The LDV 4000 vacuum conveying system is similar to the LDV 2000 system with additional performance features to provide more reliability and capability. It has the ability to convey higher bulk density materials at a lower air-to-solids ratio with better efficiency and a lower conveying line velocity than the LDV 2000 system.

The low cost LDV 4000 system can also easily handle most lightweight, non-abrasive, fine, granular, low or high bulk density, fibrous and/or large light particle materials where degradation is not a concern.

The primary feature of the LDV 4000 system over the LDV 2000 system is that it uses Dynamic Air's exclusive Dyna-Chek 4 booster fittings spaced along the conveying line, which optimizes the air introduced. Also, the minimum pickup velocity is reduced to about 1,000 to 3,000 feet per minute and the terminal velocity is reduced to about 4,000 to 7,000 feet per minute. Due to air pressure limitations, practical conveying distances should generally be limited to about 500 lineal feet.

Primary components of the LDV 4000 system include a pickup nozzle at the beginning of the system; a method to control material flow; a vacuum conveying line with couplings and tubing bends; Dyna-Chek 4 booster fittings; a vacuum filter/receiver; a secondary filter and a positive displacement blower. The positive displacement blower, which is used as the power source, produces vacuum levels to about 14 inches of mercury. For continuous conveying applications, a rotary airlock or optional gatelock hopper is installed at the end of the system.

Unlike the LDV 2000 system, where all the air needed to convey is added at or near the vacuum pickup nozzle, the LDV 4000 system generally requires the displacement air to be added at the beginning. The balance of the air needed to convey is then introduced through the Dyna-Chek 4 booster fittings.

Material is usually metered into the pickup nozzle by a volumetric feeder, such as a rotary airlock, and/or by controlling the air volume and pressure. The material is then mixed with the conveying air and moves through the conveying line to the vacuum filter/receiver.