Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shinichi Yokoyama0
Ryo Sano0
Naohito Seko0
Yuuji Nakano0
Yoshiaki Yamamoto0
Date of Patent
March 21, 2023
0Patent Application Number
173450820
Date Filed
June 11, 2021
0Patent Citations
Patent Primary Examiner
A valve device includes: a ball valve having a ball face shaped in a convex spherical surface; and a valve seat having a seat face shaped in a concave spherical surface. The seat face is pressed onto the ball face. The ball valve is rotated to open a valve by communicating a valve opening defined in the ball valve and a seat opening defined in the valve seat with each other, and to close the valve by stop the communication. A diameter of the seat opening Φ
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