Dual valve system with mechanical linkage

1. A dual valve system comprising:

a first valve body;

a first valve disc operably disposed within the first valve body, the first valve disc having a first disc geometry;

a second valve body;

a second valve disc operably disposed within the second valve body, the second valve disc having a second disc geometry; and

a mechanical linkage operably coupled to the first valve disc and the second valve disc, wherein the second disc geometry differs from the first disc geometry such that opening of a first flow area between the first valve body and the first valve disc occurs prior to opening of a second flow area between the second valve body and the second valve disc responsive to movement of the mechanical linkage, wherein the first disc geometry comprises a uniform thickness of the first valve disc, and the second disc geometry comprises a tapered thickness increasing radially outward from a pivot point of the second valve disc, and wherein a first outer edge of the first valve disc forming the first flow area has a first thickness that is less than a second thickness of a second outer edge of the second valve disc forming the second flow area, and the second valve disc has a partially spherical outer diameter.

2. The dual valve system of claim 1 , wherein the first valve body and the second valve body are arranged in parallel to each other.

3. The dual valve system of claim 1 , wherein the first valve body and the first valve disc comprise a first butterfly valve, and the second valve body and the second valve disc comprise a second butterfly valve.

4. The dual valve system of claim 1 , further comprising an actuator operably coupled to the mechanical linkage.

5. The dual valve system of claim 4 , wherein the actuator is configured to drive rotation of the first valve disc directly and drive rotation of the second valve disc through the mechanical linkage.

6. A gas turbine engine comprising a pneumatic system, 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, the first valve disc having a first disc geometry;

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;

a second valve disc operably disposed within the second valve body, the second valve disc having a second disc geometry; and

a mechanical linkage operably coupled to the first valve disc and the second valve disc, wherein the second disc geometry differs from the first disc geometry such that opening of a first flow area between the first valve body and the first valve disc occurs prior to opening of a second flow area between the second valve body and the second valve disc responsive to movement of the mechanical linkage, wherein the first disc geometry comprises a uniform thickness of the first valve disc, and the second disc geometry comprises a tapered thickness increasing radially outward from a pivot point of the second valve disc, and wherein a first outer edge of the first valve disc forming the first flow area has a first thickness that is less than a second thickness of a second outer edge of the second valve disc forming the second flow area, and the second valve disc has a partially spherical outer diameter.

7. The gas turbine engine of claim 6 , wherein the first valve body and the second valve body are arranged in parallel to each other.

8. The gas turbine engine of claim 6 , wherein the first valve body and the first valve disc comprise a first butterfly valve, and the second valve body and the second valve disc comprise a second butterfly valve.

9. The gas turbine engine of claim 6 , further comprising an actuator operably coupled to the mechanical linkage.

10. The gas turbine engine of claim 9 , wherein the actuator is configured to drive rotation of the first valve disc directly and drive rotation of the second valve disc through the mechanical linkage.

11. A method of operating a dual valve system, the method comprising:

driving a first valve disc having a first disc geometry to rotate using an actuator; and

translating a rotational force of the actuator through a mechanical linkage operably coupled to the first valve disc and a second valve disc, wherein the second valve disc has a second disc geometry that differs from the first disc geometry such that opening of a first flow area proximate to the first valve disc occurs prior to opening of a second flow area proximate to the second valve disc responsive to the rotational force, wherein the first disc geometry comprises a uniform thickness of the first valve disc, and the second disc geometry comprises a tapered thickness increasing radially outward from a pivot point of the second valve disc, and wherein a first outer edge of the first valve disc forming the first flow area has a first thickness that is less than a second thickness of a second outer edge of the second valve disc forming the second flow area, and the second valve disc has a partially spherical outer diameter.

12. The method of claim 11 , wherein the first valve disc operably disposed within a first valve body, the second valve disc is operably disposed within a second valve body, and the first valve body and the second valve body are arranged in parallel to each other.

13. The method of claim 12 , wherein the first valve body and the first valve disc comprise a first butterfly valve, and the second valve body and the second valve disc comprise a second butterfly valve.

14. The method of claim 11 , wherein the actuator is configured to drive rotation of the first valve disc directly and drive rotation of the second valve disc through the mechanical linkage.