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Posts Tagged ‘pneumatic conveying’

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Stainless Flexible Connector

Connection of pneumatic conveying lines to weigh hoppers / bins, is done by the use of the stainless steel flexible connectors.

Outlasting all other flexible connectors the interlocked sealed flexible tube provides the movement necessary to prevent weighing system errors without leaking powders into the environment.

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Pneumatic conveying – vacuum

Vacuum conveying is often a low cost method of pneumatic conveying where product can be conveyed up to 60m at rates up to 15tph.

It is ideally suited to the loading of extruder hoppers or direct loading of blenders or other such vessels.

The receiving vessel is put under vacuum and the product metered into the conveying line at a rate suitable to the conveying velocity and at the desired air to product ratio. 

Filters fitted to the receiving vessel or a stand alone filter separate the product from the conveying air prior to the air passing through the vacuum source.

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Valve – Rotary

We have an extensive range of rotary valves covering all applications.

The modular design of our rotary valves allows many different configurations using standard components.

The AL Airlock and BL Blow Through rotary valves have been designed for applications in the metering and pneumatic conveying of products in powder and granular form. Granular Valves are specially designed for gravity feeding and pneumatically conveying granular products.

The standard Airlock and Blow Through models are suitable for products up to a temperature of 150°C and a maximum pressure differential of 2 bar. Special configurations are available to accommodate temperatures between –200°C and +900°C. Pressure shock resistant up to 10 bar g and explosion proof models are also available.

The GL series of valves come in 5 sizes, covering a capacity range from approximately 5 to 79 litres per revolution at 100% filling. Standard models are suitable for handling products up to a temperature of 150°C and a maximum pressure differential of 1.5 bar. Other options are available on request.

Quick demountable options with easy slide rails for all valves are available ensuring quick and easy cleaning.

Drive options include chain, direct, air and hydraulic drive.

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Valve – Diverter

Fresco Systems has a great range of Diverter Valves to suit most applications.

Models include a Flap Type Diverter, Plug Type Diverter and a Fabricated Diverter Valve.

These Diverters have been designed to divert powders, pallets or granular materials from one discharge point to another with minimum degradation in pneumatic conveying and gravity applications. 

All versions are available in cast iron or stainless steel and are available in a large range of sizes.

There are four operating modes to choose from: pneumatic cylinder assembly, pneumatic actuator assembly, electrical actuator and hand operation. A smooth passage of product is guaranteed by precision machining and a good seal, ensuring a complete obstruction-free passage.

These user friendly designs require minimal maintenance and have no moving parts on the outside of the unit.

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Dust Collector

The Fresco Systems range of dust collectors is designed for sanitary and non-sanitary difficult to handle products as well as pneumatic conveying receival vessels which have high dust loadings.

Dust Collector filter selection is based on the product type and is either cartridge or bag type with normal filtration efficiency of 99.999% on 0.5micron material.

Filters access is provided through a large access hatch with removal options from the clean or dirty side of the plenum available.

Filters are cleaned via the continuous duty reverse pulse cleaning system which is designed for continuous online and offline operation. Shaker types are also available where reverse pulse cleaning is not suitable.

Flanged mounted or stand alone dust collector units manufactured from stainless steel or carbon steel materials of construction are available to suit most applications including the fan housing and impeller which can be manufactured from PVC.

Fresco also represents the Torit, DCE range of filters for standard applications

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Cyclone receivers are used for the efficient separation of dust and particles from an air stream.

Cyclone receivers can be used for general dust collection as a primary or pre-collector, and as a product receiver for pneumatic conveying.

Air and product enters the cyclone through the inlet pipe running tangentially to the cyclone body. As the air and product spiral down the body the product releases from the air stream and falls through the outlet, while the air vents up through the thimble and the top outlet.

  1. air volume
particle size, shape, density
inlet velocity
air to product ratio
air temperature
moisture content
  7. discharge fittings
electrostatic effects

The quality of manufacture including the smoothness of the internal cone welds, the smooth radiused inlet transition when entering the cyclone reduce turbulence and increases efficiencies.

Efficiencies can be calculated when all the parameters are known. Larger cyclone receivers can be made to order from a range of materials.

The outlet of the cyclone can be provided with a vortex box, rotary valve, double dump valve etc to suit any given application.