Force Feedback Two Stage Valve

Oil is supplied at full system pressure to a pair of fixed orifices which discharge into two control pressure chambers at either cnd of the main spool. Oil from these two chambers is allowed to spill to tank via the two flapper.controlled variable orifices. The end covers at either end of the body are directly vented to tank return. A current passed through the force motor coils will tend to unbalance the flapper which in turn will set up a differential pressure in the control chambers. displacing the main spool in the opposite direction to that of flapper movement. The feedback springs housed inside the main spool convert spool displacement into a proportional force acting on the flapper and force motor armature. Thus balancing the magnetic force produced by the input current. When the new equilibrium condition has been reached. the flapper will be re-centred between the two nozzles. A current will therefore produce a proportional spool displacement.

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This entry was posted on Thursday, January 5th, 2012 at 3:16 am and is filed under Hydraulic Flow. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.