| 摘要 |
The blow-by gas that has flowed from a front-stage breather-chamber inlet (33) into a front-stage breather chamber (28) floats up around a preliminary valve-seat peripheral wall (22) and a preliminary breather-passage peripheral wall (24) and flows from a breather-chamber inlet (21) into a breather chamber (3). When a breather-chamber peripheral wall (12) is removed from a breather-chamber attaching seat (11), a diaphragm valve (16) is attached to the breather-chamber attaching seat (11) and has a valve face (18) seated on a preliminary valve seat (23), and a plug (27) is taken out of a preliminary breather outlet (25), from which a breather pipe (5) is led out, thereby enabling the front-stage breather chamber (28) to be used for a single-stage breather chamber provided with the diaphragm valve (16).
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