Npauj npaim valve muaj qhov ntev ntawm cov qauv me me thiab qhov siab tag nrho, qhov qhib thiab kaw nrawm, cov kua dej me me thaum qhib tag nrho, thiab kev tswj cov dej ntws tawm thaum qhib txog li 15 degree txog 70 degree, cov qauv ntawm npauj npaim valve yog feem ntau. haum rau zus tau tej cov loj-bore li qub. Npauj npaim li qub tau pom zoo nyob rau hauv cov haujlwm hauv qab no:
1 yuav tsum tau throttling, regulating tswj ntws;
2 cov av nkos thiab cov xov xwm uas muaj cov khoom siv;
3 qhov yuav tsum tau ua ntawm luv luv ntawm lub valve qauv ntawm lub sijhawm;
4 qhov xav tau ntawm qhov qhib thiab kaw ceev ntawm lub sijhawm;
5 lub sijhawm sib txawv me me.
Nyob rau hauv ob-txoj hauj lwm hloov, necking channel, tsis tshua muaj suab nrov, cavitation thiab gasification tshwm sim, ib tug me me npaum li cas ntawm to mus rau lub cua, muaj abrasive nruab nrab, koj muaj peev xwm xaiv lub npauj npaim valve.
Thaum siv npauj npaim valve nyob rau hauv tshwj xeeb ua hauj lwm tej yam kev mob xws li throttling kev cai los yog xav tau nruj sealing, los yog hnyav hnyav, tsis tshua muaj kub (cryogenic) thiab lwm yam, tshwj xeeb npauj npaim li qub nrog triple los yog ob chav eccentricity yuav tsum tau tshwj xeeb tsim hlau seals nrog regulators.
