ac93ca6a_goya_Shi___Patent_applications__Description
[Patent application number] 20150107703 [Published] 04-23-2015 [Description] 
FLOW CONTROL VALVE - A flow control valve has a case defining an inlet and an outlet and a valve body capable of reciprocating in the case. The case has a measuring hole portion therein. The measuring hole portion has a plurality of projections inwardly protruding in the redial direction and a plurality of recesses outwardly depressing in the radial direction such that the projections and the recesses are alternately arranged in the circumferential direction. The valve body has a measurement shaft that has a basal end portion having larger diameter than its tip end portion. The measurement shaft of the valve body is inserted into the measuring hole portion. The measurement shaft is configured to move in the in the reciprocating direction in order to measure the flow rate of fluid flowing from the inlet to the outlet through a space between the measuring hole portion of the case and the measurement shaft.
Yamada, Nagoya-Shi - Patent applications