GB919714A - Hydraulic control system for a fluid actuated motor - Google Patents
Hydraulic control system for a fluid actuated motorInfo
- Publication number
- GB919714A GB919714A GB1772260A GB1772260A GB919714A GB 919714 A GB919714 A GB 919714A GB 1772260 A GB1772260 A GB 1772260A GB 1772260 A GB1772260 A GB 1772260A GB 919714 A GB919714 A GB 919714A
- Authority
- GB
- United Kingdom
- Prior art keywords
- passage
- fluid
- spool
- transfer
- circuit control
- 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
Links
- 239000012530 fluid Substances 0.000 title abstract 9
- 230000007935 neutral effect Effects 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/047—Preventing foaming, churning or cavitation
-
- 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
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/04—Arrangements for preventing erosion, not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/877—With flow control means for branched passages
- Y10T137/87829—Biased valve
- Y10T137/87837—Spring bias
- Y10T137/87845—For valve having a ball head
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
919,714. Valves; hydraulic apparatus. CESSNA AIRCRAFT CO. May 19, 1960 [June 25, 1959], No. 17722/60. Classes 69 (2) and 135. An hydraulic control system for a fluid-actuated motor 35, such as for the operation of a power shovel 45, comprises two circuit control passages 25, 26 connected to opposite ends of the motor, and a reversing spool 21 having two main operative positions in which the two circuit control passages are selectively connected to a supply passage 22, 23, including a fluid-transfer passage 27 connected to the reversing valve such that when the circuit control passage 26 is connected to the supply passage the circuit control passage 25 is connected to the transfer passage, and including a first independent valve means 42 providing fluid flow from the transfer passage into the circuit control passage 26 when the pressure in that passage falls below the pressure in the transfer passage, and when the reversing spool is in a first main operative position to connect the passage 26 with the supply passage 23 and to connect the circuit control passage 25 with the transfer passage, and second independent valve means 39 providing fluid flow from the transfer passage to a return passage when the reversing spool is in the first main operative position and when the pressure differential between the transfer passage and the return passage exceeds the pressure differential at which the first independent valve means opens. The supply passage 23 is connected via passages 17, 18 to a pump 12 and the return passage 28 connected to a reservoir 13 via pipe 30. In operation, when the shovel 45 is required to be lowered, the spool 21 is moved from the neutral position shown to the left and thereby permits fluid to flow from the supply passage 23 into the control passage 26 and then, via pipe 34, to the inner end of the ram 46. The ram then begins to drop under its own weight and, in order to prevent cavitation, the fluid on the other side of the ram is forced via pipe 33, control passage 25, transfer passage 27, ports 44 in the spool 21, and valve 42 into the control passage 26 in order to supplement the fluid being supplied by the pump. When the pressure in the latter passage increases the valve 42 is gradually closed and the pressure then developed in the transfer passage 27 opens the spring-loaded relief valve 39 so that the excess fluid is returned via passage 28 to the reservoir. To raise the shovel, the spool is moved to the right and the fluid then passes from the supply passage 22 into the passage 25 and thence to the cylinder; the fluid on the other side of the ram 46 is exhausted via passages 26, 27, 28 directly to the reservoir. Specification 918,451 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82285859 US2980136A (en) | 1959-06-25 | 1959-06-25 | Hydraulic flow control system and valve with anti-cavitation feature |
Publications (1)
Publication Number | Publication Date |
---|---|
GB919714A true GB919714A (en) | 1963-02-27 |
Family
ID=25237157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1772260A Expired GB919714A (en) | 1959-06-25 | 1960-05-19 | Hydraulic control system for a fluid actuated motor |
Country Status (3)
Country | Link |
---|---|
