Annular valve and valve body for annular valve

An annular valve comprising:

• a valve seat formed in a plate-like shape;
• a plurality of passage flow channels, the passage flow channels each having an opening cross section formed in an arcuate shape and arranged on a concentric circle with the center axis of the valve seat as the center;
• a plurality of annular grooves, the annular grooves each extending over the passage flow channels located on the same concentric circle;
• a receiving plate formed in a plate-like shape, the receiving plate having a plurality of discharge flow channels and arranged to face the valve seat by way of an intermediate chamber;
• a valve body formed in an annular shape corresponding to the arcuate shape of the opening cross section of the passage flow channels, the valve body being arranged in the intermediate chamber, the valve body closing the passage flow channels by contacting the valve seat and opening the passage flow channels by separating from the valve seat;
• and
• a plurality of spring members supported by the receiving plate, the spring members each biasing elastically the valve body toward the valve seat, wherein
• a sealing surface of the valve body facing the passage flow channels is formed in a smooth convex torus shape with respect to adjacent surfaces of the valve body, and
• each of both brim portions of the annular grooves facing the sealing surface of the valve body is formed in a convex torus shape being smooth with respect to adjacent surfaces of the valve seat.

An annular valve comprising:

• a valve seat formed in a plate-like shape, the valve seat including a plurality of passage flow channels, the passage flow channels each having an opening cross section formed in an arcuate shape;
• a receiving plate formed in a plate-like shape, the receiving plate having a plurality of discharge flow channels and being arranged to face the valve seat by way of an intermediate chamber;
• a plurality of annular grooves, the annular grooves each extending over the passage flow channels located on the same concentric circle;
• a valve body formed in an annular shape corresponding to the arcuate shape of the opening cross section of the passage flow channel, the valve body being arranged in the intermediate chamber, the valve body closing the passage flow channels by contacting the valve seat and opening the passage flow channels by separating from the valve seat;
• and
• a plurality of spring members supported by the receiving plate, the spring members biasing elastically the valve body toward the valve seat, wherein
• a sealing surface of the valve body facing the passage flow channel is formed in a smooth shape with respect to adjacent surfaces of the valve body, and
• each of both brim portions of the annular grooves facing the sealing surface of the valve body is formed in a convex torus shape being smooth to adjacent surfaces of the valve seat, and when the passage flow channels are closed by the valve body, the each of both brim portions of the annular grooves linearly contacts the sealing surface of the valve body.