JPS5563069A - Pilot check valve for low cracking pressure - Google Patents

Pilot check valve for low cracking pressure

Info

Publication number
JPS5563069A
JPS5563069A JP13719578A JP13719578A JPS5563069A JP S5563069 A JPS5563069 A JP S5563069A JP 13719578 A JP13719578 A JP 13719578A JP 13719578 A JP13719578 A JP 13719578A JP S5563069 A JPS5563069 A JP S5563069A
Authority
JP
Japan
Prior art keywords
valve
oil
pressure
check valve
chamber
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
JP13719578A
Other languages
Japanese (ja)
Inventor
Isao Tojo
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.)
Tadano Ltd
Original Assignee
Tadano Iron Works Co 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 Tadano Iron Works Co Ltd filed Critical Tadano Iron Works Co Ltd
Priority to JP13719578A priority Critical patent/JPS5563069A/en
Publication of JPS5563069A publication Critical patent/JPS5563069A/en
Pending legal-status Critical Current

Links

Landscapes

  • Check Valves (AREA)
  • Safety Valves (AREA)

Abstract

PURPOSE: To open the pilot check valve by very low pilot pressure by communicating the backpressure chamber of the pressure receiving side of the valve to two oil chambers, which are cut off from each other by the valve, with a low pressure communicating valve.
CONSTITUTION: The oil chambers A, B of the pilot check valve are cut off from each other by setting the valve to the valve seat 1 while the oil pressure actuator is stopped. In this state, since pressure of the oil chamber B is higher than that of the oil chamber A, the low pressure communicating valve 8 communicates the backpressure chamber 6 to the oil chamber A. When the operation valve D is changed and pressurized oil is supplied to the oil passage F to drive the actuator C in the forward direction, a part of the oil is fed to the opening means 5. By this, the valve 4 is opened, exhaust oil is led to the oil passage E. At this time, when the pressure received area S in the seated valve is equal to that S' of pressure received part 7, only a small pilot pressure against the spring 3 is sufficient to open the check valve.
COPYRIGHT: (C)1980,JPO&Japio
JP13719578A 1978-11-06 1978-11-06 Pilot check valve for low cracking pressure Pending JPS5563069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13719578A JPS5563069A (en) 1978-11-06 1978-11-06 Pilot check valve for low cracking pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13719578A JPS5563069A (en) 1978-11-06 1978-11-06 Pilot check valve for low cracking pressure

Publications (1)

Publication Number Publication Date
JPS5563069A true JPS5563069A (en) 1980-05-12

Family

ID=15193011

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13719578A Pending JPS5563069A (en) 1978-11-06 1978-11-06 Pilot check valve for low cracking pressure

Country Status (1)

Country Link
JP (1) JPS5563069A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165081A (en) * 1985-01-16 1986-07-25 Chiyoda Seiki:Kk Relief valve
JPH031369U (en) * 1989-05-30 1991-01-09

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5236254U (en) * 1975-09-05 1977-03-15

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5236254U (en) * 1975-09-05 1977-03-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165081A (en) * 1985-01-16 1986-07-25 Chiyoda Seiki:Kk Relief valve
JPH031369U (en) * 1989-05-30 1991-01-09

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