Investment Casting & Industrial Valves 
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Model: GB
Flanged Swing Check Valve (GB Non-Return Valve)
- Nominal Diameter: DN15-DN500
- Materials: 316, CF8M, 1.4408, WCB, 304, CF8, etc.
- Design & Manufacture: GB/T 12236
- Face-to-Face: GB/T 12221
- Flange End: JB/T79
- Inspection & Testing: JB/T9092
- Surface Treatment: Pickling, Passivation, Polishing (or as per customer request)
- Operating Temperature: ≤ 120°C
- Suitable Media: Water, Steam, Oil, Gas, Acids, Alkalis, etc.
Materials
| Body/Bonnet | CF8 | CF8M | CF3M | WCB | |
| Wedge | Cf8 | CF8M | CF3M | WCB | |
| Gasket | PTFE/ Graphite | ||||
| Bolt | Stainless Steel | 35CrMoA | |||
| Nut | Stainless Stee | 45, 35CrMoA | |||
Test Pressure
| DN | Top Flange | Bottom Flange | Sealed Seat | |||
| D1 | D2 | D3 | D4 | D5 | D6 | |
| 25 | 115 | 85 | 135 | 100 | 70 | 40 |
| 32 | 135 | 100 | 145 | 110 | 75 | 55 |
| 40 | 145 | 110 | 160 | 125 | 100 | 65 |
| 50 | 165 | 125 | 180 | 145 | 85 | 70 |
| 65 | 180 | 145 | 195 | 160 | 135 | 90 |
| 80 | 195 | 160 | 215 | 180 | 155 | 130 |
| 100 | 215 | 180 | 245 | 210 | 195 | 135 |
| 125 | 245 | 210 | 280 | 245 | 180 | 1445 |
| 150 | 280 | 240 | 335 | 295 | 210 | 185 |
| 200 | 335 | 295 | 405 | 355 | - | - |
Dimensions (mm)
| DN | L | D | D1 | D2 | b | z-Ød | H |
| H44W-16P(R) | |||||||
| 15 | 130 | 95 | 65 | 45 | 14 | 4-Ø14 | 95 |
| 20 | 150 | 105 | 75 | 55 | 14 | 4-Ø14 | 105 |
| 25 | 160 | 115 | 85 | 65 | 16 | 4-Ø14 | 115 |
| 32 | 180 | 135 | 100 | 78 | 16 | 4-Ø18 | 135 |
| 40 | 200 | 145 | 110 | 85 | 16 | 4-Ø18 | 140 |
| 50 | 230 | 160 | 125 | 100 | 16 | 4-Ø18 | 148 |
| 65 | 290 | 180 | 145 | 120 | 18 | 4-Ø18 | 160 |
| 80 | 310 | 195 | 160 | 135 | 20 | 8-Ø18 | 172 |
| 100 | 350 | 215 | 180 | 155 | 20 | 8-Ø18 | 178 |
| 125 | 400 | 245 | 210 | 185 | 22 | 8-Ø18 | 250 |
| 150 | 480 | 280 | 240 | 210 | 24 | 8-Ø18 | 255 |
| 200 | 550 | 335 | 295 | 265 | 26 | 12-Ø23 | 295 |
| 250 | 650 | 405 | 355 | 320 | 26 | 12-Ø25 | 442 |
| 300 | 750 | 460 | 410 | 375 | 30 | 12-Ø25 | 450 |
| 350 | 850 | 520 | 470 | 435 | 34 | 16-Ø25 | 540 |
| 400 | 950 | 580 | 525 | 485 | 36 | 16-Ø30 | 555 |
| 500 | 1150 | 705 | 650 | 608 | 44 | 16-Ø34 | 650 |
Investment Casting & Valve Manufacturing Since 1987
At SDPLDL, we are a trusted manufacturer specializing in precision investment casting and industrial valves for global markets. We operate our own manufacturing facility featuring over 200 sets of advanced manufacturing equipment and an in-house testing center equipped with 16-ton dynamic balancing machines. Our integrated manufacturing capabilities allow us to seamlessly produce precision investment casting valves, custom stainless steel large-diameter valves, and slurry valves under strict compliance with ISO 9001 standards.
