Direct-acting /(?)/

Di·rect·-act·ing

Direct-acting

a.
  1. Acting directly, as one part upon another, without the intervention of other working parts. (Mach.)

Phrases & Compounds
Direct-acting steam engine
one in which motion is transmitted to the crank without the intervention of a beam or lever; -- also called direct-action steam engine.
Direct-acting steam pump
one in which the steam piston rod is directly connected with the pump rod; -- also called direct-action steam pump.