EP0396760B1 - Operation valve device - Google Patents

Operation valve device Download PDF

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Publication number
EP0396760B1
EP0396760B1 EP89909420A EP89909420A EP0396760B1 EP 0396760 B1 EP0396760 B1 EP 0396760B1 EP 89909420 A EP89909420 A EP 89909420A EP 89909420 A EP89909420 A EP 89909420A EP 0396760 B1 EP0396760 B1 EP 0396760B1
Authority
EP
European Patent Office
Prior art keywords
hole
valve
valve body
holes
port
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.)
Expired - Lifetime
Application number
EP89909420A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0396760A4 (en
EP0396760A1 (en
Inventor
Jun; Kawasaki Factory Of K.K. Komatsu Maruyama
Koji; Kawasaki Factory Of K.K. Komatsu Yamashita
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.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
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Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Publication of EP0396760A1 publication Critical patent/EP0396760A1/en
Publication of EP0396760A4 publication Critical patent/EP0396760A4/en
Application granted granted Critical
Publication of EP0396760B1 publication Critical patent/EP0396760B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member

Definitions

  • This invention relates to an operating valve device for supplying fluid under pressure into an actuator such as a hydraulic cylinder, a hydraulic motor or the like.
  • an actuator such as a hydraulic cylinder, a hydraulic motor or the like.
  • an operating valve device which includes, as shown in Fig. 1, a main spool 5 for allowing a first hole 3 and a second hole 4, respectively to selectively communicate with an inlet port 2 formed in the valve body 1, and check valves 8 and vacuum prevention valves 9 installed between the first and second holes 3 and 4, respectively, and a first outlet port 6 and a second outlet port 7 connectable with the first and second holes 3 and 4, respectively, the arrangement being made such that when the main spool 5 is moved to the left or to the right in Fig.
  • the inlet port 2 is connected either with the first outlet port 6 or with the second outlet port 7 so as to selectively supply fluid under pressure from a pressurized fluid supply source P into either one of a first chamber B1 or a second chamber B2 of an actuator B, and also a backward flow of fluid under pressure from the first and second chambers 6, 7 into the inlet port 2 can be prevented by the check valves 8, and also fluid under pressure can be drawn by the vacuum prevention valve 9 from a tank port 10 into the first chamber B1 or the second chamber B2 thereby preventing formation of a vacuum therein or depressurization.
  • the actuator B is moved by a pressure loading F at a speed higher than the value corresponding to the amount of fluid under pressure supplied by the pressurized fluid supply source P.
  • the chamber on the side of the actuator into which fluid is to be supplied will form a vacuum, and therefore the vacuum prevention valve 9 is then opened to allow the tank port 10 to communicate either with the first outlet port 6 or with the second outlet port 7 so as to draw in fluid under pressure from the fluid tank 11 thereby preventing formation of a vacuum in the chamber.
  • vacuum prevention valves 9 are installed on the side of the outlet ports, in case the valve seat is worn away or foreign matters made ingress therein, fluid under pressure will flow from the tank port 10 into the fluid tank 11 thus increasing fluid leakage and causing such difficulties as failure in holding the actuator B in locked condition or operational delay, etc.
  • the present invention has been made in view of the above-mentioned circumstances in the prior art, and has for its object to provide an operating valve device wherein the space occupied by its constitutional element is reduced thereby making the whole valve device compact, and leakage of fluid from vacuum prevention valves can be reduced substantially.
  • an operating valve device having an inlet port formed in the valve body so as to communicate with a pressurized fluid supply source, a first outlet port and a second outlet port formed in the valve body so as to communicate with pressure chambers, respectively, defined on both sides of an actuator, a first hole and a second hole formed in the valve body at positions on both sides of the inlet port so as to allow the inlet port to communicate with the first and second outlet ports, respectively, and a tank port formed in the valve body between the first and second holes and communicating with a fluid tank, characterized in that it comprises a first communication hole and a second communication hole formed coaxially and in opposed relationship with each other so as to allow the first and second holes, respectively, to communicate with the tank port; a first valve hole and a second valve hole formed coaxially in the valve body outside and in succession with these communication holes, respectively; a pair of support shafts inserted in these valve holes, respectively, in opposed relationship with each other
  • an operating valve device comprising: an inlet port formed in the valve body so as to extend from one end face thereof to a substantially intermediate position in a direction substantially at right angles to the one end face and communicating with a pressurized fluid supply source; a first hole and a second hole formed in the valve body on both sides of the inlet port and in substantially parallel relationship with each other; a valve hole formed in the valve body at right angles to the first and second holes and the inlet port so as to allow the first and second holes, respectively, the communicate with the inlet port; a main spool slidably mounted in the valve hole so as to allow either the first hole or the second hole to selectively communicate with the inlet port; a tank port formed in the valve body so as to extend from the other end face thereof to a substantially intermediate position in a direction at right angles to the other end face and communicating with a fluid tank; a first outlet port and a second outlet port formed in the valve body on both
  • the distance between the inlet port 2 and the outlet ports 6 and 7 is short so that the size of the valve body 1 can be made small and the whole operating valve device can be made compact, and also since each of the check valves and vacuum prevention valves can be moved independently, thus enhancing the operational reliability of the operating valve.
  • check valve body 17 and the vacuum prevention valve body 20 are mounted coaxially and their valve seats are also mounted coaxially. This implies that there are double seats against leakage of fluid on the side of each outlet port, thereby reducing the amount of leadkage of fluid, and even if foreign matters made ingress into one of the check valve and the vacuum prevention valve, sealing by the other can be achieved thus enhancing the reliability thereof on leakage prevention against ingress of foreign matters.
