More choice in screw compressors
Two new models extend a range of screw-type air compressors aimed at pneumatic conveying and general process use

The Delta Screw air compressors now cover the range 180–15,000 m3/h (intake volume), with seven belt-drive and eight direct-drive models. The latest additions to the series are the VM 37 R and VML 40 R belt-drive models, with intake flowrates of 1,300–2,600 m3/h and 800–2,600 m3/h respectively.

Delta Screw compressors are designed for air and
other inert gases, and are used in many general-purpose process applications. These include wastewater treatment and especially pneumatic conveying. Depending on the model, discharge pressures for the Delta Screw range are 3 bar a or 4.5 bar a. The machines can also be used as vacuum pumps down to 0.3 bar a, or 0.15 bar a on request. Compared with the direct-drive models, belt-drive compressors like the new VM 37 R and VML 40 R offer greater flexibility when choosing the operating speed, and lower capital costs.

No manual belt tensioning
The design of the compressor eliminates one traditional drawback of belt-drive machines: the need for periodic re-tensioning of the drive belt. In the Delta Screw range, the drive motor is mounted on a hinged support that allows the weight of the motor itself to tension the belt automatically. According to the company, manual tensioning is not needed even after long periods of operation.
The machines can be supplied with the Aerzen AS 200 control system, which is said to provide savings of more than 50 percent compared to a conventional PLC. The AS 200 controller monitors and records the intake and discharge pressures, discharge temperature, oil temperature and oil pressure. Information is displayed in a choice of languages and units, and can be transmitted to a supervisory control system via a serial link or modem. The controller also warns users when scheduled maintenance is required.