To replace seat disc or diaphragm loosen locknut (51) and back off adjusting screw (53), remove four bonnet screws (24) and lift off cage (3) with spring (729) and washer (61).

• 要更换阀座阀瓣或隔膜，则松开锁紧螺母(51)并退出调节螺丝(53)，拆卸四个阀盖螺丝（24）并将带着弹簧(729)和垫圈(61)的笼(3)。