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7800 Series Available Orifice Sizes
| API ORIFICE SIZE | ORIFICE DIAMETER (in) | ORIFICE AREA (sq in) | Kd (gas) | Kd (liquid) | SLOPE | FLOW FACTOR | MINIMUM SET PRESSURE (psig) | MAXIMUM SET PRESSURE (psig) |
| 0.25 | 0.25 | 0.049 | 0.699 | 0.45 | 21.2 | 0.84 | 15 | 6800 |
| 0.50 | 0.52 | 0.212 | 0.290 | 0.45 | 1.128 | 3.63 | 15 | 2500 |
| 0.75 | 0.775 | 0.4750 | 0.429 | 0.45 | 3.710 | 8.07 | 15 | 2000 |
Elastomer Materials
| Material | Durometer | Temperature | Set Pressure | ||
| Min | Max | Min | Max | ||
| Viton | 90 | -15 | 400 | 50 | 3000 |
| Viton | 50 | -15 | 400 | 15 | 150 |
| HNBR | 80 | -25 | 325 | 15 | 2500 |
| EPDM | 80 | -70 | 250 | 15 | 2500 |
| TEFLON | - | -420 | 450 | 250 | 5500 |