GB751005A - Improvements in or relating to valve devices for hydraulic mechanisms - Google Patents

Improvements in or relating to valve devices for hydraulic mechanisms

Info

Publication number
GB751005A
GB751005A GB386853A GB386853A GB751005A GB 751005 A GB751005 A GB 751005A GB 386853 A GB386853 A GB 386853A GB 386853 A GB386853 A GB 386853A GB 751005 A GB751005 A GB 751005A
Authority
GB
United Kingdom
Prior art keywords
piston
port
valve
exhaust
pull
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
GB386853A
Inventor
Allan Ashley
Ronald Fletcher Watson
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.)
Vinters Armstrongs Ltd
Original Assignee
Vinters Armstrongs Ltd
Vickers Armstrongs 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 Vinters Armstrongs Ltd, Vickers Armstrongs Ltd filed Critical Vinters Armstrongs Ltd
Priority to GB386853A priority Critical patent/GB751005A/en
Publication of GB751005A publication Critical patent/GB751005A/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve

Abstract

751,005. Fluid-actuated valves. VICKERSARMSTRONGS (ENGINEERS), Ltd. Feb. 8, 1954 [Feb. 11, 1953], No. 3868/53. Class 135. In a hydraulic system having a main jack and pull-back jacks, a valve device for controlling the supply and exhaust of pressure liquid to and from the pull-back jacks, comprises a casing 1 having a port 5 connected to the pull-back jacks, a port 25 connected to the main jack and ports 13, 24 alternately connected through a four-way cock either to a liquid pressure source or exhaust. The casing houses a first piston 11 having a valve head 8 urged by a spring 9 on to a seat 10, a second piston 21 having a stem 21A for engagement with the first piston, and a needle valve 18 controlling a port 16 through the valve head 8. The valve 18 is formed with a collar 19 engageable by a spring 20 to urge the collar against the piston 21 and the needle valve into engagement with the valve head 8. On rotation of the four-way cock to connect the port 13 to exhaust and the port 24 to the liquid supply source to supply the main jack pressure eventually builds up in the space 23 between the pistons to initially move the piston 21 against the spring 20 to unseat the valve 18 and permit a restricted opening of the pull-back jacks to exhaust. Further increase in pressure in the space 23 moves the piston 11 against the spring 9 to unseat the valve head 8 and fully open the pullback jacks to exhaust. On rotation of the four-way cock to connect the port 13 to the liquid supply source and the port 24 to exhaust, pressure liquid passes through radial holes 15 in the piston 11 and radial and axial holes 27, 26 in the valve 18 to the rear of the piston 21 to move it to engage the piston 11 to unseat the valve head 8 to supply the pull-back jacks with liquid. At the same time the main jack is connected to exhaust. The needle valve 18 may also be unseated against the spring 20 to relieve excessive pressure on the pull-back jacks. Pressure liquid may be fed direct to the main jack instead of passing through the ports 24, 25, in which case the port 24 is plugged and the port 25 connected by a sensing pipe to the main jack supply line. Specification 751,004 is referred to.
GB386853A 1953-02-11 1953-02-11 Improvements in or relating to valve devices for hydraulic mechanisms Expired GB751005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB386853A GB751005A (en) 1953-02-11 1953-02-11 Improvements in or relating to valve devices for hydraulic mechanisms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB386853A GB751005A (en) 1953-02-11 1953-02-11 Improvements in or relating to valve devices for hydraulic mechanisms

Publications (1)

Publication Number Publication Date
GB751005A true GB751005A (en) 1956-06-27

Family

ID=9766404

Family Applications (1)

Application Number Title Priority Date Filing Date
GB386853A Expired GB751005A (en) 1953-02-11 1953-02-11 Improvements in or relating to valve devices for hydraulic mechanisms

Country Status (1)

Country Link
GB (1) GB751005A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232230A (en) * 1989-05-12 1990-12-05 Omap Spa Improvements in double valves
CN102128284A (en) * 2011-03-21 2011-07-20 蒋晓军 Pressure-reduction type balance hydraulic lock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232230A (en) * 1989-05-12 1990-12-05 Omap Spa Improvements in double valves
CN102128284A (en) * 2011-03-21 2011-07-20 蒋晓军 Pressure-reduction type balance hydraulic lock
CN102128284B (en) * 2011-03-21 2012-08-22 蒋晓军 Pressure-reduction type balance hydraulic lock

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