Exhaust line valve with facilitated coupling between the actuator and the flap, and method of assembling such a valve

A valve for a motor vehicle exhaust line comprising:

• a tubular valve body defining a passage;
• a flap mounted to pivot relative to the valve body about a pivot axis between a closed position and an open position of the passage;
• an actuator causing movement of the flap between the closed and open positions;
• and
• a coupling device that couples the flap to the actuator, wherein the coupling device comprises:
• a compression spring having a proximal end that is fixed in rotation about the pivot axis with a first element chosen between the flap and an output shaft of the actuator, and a distal end,
• a seat that is engaged with the distal end of the compression spring, wherein the seat is fixed in rotation about the pivot axis with a second element chosen between the flap and the output shaft of the actuator, and
• a transmission member that is torsionally-rigid and fixed in rotation about the pivot axis with the first element, and that is designed to immobilize the distal end of the compression spring relative to the proximal end in a plane that is orthogonal to the pivot axis, the transmission member having at least one support branch that is off-center and extends at least partly parallel to the pivot axis,
• wherein the compression spring is torsionally constrained about the pivot axis by the transmission member to exert on the distal end of the compression spring a holding torque that holds the distal end against the at least one, or each, support branch.