Channel and gate selection

Having decided on the HR system, the next step is to establish some details arising out of technical calculations, namely the choice of flow channel diameter for the manifold, the nozzle size and the gate diameter. 

Manifold channels. In the event that a complete manifold is purchased, the channel diameters are set by the manufacturer from technical data supplied by the customer, and the manufacturer guarantees that the manifold will do its job. 

In the event that the manifold is designed by the customer, if filling balance is achieved in a natural way, the channel diameters may be defined using general recommendations (see Chapter 4.2). The correctness of the adopted channel diameter may be checked by calculation using the condition of the admissible pressure loss in the flow path, but one must have the i](y) diagram for the given plastic (see Chapter 6.2). 

The admissible pressure losses in the HR system may be adopted on the basis of the following  

The pressure loss balance may take the following form  

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