| 摘要 |
PURPOSE:To prevent each resin coat material from exforliating by fluid sealing, by screwing a seat ring provided in a valve seal and simultaneously compressing each end part of each resin coat material applied to an internal and an external surface of a valve main structure through a flange part and an end surface of the seat ring. CONSTITUTION:A valve main structure 1, in a condition that it is coated with a resin coat material 13, 14, forms a threaded part 27 for a seat ring 3 to be worked, screwing the seat ring 3 having a flange prt 4. Here the valve main structure 1, holding an end part 21 of the resin coat material 13 between the flange part 4 and the valve main structure 1, screws the seat ring 3 till the fluid sealing surface pressure is generated by further providing a compression margin in the end part 21. While an end surface 5 in an opposite side to the flange part 4 of the seat ring 3 is formed in construction that the end surface 5 presses an end part 24 in the curved part of the resin coat material 14. In this way, the valve main structure 1, simultaneously compressing each end part 21, 24 of each resin coat material 13, 14 by screwing the seat ring 3, ensures the surface pressure sealing the pressure of fluid. |
