JPS56162289A - Overheat preventing apparatus for feed water pump - Google Patents
Overheat preventing apparatus for feed water pumpInfo
- Publication number
- JPS56162289A JPS56162289A JP6389580A JP6389580A JPS56162289A JP S56162289 A JPS56162289 A JP S56162289A JP 6389580 A JP6389580 A JP 6389580A JP 6389580 A JP6389580 A JP 6389580A JP S56162289 A JPS56162289 A JP S56162289A
- Authority
- JP
- Japan
- Prior art keywords
- overheat preventing
- discharge pressure
- preventing valve
- flow rate
- square root
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To prevent an overheat preventing valve from opening unnecessarily in low-pressure operation, by setting a minimum flow rate approximately proportional to the square root of the discharge pressure, and by opening or closing the overheat preventing valve according to said set value.
CONSTITUTION: The discharge pressure of a pump 1 is sent to a square root extracting arithmetic device 6 by means of a discharge pressure transmitter 5. The output thereof is made a set pressure approximately proportional to the square root of the discharge pressure by means of a proportional operation device 7. On the other hand, the suction flow rate is sent to a subtracter 8 by means of a suction flow rate transmitter 4, and the difference between the output set value by the proportional operation device 7 is calculated. The output of the subtracter 8 is compared with a slight allowance value for safety by means of a comparator 9. When said output is less or more than the allowance value, an overheat preventing valve 3 is opened or closed. Thus, a minimum flow rate approximately proportional to the square root of the discharge pressure is set, and the overheat preventing valve 3 is opened or closed according to said set value, in order to prevent the overheat preventing valve 3 from opening unnecessarily in low-pressure operation.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6389580A JPS56162289A (en) | 1980-05-16 | 1980-05-16 | Overheat preventing apparatus for feed water pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6389580A JPS56162289A (en) | 1980-05-16 | 1980-05-16 | Overheat preventing apparatus for feed water pump |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56162289A true JPS56162289A (en) | 1981-12-14 |
Family
ID=13242485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6389580A Pending JPS56162289A (en) | 1980-05-16 | 1980-05-16 | Overheat preventing apparatus for feed water pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56162289A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102777887A (en) * | 2012-07-24 | 2012-11-14 | 柳州高新区欧亚自动化设备有限责任公司 | Protection control device and protection control method for constant-differential-pressure electric adjusting valve for water-supply of boiler |
-
1980
- 1980-05-16 JP JP6389580A patent/JPS56162289A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102777887A (en) * | 2012-07-24 | 2012-11-14 | 柳州高新区欧亚自动化设备有限责任公司 | Protection control device and protection control method for constant-differential-pressure electric adjusting valve for water-supply of boiler |
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