H77 WAFER BUTTERFLY CHECK VALVE
Item | Description |
|---|---|
Product Name | H77 WAFER BUTTERFLY CHECK VALVE |
Certificates | ABS, LR, BV, DNV, RINA, CCS |
FOB Price | Get Latest Price Now |
Warranty | 12 months (unless otherwise specified) |
Place of Origin | China |
Overview
1. PRODUCT OVERVIEW
The H77 Wafer Butterfly Check Valve is a dual-plate (double-disc) wafer-type non-return valve designed to automatically prevent backflow in piping systems. The valve features a compact wafer body that is clamped between two pipeline flanges, significantly reducing face-to-face dimensions and overall weight compared to conventional swing check valves. The dual-plate design allows for rapid closure with minimal water hammer, making it suitable for a wide range of marine, industrial, and process applications.
The H77 series is available in soft-seal (H77X) and hard-seal (H77H/H77Y/H77W) configurations to accommodate different media and temperature requirements. Common body materials include cast iron, ductile iron, carbon steel, and stainless steel.
2. WORKING PRINCIPLE
The H77 butterfly check valve consists of two semi-circular discs mounted on a central hinge pin. When forward flow occurs, the pressure of the medium pushes the discs open. The discs are fully open at a very small cracking pressure. When flow decreases or reverses, the spring-loaded discs close rapidly against the seat to prevent backflow.
Key operational features:
Dual-plate design: Two spring-loaded semi-circular discs provide rapid, non-slam closure and low pressure drop.
Wafer connection: The valve is clamped between two pipeline flanges using through-bolts, resulting in a compact and lightweight structure.
Spring-assisted closure: The springs ensure quick disc closure and minimize water hammer.
Horizontal or vertical installation: The valve can be installed in horizontal or vertical pipelines; for horizontal pipelines, the hinge pin must be vertical.
3. DESIGN & MANUFACTURING STANDARDS
| STANDARD | DESCRIPTION |
|---|---|
| API 594 | Check Valves: Flanged, Lug, Wafer, and Butt-welding — Design, face-to-face dimensions, pressure-temperature ratings, inspection and testing |
| API 6D | Pipeline Valves — Applicable for critical service |
| API 598 | Valve Inspection and Testing — Shell and seat testing |
| ASME B16.34 | Pressure-Temperature Ratings |
| ASME B16.5 | Pipe Flanges and Flanged Fittings |
| ASME B16.10 | Face-to-Face and End-to-End Dimensions of Valves |
| JB/T 8937 | Chinese standard for wafer check valves |
| ISO 5208 | Industrial valves – Pressure testing of valves |
Design Standard: API 594 / API 6D / JB/T 8937
Face-to-Face: API 594 / JB/T 8937 / EN 558
Testing Standard: API 598 / ISO 5208
4. MATERIALS OF CONSTRUCTION
| PART NAME | MATERIAL OPTIONS | STANDARD |
|---|---|---|
| Body | Cast Iron, Ductile Iron, Carbon Steel (WCB), Stainless Steel (CF8/CF8M/CF3/CF3M) | ASTM A126, ASTM A395, ASTM A216, ASTM A351 |
| Disc | Ductile Iron, Stainless Steel (CF8/CF8M), Aluminum Bronze (C95400) | ASTM A395, ASTM A351, ASTM B148 |
| Seat | NBR, EPDM, Viton, Neoprene; Metal Seat (Stellite Overlay) | — |
| Stem | Stainless Steel (416/304/316) | ASTM A276 |
| Spring | Stainless Steel (316) | ASTM A313 |
5. PRESSURE & TEMPERATURE RATINGS
| PARAMETER | SPECIFICATION |
|---|---|
| Nominal Pressure | PN10 / PN16 / PN25; ASME Class 125 / 150 / 300 / 600 |
| Working Temperature | Soft Seal: -10°C ~ +80°C (NBR) / -20°C ~ +120°C (EPDM) |
| Hard Seal: -29°C ~ +425°C (Stellite Overlay) | |
| Leakage Rate | ISO 5208 / API 598 |
