2″-150LB-Lugged Triple Offset Butterfly Valve
Description
2″ – 150LB Lugged Triple Offset Butterfly Valve
Technical Data Sheet
1. General Information
| Item | Description |
|---|---|
| Valve Type | Triple Offset Butterfly Valve |
| Nominal Size | 2 Inch (DN50) |
| Pressure Rating | Class 150 LB (PN20) |
| End Connection | Lug Type, conforming to ASME B16.5 |
| Application | Bi-directional tight shut-off, high cycle service, high temperature / high pressure / corrosive media |
2. Design & Manufacturing Standards
| Standard | Description |
|---|---|
| Design Code | API 609 (Category B – Triple Offset) |
| Face-to-Face Dimension | API 609 (Short or Long pattern, as required) |
| Flange Dimensions | ASME B16.5 Class 150 |
| Pressure-Temperature Rating | ASME B16.34 |
| Top Flange | ISO 5211 (for easy actuator / gear mounting) |
| Inspection & Testing | API 598 |
| Leakage Rate | API 598 Rate A / ISO 5208 Rate A (Zero leakage) |
3. Main Materials (Typical – can be customized)
| Component | Standard Material | Optional Materials |
|---|---|---|
| Body | Carbon Steel (WCB) | Stainless Steel CF8M, CF3M, Duplex SS |
| Disc | Stainless Steel CF8M | Duplex SS, Hastelloy |
| Stem | 17-4PH Precipitation Hardening SS | Inconel, Monel |
| Seat Sealing Surface | Stellite hardfacing | Nickel-based alloy |
| Seal Ring | Multi-layer metal + graphite | PTFE (for low temp / corrosive service) |
| Packing | Flexible graphite + SS spacer rings | PTFE + graphite |
| Fasteners | Stainless Steel A193 B8 | Alloy steel |
4. Outline Dimensions & Weight (Typical values – may vary by manufacturer)
| Dimension Parameter | Value (Reference) |
|---|---|
| Face-to-Face Length L | Approx. 44 – 51 mm (Short) / 57 mm (Long) |
| Center Height (Top to center) H | Approx. 105 mm |
| Overall Height (with gear operator) H1 | Approx. 310 mm |
| Bolt circle diameter (Lug) | 120.6 mm (ASME B16.5 Class 150) |
| Number / Diameter of Lug bolt holes | 4 × 19 mm |
| Weight (worm gear operated) | Approx. 7.5 kg |
| Weight (lever operated) | Approx. 4.5 kg |
⚠ Dimensions above are typical. Final dimensions to be confirmed with manufacturer’s drawing.
5. Pressure-Temperature Rating (ASME B16.34 – WCB body)
| Temperature (°C) | Max. Working Pressure (bar) |
|---|---|
| -29 ~ 38 | 19.6 |
| 100 | 17.6 |
| 150 | 15.3 |
| 200 | 13.2 |
| 250 | 11.2 |
| 300 | 9.2 |
| 350 | 7.5 |
| 400 | 5.5 |
| 425 | 4.4 |
For CF8M body, the ambient pressure rating is slightly higher (~19.8 bar) with better high-temperature performance. Refer to material pressure curves for details.
6. Performance Data
| Parameter | Value |
|---|---|
| Pressure Rating | Class 150 (1.9 MPa @ 38°C) |
| Seat Test Pressure (water) | 1.4 MPa (Low-pressure air test 0.6 MPa) |
| Shell Test Pressure | 2.9 MPa |
| Allowable Differential Pressure | Full rated pressure, bi-directional |
| Leakage Rate | Zero leakage (metal seated, API 598 Rate A) |
| Temperature Range | -29°C ~ +425°C (WCB + Stellite) |
| Suitable Media | Water, steam, oil, natural gas, mildly corrosive media |
| Max. Operating Torque (with gearbox) | Approx. 35 N·m (on-off service) |
7. Actuation Options
| Actuation Type | Remarks |
|---|---|
| Lever + limit stop | Not recommended for triple offset due to high torque |
| Worm gear operator | Standard configuration, with position indicator and mechanical stop |
| Electric actuator | On-off or modulating type, ISO 5211 mounting |
| Pneumatic actuator | Double-acting or spring-return, with solenoid valve and limit switches |
| Hydraulic actuator | For special or explosion-proof applications |
8. Key Features
-
Triple offset design – No friction during opening/closing, long service life
-
Lugged connection – Suitable for dead-end service, can maintain pipeline pressure without mating flange
-
Metal hard seal – High temperature resistance, wear and erosion resistant, ideal for steam and high-velocity media
-
Bidirectional zero leakage – Suitable for stringent shut-off requirements
-
Low operating torque – Lower than conventional hard-seal butterfly valves, allows smaller actuators
9. Ordering Information
Please provide the following when ordering:
-
Valve size, pressure rating
-
Body, disc, and seat materials
-
Actuation type (lever, worm gear, electric, pneumatic)
-
Media name, temperature, and pressure
-
Special requirements (fire-safe, anti-static, low emission packing, etc.)
