VALVE GEAR

• Main Authors: NAKANO SATORU, HANEDA CHIO, IWAMOTO NATSUKI, IWAGUCHI TAKASHI, NUMAZAKI KAZUSHI
• Format: Patent
• Language: English; Japanese
• Published: 21.11.2019
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

To provide a valve gear which can suppress the lowering of seal performance.SOLUTION: A valve gear 8 comprises: a circular disc-shaped valve seat 22 pressure-inserted into a valve seat accommodation part 14 which is formed by diameter-expanding a part of a supply flow passage 12; a plug 23 for fixing the valve seat 22 between a bottom face 14a of the valve seat accommodation part 14 and itself while compressing the valve seat in an axial direction; and a valve body 21 which can come into contact with and separate from the valve seat 22. At the bottom face 14a, a narrowing part 91 which protrudes so that an interval in the axial direction between the bottom face 14a and an opposing face 23a of the plug 23 opposing the bottom face 14a becomes narrower than that at the other position is formed at a position on an inner side of a radial direction than an internal peripheral face 14b of the valve seat accommodation part. The narrowing part 91 is formed so that the interval in the axial direction becomes the narrowest at an internal peripheral edge part 14c, and becomes linearly narrow toward the inside of the radial direction from the outside of the radial direction.SELECTED DRAWING: Figure 2 【課題】シール性の低下を抑制できる弁装置を提供する。【解決手段】弁機構８は、供給流路１２の一部を拡径してなる弁座収容部１４に圧入された円環状の弁座２２と、弁座２２を弁座収容部１４の底面１４ａとの間で軸方向に圧縮しつつ固定するプラグ２３と、弁座２２に対して接離可能な弁体２１とを備える。底面１４ａには、弁座収容部の内周面１４ｂよりも径方向内側の位置に、底面１４ａとプラグ２３における底面１４ａとの対向面２３ａとの間の軸方向間隔が他の位置よりも狭くなるように突出した狭窄部９１が形成される。狭窄部９１は、内周縁部１４ｃにおいて軸方向間隔が最も狭くなるとともに、軸方向間隔が径方向外側から径方向内側に向かって直線的に狭くなるように形成されている。【選択図】図２