| Face-to-Face | API 594 (Short face-to-face) |
| End Connection | Wafer (Clamped between flanges) |
| Installation Position | Horizontal or vertical; for horizontal pipelines, hinge pin must be vertical |
6. SIZE RANGE
| PARAMETER | RANGE |
|---|---|
| Nominal Size (DN) | DN40 ~ DN1200 (1.5" ~ 48") |
| Nominal Size (Extended) | Up to DN1500 (60") available for specific applications |
7. DIMENSIONS
TABLE 1 – TYPICAL DIMENSIONS FOR H77X-10 / H77X-16 (PN10 / PN16) (Unit: mm)
| NOMINAL SIZE DN | FACE-TO-FACE L | BODY O.D. D | SEAT I.D. D3 (H77X) | SEAT I.D. D3 (H77H/Y/W) | BOLT HOLE P.C.D. D2 | BOLT HOLE D1 | BOLT SIZE |
|---|---|---|---|---|---|---|---|
| 40 | 43 | 92 | 55 | — | 110 | — | 4-M16 |
| 50 | 43 | 107 | 65.5 | 46 | 125 | — | 4-M16 |
| 65 | 46 | 127 | 81 | 65 | 145 | — | 4-M16 |
| 80 | 64 | 143 | 95 | 80 | 160 | — | 8-M16 |
| 100 | 64 | 162 | 117.5 | 102 | 180 | — | 8-M16 |
| 125 | 70 | 192 | 145.5 | 127 | 210 | — | 8-M16 |
| 150 | 76 | 218 | 170.5 | 152 | 240 | — | 8-M20 |
| 200 | 89 | 273 | 227.5 | 203.6 | 295 | — | 8-M20 |
| 250 | 114 | 328 | 266 | 254 | 350 | — | 12-M20 |
| 300 | 114 | 380 | 312 | 305 | 400 | — | 12-M20 |
| 350 | 127 | 438 | 362 | 350 | 460 | — | 16-M20 |
| 400 | 140 | 489 | 406 | 400 | 515 | — | 16-M24 |
Note: For H77X-16, dimensions may vary slightly. For detailed dimensional data per size and pressure class, please consult the manufacturer's certified drawing.
8. KEY FEATURES & BENEFITS
| FEATURE | BENEFIT |
|---|---|
| Dual-plate wafer design | Compact, lightweight, low face-to-face dimension; lower installation cost |
| Spring-assisted closure | Fast closing, minimal water hammer and non-slam performance |
| Short face-to-face | Saves space in piping systems |
| Wide material selection | Cast iron to stainless steel; suitable for various media and environments |
| Soft or hard sealing | Soft seal (NBR/EPDM) for low temperature; hard seal (Stellite) for high temperature |
| Horizontal or vertical installation | Flexible pipeline layout |
| Low pressure drop | Streamlined flow path with minimal resistance |
| Easy installation | Clamped between standard flanges; requires only one set of through-bolts |
9. TYPICAL APPLICATIONS
Marine & Shipbuilding – Seawater, fresh water, fuel oil, lubricating oil systems
Water & Wastewater – Pump discharge, distribution networks
Petroleum & Chemical – Process piping, backflow prevention
Power Generation – Cooling water, condensate, feedwater systems
HVAC – Chilled water, heating systems
Food & Pharmaceutical – Sanitary piping systems
10. ORDERING INFORMATION
To ensure an accurate quotation, please provide the following information:
| ITEM | REQUIRED INFORMATION |
|---|---|
| 1. Valve Type | H77 Wafer Butterfly Check Valve |
| 2. Model | H77X (Soft Seal) / H77H / H77Y / H77W (Hard Seal) |
| 3. Nominal Size | DN40 ~ DN1200 (1.5" ~ 48") |
| 4. Nominal Pressure | PN10 / PN16 / PN25; ASME Class 125 / 150 / 300 / 600 |
| 5. Body Material | Cast Iron / Ductile Iron / WCB / CF8 / CF8M |
| 6. Disc Material | Ductile Iron / Stainless Steel / Aluminum Bronze |
| 7. Seat Material | NBR / EPDM / Viton / Metal Seat (Stellite) |
| 8. End Connection | Wafer |
| 9. Face-to-Face Standard | API 594 / JB/T 8937 / EN 558 |
| 10. Flange Standard | ASME B16.5 / EN 1092 / JIS B 2210 / GB/T 2501 |
| 11. Operating Medium | Water / Seawater / Oil / Gas / Steam |
| 12. Operating Temperature | °C |
| 13. Required Certificates | Mill Test Certificate / Class Certificate / ISO 5208 / API 598 |
| 14. Quantity | pcs / sets |
| 15. Required Delivery Date | — |
