Title:
ELECTRIC VALVE DEVICE
Document Type and Number:
Japanese Patent JP2019049357
Kind Code:
A
Abstract:
To enable an emergency operation in a case of earthquake and maintenance inspection work, by distinguishing cable disconnection due to maintenance inspection and cable disconnection due to earthquake.SOLUTION: Code signal transmission means 26', for transmitting either of two codes which are in operation and in maintenance inspection at a constant interval to an electric valve side in a case of disconnection with a control board 20, is provided in a control board side of an electric valve device for energizing an electric valve 21. Identification means 35 for distinguishing the two codes is provided. And a code signal is transmitted at the constant interval and cable disconnection or removal due to earthquake is detected by interruption of the signal. In the meantime, the identification means 35 identifies a received code, and if an identified code is in maintenance inspection, operation of the electric valve 21 is suspended until in operation code is identified, and safety on maintenance inspection work is assured since the electric valve 21 is not energized even if cable removal or disconnection occurs during maintenance inspection work.SELECTED DRAWING: Figure 1
Inventors:
KANETAKA HIROHARU
TANAKA JOJI
MATSUNAGA HITOSHI
TANAKA JOJI
MATSUNAGA HITOSHI
Application Number:
JP2018192387A
Publication Date:
March 28, 2019
Filing Date:
October 11, 2018
Export Citation:
Assignee:
KAWADEN KK
International Classes:
F16K35/08; F16K17/36; F16K31/04
Domestic Patent References:
| JPH0278878U | 1990-06-18 | |||
| JP2012094947A | 2012-05-17 | |||
| JP2013223351A | 2013-10-28 |
Attorney, Agent or Firm:
Patent Business Corporation Ai Patent Office