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GB1078139A - Improvements in or relating to hydraulic control apparatus - Google Patents

Improvements in or relating to hydraulic control apparatus

Info

Publication number
GB1078139A
GB1078139A GB4378464A GB4378464A GB1078139A GB 1078139 A GB1078139 A GB 1078139A GB 4378464 A GB4378464 A GB 4378464A GB 4378464 A GB4378464 A GB 4378464A GB 1078139 A GB1078139 A GB 1078139A
Authority
GB
United Kingdom
Prior art keywords
line
spool
piston
spring
valve
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
Application number
GB4378464A
Inventor
Cyril William Tridgell
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.)
Power Jacks Ltd
Original Assignee
Power Jacks 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 Power Jacks Ltd filed Critical Power Jacks Ltd
Priority to GB4378464A priority Critical patent/GB1078139A/en
Publication of GB1078139A publication Critical patent/GB1078139A/en
Expired legal-status Critical Current

Links

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/124—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/325—Directional control characterised by the type of actuation mechanically actuated by an output member of the circuit
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions
    • F15B2211/853—Control during special operating conditions during stopping

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)
  • Actuator (AREA)

Abstract

1,078,139. Hydraulic actuators: POWER JACKS Ltd. Jan. 27,1966 [Oct. 27, 1964], No. 43784/64. Heading F1P. Cushioning near the end of the working stroke of a hydraulic ram (26) supplied by a pump (12) delivering through a line (3) and a spool valve (2) when opened against a biasing spring by low pressure fluid admitted through a line (6) to one end of the spool (9) is effected by abutment of the ram rod (24) against the rod (25) of a spring- biased piston (22) within a buffer cylinder (20) and the resulting increase in cylinder space (21) serves to relieve pressure at the said end of the spool (9) to which space (21) is connected by a line (27) thereby allowing the spool valve to be returned by its spring to the closed position. The other end of low pressure line (6) is connected to one end of a master cylinder (8) having a doubleskirted piston (14) which when displaced to the right against a spring pressurizes fluid in line (6). The lower end of valve spool (9) is relieved through a line (7), a port (15) in, the other skirt of piston (14) a cylinder port (18) and a line (11) connected to a sump (13). The high pressure supply line (3) is connected to sump (13) by a by-pass (11) having a shut-off valve (10) which is automatically closed on displacement of piston (14) to the ram-actuating position.
GB4378464A 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus Expired GB1078139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4378464A GB1078139A (en) 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4378464A GB1078139A (en) 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus

Publications (1)

Publication Number Publication Date
GB1078139A true GB1078139A (en) 1967-08-02

Family

ID=10430294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4378464A Expired GB1078139A (en) 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus

Country Status (1)

Country Link
GB (1) GB1078139A (en)

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