JPS57179476A - Change-over valve - Google Patents

Change-over valve

Info

Publication number
JPS57179476A
JPS57179476A JP56063901A JP6390181A JPS57179476A JP S57179476 A JPS57179476 A JP S57179476A JP 56063901 A JP56063901 A JP 56063901A JP 6390181 A JP6390181 A JP 6390181A JP S57179476 A JPS57179476 A JP S57179476A
Authority
JP
Japan
Prior art keywords
valve
main valve
communicating hole
pressure
forcibly
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
JP56063901A
Other languages
Japanese (ja)
Inventor
Katsuichi Sato
Kikuji Takahashi
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 JP56063901A priority Critical patent/JPS57179476A/en
Publication of JPS57179476A publication Critical patent/JPS57179476A/en
Pending 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
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/04—Devices for relieving the pressure on the sealing faces for sliding valves

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multiple-Way Valves (AREA)

Abstract

PURPOSE:To permit pressure in the interior and exterior of a main valve to be balanced with each other forcibly to improve operation factor by providing a communicating hole in the main valve to which is connected an auxiliary valve for opening and closing this communicating hole and which is operated by connecting the auxiliary valve to a drive source. CONSTITUTION:When difference of pressure between the interior and exterior of a main valve 28 is 15-20kg/cm<2> and current is supplied to a coil 36, an auxiliary valve 29 is pivoted about a fulcrum 29b counterclockwise to open a communicating hole 28a in the main valve 28 for achieving forcibly pressure balance. When current to the coil 36 is stopped, the auxiliary valve 29 is pivoted clockwise about the fulcrum 29b to open the communicating hole 28a in the main valve 28. Thus, high pressure and low one communicate to each other to achieve forcibly pressure balance, and thereafter the main valve 28 is pivoted about a pivot 28b by the action of a tension spring 30 until the communicating hole 28a is closed, so that a return valve is changed over.
JP56063901A 1981-04-30 1981-04-30 Change-over valve Pending JPS57179476A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56063901A JPS57179476A (en) 1981-04-30 1981-04-30 Change-over valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56063901A JPS57179476A (en) 1981-04-30 1981-04-30 Change-over valve

Publications (1)

Publication Number Publication Date
JPS57179476A true JPS57179476A (en) 1982-11-05

Family

ID=13242675

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56063901A Pending JPS57179476A (en) 1981-04-30 1981-04-30 Change-over valve

Country Status (1)

Country Link
JP (1) JPS57179476A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61175378A (en) * 1985-01-31 1986-08-07 Toshiba Corp Four-way valve apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5228813U (en) * 1975-08-20 1977-02-28
JPS5326533B2 (en) * 1972-04-03 1978-08-02

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5326533B2 (en) * 1972-04-03 1978-08-02
JPS5228813U (en) * 1975-08-20 1977-02-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61175378A (en) * 1985-01-31 1986-08-07 Toshiba Corp Four-way valve apparatus
JPH0254465B2 (en) * 1985-01-31 1990-11-21 Tokyo Shibaura Electric Co

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