 Series 20) for reference. Request certified drawing for exact dimensions. *
| DN (mm) | L (Face-to-Face) mm | D (Flange Dia.) mm | H (approx. open) mm | Weight (approx.) kg |
|---|---|---|---|---|
| 50 | 43 | 165 | 150 | 2.8 |
| 65 | 46 | 185 | 165 | 3.7 |
| 80 | 46 | 200 | 180 | 5.1 |
| 100 | 52 | 220 | 210 | 6.9 |
| 125 | 56 | 250 | 235 | 9.3 |
| 150 | 56 | 285 | 260 | 10.5 |
| 200 | 60 | 340 | 310 | 17.4 |
| 250 | 68 | 405 | 360 | 28.1 |
| 300 | 78 | 460 | 420 | 40 |
| 350 | 78 | 520 | 470 | 55 |
| 400 | 102 | 580 | 520 | 85 |
| 450 | 114 | 640 | 570 | 114 |
| 500 | 127 | 715 | 620 | 144 |
| 600 | 154 | 840 | 740 | 227 |
(Data compiled from industry standard references )
8. Testing
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Shell Test: 1.5 x rated pressure – No visible leakage .
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Seat Test: 1.1 x rated pressure (bi-directional) – Bubble tight shut-off (Rate A) .
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Vacuum Test: Suitable for full vacuum service (e.g., 0.08 MPa) .
9. Options & Accessories
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Operation: Hand lever (with infinite positioning), Worm Gearbox (with handwheel), Pneumatic Actuator (double-acting or spring return), Electric Actuator .
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Position Indication: Mechanical visual indicator, limit switch boxes, positioners .
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Stem Extension: For buried or insulated lines .
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Anti-Static Device: Per ISO 5211 .
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Fire-Safe Design: Optionally available to API 607 .
10. Standards & Certifications
| Category | Standard |
|---|---|
| Valve Design | ISO 10631 / EN 593 / API 609 / MSS SP-67 |
| Face-to-Face | EN 558 / API 609 / ISO 5752 |
| Flange Connection | EN 1092-2, ASME B16.5, JIS B2220 |
| Top Flange | ISO 5211 |
| Testing | EN 12266-1, API 598, ISO 5208 |
| Potable Water | WRAS / KTW (for EPDM seats) |
| Fire Safety | API 607 (Optional) |
11. Ordering Information
To ensure correct selection, please specify:
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Valve Type: Lugged Concentric Butterfly Valve with Cartridge Seat
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Size (DN / Inch)
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Pressure Rating (PN / Class)
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Seat Material (EPDM, NBR, Viton, PTFE)
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Disc Material (SS304, SS316, etc.)
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Body Material (Ductile Iron, Carbon Steel, etc.)
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Operation Required (Lever, Gearbox, Actuator)
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Flange Standard (EN 1092-2, ASME B16.5, etc.)
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Any Special Requirements (Fire-safe, Anti-static, etc.)
This data sheet is a guideline based on standard industry practice for cartridge seat lugged butterfly valves . Always refer to the manufacturer’s certified drawings for exact dimensions and ratings.
