| 摘要 |
PURPOSE:To obtain a highly reliable testing apparatus, by switching the valve- opening control mode from pressure control to valve-opening control on the basis of pressure in fluid passage. CONSTITUTION:Valve-opening instructing section C processes, in its pressure control section B, electric signals from pressure setting section A including means 1 for setting pressure in fluid passage, and affords a valve-opening instruction signal to a valve-opening controlling circuit adapted for driving fluid valve 16. Stroke controlling and instructing section H processes electric signals from a valve-opening setting section and affords a valve-opening instruction signal to valve-opening control section D. On the other hand, limiter circuit section E processes signals from valve- opening detector 15 for detecting the opening of fluid valve 16 and output signals from the valve-opening setting section and switches the control mode for the valve- opening instructing signal afforded to the valve-opening control section from pressure control to valve-opening control when the valve opening becomes higher than a reference value. |
