Auxiliary Valve QDS6 - Oleosistemas

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Catalogue HY17-8542/UK/USGeneralAuxiliary ValvesQDS6Subject to alteration without prior notice. The curves anddiagrams in this catalogue are typical examples only. While thecontents of the catalogue are updated continuously, the validityof the information given should always be confirmed. For moredetailed information, please contact Parker.2 Parker HannifinMobile Controls DivisionBorås, Sweden
Catalogue HY17-8542/UK/USGeneral InformationAuxiliary ValvesQDS6ApplicationsThe QDS6 sequence valve is designed toopen or close a hydraulic pilot signal (thatcomes from an external source) when itreaches a predetermined pressure level.Common applications of the valve are inpilot logic circuits and sequence-controlsub-circuits. One example of use is as ameans of load-moment limitation(overload protection) in the liftingfunctions of mobile cranes, in conjunctionwith hydraulic remote control. In suchcases, the QDS6 is used to break the pilotsignal between the control valve andthe directional valve when the signalpressure reaches a predetermined valueset on the QDS6.Construction and functionThe QDS6 is a three-way, pilot-operatedvalve. Its directional function is normallyopen or normally closed.The valve housing is manufacturedfrom continuously-cast grey iron and containsa precision-ground spool and pilotsection.When the pilot signal exceeds thepreset switching pressure, the spoolchanges position, thus blocking P andconnecting S with T. Alternatively, T isblocked and S connected with P (seefigure on page 4). The spool is positivelyoverlapped, i.e. it closes the one connectionbefore opening the other. The pilotsection can be drained either internally orexternally. Pilot sections with externaldrainage can be fed with an externalpressure in the drainage connection toobtain a higher switching pressure thanthe one preset.Advantages• Compact - easy to install.• Several pressure ranges available -enables high setting precision.• Easy to adjust pressure within specifiedpressure range - facilitates finetuning.• Can be factory-set and sealed - preventsunauthorized pressure changing.• Withstands high pressure shocks inthe tank connection - gives long servicelife in systems with high intermittenttank pressure.• Simple design - gives great reliability.Optional equipmentNumerous other options are available forthe QDS6. For further information, pleasecontact your Parker representative.• Hand wheel for easy changing of pressuresetting.• Flanged version of QDS6 for flangingdirectly to, e.g. a valve block.3 Parker HannifinMobile Controls DivisionBorås, Sweden
Page 1: Auxiliary ValveQDS6Sequence Valve,
Page 5 and 6: Catalogue HY17-8542/UK/USDimensions
Page 8: Hydraulics GroupSales OfficesEurope

Auxiliary Valve QDS6 - Oleosistemas

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