Pressure relief valve with rotating damper

1. A combustible gas burner comprising:

gas flow conduit including an outlet; and

a pressure relief valve comprising:

a valve seat at the outlet;

a valve body configured to engage the valve seat and move along a main axis relative to the valve seat in response to a pressure at the outlet; and

a valve body rotator configured to rotate the valve body about the main axis in response to movement of the valve body along the main axis relative to the valve seat.

2. The burner according to claim 1 , wherein the valve body rotator comprises a mechanical linkage having a first end attached to the gas flow conduit, and a second end attached to the valve body, wherein the mechanical linkage drives rotation of the valve body about the main axis in response to movement of the valve body along the main axis relative to the valve seat.

3. The burner according to claim 2 , wherein:

the valve body rotator includes a crank arm configured to rotate about the main axis, the crank arm including a distal end that is radially displaced from the main axis; and

the second end of the mechanical linkage is attached to the distal end of the crank arm.

4. The burner according to claim 3 , wherein the crank arm moves along the main axis relative to the valve seat with movement of the valve body along the main axis.

5. The burner according to claim 2 , wherein the mechanical linkage comprises:

a linkage arm having first and second ends;

a first mechanical joint comprising a first end having a fixed position relative to the gas flow conduit, and a second end that is attached to the first end of the linkage arm;

a second mechanical joint comprising a first end that is attached to the second end of the linkage arm, and a second end that is attached to the valve body;

wherein:

the first mechanical joint facilitates rotation of the first end of the linkage arm about first and second axes, which are transverse to each other; and

the second mechanical joint facilitates rotation of the second end of the linkage arm about third and fourth axes, which are transverse to each other.

6. The burner according to claim 5 , wherein the first mechanical joint comprises:

a first hinge joint comprising a first hinge member that is configured to rotate about the first axis; and

a first knuckle joint comprising a first knuckle member that is attached to the first hinge member and defines the second axis;

wherein the first end of the linkage arm is attached to the first hinge member and the first knuckle member.

7. The burner according to claim 6 , wherein the second mechanical joint comprises:

a second hinge joint comprising a second hinge member that is configured to rotate about the third axis; and

a second knuckle joint comprising a second knuckle member that is attached to the second hinge member and defines the fourth axis;

wherein the second end of the linkage arm is attached to the second hinge member and the second knuckle member.

8. The burner according to claim 7 , wherein the second hinge joint comprises a post that is attached to the valve body, wherein the second hinge member is configured to rotate about the third axis relative to the post.

9. The burner according to claim 7 , wherein the first axis and the third axis are substantially parallel to the main axis.

10. The burner according to claim 9 , wherein the second axis and the fourth axis are substantially perpendicular to the main axis.

11. The burner according to claim 6 , wherein:

the first mechanical joint includes a first tapered bushing within a bore of the first hinge member, and a first pair of tapered buttons that engage the first tapered bushing; and

the first knuckle member extends through the bore of the first hinge member, the first tapered bushing and the first pair of tapered buttons.

12. The burner according to claim 11 , wherein the first pair of tapered buttons are pressed against the first tapered bushing using a first spring member.

13. The burner according to claim 7 , wherein:

the second mechanical joint includes a second tapered bushing within a bore of the second hinge member, and a second pair of tapered buttons that engage the second tapered bushing; and

the second knuckle member extends through the bore of the second hinge member, the second tapered bushing and the second pair of tapered buttons.

14. The burner according to claim 13 , wherein the second pair of tapered buttons are pressed against the second tapered bushing using a second spring member.

15. The burner according to claim 7 , wherein:

the first hinge joint includes a third hinge member, which has a fixed position relative to the gas flow conduit, and the first hinge member includes a cylindrical portion that extends through a bore of the third hinge member; and

the second hinge joint includes a fourth hinge member, which has a fixed position relative to the valve body, and the second hinge member includes a cylindrical portion that extends through a bore of the fourth hinge member.

16. The burner according to claim 15 , wherein:

the first hinge joint comprises:

a bushing extending within the bore of the third hinge member; and

a spring member that drives a shoulder of the first hinge member against the bushing extending within the bore of the third hinge member; and

the second hinge joint comprises:

a bushing extending within the bore of the fourth hinge member; and

a spring member that drives a shoulder of the second hinge member against the bushing extending within the bore of the fourth hinge member.

17. The burner according to claim 15 , wherein the burner comprises:

a shaft attached to the valve body;

one or more bushing supports, each having a fixed position relative to the gas flow conduit; and

one or more shaft bushings through which the shaft extends, each shaft bushing supported by one of the bushing supports and configured to maintain the shaft in general alignment with the main axis.

18. The burner according to claim 17 , wherein:

the valve body rotator is configured to decrease the amount of rotation of the valve body per unit length of movement of the valve body along the main axis relative to the valve seat as the distance the valve body is displaced from the valve seat increases; and

the valve body rotator is configured to increase the amount of rotation of the valve body per unit length of movement of the valve body along the main axis relative to the valve seat as the distance the valve body is displaced from the valve seat decreases.

19. The burner according to claim 7 , further comprising a pilot burner configured to ignite the combustible gas discharged through the outlet.

20. A method of regulating a flow of combustible gas through an outlet of conduit or a housing of a burner comprising steps of:

moving a valve body along an axis relative to a valve seat located at the outlet in response to changes in pressure at the outlet; and

rotating the valve body about the axis responsive to the moving step using a valve body rotator.