Title:
LIQUID LEVEL CONTROLLER
Document Type and Number:
Japanese Patent JPH02189606
Kind Code:
A
Abstract:
PURPOSE:To secure inflow volume close to outflow volume while always holding a liquid level at a prescribed range by controlling the opening of an electrically operated valve until the flow rate of an inflow route measured by a flow rate measuring part coincides with necessary inflow volume and continuously changing the necessary inflow volume in accordance with a change in the liquid level. CONSTITUTION:The current inflow volume of the inflow route 3 calculated by a flow rate calculating circuit 19 based upon the opening of the electrically operated valve 11 and a difference pressure measured by a difference pressure originator 14. The necessary inflow volume calculated by a flow rate setting circuit 9 is compared with the current inflow volume calculated by the circuit 19 by a PID computing circuit 20 to find out the required opening of the valve 11 and the opening is instructed to a valve control circuit 12. The circuit 12 instructed about the opening controls the required opening of the valve 11. The opening of the valve 11 is controlled until the current inflow volume of the inflow route 3 measured by the circuit 19 coincides with the necessary inflow volume and the necessary inflow volume is continuously changed in accordance with the change in the water level B, so that the water level B can be always held within the range of a center band A and the inflow volume close to the outflow volume can be secured.
Inventors:
NAMIKAWA KENJIRO
HOURAI AKINOBU
TOZAKI KAZUO
HOURAI AKINOBU
TOZAKI KAZUO
Application Number:
JP1065989A
Publication Date:
July 25, 1990
Filing Date:
January 18, 1989
Export Citation:
Assignee:
KUBOTA LTD
International Classes:
F16K31/04; G05D9/12; (IPC1-7): F16K31/04; G05D9/12
Domestic Patent References:
| JPS6022218A | 1985-02-04 |
Attorney, Agent or Firm:
Yoshihiro Morimoto