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1. (WO2016056535) SEAT RING FOR BUTTERFLY VALVE, STRUCTURE FOR FIXING SAME, AND ECCENTRIC BUTTERFLY VALVE

Pub. No.:    WO/2016/056535    International Application No.:    PCT/JP2015/078298
Publication Date: Fri Apr 15 01:59:59 CEST 2016 International Filing Date: Wed Oct 07 01:59:59 CEST 2015
IPC: F16K 1/226
F16K 1/42
Applicants: KITZ CORPORATION
株式会社キッツ
Inventors: MIYASHITA, Yukihiro
宮下 幸博
SAKYU, Kazunori
佐久 一典
Title: SEAT RING FOR BUTTERFLY VALVE, STRUCTURE FOR FIXING SAME, AND ECCENTRIC BUTTERFLY VALVE
Abstract:
 Provided are: a seat ring for a butterfly valve in which an appropriate sealing surface pressure is sustained between the seat ring and a valve body while the structure is simplified, thereby improving durability and maintaining exceptional operability, making it possible to sustain the sealing surface pressure and produce a high sealing performance irrespective of whether the pressure is a positive pressure or a counter pressure, and making it possible to reliably seal reverse leakage; a structure for fixing the seat ring; and an eccentric butterfly valve. A seal ring for a butterfly valve in which: a flexible part 31 having a prescribed wall thickness is integrally provided on one inner-diameter-side surface of a ring-shaped base part 30 having a substantially rectangular cross-section, and a fixation part 32 is integrally provided on one outer-diameter-side surface of the base part 30; a concave space part 40 is provided between the outer peripheral surface 36 of the flexible part 31 and the inner peripheral surface 37 of the fixation part 32; a seal contact part 35 protrudes at an inner-diameter position of the flexible part 31; and the seal contact part 35 is positioned closer to the inner peripheral surface of the flexible part 31 than is a depth-side position 42 of the space part 40.