A Hydraulic valve device includes a first engine port and a second engine port to a double acting hydraulic motor, and a pump, a hand valve, which is arranged such that it connects the engine ports to the tank and the pump, and which hand valve has two open positions, wherein the pump in the first …

Legal parties

Inventors (applicants): Bo Andersson
Assignees (initial): Nordhydraulic AB (Kramfors, SE)
Agents: Young & Thompson (attorney)

The application was examined by F. Daniel Lopez (USPTO dept. 3745)


  • 1. A hydraulic valve device comprising: …
  • 2. The valve device according to claim 1 , wherein the first nonreturn valve (1A) …
  • 3. The valve device according to claim 2 , wherein the hand valve (H) has an open …

International priority data

SE: 0701142 / May. 11, 2007 (national)

Cited documents


  • Barker et al. US 4610193 A / 91/420, Sep. 1, 1986
  • Brunner US 5191826 A, Mar. 1, 1993
  • Hristov et al. US 7752842 B2, Jul. 1, 2010
  • WO 2007019712 A1, Feb. 1, 2007
  • Evans US 2006/0075750 A1, Apr. 1, 2006
  • Brunner US 5259293 A, Nov. 1, 1993
  • Ishizaki et al. US 6170261 B1, Jan. 1, 2001
  • Toyooka et al. US 5479778 A / 60/468, Jan. 1, 1996
  • DE 19932948 A1, Feb. 1, 2000
  • DE 32 16 580, Feb. 1, 1983


Short Description of the Drawings

FIG. 1 shows a vehicle with a hydraulically manoeuvred boom and a hydraulic system with a double acting hydraulic lift cylinder and a conventional valve device mounted thereon; FIG. 2 is …


Technical Field of the Invention

The invention relates to a hydraulic valve device and is described by way of examples with particular reference to its application on hydraulically driven and manoeuvred lifting booms, which are common …

Detailed Description of the Figures

The hydraulically manoeuvred lifting boom shown in FIG. 1 is adapted to be arranged on a vehicle (not shown) and has a base A with a rotatable crane B …

More details about Hydraulic Valve Device

Miscellaneous patent data

The invention is titled Hydraulic Valve Device, originally classified under Expanding chamber inlet controlled by contracting chamber pressure or flow, the assignee is categorized as a foreign company or corporation, claims 1-9 comprise the invention scope, located in Kramfors (SE), the assignee company is Nordhydraulic AB, the known applicant's name is Andersson Bo, the patent is illustrated by 3 drawings, the patent particularly claims a hydraulic valve device comprising…, the known inventor's name is Bo Andersson, the term of the patent was extended by 1155 days, similar classification categories are electrical control means, in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage, Port in piston between opposed working faces, Fluid-operated pilot valve, Fluid distribution or supply devices characterised by their adaptation to the control of servomotors, Other details, Motive fluid constantly applied to one working member face (235) (417), Distributor moves about axis, the telescopic type, Adjustment for valving for plural chambers, the examination was conducted by F. Daniel Lopez (primary examiner, 3745 USPTO department), numbered 12/599,600 (application), the known agent - Young & Thompson, the exemplary patent drawings are vehicle with a hydraulically manoeuvred, Hydraulic diagram for the lift, Hydraulic Valve Device, Hydraulic diagram resembling the one in FIG., the application publication date is May. 12, 2008, invented by Bo Andersson, the claim number 1 is selected as exemplary, the patent was granted on Mar. 11, 2014, the grant number is 08667884, the invention details are shown in 6 figures.

Invention classification information

The invention is classified under Expanding chamber inlet controlled by contracting chamber pressure or flow, by regulating means in return line, by means of differential connection of the servomotor lines, e.g. regenerative circuits, Inlet fluid supplemented by controlled fluid pressurized in opposed contracting chamber. The designated search classifications include Contracting chamber exhaust valve controlled by expanding chamber pressure or flow, Expanding chamber inlet controlled by contracting chamber pressure or flow, Inlet fluid supplemented by controlled fluid pressurized in opposed contracting chamber.

Patent details
Publication number 08667884
Publication date Mar. 11, 2014
Kind code B2
Application number 12/599,600
Application date May. 12, 2008
Application type U
Application series code 12
Int. pub. country WO
Int. pub. number WO2008/147303
Int. publication Dec. 4, 2008
Int. filing country WO
Int. filing PCT/SE2008/050548
Filed internationally May. 12, 2008
National stage date Nov. 10, 2009
Extension term 1155
National classification 91/421
Total number of claims 9
Exemplary claims 1
Number of drawings 3
Number of figures 6
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