Joy valve gear is a type of steam locomotive valve gear, designed by David Joy (1825–1903), Locomotive and Marine engineer, and patented in 1870. The movement is derived from a vertical link connected to the connecting rod. The vertical movement is translated into the horizontal movement required by the valve spindle by a die block moving in a slide which can be varied in inclination. The necessary 90 degree phase shift is obtained not from an eccentric, as with most designs, but from the 90 degree phase difference between the horizontal and vertical components of the motion of the connecting rod.
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