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Posts Tagged ‘granular’

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Valve – Slide

The Fresco slide valve range is used to control the flow of powders, pellets and granular materials.

These applications should be gravity only and offer unrestricted material flow.

The slide plate seals up to a machined face providing a product tight seal.

The slide valves can be manufactured from a range of materials and are able to suit most sizes and applications. The slide valves can be supplied in either pneumatic, electric, rack and pinion or manual versions. With square, rectangle or round options available they are by far the most cost effective versatile flow control device.

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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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Metering Screw Feeder

Metering screw feeders are used to accurately meter powdered, granular or flaky products in a process system.

Fresco offer both Volumetric (product flow rate by volume and set over a given time) and Gravimetric (product flow rate by weight and controlled using loadcells) types of metering screw feeders, with throughputs ranging from 1.76 l/ hr up to 13650 l/hr. Where very fluid powders are handled Fresco installs a pneumatically actuated flow control valve on the discharge of the screw tube to prevent flushing.

The crucial factor in achieving accuracy is consistent product bulk density by proper design and selection of an agitator in the conditioning zone above the screw auger. The agitator de-aerates and densifies the product to a uniform density and breaks any bridges, preventing hold-up in the hopper. This combination with a vast selection of screw sizes and types allows a wide cross-section of products to be fed very accurately.

Volumetric accuracy of ± 1% to ±2% and gravimetric accuracy of ±0.25% to ±1%, depending on the product, can be easily achieved. Weigh platforms fitted under the standard feeder linked to a batch controller provide accurate loss-in-weight feeding. Two-way RS 232 serial ports can be used to send and receive signals from other plant control systems. An easily removable front section provides access for cleaning and screw changes.

Fresco provides multiple weigh batching solutions, gain-in-weight and loss-in-weight systems that can be easily integrated with your equipment. Working with our electrical control and automation engineers we can provide high accuracy batching solutions that will ensure reliability and precision whatever your requirements.

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