| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that assembling looseness causes the inclination of a discharge valve to make it impossible for a head part of the discharge valve to set a discharge hole into an adequately closed state.SOLUTION: When a discharge valve 31 is moved in such a direction that a first straight portion 55 of a head part 54 gets apart from a driving shaft while being rotated around a through-hole 23b, a side face 58a of a protruded portion 58 of a fixed part abuts on a side wall 24a of a recessed portion 24 to restrict the rotation of the discharge valve 31. Besides, when the discharge valve 31 is moved in such a direction that a second straight portion 56 of the head part 54 gets close to the driving shaft 12 while being rotated around the through-hole 23b, a side face 58b of the protruded portion 58 of the fixed part abuts on a side wall 24c of the recessed portion 24 to restrict the rotation of the discharge valve 31. |
