ANNULAR VALVE AND POWER GENERATING APPARATUS OF RENEWABLE-ENERGY TYPE

摘要

An annular valve (50, 70) includes an annular valve seat (51) including a seat portion (52) formed by an outer circumferential edge (34a) and an inner circumferential edge (34b) of an annular opening (34), a rod (53) configured to be movable along a direction orthogonal to the seat portion (52), an annular valve body (54) disposed so as to face the annular valve seat (51) and fixed to the rod (53), and a valve-body moving unit (55) for moving the annular valve body (54) between: a valve-closed position in which the annular valve body (54) contacts the seat portion (52) of the annular valve seat (51) so that the annular opening (34) is closed by the annular valve body (54); and a valve-open position in which the annular valve body (54) is positioned away from the seat portion (52) of the annular valve seat (51) so that the annular opening (34) is open. The seat portion (52) of the annular valve seat (51) is configured to be in surface contact with the annular valve body (54) in the valve-closed position in a first annular region (52a) including the outer circumferential edge (34a) of the annular opening (34) and in a second annular region (52b) including the inner circumferential edge (34a) of the annular opening (34).