--- <1 to ~2,000 | clean liquids, gases, pressure reduction pneumatic spring-diaphragm |
| **butterfly** equal-% (approx.) higher than equal-size globe large water, air, low-viscosity chemical lines rack-and-pinion, electric quarter-turn **v-port ball** near-linear 20–30% above equal pulp, wastewater, slurry, food processing rotary with positioner **diaphragm** quick opening low moderate corrosive, abrasive, slurry-laden fluids piston or diaphragm **needle** linear, fine metering typically below 5 sample lines, instrument calibration small manual |

## how does a control valve work?

![technical diagram of ctgv showcasing internal parts like the plug, retaining ring, and body, specification table, labeled inlet outlet ports, red arrows indicating flow path.](https:>