To reduce abrasion of a sealing ring 14 in a fluid control valve and to reduce a valve leakage amount after endurance.
The sealing ring 14 is in contact with an inner periphery wall 13 of a nozzle 8 in a natural state without urging force in the diameter expansion direction and seals a gap between a valve element 3 and the nozzle 8. Since the outer circumference face of the sealing ring 14 is not pressed to the inner periphery wall 13 of the nozzle 8 by an active force, abrasion of the sealing ring 14 by opening and closing movement of the valve element 3. Further, since the sealing ring 14 does not increase the diameter even when the outer circumference face is abraded, an abutment joint gap of the sealing 14 does not change even after long-term use with prescribed times or more of opening and closing movement of the valve element 3, resulting in no increase in a valve leakage amount from the abutment joint 20. Namely, the valve leakage amount after long-term use can be reduced as compared with a conventional valve.
TORII KATSUYA
NIWA YUSUKE
| JPH09158742A | 1997-06-17 | |||
| JP2009507160A | 2009-02-19 | |||
| JP2007064277A | 2007-03-15 | |||
| JPS59128966U | 1984-08-30 |
Shinji Hase