JPS54153901A - Boiler water feeding flow-rate controlling apparatus - Google Patents

Boiler water feeding flow-rate controlling apparatus

Info

Publication number
JPS54153901A
JPS54153901A JP6223378A JP6223378A JPS54153901A JP S54153901 A JPS54153901 A JP S54153901A JP 6223378 A JP6223378 A JP 6223378A JP 6223378 A JP6223378 A JP 6223378A JP S54153901 A JPS54153901 A JP S54153901A
Authority
JP
Japan
Prior art keywords
valve
water feeding
control
relay
switching
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
JP6223378A
Other languages
Japanese (ja)
Inventor
Motoharu Kuchitsu
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 JP6223378A priority Critical patent/JPS54153901A/en
Publication of JPS54153901A publication Critical patent/JPS54153901A/en
Pending legal-status Critical Current

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  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE: To control the amount of supplied water in low loading and to perform the control of flow-rate in high loading by controlling the rotation frequency of a pump, with a valve perfectly opened which is arranged in parallel with a water feeding control valve, and to automatically carry out the switching free of the fluctuation of supplied water flow-rate.
CONSTITUTION: With the loading 50% or more, a switching relay 14 is turned a → b, and a switching relay 8 is turned c → d. The plus deviation signal which passes through a P + I calculator 9 pefectly opens a water feeding control valve 20. When the perfect opening of the water feeding valve 20 is confirmed, an electric discharge valve 21 is switched to perfect opening from perfect closing. When the load becomes 50% or less, the electic discharge valve 21 is perfectly closed. Then, the switching relay 8 is turned b → a. The minus deviation signal perfectly closes the water feeding valve 20. As the water feeding valve 20 closes gradually, the rotation frequency control loop allows the BFP exit pressure to rise to control the flow rate. When the BFP exit pressure reaches a prescribed value, a monitor relay 15 operates to switch the switching relay 8 from a to c, and the switch relay 14 from b to a. Through automatic switching operation, the amount of supplied water to a boiler can be kept constant.
COPYRIGHT: (C)1979,JPO&Japio
JP6223378A 1978-05-26 1978-05-26 Boiler water feeding flow-rate controlling apparatus Pending JPS54153901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6223378A JPS54153901A (en) 1978-05-26 1978-05-26 Boiler water feeding flow-rate controlling apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6223378A JPS54153901A (en) 1978-05-26 1978-05-26 Boiler water feeding flow-rate controlling apparatus

Publications (1)

Publication Number Publication Date
JPS54153901A true JPS54153901A (en) 1979-12-04

Family

ID=13194228

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6223378A Pending JPS54153901A (en) 1978-05-26 1978-05-26 Boiler water feeding flow-rate controlling apparatus

Country Status (1)

Country Link
JP (1) JPS54153901A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62299604A (en) * 1986-06-20 1987-12-26 株式会社東芝 Boiler feedwater controller
JPH0553968U (en) * 1991-12-25 1993-07-20 沖電気工業株式会社 High speed line printer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62299604A (en) * 1986-06-20 1987-12-26 株式会社東芝 Boiler feedwater controller
JPH0553968U (en) * 1991-12-25 1993-07-20 沖電気工業株式会社 High speed line printer

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