Full size soft back / rubber valve seat for centerline butterfly valve
Heat / Cold Resistance of different rubbers
| Rubber Name | Short Name | Heat Resistance ℃ | Cold Resistance ℃ |
| Natural Rubber | NR | 100 | -50 |
| Nitrle Rubber | NBR | 120 | -20 |
| Polychloroprene | CR | 120 | -55 |
| Styrene Butadiene copolyme | SBR | 100 | -60 |
| Silicone Rubber | SI | 250 | -120 |
| Fluororubber | FKM/ FPM | 250 | -20 |
| Polysulfide Rubber | PS / T | 80 | -40 |
| Vamac(Ethylene/Acrylic) | EPDM | 150 | -60 |
| Butyl Rubber | IIR | 150 | -55 |
| Polypropylene Rubber | ACM | 160 | -30 |
| Hypalon. Polyethylene | CSM | 150 | -60 |
Production Devices in factory
| Equipment Name | Scope | Quantity |
| Open Mixing Mill | XSK400/300 | 4 |
| Vacuum Vulcanizing Machine | 250T | 12 |
| Vacuum Vulcanizing Machine | 500T | 2 |
| Plate Vulcanizing Machine | 250T | 4 |
| Internal Mixer | 35L | 2 |
| Injection Curing Machine | 200T | 1 |
| Cutting Machine | 660mm | 1 |
| Big Oven | 3 |
Testing equipment in factory
| Equipment Name | Range Ability | Model |
| Electronic Tensile Machine | 0 - 500N | WT2000E |
| No-roter Vulcanizer | Test lab | MDR-2000E |
| Mooney Viscometer | Test lab | MD-300 |
| Heat Aging Chamber | Test lab | 401A |
| Temperature and Humidity Chamber | Test lab | LTH-A4 |
| Image Measuring Instrument | Test lab | vms2010 |
| Thermoscope | -50 - 250℃ | TM-902C |
| Caliper | 10 - 160mm | C1012060517 |
| Digital Caliper | 0 - 150mm | KE606558 |
| Vernier Caliper (Inch) | 1 - 36 Inch | 6230 |
| Durometer | 0 - 100 | GS-706N |
| Digital Durometer | 0 - 100 | LX-A |
| Mini Electronic Scales | 410g | EB1133 |
| Electronic Scales | 0 - 6kg | DSO-861 |

Workshop Production Process Flow

Raw material storage → Incoming inspection → Batching → Mixing → Physical Property Test
→ Place → Clipping → Molding → Trim and Check → Packaging and shipping
