ports 44 45 are already provided with the associated sealing means 47 and the seal 94 and the seal holder 95 are pushed onto and located on the rear end of the valve cartridge 32 by way of example fig1 shows an advantageous pneumatic interconnection arrangement for the valve cartridge 32 as each of the valve cartridges 32 a 32 b 32 c and 32 d comprises two bending transducers 75 and each bending transducer 75 is precisely assigned to one of the outlet ports 44 a 44 b 44 c 44 d 45 a 45 b 45 c 45 d pressure can optionally be applied to the operating ports 41 a 41 b 41 c and 41 d at a first or a second pressure level in the illustrated embodiment in each of the valve cartridges 32 there are provided a first bending transducer 75 g which adopts a closed neutral position relative to the associated outlet port 44 or 45 nc u2014 normally closed and a second bending transducer 75 o which adopts an open neutral position relative to the associated outlet port 44 or 45 no u2014 normally open in the case shown in fig1 the outlet ports.