US (1) | US2980136A (en) |
DE (1) | DE1188886B (en) |
GB (1) | GB919714A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1600731A1 (en) * | 1966-09-06 | 1972-01-27 | Commercial Shearing | Fluid control valve |
EP0344420A1 (en) * | 1988-04-07 | 1989-12-06 | KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. | Hydraulic circuit for power shovel |
CN112879391A (en) * | 2021-02-20 | 2021-06-01 | 潍柴动力股份有限公司 | Oil supplementing device and closed system |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3049101A (en) * | 1961-04-03 | 1962-08-14 | New York Air Brake Co | Hydraulic mechanism |
US3129720A (en) * | 1961-04-07 | 1964-04-21 | Fawick Corp | Flow control valve |
BE631657A (en) * | 1962-04-30 | 1900-01-01 | ||
FR1342338A (en) * | 1962-09-29 | 1963-11-08 | Sigma | Improvements in hydraulic devices intended for reciprocating movement of high inertia elements |
DE1262088B (en) * | 1963-08-13 | 1968-02-29 | Borg Warner | Control device with a control valve and an automatic valve |
US3228306A (en) * | 1964-02-10 | 1966-01-11 | Case Co J I | Control valve |
GB1050181A (en) * | 1964-03-23 | 1900-01-01 | ||
DE1240354B (en) * | 1964-06-15 | 1967-05-11 | Hydraulic Unit Specialities Co | Control slide for double-acting hydraulic piston motors |
US3302530A (en) * | 1965-02-01 | 1967-02-07 | Berg Mfg & Sales Co | Pressurized brake cylinder using inlet pressure as a boost |
US3465788A (en) * | 1967-09-01 | 1969-09-09 | Koehring Co | Hydraulic control valve with void prevention means |
US3780623A (en) * | 1970-07-15 | 1973-12-25 | H Hohlein | Valve unit for controlling double acting fluid operating cylinders |
US3774635A (en) * | 1972-04-18 | 1973-11-27 | Sperry Rand Corp | Power transmission |
US4843949A (en) * | 1988-08-29 | 1989-07-04 | Pneumo Abex Corporation | Fluid control valve with variable pressure gain |
JPH0716943Y2 (en) * | 1989-01-27 | 1995-04-19 | 東芝機械株式会社 | Directional control valve |
US5590525A (en) * | 1993-06-01 | 1997-01-07 | Sundstrand Corporation | Method of preventing cavitation in an axial piston pump during an aiding load and system and valve employing the same |
US6116143A (en) * | 1996-07-05 | 2000-09-12 | Parker Hannifin Gmbh | Controller for a fluid cylinder |
KR101527218B1 (en) * | 2008-12-18 | 2015-06-10 | 두산인프라코어 주식회사 | Cooling apparatus for construction machinery |
JP6284469B2 (en) * | 2014-12-03 | 2018-02-28 | 株式会社クボタ | Hydraulic circuit |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2267284A (en) * | 1941-03-10 | 1941-12-23 | Livers Carlos Benjamin | By-pass valve |
US2367682A (en) * | 1943-04-09 | 1945-01-23 | Adel Prec Products Corp | Landing gear by-pass valve |
US2605108A (en) * | 1946-07-12 | 1952-07-29 | William T Stephens | Relief valve |
US2448532A (en) * | 1946-09-09 | 1948-09-07 | Hydraulic Control Engineering | Automatic power position hold for control valves |
US2608824A (en) * | 1947-08-27 | 1952-09-02 | New York Air Brake Co | Control valve |
US2646025A (en) * | 1951-02-07 | 1953-07-21 | Bendix Aviat Corp | By-pass valve for hydraulic motors |
US2745433A (en) * | 1952-02-25 | 1956-05-15 | Hydraulic Unit Specialities Co | Control valve for fluid pressure operated mechanisms |
US2873762A (en) * | 1955-06-27 | 1959-02-17 | Hydraulic Unit Specialities Co | Control valve for fluid pressure operated mechanisms |
US2856900A (en) * | 1955-11-26 | 1958-10-21 | Buehler Ag Geb | Hydraulic control means for roller mills and the like |
-
1959
- 1959-06-25 US US82285859 patent/US2980136A/en not_active Expired - Lifetime
-
1960
- 1960-05-19 GB GB1772260A patent/GB919714A/en not_active Expired
- 1960-06-22 DE DEC21737A patent/DE1188886B/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1600731A1 (en) * | 1966-09-06 | 1972-01-27 | Commercial Shearing | Fluid control valve |
EP0344420A1 (en) * | 1988-04-07 | 1989-12-06 | KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. | Hydraulic circuit for power shovel |
US5005466A (en) * | 1988-04-07 | 1991-04-09 | Kabushiki Kaisha Kobe Seiko Sho | Cavitation-preventing pilot valve control system for power shovel hydraulic circuit |
CN112879391A (en) * | 2021-02-20 | 2021-06-01 | 潍柴动力股份有限公司 | Oil supplementing device and closed system |
Also Published As
Publication number | Publication date |
---|---|
US2980136A (en) | 1961-04-18 |
DE1188886B (en) | 1965-03-11 |
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