JPS5747072A - Slow closing check valve - Google Patents

Slow closing check valve

Info

Publication number
JPS5747072A
JPS5747072A JP12113980A JP12113980A JPS5747072A JP S5747072 A JPS5747072 A JP S5747072A JP 12113980 A JP12113980 A JP 12113980A JP 12113980 A JP12113980 A JP 12113980A JP S5747072 A JPS5747072 A JP S5747072A
Authority
JP
Japan
Prior art keywords
valve body
opened
abnormal sound
valve
closing operation
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
JP12113980A
Other languages
Japanese (ja)
Inventor
Kohei Yamaguchi
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 JP12113980A priority Critical patent/JPS5747072A/en
Publication of JPS5747072A publication Critical patent/JPS5747072A/en
Pending legal-status Critical Current

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  • Check Valves (AREA)

Abstract

PURPOSE: To prevent generation of abnormal sound at the moment when the valve is almost closing, by releasing oil pressure of dash pot and making valve body quickly closed.
CONSTITUTION: When a pump stops suddenly, the valve body 9 closes at once, however, the valve body 8 closes slowly. At an early stage the by-pass valve 19 starts quick closing operation because all the orifices 14, 15 and 16 are opened, however, slowly down its closing speed on the way because only orifices 15 and 16 are opened. Then closing operation becomes further slower, because only orifice 16 is opened. However, when valve body 8 continues to close just before generating abnormal sound near the full closure, by-pass valve 19 is opened by a cam 21 and the valve body 8 is closed suddenly by releaving oil pressure in the dash pot 12. This arrangement eliminates the range of abnormal sound generation in the closing operation of valve body, resulting in preventing occurrence of abnormal sound.
COPYRIGHT: (C)1982,JPO&Japio
JP12113980A 1980-09-03 1980-09-03 Slow closing check valve Pending JPS5747072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12113980A JPS5747072A (en) 1980-09-03 1980-09-03 Slow closing check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12113980A JPS5747072A (en) 1980-09-03 1980-09-03 Slow closing check valve

Publications (1)

Publication Number Publication Date
JPS5747072A true JPS5747072A (en) 1982-03-17

Family

ID=14803827

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12113980A Pending JPS5747072A (en) 1980-09-03 1980-09-03 Slow closing check valve

Country Status (1)

Country Link
JP (1) JPS5747072A (en)

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