10″-150LB-Wafer High Performance Butterfly Valves
Description
10″ – 150LB – Wafer High Performance Butterfly Valve
Technical Data Sheet
1. General Information
| Item | Description |
|---|---|
| Valve Type | High Performance Butterfly Valve / Double Offset Butterfly Valve |
| Nominal Size | 10 Inch (DN250) |
| Pressure Rating | Class 150 LB (PN20) |
| End Connection | Wafer Type |
| Application | Suitable for chemical, petrochemical, power, HVAC, and other services; can be used for on-off or throttling control |
2. Design & Manufacturing Standards
| Standard | Description |
|---|---|
| Design Code | API 609 Category B (Double Offset Design) |
| Body Construction | Double Offset / Double Eccentric |
| Face-to-Face Dimension | API 609 Category B / ISO 5752 / EN 558-1 |
| Flange Connection Dimensions | ASME B16.5 Class 150 / EN 1092-1 PN10/PN16 |
| Pressure-Temperature Rating | ASME B16.34 |
| Inspection & Testing | API 598 / ISO 5208 |
| Blow-out Proof Stem | Standard |
| Anti-Static Device | Standard |
| Fire Safe Design | API 607 / ISO 10497 (optional) |
| Low Emission Test | ISO 15848-1 (optional) |
| Top Flange | ISO 5211 (for direct actuator mounting) |
| Marking Standard | MSS SP-25 |
3. Main Materials (Typical – can be customized)
| Component | Standard (Carbon Steel Body) | Standard (Stainless Steel Body) | Optional Materials |
|---|---|---|---|
| Body | Carbon Steel (WCB) | Stainless Steel CF8M (316) | Cast steel, Ductile iron, Duplex SS, Aluminium Bronze, Titanium |
| Disc | Stainless Steel CF8M (316) | Stainless Steel CF8M (316) | Stainless Steel 304, Duplex SS, Aluminium Bronze |
| Stem | Stainless Steel 17-4PH | Stainless Steel 17-4PH | A182 F316, A182 F304, Monel |
| Seat Sealing | RPTFE (Reinforced PTFE) | RPTFE (Reinforced PTFE) | PTFE, TFM, PEEK, Metal hardfacing (Stellite) |
| Seat Support / Retainer | Carbon Steel | Stainless Steel CF8M | Duplex SS |
| Packing | Flexible graphite | Flexible graphite | PTFE V-ring, low emission packing (ISO 15848) |
| Gaskets | Flexible graphite + SS spiral wound | PTFE | Metal ring gasket |
| Fasteners | Alloy Steel A193 B7 (zinc plated) | Stainless Steel A193 B8 | Stainless Steel A193 B8M |
4. Outline Dimensions & Weight
| Dimension Parameter | Value (Typical, API 609 Category B Wafer) |
|---|---|
| Face-to-Face Length L | Approx. 68 mm (2.68 inches) |
| Overall Height (with gear operator) H | Approx. 800 – 850 mm (depending on actuation) |
| Top Height (flange face to top flange) H1 | Approx. 292 mm (11.50 inches) |
| Bottom Height H2 | Approx. 203 mm (7.99 inches) |
| Maximum Body Outer Diameter | Approx. 380 mm |
| Valve Weight (wafer, carbon steel, excl. actuator) | Approx. 31 – 35 kg |
| Valve Weight (wafer, stainless steel, excl. actuator) | Approx. 49 kg |
| Gear Operator Weight (reference) | Approx. 20 – 35 kg (depending on model) |
⚠ Dimensions and weights above are typical references and may vary by manufacturer. Final dimensions to be confirmed with manufacturer’s drawing. API 609 Category B is for double offset high performance valves; Category A is for concentric valves – face-to-face dimensions differ.
5. Pressure-Temperature Rating (ASME B16.34 – WCB/CF8M body)
| Temperature (°C) | Max. Working Pressure (bar) – Class 150 |
|---|---|
| -29 ~ 38 | 19.6 (285 psi) |
| 100 | 17.6 |
| 150 | 15.3 |
| 200 | 13.2 |
| 250 | 11.2 |
| 300 | 9.2 |
| 350 | 7.5 |
| 400 | 5.5 |
| 425 | 4.4 |
Note: Pressure ratings for high performance butterfly valves are generally based on the body material. Some manufacturers offer valves with a Cold Working Pressure (CWP) rating of 285 psi or 275 psi. The maximum working temperature for RPTFE/PTFE seats is typically 230°C to 260°C, well below the body’s maximum allowable temperature. With metal seats, the temperature range can be extended to -29°C ~ +425°C.
6. Performance Data
| Parameter | Value |
|---|---|
| Pressure Rating | Class 150 (19.6 bar / 285 psi @ 38°C) |
| Shell Test Pressure (water) | Approx. 29 bar (420 psi) |
| High-Pressure Seat Test (water) | Approx. 21 bar (305 psi) |
| Low-Pressure Air Seat Test | 6 bar (87 psi) |
| Allowable Differential Pressure | Full rated pressure, bi-directional |
| Leakage Rate (soft seat) | Zero leakage / Bubble-tight (API 598 Rate A / ISO 5208 Rate A) |
| Leakage Rate (metal seat) | Class IV – V (API 598) |
| Temperature Range (RPTFE seat) | -29°C ~ +260°C |
| Temperature Range (PTFE seat) | -29°C ~ +230°C |
| Temperature Range (metal seat) | -29°C ~ +425°C |
| Suitable Media | Water, oil, gas, steam, chemical media, compressed air, etc. |
| Flow Coefficient (Cv) full open @ 90° | Approx. 3,150 – 4,500 (varies by manufacturer) |
| Operating Torque (dry, reference) | Approx. 5,600 in·lbs (approx. 630 N·m) |
| Operating Torque (wet, reference) | Approx. 3,500 in·lbs (approx. 395 N·m) |
| Vacuum Service Capability | 29″ Hg |
| Valve Type | Double offset / Double eccentric, bi-directional sealing, zero leakage, high performance |
7. Double Offset Design Principle
The double offset design is an improvement over the single offset butterfly valve. The stem axis is offset from both the disc center and the valve body centerline (double eccentric). This design offers significant advantages:
-
Rapid disengagement – The sealing surfaces separate quickly during opening, reducing unnecessary compression and rubbing.
-
Long service life – Significantly reduces seat wear, extending seat life.
-
Low torque – Low opening/closing torque allows use of more economical actuators.
-
Bi-directional sealing – Provides tight shut-off in both directions, meeting full-rated bi-directional zero leakage requirements.
-
Fire safe design – The double offset construction combined with metal seats (e.g., Inconel 625 hardfacing) can meet API 607 fire test requirements.
8. Actuation Options
| Actuation Type | Remarks |
|---|---|
| Lever + limit stop | Only for low pressure, small sizes; not recommended for 10″ high performance butterfly valve |
| Worm gear operator | Standard configuration, with position indicator and mechanical stop; IPX8 optional |
| Electric actuator | On-off or modulating (4-20mA); direct mounting on ISO 5211 top flange |
| Pneumatic actuator | Double-acting or spring-return; with solenoid valve and limit switches |
| Gas-over-oil actuator | For emergency shut-down applications |
9. Key Features
-
Double offset design – Sealing surfaces disengage quickly during opening, minimal wear, low operating torque, long life
-
Bi-directional zero leakage – Suitable for stringent shut-off applications
-
Wafer connection – Compact construction, easy installation, lightweight
-
Blow-out proof stem – Compliant with API 609 for safety
-
Anti-static device – Provides electrical continuity between disc, stem and body
-
Field replaceable seat – Seat can be replaced without removing the stem and disc, facilitating maintenance
-
ISO 5211 top flange – Standardized actuator mounting interface for easy automation
-
Fire safe design (optional) – Compliant with API 607; retains some sealing integrity after fire exposure
10. Ordering Information
Please provide the following when ordering:
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Valve size (10″), pressure rating (Class 150)
-
End connection: Wafer
-
Body material (Carbon Steel WCB / Stainless Steel CF8M / other)
-
Disc material
-
Seat material (RPTFE / PTFE / PEEK / metal seated)
-
Sealing surface material
-
Actuation type (gear operator / electric / pneumatic)
-
Media name, temperature, and pressure
-
Special requirements (fire-safe API 607, anti-static, low emission packing ISO 15848, etc.)
-
Third-party inspection requirement (BV, DNV, TÜV, etc.)