  • Fig. 2 is a schematic, sectional view showing an embodiment of the operating valve device according to the present invention, where the same component parts as those of the aforementioned embodiment (shown in Fig. 1) are denoted with the same reference numerals and characters, and therefore description of them is omitted herein.
  • a port 10 connected to a fliuid tank is allowed to communicate through coaxial first and second communication holes 12 and 13, which are formed in an intermediate portion interposed between a first port 3 and a second port 4 perforated in a valve body 1 in substantially parallel relationship with each other, with the first and second holes 3 and 4.
  • the valve body 1 has a first outlet port 6 and a second outlet port which are formed therein so as to extend from one end thereof and substantially opposite to the first and second holes 3 and 4, respectively, and which are connected to pressure chambers B1 and B, respectively, of an actuator B.
  • valve body 1 has a first valve hole 14 and a second valve hole 15 formed therein outside the first and second outlet ports 6 and 7, respectively, and coaxially with the first and second communication holes 12 and 13, respectively.
  • Support shafts 16, 16 are inserted in the first and second valve holes 14 and 15, respectively.
  • Base portions 16a, 16a of the support shafts 16, 16 are fixedly secured so as to be tightly fitted in the first and second valve holes 14 and 15, respectively, so that the leading end portions 16b, 16b of the support shafts 16, 16 extending into the first and second commnication holes 12 and 13, respectively, may be located in opposed relationship with each other.
  • a cylindrical check valve body 17 is slidably mounted on an axial intermediate portion 16c of each of the support shafts 16, and the valve body 17 is biased by a spring 18 so as to make pressure contact with a check valve seat 19 thereby forming a check valve 8.
  • a vacuum prevention valve body 20 is slidably mounted on the leading end portion 16b of each of the support shafts 16 so as to prevent either one of the pressure chambers B1 or B2 defined or both sides of the piston of the actuator B from forming a vacuum, and the valve body 20 is biased by a spring 21 so as to make pressure contact with a vacuum prevention valve seat 22, thus forming a vacuum prevention valve 9.
  • the check valve body 17 is urged by the loading pressure so as to make pressure contact with the check valve seat 19 so that a backward flow of fluid under pressure into a pressurized fluid supply source p can be prevented.
  • the check valve body 17 and the vacuum prevention valve body 20 are moved against the resilient forces of the springs 18 and 21, respectively, so as to communicate the tank port 10 either with the first outlet port 6 or with the second outlet port 7 to draw in pressurized fluid from a fluid tank 11 thereby preventing formation of a vacuum in the chamber B1 or B2.
  • the check valve body 7 and the vacuum prevention valve body 20 are slidably mounted coaxially on the support shaft 16, the distance between the inlet port 2 and the outlet ports 6 and 7 can be reduced so that the size of the valve body 1 can be reduced thus making the whole of the valve device compact, and since movements of the check valve body 17 and the vacuum prevention valve body 20 occurs independently, the operational reliability of the operating valve device is enhanced.
  • check valves 8 are located in the outlet ports 6 and 7, respectively, leakage of fluid under pressure from the actuator B can be prevented substantially, and since double sealing is provided by combinations of valve bodies 17 and 20 of the check valve 8 and the vacuum prevention valve 9 with valve seats 19 and 22, respectively, if leakage of fluid occurs in one of the combinations due to foreign matters prevent therein, then fluid leakage can be prevented by the other combination thereby enhancing the reliability on fluid leakage prevention.
  • main spool 5 is held at its neutral position by a pair of springs 5a, 5a and can be slidably moved to the left or to the light by aupplying pilot fluid under pressure into one of pressure chambers 5b, 5b.
  • Fig. 3 shows an example of application using the embodiment of the operating valve device shown in Fig. 2.
  • the arrangement is made such that each of the first and second outlet ports 6, 7 associated with the first and second holes 3, 4, respectively, is controlled through a two-position, two-direction control valve 30 to be connected with or disconnected from a fluid tank 11.
  • Each of the two-position, two-direction control valves 30 is normally held by a spring 31 at its disconnecting position I and changed over to its connecting position II when pilot fluid under pressure is supplied into its pressure chamber 30a so that the pressurized fluid discharged by a pilot pump P1 may be supplied through a first pilot valve 32 and a second pilot valve 33, respectively, into the above-mentioned pressure chambers 5a and 30a, respectively.
  • pilot fluid under pressure is supplied into one of the pressure chambers 56 of the main spool 5 and the pressure chamber 30a of one of the two position, two-direction control valves 30, respectively, so that the main spool 5 may assume its first position III where the inlet port 2 is allowed to communicate with the second hole 4, and also the two-position, two-direction control valve 30 may assume its connecting position II.
  • the fluid under pressure discharged by the pressurized fluid supply source P is supplied from the inlet port 2 into the second chamber B2 of the actuator B through the second hole 4 and the second outlet port 7, whilst the pressurized fluid in the first chamber B1 will flow into the fluid tank 11 through the first outlet port 6 and the two-position, two-direction control valve 30.
  • the pressure loading F applied to the actuator B exceeds the value of actuator thrust F based on the pressure P0 decided by the setting pressure of a main relief valve 35, then there is a risk of the fluid under pressure in the second chamber B2 flowing back into the pressurized fluid supply source P through the second hole 4 and damaging the fluid supply source P.
  • the check valve 8 installed in the second hole 4 will prevent fluid under pressure from flowing back into the pressurized fluid supply source P and damaging it.
  • the actuator B is moved by a pressure loading at a speed higher than the value corresponding to the amount of fluid under pressure supplied by the pressurized fluid supply source P, then the second chamber B2 will form a vacuum.
  • the fluid under pressure in the fluid tank 11 is drawn through a vacuum prevention valve 9 into the second chamber B2 so as to reflenish the latter fluid thereby preventing formation of a vacuum therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)
  • Actuator (AREA)
  • Check Valves (AREA)
EP89909420A 1988-08-16 1989-08-16 Operation valve device Expired - Lifetime EP0396760B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP63202747A JP2559619B2 (ja) 1988-08-16 1988-08-16 操作弁装置
JP202747/88 1988-08-16
PCT/JP1989/000834 WO1990002266A1 (en) 1988-08-16 1989-08-16 Operation valve device

