| 摘要 |
In a control valve, which controls a flow of a fluid which passes therethrough by a drive unit (4) operating and a valve (34) opening in a prescribed location on the basis of an operation output signal from a controller (6), surface temperature detection means (30, 32) are respectively disposed which detect a surface temperature of a primary side and a secondary side of the valve (34). Also disposed in the control valve are: an opening-Cv value storage unit which pre-stores a relation between an opening of the valve (34) and a Cv value; a surface temperature-pressure storage unit which pre-stores a relation between surface temperature and pressure; and a computation unit which derives a Cv value from the stored relation on the basis of the valve opening corresponding to the operation output signal which the controller outputs, derives a pressure value from the stored relation on the basis of the surface temperature which the surface temperature detection means (30, 32) have detected, and computes a flow which passes through the valve (34) from the derived Cv value and pressure value. |
