GB889128A - A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder - Google Patents

A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder

Info

Publication number
GB889128A
GB889128A GB3766959A GB3766959A GB889128A GB 889128 A GB889128 A GB 889128A GB 3766959 A GB3766959 A GB 3766959A GB 3766959 A GB3766959 A GB 3766959A GB 889128 A GB889128 A GB 889128A
Authority
GB
United Kingdom
Prior art keywords
pressure
channel
ram
line
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
GB3766959A
Inventor
Philip Benjamin Hinde
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.)
Avery Weigh Tronix Ltd
Original Assignee
W&T Avery 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 W&T Avery Ltd filed Critical W&T Avery Ltd
Priority to GB3766959A priority Critical patent/GB889128A/en
Publication of GB889128A publication Critical patent/GB889128A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0052—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for fluid driven presses

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

889,128. Stuffing-box substitutes. AVERY Ltd., W. & T. Jan. 16, 1961 [Nov. 6, 1959], No. 37669/59. Class 122 (5). [Also in Group XXIX] An hydraulic system for controlling leakage in a ram 1 and cylinder 2 apparatus, such as a press or material testing machine, comprises at least two spaced annular channels 8, 9 in the sliding surfaces of the cylinder or the ram, and a packing ring 20 provided between the cylinder and ram, the channel 8 nearer the working chamber 3 of the cylinder being connected to a source of liquid 7 at substantially the same pressure as that supplied to the working chamber, and the second channel 9 being connected to a valve 13 which permits free exhaust of liquid from the channel at relatively low pressure and a constant rate of flow above a predetermined pressure. The leakage between the ram and cylinder is controlled at the relatively low pressure by the flow between the channels and at higher pressures, the packing is progressively brought into action by the pressure of - liquid between the second channel and the packing. The working chamber 3 is connected by a line 4, control valve 5, which may be of the type described in Specification 777,343, and a line 6 to a pump 7 which is also connected by a line 10 and pressure-reducing valve 11 to the first channel 8. The second channel is connected by a line 12 to the valve 13 which is also connected to the valve 5 and exhaust. The valve 13 has an adjustable orifice 14 and a plunger 15 on one side subjected to the pressure of a spring 16 and the pressure at the orifice and, on the other side, connected by a by-pass 18 to the pressure in the line 12. When the pressure in the working chamber 3 is low, the plunger is moved by the spring to a position wherein the flow from the channel 9 is unrestricted and leakage from the ram is controlled by the flow from the channel 8. As the pressure in the chamber 3 rises, the pressure in channel 9, and hence line 12 and by-pass 18, increases, causing the plunger 15 to move and pass a constant rate of flow so that the pressure in channel 9 builds up to bring the packing into operation.
GB3766959A 1959-11-06 1959-11-06 A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder Expired GB889128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3766959A GB889128A (en) 1959-11-06 1959-11-06 A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3766959A GB889128A (en) 1959-11-06 1959-11-06 A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder

Publications (1)

Publication Number Publication Date
GB889128A true GB889128A (en) 1962-02-07

Family

ID=10398129

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3766959A Expired GB889128A (en) 1959-11-06 1959-11-06 A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder

Country Status (1)

Country Link
GB (1) GB889128A (en)

Similar Documents

Publication Publication Date Title
GB1004503A (en) Knife holder for circular-knife cutting machines
GB928078A (en) Hydraulic reversing control
GB889128A (en) A hydraulic system incorporating improved means for controlling leakage in a ram andcylinder
GB1041810A (en) Pneumatic-hydraulic feeding unit
ES8101429A1 (en) Pressure die casting
US2396296A (en) Fluid operated motor
GB1000411A (en) Improvements in and relating to valves for controlling fluid flow
GB964000A (en) Adjustable swash-plate,high-pressure pump for oil emulsion
ES423944A1 (en) Device for controlling the reciprocation of a working piston
GB1132826A (en) Hydraulic overload safety device for mechanical presses
GB953085A (en) Hydraulic actuator systems
GB899122A (en) Improvements in or relating to fluid pressure control valves
GB719390A (en) Improvements in or relating to hydraulic presses
GB1145087A (en) Improvements in fluid pressure control systems
GB928260A (en) Improvements in or relating to deep drawing presses
GB1162504A (en) Improvements in the Control of Hydraulic Presses.
ES346347A1 (en) Improvements in or relating to Die-Casting Machines
GB835814A (en) Hydraulic control valve apparatus
GB1034715A (en) Improvements in or relating to arrangements for the application of pressure in roll calenders
GB1031099A (en) Hydraulically operated apparatus having application in injection moulding machines
GB920832A (en) Improvements in or relating to the removal of liquids from a solids-liquids mixture
GB781288A (en) Improvements in and relating to control valves for hydraulic presses
GB920283A (en) Machine for grinding round or square bar material
GB863579A (en) Improvements in and relating to apparatus for controlling and, in particular, keeping constant the pressure in a pressure transmitter in hydraulically operating machinesfor testing materials
GB744057A (en) Improvements in or relating to forging presses