GB1078138A - Improvements in or relating to hydraulic control apparatus - Google Patents

Improvements in or relating to hydraulic control apparatus

Info

Publication number
GB1078138A
GB1078138A GB4378364A GB4378364A GB1078138A GB 1078138 A GB1078138 A GB 1078138A GB 4378364 A GB4378364 A GB 4378364A GB 4378364 A GB4378364 A GB 4378364A GB 1078138 A GB1078138 A GB 1078138A
Authority
GB
United Kingdom
Prior art keywords
valve
exhaust
line
spring
pass
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
GB4378364A
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 GB4378364A priority Critical patent/GB1078138A/en
Publication of GB1078138A publication Critical patent/GB1078138A/en
Expired 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
    • 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
    • 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
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

1,078,138. Hydraulic actuators. POWER JACKS Ltd. Jan.27, 1966 [Oct. 27, 1964], No.43783/64. Heading F1P. The pressure rise in fluid trapped on the exhaust side (49) Fig.1 (not shown) of a hydraulic ram (3) due to its momentum and which occurs on moving the spool (26) Fig. 2 (not shown) of the supply and exhaust valve (6) towards its closed central position by means of a biasing spring (29) opens a spring-loaded valve (35) in a by-pass (32) connecting the ram exhaust line with an end chamber (34) of the central valve cylinder (39) where said exhaust pressure opposes the spring (29) sufficiently to prevent complete closure of the valve spool until the exhaust pressure falls and valve (35) closes. The end space (34) is connected to one end of a low pressure line (43) having its other end connected to one end of a master cylinder (9) having a double-skirted piston (57) which when displaced to the right against a spring pressurizes fluid in line (43). The lower end of the valve spool (26) is connected by a similar low pressure line to the other end of master cylinder (9) and is connected through an orifice (57) in piston skirt (56), a line (58) and an open valve (45) to the reservoir (53). The valve (45) is connected in a by-pass (46) on the delivery side of the pump (54) and is automatically closed on displacement of the master piston (55). A plurality of rams (1, 2, 3) may be arranged in parallel and where they are double-acting a second by-pass (31) and valve (35) is provided.
GB4378364A 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus Expired GB1078138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4378364A GB1078138A (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
GB4378364A GB1078138A (en) 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus

Publications (1)

Publication Number Publication Date
GB1078138A true GB1078138A (en) 1967-08-02

Family

ID=10430288

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4378364A Expired GB1078138A (en) 1964-10-27 1964-10-27 Improvements in or relating to hydraulic control apparatus

Country Status (1)

Country Link
GB (1) GB1078138A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358988A (en) * 1980-02-13 1982-11-16 Salvador Gali Mallofre Control elements for gearbox ratio selectors in heavy vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358988A (en) * 1980-02-13 1982-11-16 Salvador Gali Mallofre Control elements for gearbox ratio selectors in heavy vehicles

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