The LDV 4000 Vacuum Concept Conveying System is a dilute phase, medium to high velocity, low pressure, continuous vacuum conveying system for shorter distances. It is generally used to convey low to high density, non-abrasive and semi-abrasive materials. Examples include iron oxide, titanium dioxide, silica flour, cement, and limestone.

Typical conveying velocities are 1000 to 3000 feet per minute (5 m to 15 m/sec) and vacuum conveying pressures of up to 15 inches (381 mm) of Mercury (hg).

The material is fed into the conveying line on a continuous basis by vacuum. DC-5 Air Saver technology is used to minimize and optimize the low pressure supply air which is supplied by a low pressure positive displacement blower. The system includes a vacuum pickup nozzle, a vacuum filter receiver, a rotary airlock feeder and a positive displacement blower.