Abstract: A thermopulse apparatus for deburring parts has a hollow body (1) housing a working chamber (2) in such a manner as to define a space (7) between the outer walls (6) thereof and inner walls (4) of the body (1) for liquid (8) partly filling the space. The chamber (2) has spark plugs (9), an inlet valve (20), an exhaust valve (12) mounted in the bottom part of the chamber (2) along the longitudinal axis (16) thereof under the layer of liquid (8), and a covermember (13) for accommodation of the parts (14) being treated, the convermember being reciprocatable within the chamber (2). Ports (23 and 32) respectively are provided in the side walls (22) of the valve (12) and in the covermember (13) on the side of the valve (12).