Direct-acting
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Acting directly, as one part upon another, without theintervention of other working parts. Direct-acting steam engine, onein which motion is transmitted to the crank without the interventionof a beam or lever; -- also called direct-action steam engine.-- Direct-acting steam pump, one in which the steam piston rod isdirectly connected with the pump rod; -- also called direct-actionsteam pump.
Direct-acting meaning & definition 1 of Direct-acting.