Valve for a motor vehicle engine air pipe, comprising: - a shutter mounted with the ability to move between a first extreme position (P 1) and a second extreme position (P 2); - a drive motor configured to drive the shutter between the two extreme positions (P 1, P 2) by means of a drive means; - a valve body; - a drive means; - a return device configured to return the shutter to a default position (P LH) intermediate between the two extreme positions (P 1, P 2), in which the return device comprises a first return means arranged in such a way as to return the shutter from the first extreme position (P 1) to the default position (P LH) and a second return means positioned in such a way as to return the shutter from the second extreme position (P 2) to the default position (P LH), the two return means (32, 34) being different from and independent of one another and each positioned in such a way as to exert a return force directly on the drive means while the shutter is being returned to the default position (P LH), the two return means alternatively exerting their return force in such a way as to return the shutter from one of the extreme positions to the default position (P LH), the valve body and the drive means being configured in such a way that: - while the shutter is rotating towards the second extreme position (P 2): a first end of the second return means is driven by the drive means and a second end of the second return means is immobilized by the valve body whereas a first and a second end (36, 38) of the first return means are immobilized by the valve body; and - while the shutter is rotating towards the first extreme position (P 1): the first end of the first return means is immobilized by the valve body and the second end of the first return means is driven by the drive means whereas the first and second ends (40, 42) of the second return means are immobilized by the drive means, the valve comprising first and second maximum-displacement abutments (44, 46) configured to stop the rotation of the drive means when the shutter is respectively in the first extreme position (P 1) and in the second extreme position (P 2), the valve being characterized in that the valve body comprises two more abutments (48, 50) defining a default position, one of the two other stops being configured to immobilize the second end of the second return means when the shutter is turning from the default position P LH towards the second extreme position P 2, the other of the two abutments being configured to immobilize the second end of the first return means when the shutter is rotating from the default position towards the second extreme position P 2. - a shutter mounted with the ability to move between a first extreme position (P 1) and a second extreme position (P 2); - a drive motor configured to drive the shutter between the two extreme positions (P 1, P 2) by means of a drive means; - a valve body; - a drive means; - a return device configured to return the shutter to a default position (P LH) intermediate between the two extreme positions (P 1, P 2), in which the return device comprises a first return means arranged in such a way as to return the shutter from the first extreme position (P 1) to the default position (P LH) and a second return means positioned in such a way as to return the shutter from the second extreme position (P 2) to the default position (P LH), the two return means (32, 34) being different from and independent of one another and each positioned in such a way as to exert a return force directly on the drive means while the shutter is being returned to the default position (P LH), the two return means alternatively exerting their return force in such a way as to return the shutter from one of the extreme positions to the default position (P LH), the valve body and the drive means being configured in such a way that: - while the shutter is rotating towards the second extreme position (P 2): a first end of the second return means is driven by the drive means and a second end of the second return means is immobilized by the valve body whereas a first and a second end (36, 38) of the first return means are immobilized by the valve body; and - while the shutter is rotating towards the first extreme position (P 1): the first end of the first return means is immobilized by the valve body and the second end of the first return means is driven by the drive means whereas the first and second ends (40, 42) of the second return means are immobilized by the drive means, the valve comprising first and second maximum-displacement abutments (44, 46) configured to stop the rotation of the drive means when the shutter is respectively in the first extreme position (P 1) and in the second extreme position (P 2), the valve being characterized in that the valve body comprises two more abutments (48, 50) defining a default position, one of the two other stops being configured to immobilize the second end of the second return means when the shutter is turning from the default position P LH towards the second extreme position P 2, the other of the two abutments being configured to immobilize the second end of the first return means when the shutter is rotating from the default position towards the second extreme position P 2.