An apparatus for preparing a beverage from capsules, including a liquid supply system (12) comprising a water reservoir (14) and a pump (16), an extraction block (8) comprising an injection block (9) including an injector head (28) and a housing (40), and an extraction mechanism (6) comprising a capsule holder (10) configured to receive a capsule. The injector head comprises an injection plate (27) having plurality of inflow injectors (34) with internal liquid channels (37) configured to pierce through a lid (30) of a capsule (26). The injector head comprises a water inlet (42) connected to the water reservoir (14) and an actuating mechanism (50) configured to displace the injector head between an open position whereby the capsule can be inserted or removed from the extraction block to a closed position whereby the injector head is sealingly closed against the capsule holder.