08.02.2010 | Editor: Marcel Dröttboom
A new barrel dosing system uses a special butterfly valve to allow product discharging within a polyethylene liner in a closed system, while controlling the weight with maximum precision.
The standard version of the system designed by Co.Ra. is composed of an adaptor that connects the machine to be served with a butterfly valve of type Doublevalve, a system to fix the liner, composed of stainless steel pipe, a halo and an exhaust filter, a dosage terminal with an incorporated display and keyboard and a sensor charged scale. The dosage system is equipped with DCS type Profibus connection, Ethernet, RS232 and can be connected to a multi strip printer or label maker. A version for hazardous environments Zone 1/21 (ATEX 94/09/CE) is also available. The maximum dosage precision obtainable is +/-50g.
The butterfly valve has a central rotor inside and it can be clamped under the discharge outlet of the upstream system. The valve is tcompletely made of stainless steel AISI 316L, the gasket is in silicone according to FDA 177.2600 norms. Available butterfly diameters are 150mm, 200mm and 250mm, rotor diameters are 80mm and 100mm. Actuation is done by a double acting 180 degree pneumatic actuator in anodized aluminium, the control panel can be either plastic or stainless steel. The valve body is in satin finish, vane and rotor are mirror polished.
Operation cycle is composed by two main step: heavy dosage and trickle dosage. During the first step the Doublevalve opens and allows the quick passage of 95 percent of the product until the set weight is reached. During the second step the valve closes and the rotor (located in the centre of the valve) begins to move and allows trickle feed until total weight of the product is reached.
The work cycle requires that an empty container is placed on the base of the sensor charged scale of the dosage system, the closing of the final part of the liner with a special clip, and the extraction of the liner from its related support located under the dosage valve, until it touches the bottom of the container. At this point it is necessary to push the start button on the dosage terminal, once the dosage is obtained, the bag is closed by means of a clip and another clip is placed about 10 centimetre higher than the first one. Finally it is necessary to cut the liner between the two clips and the container can be removed from the sensor charged base.
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