GB1407803A - Hydraulic valve apparatus - Google Patents

Hydraulic valve apparatus

Info

Publication number
GB1407803A
GB1407803A GB3824273A GB3824273A GB1407803A GB 1407803 A GB1407803 A GB 1407803A GB 3824273 A GB3824273 A GB 3824273A GB 3824273 A GB3824273 A GB 3824273A GB 1407803 A GB1407803 A GB 1407803A
Authority
GB
United Kingdom
Prior art keywords
hydraulic valve
valve apparatus
oct
fip
heading
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
GB3824273A
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.)
Dowty Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment 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 Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Priority to GB3824273A priority Critical patent/GB1407803A/en
Publication of GB1407803A publication Critical patent/GB1407803A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/26—Hydraulic or pneumatic control
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms
    • E21D23/20—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms for sequential movement, e.g. one behind the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1407803 Hydraulic control circuits DOWTY MINING EQUIPMENT 30 Oct 1972 [28 Oct 1971] 38242/73 Divided out of 1407801 Heading FIP [Also in Division F2] The description and drawings are substantially identical with those of the Parent Specification 1407801 but the claims are different.
GB3824273A 1971-10-28 1971-10-28 Hydraulic valve apparatus Expired GB1407803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3824273A GB1407803A (en) 1971-10-28 1971-10-28 Hydraulic valve apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3824273A GB1407803A (en) 1971-10-28 1971-10-28 Hydraulic valve apparatus

Publications (1)

Publication Number Publication Date
GB1407803A true GB1407803A (en) 1975-09-24

Family

ID=10402192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3824273A Expired GB1407803A (en) 1971-10-28 1971-10-28 Hydraulic valve apparatus

Country Status (1)

Country Link
GB (1) GB1407803A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2363693A1 (en) * 1976-09-07 1978-03-31 Hemscheidt Maschf Hermann MULTIPLE CONTROL UNIT FOR HYDRAULIC WALKING SUPPORT

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2363693A1 (en) * 1976-09-07 1978-03-31 Hemscheidt Maschf Hermann MULTIPLE CONTROL UNIT FOR HYDRAULIC WALKING SUPPORT

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee