Standard Dual Plate Wafer Check Valve
Description
Technical Datasheet: Dual Plate Wafer Check Valve
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Tag No.: ____________________ Quantity: ____________________
1. General Information
| Item | Standard Configuration | User Specification / Remarks |
|---|---|---|
| Valve Type | Dual Plate Wafer Check Valve (Spring Assisted) | |
| Design Standard | API 594 / API 6D / ASME B16.34 / ISO 5752 | |
| Face-to-Face | API 594 Short Pattern / ISO 5752 Series 20 | |
| Flange Drilling | ASME B16.5 / ASME B16.47 / EN 1092-2 | |
| Inspection & Test | API 598 / ISO 5208 / EN 12266-1 | |
| Pressure Rating | Class 150 / 300 / 600 / 900 / 1500 / 2500 | PN10 / PN16 / PN25 / PN40 also available |
| Size Range | 2″ – 60″ (DN50 – DN1500) | |
| Temperature Range | -46°C to +600°C (Depending on materials) | |
| End Connection | Wafer Type (Fits between flanges) | |
| Installation Position | Horizontal or Vertical Upwards |
2. Design Features
| Feature | Description | Benefit |
|---|---|---|
| Dual Plate Design | Two spring-loaded plates hinged on a central pivot | Compact, lightweight, quick closing |
| Spring Assisted Closing | Torsion springs force plates closed when flow stops | Prevents slamming and water hammer |
| Short Face-to-Face | Very compact body length per API 594 | Saves space, reduces installation cost |
| Non-Slam Operation | Plates close before flow reversal | Eliminates damaging pressure surges |
| Low Cracking Pressure | Lightweight plates require minimal pressure to open | Suitable for low flow applications |
| Full Opening | Plates open to 85°-90° | Low pressure drop |
3. Bill of Materials (Standard Material Combinations)
| No. | Part Name | Carbon Steel Series | Stainless Steel Series | Ductile Iron Series | Notes |
|---|---|---|---|---|---|
| 1 | Body | WCB / A105 | CF8 / CF8M (304/316) | Ductile Iron / GGG50 | Epoxy coated |
| 2 | Plates / Discs | CF8 / CA15 | CF8 / CF8M | Ductile Iron / SS316 | Two plates |
| 3 | Seat (Metal) | Integral / STL faced | Integral | Integral | For metal seated valves |
| 4 | Seat (Soft) | Elastomer / Viton / EPDM / Buna-N | For soft seated valves | ||
| 5 | Springs | Inconel X-750 | Inconel X-750 | SS304 / Inconel | Corrosion resistant |
| 6 | Hinge Pin | SS410 | SS316 | SS316 | |
| 7 | Bushings / Bearings | SS410 / PTFE | SS316 / PTFE | Bronze / PTFE | |
| 8 | Stop Pin | SS410 | SS316 | SS316 | Limits plate travel |
| 9 | Retainer / Holder | CF8 / CA15 | CF8 / CF8M | – | For removable seat designs |
4. Technical Parameters & Performance
| Item | Specification |
|---|---|
| Medium | Water, Seawater, Oil, Gas, Steam, Chemicals, Air |
| Seat Type | Metal Seat (STL/Alloy) / Soft Seat (Elastomer/PTFE) |
| Sealing Performance | Zero Leakage (Soft Seat) / API 598 Class V or VI (Metal Seat) |
| Flow Direction | Unidirectional (Arrow marked on body) |
| Cracking Pressure | Very low (2-5 psi typical) |
| Flow Characteristic | Low pressure drop, plates open fully at low velocity |
| Spring Material | Inconel X-750 (Standard for high temp/corrosion) |
| Sour Service | NACE MR0175 / ISO 15156 compliant (Optional) |
5. Test Pressure (Reference: Per API 598 / ISO 5208)
| Pressure Class | Shell Test (Hydrostatic) | Seat Test (Hydrostatic) | Low Pressure Seat Test (Pneumatic) |
|---|---|---|---|
| Class 150 | 425 psi (2.9 MPa) | 315 psi (2.2 MPa) | 80 psi (0.6 MPa) |
| Class 300 | 1100 psi (7.6 MPa) | 825 psi (5.6 MPa) | 80 psi (0.6 MPa) |
| Class 600 | 2175 psi (15.0 MPa) | 1600 psi (11.0 MPa) | 80 psi (0.6 MPa) |
| PN10 | 15 bar (1.5 MPa) | 11 bar (1.1 MPa) | 6 bar (0.6 MPa) |
| PN16 | 24 bar (2.4 MPa) | 17.6 bar (1.76 MPa) | 6 bar (0.6 MPa) |
6. Dimensions & Weight (Reference: API 594 / Class 150 / Wafer Type)
| NPS | DN (mm) | L (Face-to-Face) mm | Weight (kg) approx |
|---|---|---|---|
| 2″ | 50 | 43 | 1.5 |
| 2-1/2″ | 65 | 46 | 2.4 |
| 3″ | 80 | 64 | 3.6 |
| 4″ | 100 | 64 | 5.7 |
| 5″ | 125 | 70 | 7.3 |
| 6″ | 150 | 76 | 9.0 |
| 8″ | 200 | 89 | 17.0 |
| 10″ | 250 | 114 | 26.0 |
| 12″ | 300 | 114 | 37-42 |
| 14″ | 350 | 127 | 55 |
| 16″ | 400 | 140 | 75-78 |
| 18″ | 450 | 152 | 101-119 |
| 20″ | 500 | 152 | 111-122 |
| 24″ | 600 | 178 | 172-174 |
| (Note: Dimensions are for reference only. For higher pressure classes or exact dimensions, refer to certified GA drawing.) |
7. Special Requirements / Options
-
Seat Type: Metal Seat (STL / Alloy) / Soft Seat (EPDM / Buna-N / Viton / PTFE)
-
Body Material: WCB / CF8/CF8M / Ductile Iron / LCC / Alloy Steel
-
Plate Material: CF8/CF8M / Duplex / Aluminum Bronze / Monel
-
Spring Material: Inconel X-750 (Standard) / SS316 / Hastelloy
-
NACE Compliance: MR0175 / ISO 15156 (Sour Service)
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Test Certificate: EN 10204 Type 3.1 / 3.2
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Coating: Epoxy coating (Min. 250 microns) / No coating / Special paint
-
Special Cleaning: For Oxygen / Food / Pharmaceutical service
-
Lifting Lug: Yes / No (For larger sizes)
-
Vertical Down Installation: Consult manufacturer
Design Notes:
-
Dual Plate Check Valves are also known as double disc check valves, split disc check valves, or butterfly check valves .
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They are 80-90% lighter than traditional swing check valves .
-
Retainer-less design options available to eliminate fugitive emissions .
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Suitable for pulsating flow conditions due to quick response of spring-assisted plates.
Note: This datasheet is prepared for a Dual Plate Wafer Check Valve per API 594 / API 598. Ensure selected materials, seat type, and pressure class are compatible with the specific service conditions (medium, temperature, pressure, and environmental requirements).
