JPS54105301A - Pump operation control device - Google Patents

Pump operation control device

Info

Publication number
JPS54105301A
JPS54105301A JP1144978A JP1144978A JPS54105301A JP S54105301 A JPS54105301 A JP S54105301A JP 1144978 A JP1144978 A JP 1144978A JP 1144978 A JP1144978 A JP 1144978A JP S54105301 A JPS54105301 A JP S54105301A
Authority
JP
Japan
Prior art keywords
pumps
ejection
valves
choking
certain degree
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
Application number
JP1144978A
Other languages
Japanese (ja)
Inventor
Haruo Kawai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1144978A priority Critical patent/JPS54105301A/en
Publication of JPS54105301A publication Critical patent/JPS54105301A/en
Pending legal-status Critical Current

Links

Landscapes

  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE: To prevent cavitation and make it possible to continue operation by choking the ejection valves of the remaining pumps, while in conventional systems the abnormal stop of operation of one or several pumps stop the operation of the remaining pump and disrupt water supply, by choking the ejection valves of the remaining pumps in operaton.
CONSTITUTION: In case one or several pumps of a plurality of pumps 1 connected in parallel stopped abnormally, the ejection pressure of other pumps in operation is raised by choking their ejection valves 2 to a certain degree of opening and their operation point is prevented from entering the cavitation range. That is, when contact point 86 is closed by an abnormal signal, the coil of closing-purpose electromagnetic contactor 88L is energized and ejection valves 2 are driven to the closing side. When the valves reach a certain degree of opening, intermediate limit switch 33N operates and the circuit is closed. Then the action of the coil of 88L is checked and ejection valves 2 are maintained at a certain degree of opening. By this, the ejection pressure is raised and pumps 1 are prevented from entering the cavitating range and thereby continue opeation.
COPYRIGHT: (C)1979,JPO&Japio
JP1144978A 1978-02-06 1978-02-06 Pump operation control device Pending JPS54105301A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1144978A JPS54105301A (en) 1978-02-06 1978-02-06 Pump operation control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1144978A JPS54105301A (en) 1978-02-06 1978-02-06 Pump operation control device

Publications (1)

Publication Number Publication Date
JPS54105301A true JPS54105301A (en) 1979-08-18

Family

ID=11778394

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1144978A Pending JPS54105301A (en) 1978-02-06 1978-02-06 Pump operation control device

Country Status (1)

Country Link
JP (1) JPS54105301A (en)

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