| 摘要 |
PURPOSE:To prevent the removal of a seat by deforming a resilient seat flexibly and fitting in an enlarging groove formed in the inner-circumference of a valve box while inserting a molded core member for stopping the removal of said seat into the inner space of said seat. CONSTITUTION:A resilient seat 10 is deformed flexibly and fitted in an enlarged groove 9 formed in the inner-circumferential face of a valve box 1, while a core member 11 having circular cross-section is inserted into the space formed by the recess (a) and the bottom face of the groove while utilizing a valve rod insertion hole. Then said seat 10 is pressed against the facing recess of said seat 10 thus to prevent the removal of the resilient seat 10 from said groove 9. |
