Offset parallel valves with linkage system

A pneumatic system for a gas turbine engine, the pneumatic system comprising:

• a first pneumatic tube configured to receive a first airflow from the gas turbine engine;
• a first valve body coupled to the first pneumatic tube;
• a first valve disc operably disposed within the first valve body;
• a second pneumatic tube configured to receive a second airflow from the gas turbine engine;
• a second valve body coupled to the second pneumatic tube, the second valve body in parallel with the first valve body;
• a second valve disc operably disposed within the second valve body, the second valve disc laterally offset from the first valve disc;
• and
• a linkage system operably coupled to the first valve disc and the second valve disc, wherein the linkage system comprises an armature coupled to a grooved linkage member having a first groove and a second groove, the first groove configured to delay movement of the second valve disc as the first valve disc rotates and the second groove controlling a rotation angle of the second valve disc.