A gas lift system normally requires valves in the production tubing down the well. These valves open in sequence , injecting the gas that forces fluid in the tubing into the surface. The most common type of gas lift valve is the injection pressure operating (IPO)
| Specification of Injection Pressure-Operated Tubing-Retrievalve Valves(Conventional IPO) | ||||||||||
| Valve OD | 1 in (25.4mm) | 1.5 in (38.1mm) | ||||||||
| Ab Effective Bellows Area | 0.31 in (200mm2) | 0.77 in (496.8mm2) | ||||||||
| Port Size | 1/8 in (3.18mm) | 5/32 in (3.97mm) | 3/16 in (4.76mm) | 1/4 in (6.35mm) | 5/16 in (7.94mm) | 3/16 in (4.76mm) | 1/4 in (6.35mm) | 5/16 in (7.94mm) | 3/8 in (9.53mm) | 7/16 in (11.11mm) |
| Are of Port | 0.013in2 (8.4mm2) | 0.021in2 (13.55mm2) | 0.029in2 (18.71mm2) | 0.052in2 (33.55mm2) | 0.08in2 (51.61mm2) | 0.029in2 (18.71mm2) | 0.052in2 (33.55mm2) | 0.08in2 (51.61mm2) | 0.114in2 (73.55mm2) | 0.154in2 (99.35mm2) |
| Ap/Ab Ratio | 0.042 | 0.067 | 0.095 | 0.166 | 0.257 | 0.038 | 0.067 | 0.104 | 0.148 | 0.2 |
| 1-Ap/Ab | 0.958 | 0.933 | 0.905 | 0.834 | 0.743 | 0.962 | 0.933 | 0.896 | 0.8 | 0.739 |
| PPEF2 Ap/Ab/ (1-(Ap/Ab)) | 0.044 | 0.072 | 0.105 | 0.199 | 0.346 | 0.04 | 0.072 | 0.115 | 0.174 | 0.25 |
