This Auto Quantum Valve (AQV)-Electric Pressure Hold (EPH) is a pressure-hold style system with 120V AC. This is a two-operator control system, meaning if one operator depressurizes their hose, the blast pot will remain pressurized so the second operator can continue working without interruption.
With this setup, the blast machine pressurizes and depressurizes manually and the remoter control handle controls the on/off of the abrasive and air independently.