Valves improve dust collection

Edited by the Engineeringtalk editorial team Feb 7, 2006

Efficiency of dust collector systems improved with redesigned dust collection valves in sizes from 1.9 to 2.5cm with faster opening and closing times and less noise.

Asco Joucomatic is improving the efficiency of dust collector systems with its redesigned range of Power Pulse dust collection valves.

Available in sizes from 1.9 to 2.5cm, the valves have faster opening and closing times with less noise for improved dust collection; and also a reduction in overall valve size to aid integration into OEM dust collector systems.

Key to the improved efficiency of the Series 353/800 Power Pulse valves is a piston cartridge that reduces the stroke volume that needs to be exhausted through the pilot of a conventional diaphragm dust collector valve.

The problem with a large volume is that it results in slower opening and closing of the valve, which reduces its peak performance and causes uneconomical use of compressed air.

In addition, the decompression of exhaust air from a large volume creates excessive noise during valve operation.

By reducing the stroke volume, the valves can deliver faster opening and closing times and longer operating life.

The combination of the piston cartridge with a redesigned valve bonnet achieves reductions in noise during operation.

The integral bonnet has been constructed with an expansion chamber into which pressurised air expands.

The effect of this is to reduce the air to a value that generates less noise when exhausting to atmosphere.

The piston cartridge design has the options of internal exhaust and high temperature operation.

The reduction in valve size was achieved without affecting flow performance.

The internal exhaust option will appeal to OEMs and users in applications where there is a possibility of dirt build-up blocking the valve silencer.

In these applications, the two-piece design of the piston cartridge, consisting of one moving and one solid fixed part, makes it possible to exhaust pilot air directly into the outlet port of the valve.

To get the best results from this option, the valves have an integral venting tube.

The cartridge is normally made from polyacetal for operation up to 85C; however, with the option of a high temperature polyamide piston, continuous operation up to 150C is provided, with a maximum up to 180C.

The Quick Mount connection system eliminates the time-consuming, thread-cutting and sealing to the blow-pipe experienced with conventional dust pulse valves.

For this range, Quick Mount has been modified to integrate an anti-rotation clamp that fits into a slot in the body of the valve, preventing it from rotating after assembly.

As standard, the valves use high quality F-class epoxy moulded coils; however, the user has the option of waterproof solenoids and explosion proof coils conforming to Atex 94/9/EC for use in potentially explosive atmospheres (gas and dust).

By providing a package conforming to the European Pressure Equipment Directive 97/23/EEC, it will overcome the problem of CE certification for OEMs that traditionally build their own tank systems.

For applications where a fully assembled system is not required, there are complementary products for complete dust collector control.

These include sequential controllers, pilot valves and pilot boxes, pressure differential modules and air preparation equipment.

During the first quarter of 2006, the larger 3.8cm Power Pulse valve will also be available.