GB659010A - Improvements in hydraulic pumps - Google Patents

Improvements in hydraulic pumps

Info

Publication number
GB659010A
GB659010A GB14837/49A GB1483749A GB659010A GB 659010 A GB659010 A GB 659010A GB 14837/49 A GB14837/49 A GB 14837/49A GB 1483749 A GB1483749 A GB 1483749A GB 659010 A GB659010 A GB 659010A
Authority
GB
United Kingdom
Prior art keywords
pistons
stage
delivery pressure
pump
stage unit
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
GB14837/49A
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.)
Lucas Support Services Ltd
Original Assignee
Integral 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 Integral Ltd filed Critical Integral Ltd
Priority to GB14837/49A priority Critical patent/GB659010A/en
Publication of GB659010A publication Critical patent/GB659010A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

659,010. Two-stage hydraulic pumps. INTEGRAL, Ltd., WESTBURY, F., BRAY, P. E., and PACKENHAM, E. W. June 2, 1949, No. 14837. [Class 102(i)] [Also in Group XXIX] A two-stage hydraulic pump comprises two pumping units in tandem, the second stage unit being a radial cylinder pump whose pistons 23 are operated on their working strokes by a cam on eccentric 24 with which they are held in contact only by the liquid supplied by the first stage unit, and an off-loading valve 46, (see Group XXIX), subjected to the final delivery pressure and controlling the latter automatically by relieving the first stage pressure back to the inlet and thereby rendering inoperative one or more pistons of the second stage unit at a predetermined delivery pressure whilst permitting the other pistons to operate at full stroke. When the delivery pressure exceeds a maximum value the valve cuts off communication between the first and second stages and delivery ceases. Liquid enters the pump at 15 and is delivered by a gear pump 12, 13 to an annular duct 21 communicating through inlet valves 22 with the cylinders 27. The liquid is delivered through valves 28 to an annular duct 30 communicating with an outlet 33. In one embodiment the inlet valves of one or more pistons are loaded by stronger springs than the other pistons so that they cannot open when the first stage delivery pressure is reduced. In another embodiment, the valve controls two or more ports leading to different groups of cylinders and the ports are closed successively as the delivery pressure rises. Specification 582,182 is referred to.
GB14837/49A 1949-06-02 1949-06-02 Improvements in hydraulic pumps Expired GB659010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB14837/49A GB659010A (en) 1949-06-02 1949-06-02 Improvements in hydraulic pumps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14837/49A GB659010A (en) 1949-06-02 1949-06-02 Improvements in hydraulic pumps

Publications (1)

Publication Number Publication Date
GB659010A true GB659010A (en) 1951-10-17

Family

ID=10048347

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14837/49A Expired GB659010A (en) 1949-06-02 1949-06-02 Improvements in hydraulic pumps

Country Status (1)

Country Link
GB (1) GB659010A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1005842B (en) * 1952-10-17 1957-04-04 Bendix Aviat Corp Adjustable pump unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1005842B (en) * 1952-10-17 1957-04-04 Bendix Aviat Corp Adjustable pump unit

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