Multi-stage vacuum generators produce a maximum depression of 90% and have various suction capacities. The compressed air supply pressure ranges from 1 to 6 bar.

Multi-stage generators utilize the kinetic energy of the compressed feeding air by passing it through a series of appropriately sized ejectors before releasing it into the atmosphere. This system allows for a lower consumption of compressed air, at the same flow rate, compared to single-stage vacuum generators.

Some families of multi-stage vacuum generators also have a Low Pressure version that allows excellent performance with compressed air supply at lower pressures (up to 4 bar), enabling significant energy savings.

To reduce maintenance interventions, it is important to implement a good filtration of both the compressed and aspirated air.

Features

• Suction capacity from 3 to 750 m³/h
• Ultimate pressure 100 mbar abs
• They can be used in potentially explosive atmospheres with compressed air supply only
• They can be used in environments with variable temperatures from -20 to +80 °C
• Made of anodized aluminum (with ejectors and stainless steel screws)
• Sealing gaskets and flap valves in EPDM or VITON on request

Advantages

• High quietness and possibility of continuous use (without heat development) due to the absence of moving parts
• Small size, light, compact, and space-saving in relation to their large suction capacity

The single-stage and multi-stage generators can be multifunctional by assembling:

• A micro solenoid valve that supplies compressed air to the generator
• A micro solenoid valve for blowing out the compressed air
• A flow regulator essential for dosing the exhaust air
• A digital vacuum switch with a display and LEDs that indicate the switchings to manage the supply of compressed air and provide a signal for safely starting the cycle

Operation

By activating the micro solenoid valve for compressed air supply, the generator begins to create the required vacuum. When the maximum specified value is reached, the vacuum switch interrupts the supply of compressed air to reduce energy consumption.

In this way, the vacuum level is maintained within the predefined safety values (hysteresis), allowing significant compressed air savings. A second signal from the vacuum switch, also adjustable and independent of the first, can be used to start the work cycle when the achieved vacuum level is appropriate for use.

At the end of the work cycle, the air-feeding micro solenoid valve deactivates, and simultaneously, the exhaust micro solenoid valve activates to quickly restore atmospheric pressure for further use.