Title:
CONTROL POSITIONER
Document Type and Number:
Japanese Patent JP3294383
Kind Code:
B2
Abstract:
PURPOSE: To secure the closing performance of a control valve, etc., by the mechanical and structural improvement of a positioner and with no dependence on the adjustment of the positioner span.
CONSTITUTION: The opening degree of a control valve 4 consisting of a valve main body 1 and a valve seat 2 is controlled by a driving spring 4 and a driving diaphragm 5 via a driving shaft 3 attached to the body 1. Then the operating air pressure is controlled to the diaphragm 5 by the input signal pressure and with the control position of the shaft 3 defined as a detecting end. A positioner is provided with a transmission lever 8 which rotates following the shift of the control position of the shaft 3, an input diaphragm 10 which is connected to the lever 8 via a feedback spring 9 and also receives the supply of the signal air pressure, and a means which controls the air pressure of the diaphragm 5 by the spring 9 and the diaphragm 10. Then the rotation of the lever 8 is controlled by a limiter 20.
Inventors:
Shigekazu Nishiyama
Application Number:
JP15816893A
Publication Date:
June 24, 2002
Filing Date:
June 04, 1993
Export Citation:
Assignee:
ABB Co., Ltd.
International Classes:
G05D16/06; F15B9/08; (IPC1-7): G05D16/06; F15B9/08
Domestic Patent References:
| JP6425502U | ||||
| JP6438303U |
Attorney, Agent or Firm:
Kazuhiko Hirose
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