Process for pressing agricultural products to extract juice and device for using process

A process of juice extraction from grapes, berries, fruits, vegetables, and like agricultural products using a press having at least one pressure increase sequence to separate solids and liquids from such products and including control and adjustment of the press during juice extraction, the steps comprising supplying the products from which juice is to be extracted into a receptacle of a press and there being a pressing element in said receptacle, measuring one of the rate of extraction or the quantity of liquid extracted from the products to be pressed before, during or after pressing or the amount of partially pressed products remaining after pressing to obtain a first value thereof, comparing the measured rate, quantity or partially pressed products with corresponding predetermined second values thereof to obtain a resulting value of the difference between the corresponding first and second values, beginning, continuing, interrupting, modifying or completing the pressing operation in response to a said resulting value, the pressing process being at least partially programmed.