Investment Casting & Industrial Valves 
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Vertical Lift Check Valve (Cast Carbon Steel Non-Return Valve)
- Nominal Diameter: DN32-DN200
- 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.
Test Pressure
| Test Item | Shell Test | Seal Test | Air Seal Test | |
| Medium | Water | Air | ||
| Nominal Pressure (MPa) | 1.6 | 2.4 | 1.8 | 0.6 |
| 2.5 | 3.8 | 2.8 | ||
| 4.0 | 6.0 | 4.4 | ||
| 6.4 | 9.6 | 7.0 | ||
Dimensions (mm)
| DN | H | D | D1 | D2 | b | f | z-Ød |
| PN1.6MPa | |||||||
| 32 | 145 | 135 | 100 | 78 | 18 | 2 | 4-Ø18 |
| 40 | 160 | 145 | 110 | 85 | 18 | 3 | 4-Ø18 |
| 50 | 170 | 160 | 125 | 100 | 20 | 3 | 4-Ø18 |
| 65 | 180 | 180 | 145 | 120 | 22 | 3 | 4-Ø18 |
| 80 | 200 | 195 | 160 | 135 | 22 | 3 | 8-Ø18 |
| 100 | 220 | 215 | 180 | 155 | 24 | 3 | 8-Ø18 |
| 125 | 270 | 245 | 210 | 185 | 28 | 3 | 8-Ø18 |
| 150 | 300 | 280 | 240 | 210 | 30 | 3 | 8-Ø18 |
| 200 | 390 | 335 | 295 | 265 | 34 | 3 | 12-Ø23 |
| PN2.5MPa | |||||||
| 32 | 150 | 135 | 100 | 78 | 18 | 2 | 4-Ø18 |
| 40 | 160 | 145 | 110 | 85 | 18 | 3 | 4-Ø18 |
| 50 | 170 | 160 | 125 | 100 | 20 | 3 | 4-Ø18 |
| 65 | 175 | 180 | 145 | 120 | 22 | 3 | 8-Ø18 |
| 80 | 200 | 195 | 160 | 135 | 22 | 3 | 8-Ø18 |
| 100 | 215 | 230 | 160 | 160 | 24 | 3 | 8-Ø18 |
| 125 | 275 | 270 | 220 | 188 | 28 | 3 | 8-Ø23 |
| 150 | 295 | 300 | 250 | 218 | 30 | 3 | 8-Ø25 |
| 200 | 380 | 360 | 310 | 278 | 34 | 3 | 12-Ø25 |
Materials
| Component | Material | |||
| Body/ Bonnet | CF8 | CF8M | CF3M | WCB |
| Wedge | CF8 | CF8M | CF3M | WCB |
| Spring | CF8 | CF8M | CF3M | WCB |
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.
