POPPET VALVE, HYDRAULIC MACHINE, AND POWER GENERATING APPARATUS OF RENEWABLE-ENERGY TYPE

摘要

A poppet valve (50) includes: a valve seat (71); a poppet (60) disposed so as to face the valve seat (71); an actuator (55) for driving the poppet (60); and a first valve casing (51) in which the actuator (55) is accommodated. The first valve casing (51) or a plate member (80) interposed between the poppet (60) and the first valve casing (51) includes a contact surface capable of partially contacting an end surface of the poppet opposite to the valve seat (71). At least one of the contact surface or the end surface of the poppet has an uneven section which forms a space between the end surface of the poppet and the plate member or the first valve casing while the end surface of the poppet is in partial contact with the contact surface. A total angular range, in the circumferential direction of the poppet, in which the space intersects with a line parallel to a radial direction and passing through a center axis of the poppet, is not less than 180 angular degrees.