Amavalvu okuvala uphethiloli ayizingxenye ezibalulekile ngaphakathi kwesistimu njengoba emele idivayisi yokuphepha yesenzo esihle. Indima eyinhloko edlalwa yilo mshini ukuvimbela nokuvimbela uphethiloli ngaphambi kokuba ufinyelele ku-burner, ngaleyo ndlela ugweme izinga lokushisa elibilayo lesifunda elingena ohlelweni ukuthi lingafinyelelwa. Lokhu kumelela indlela yokugwema ukulimala ohlelweni ngokwalo kodwa nakubantu abaseduze kwayo.

Isebenza kanjani ivalvu yokuvala uphethiloli?

Kunezingxenye ezimbili ezibalulekile ze-valve:
- Umzimba we-valve: lapho uphethiloli, uketshezi noma igesi, udlula;
- Idivayisi yokulawula: ifakwe isici esibucayi.
I-shutter rod ixhunywe kudivayisi yokulawula futhi ibangela ukuvala i-valve uma kunesidingo. Uma konke kusebenza kahle, i-shutter rod ihlezi phezu kwepiston futhi iqinisekisa ukuhamba kukaphethiloli. Kodwa-ke, uma ukungasebenzi kahle noma okungaqondakali kwenzeka, i-piston iyanyakaza futhi ibangele ukuvala ngokwehlisa i-shutter rod. Yiziphi lezi zimo?
- Ukunwetshwa ngokweqile koketshezi: i-piston inyakaza ngakwesobunxele futhi ibangele ukuthi induku yehle, ivale umzila wamafutha;
- Ukuphuka kwe-capillary: i-piston iya kwesokudla futhi ibangele, futhi, ukwehla kwenduku nokuvalwa kwephaseji.
Uma i-valve ivala, kungenzeka ukuthi ubuyele ekusebenzeni kuphela ngokusetha kabusha ngesandla okungenzeka kuphela uma uketshezi lunezinga lokushisa elingaphansi kwama-87 ° C futhi i-capillary ingaphukile noma yonakalisiwe.