Backflow prevention assembly with a linkage

1. A check valve for a backflow prevention assembly, comprising:

a flexible linkage with platform having a proximal end and a distal end;

a first coupling member supported by the platform for engaging a spring retention assembly, the first coupling member centrally located above the platform by a strut;

a stop protruding from the proximal end of the platform to engage a portion of the check valve for limiting travel of the platform;

a branch depending from the proximal end of the platform, the branch having a hinge pin configured to nest in a slot defined by the check valve; and

a second coupling member depending from the distal end of the platform for engaging a valve member.

2. The check valve of claim 1 , wherein the branch forms an alcove, a periphery of the valve member fitting in the alcove.

3. The check valve of claim 2 , wherein the hinge pin, alcove, first coupling member, and second coupling member allow self-alignment of the valve member relative to a valve opening.

4. The check valve of claim 1 , wherein the hinge pin, first coupling member, and second coupling member form a triangle to increase a mechanical advantage to help fully open the valve member.

5. The check valve of claim 1 , wherein the stop is one or more wing appendages.

6. The check valve of claim 1 , wherein the branch, hinge pin, first coupling member, and second coupling member of the check valve allow for tool less and fastener-less drop-in assembly into a housing of the backflow prevention assembly.

7. A check valve for a backflow prevention assembly, comprising:

a flexible linkage with a platform having a proximal end and a distal end, the platform having one or more struts extending therefrom;

a first coupling member supported by the platform for engaging a bias assembly;

a branch depending from the proximal end of the platform, the branch having a hinge pin configured to nest in a slot defined by the check valve; and

a second coupling member depending from the distal end of the platform for engaging a valve member,

wherein:

a first axis from the binge pin to the first coupling member and a second axis from the hinge pin to the second coupling member form a strut angle that increases a mechanical advantage for fully opening the valve member to decrease pressure drop across the check valve, a height of the one or more struts of the platform determining the strut angle.

8. The check valve of claim 7 , further comprising a stop protruding from the proximal end of the platform to engage a portion of the check valve for limiting travel of the platform.

9. A backflow prevention assembly comprising;

a valve member having a first side and a second side, the first side having a receiving member, and the second side forming a sealing region;

a check valve including:

a flexible linkage having a proximal end and a distal end defining a plane;

a first coupling member supported by the flexible linkage;

one or more struts extending from the flexible linkage to support the first coupling member;

a branch depending from the proximal end of the flexible linkage, the branch having a hinge pin configured to nest in a slot defined by a frame of the check valve, the branch having an arm forming an alcove;

a stop protruding from the proximal end of the flexible linkage to engage the frame of the check valve for limiting travel of the flexible linkage; and

a second coupling member depending from the distal end of the flexible linkage for engaging the receiving member; and

a bias assembly engaged with the first coupling member,

wherein:

the arm loosely supports the valve member in the alcove and the receiving member of the valve member captures the second coupling member to allow for rotational movement therein to self-align to a valve opening, and

a first axis from the hinge pin to the first coupling member and a second axis from the hinge pin to the second coupling member form a strut angle that increases a mechanical advantage for fully opening the valve member to decrease pressure drop across the check valve.

10. The backflow prevention assembly of claim 9 , wherein the second coupling member and the receiving member are a ball and socket respectively.

11. The backflow prevention assembly of claim 9 , wherein the hinge pin, the slot, the first coupling member and the bias assembly, the second coupling member and the receiving member, and the alcove all allow the valve member to self-align to a valve opening.

12. The backflow prevention assembly of claim 9 , further comprising a second valve member, a second check valve, and a second bias assembly located within the backflow prevention assembly.