Cov teeb meem tshwm sim ua ntej siv cov tshuaj cog li qub:
① Puas muaj qhov tsis xws luag, xws li cov xuab zeb qhov thiab cov kab nrib pleb, nyob rau sab hauv thiab sab nrauv ntawm cov roj hluav taws xob hluav taws xob;
②Txawm hais tias lub siab - lub rooj vag siab valve thiab cov roj hluav taws xob hluav taws xob txuas nrog nruj, seb lub valve tseem ceeb ua raws li qhov siab - lub siab lub rooj vag valve, thiab seb lub qhov rooj saum npoo muaj qhov tsis xws luag;
③ Txawm hais tias qhov kev sib txuas ntawm lub qia valve thiab cov tub ntxhais valve yog rhiab heev thiab txhim khu kev qha, txawm tias lub valve qia yog khoov, thiab seb cov xov sab nraud puas puas lawm;
④ Puas yog lub valve qhib dexterously?
