JPS57186677A - Counterbalance valve - Google Patents

Counterbalance valve

Info

Publication number
JPS57186677A
JPS57186677A JP7179981A JP7179981A JPS57186677A JP S57186677 A JPS57186677 A JP S57186677A JP 7179981 A JP7179981 A JP 7179981A JP 7179981 A JP7179981 A JP 7179981A JP S57186677 A JPS57186677 A JP S57186677A
Authority
JP
Japan
Prior art keywords
oil
pressure
port
check valve
spool
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.)
Granted
Application number
JP7179981A
Other languages
Japanese (ja)
Other versions
JPH0240912B2 (en
Inventor
Kunihiko Yoshida
Yoshizumi Nishimura
Kenichi Koshi
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 Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP7179981A priority Critical patent/JPH0240912B2/en
Publication of JPS57186677A publication Critical patent/JPS57186677A/en
Publication of JPH0240912B2 publication Critical patent/JPH0240912B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To prevent occurrence of cabitation and hinder the oil hydraulic system from hunting or reverse rotation by furnishing a check valve, by-pass, etc. at the end of a spool valve and by setting the spool valve counter-balanced. CONSTITUTION:Connection of the port 112A on the oil pressure source side with the pump will allow supply of pressure oil to the port 112A on the oil pressure source. As a result, a check valve 118A is opened and pressure oil is supplied to the port 113A on the actuator side through oil lines 117A, 116A. At the same time, the pressure oil in the port 112A on oil pressure source side is supplied also to the oil line 115A, and action of this pressure oil on the check valve 123A through oil lines 127A, 128A will permit the check valve 123A to open. This is further sent to the pilot chamber 120A through oil line 129A and shifts the spool 114 rightwise. Because the oil line 115A is in communication with a by-pass 125A through an orifice 130A, the pressure oil flows into the pilot chamber 120A also from the by-pass 125A, and the spool 114 shifts leftwise.
JP7179981A 1981-05-13 1981-05-13 KAUNTABARANSUBEN Expired - Lifetime JPH0240912B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7179981A JPH0240912B2 (en) 1981-05-13 1981-05-13 KAUNTABARANSUBEN

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7179981A JPH0240912B2 (en) 1981-05-13 1981-05-13 KAUNTABARANSUBEN

Publications (2)

Publication Number Publication Date
JPS57186677A true JPS57186677A (en) 1982-11-17
JPH0240912B2 JPH0240912B2 (en) 1990-09-13

Family

ID=13470963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7179981A Expired - Lifetime JPH0240912B2 (en) 1981-05-13 1981-05-13 KAUNTABARANSUBEN

Country Status (1)

Country Link
JP (1) JPH0240912B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6154501U (en) * 1984-09-13 1986-04-12

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6154501U (en) * 1984-09-13 1986-04-12
JPH0329649Y2 (en) * 1984-09-13 1991-06-24

Also Published As

Publication number Publication date
JPH0240912B2 (en) 1990-09-13

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