Publications (3)

Publication Number Publication Date
EP0396760A1 EP0396760A1 (en) 1990-11-14
EP0396760A4 EP0396760A4 (en) 1991-01-23
EP0396760B1 true EP0396760B1 (en) 1994-07-20

Family

ID=16462493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89909420A Expired - Lifetime EP0396760B1 (en) 1988-08-16 1989-08-16 Operation valve device

Country Status (5)

Country Link
EP (1) EP0396760B1 (ja)
JP (1) JP2559619B2 (ja)
KR (1) KR970001463B1 (ja)
DE (1) DE68916946T2 (ja)
WO (1) WO1990002266A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06193750A (ja) * 1992-12-22 1994-07-15 Komatsu Ltd 油圧バルブ装置
DE19548943B4 (de) * 1995-12-28 2005-05-04 Bosch Rexroth Ag Ventilanordnung
CN110159605B (zh) * 2019-05-31 2024-03-15 东莞市鸿诺自动化科技有限公司 一种真空及吹气组合阀

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216446A (en) * 1963-02-05 1965-11-09 Parker Hannifin Corp Spool valve assembly with dual check valve assembly
US3390700A (en) * 1965-04-26 1968-07-02 Commercial Shearing Control valves
US3506031A (en) * 1967-10-06 1970-04-14 Parker Hannifin Corp Relief-makeup check assembly for directional control valves
US3460567A (en) * 1967-10-23 1969-08-12 Parker Hannifin Corp Relief-makeup check assembly for directional control valves
SE328778B (ja) * 1968-07-11 1970-09-21 Monsun Tison Ab
US3779133A (en) * 1972-06-21 1973-12-18 Caterpillar Tractor Co Make-up valve for hydraulic control circuit
JPS5621657U (ja) * 1979-07-27 1981-02-26
US4338962A (en) * 1980-08-13 1982-07-13 Commercial Shearing, Inc. Control and relief valves

Also Published As

Publication number Publication date
JP2559619B2 (ja) 1996-12-04
KR900702240A (ko) 1990-12-06
DE68916946T2 (de) 1995-01-05
WO1990002266A1 (en) 1990-03-08
DE68916946D1 (de) 1994-08-25
EP0396760A4 (en) 1991-01-23
KR970001463B1 (ko) 1997-02-06
EP0396760A1 (en) 1990-11-14
JPH0251602A (ja) 1990-02-21

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