Expansion valve yog ib qho tseem ceeb ntawm lub tub yees system, feem ntau ntsia nruab nrab ntawm cov kua cia lub tog raj kheej thiab cov evaporator. Lub expansion valve ua rau cov kua refrigerant ntawm nruab nrab kub thiab siab siab ua ntub chav nyob rau hauv qis kub thiab tsis tshua muaj siab los ntawm nws throttling, thiab ces lub refrigerant absorbs tshav kub nyob rau hauv lub evaporator kom ua tiav cov nyhuv tub yees. Lub expansion valve tswj lub valve ntws los ntawm kev hloov pauv superheat thaum kawg ntawm cov evaporator los tiv thaiv kev siv tsis zoo ntawm thaj chaw evaporator thiab qhov tshwm sim ntawm khob lub tog raj kheej.
Cias muab, lub expansion valve yog tsim los ntawm lub cev, kub sensing pob thiab tshuav raj
Lub xeev ua haujlwm zoo tshaj plaws ntawm kev nthuav dav valve yuav tsum yog hloov qhov qhib hauv lub sijhawm tiag tiag thiab tswj tus nqi ntws nrog kev hloov pauv ntawm cov evaporator load. Tab sis qhov tseeb, vim yog lub hysteresis ntawm tshav kub hloov mus rau hauv lub hnab ntawv qhov kub thiab txias, cov lus teb ntawm lub expansion valve yog ib txwm ib nrab khiav qeeb. Yog hais tias peb kos ib lub sij hawm-flow daim duab ntawm ib tug expansion valve, peb yuav pom tias nws tsis yog ib tug du nkhaus, tab sis ib tug wavy kab. Qhov zoo ntawm lub expansion valve yog reflected nyob rau hauv lub amplitude ntawm lub nthwv dej. Qhov loj dua qhov amplitude, qhov qeeb ntawm cov tshuaj tiv thaiv ntawm lub valve thiab qhov tsis zoo ntawm qhov tsis zoo
