Pneumatic valve

A pneumatic valve for a fluid bladder of a pneumatic seat adjustment device of a vehicle seat, comprising:

• a first valve chamber configured to be connected to a fluid source;
• a second valve chamber separate from the first valve chamber and configured to be connected to the fluid bladder;
• a third valve chamber separate from the first valve chamber and the second valve chamber and configured to be connected to an environment of the pneumatic valve;
• a fourth valve chamber separate from the first valve chamber, the second valve chamber and the third valve chamber and fluidically connected to the first valve chamber via a first fluid passage, fluidically connected to the second valve chamber via a second fluid passage and fluidically connected to the third valve chamber via a third fluid passage;
• and
• an actuator unit comprising a membrane element disposed in the fourth valve chamber and an actuator element disposed in the third valve chamber, wherein the actuator element is coupled to the membrane element and configured to move the membrane element between a first position in which the first fluid passage is opened and the third fluid passage is closed, and a second position in which the first fluid passage is closed and the third fluid passage is opened.