Thaum koj tab tom ua si sab nraud nrog koj cov phooj ywg nyob rau yav tsaus ntuj zoo nkauj, koj mam li hnov dheev suab nrov thiab ua rau lub ntsej muag luag ntxhi. Huag tsis muaj! Muaj, nyob deb, koj pom cov pa luam yeeb ntawm ib lub tsev nyob ze. Nws nyob hauv hluav taws, thiab cov tsheb tua hluav taws yuav teb rau qhov xwm ceev.
Koj pib xav txog seb cov neeg tua hluav taws tua hluav taws, thiab koj lub siab pib ua. Qhov twg yog qhov twg lawv tau txais tag nrho cov dej yuav tsum tau muab tawm qhov hluav taws kub? Puas yog cov tsheb tua hluav taws puas muaj lub dav hlau loj uas tuav tag nrho cov dej?
Cov tsheb tua hluav taws muaj dej tso, tab sis lawv tuav tsis tau dej txaus los tua hluav taws. Yog li, dej twg los qhov twg los? Feem ntau, cov dej tau los ntawm ib qho chaw nyob hauv koj lub zej zog. Lawv nyob ib puag ncig koj, thiab koj yuav tsis tshua pom lawv los yog muab lawv xav ob. Dab tsi yog peb tham txog? Hluav taws kub hydrants, ntawm chav kawm!
Qee lub sij hawm hu ua hluav taws kub, cov hluav taws kub hnyiab yog cov luv luv, cov hlab hlau uas koj pom txhua zaus nyob rau sab ntawm txoj kev nyob ze ntawm kev curb. Lawv tuaj yeem sib txawv hauv qhov loj thiab qhov tsos, tab sis lawv feem ntau zoo li tus cylinder nrog ntau yam txuas ntxiv thiab cov ntsiab lus sib txuas.
Cov hluav taws kub hnyiab tuaj yeem pleev xim rau xim, xws li qaim liab lossis daj, uas pab cov neeg tua hluav taws kom pom lawv yooj yim thaum muaj xwm ceev. Hauv qee thaj chaw, cov cai lij choj xav kom hluav taws kub hnyav tau xim tshwj xeeb yog nyob ntawm seb dej ntau npaum li cas lawv muaj peev xwm tuaj yeem ua rau muaj kev ntxhov siab. Qhov no yuav pab cov neeg tua hluav taws kom txiav txim siab uas qhov hluav taws xob tua hluav taws yog qhov zoo tshaj plaws los siv rau qhov teeb meem no.
Pom zoo rau kev tiv thaiv hluav taws, cov hluav taws tua hluav taws cia cov neeg tua hluav taws kom nkag mus rau hauv cov dej hauv zos sai sai. Lub tsheb tua hluav taws feem ntau yuav ua rau cov neeg tua hluav taws pib tua hluav taws thaum hos hle raug txuas mus rau qhov hluav taws kub ze tshaj plaws.
Feem ntau cov neeg tua hluav taws feem ntau yuav tsum siv cov pentru xov ciam pentru hlau tshwj xeeb kom tshem tawm lub hau ntsaws rau ntawm lub qhov hluav taws kub tawm. Thaum muab cov npog tshem tawm, cov neeg tua hluav taws tuaj yeem tso hos mus rau hauv cov qub. Lawv mam li qhib lub valve uas tso cai rau dej ntws los ntawm txoj kev mus rau hauv hoses.
Cov hluav taws kub hnyiab tau tuaj yeem muab dej ntim loj. Cov dej no pumped los ntawm cov hos mus rau lub tsheb tua hluav taws, qhov twg nws tau muab cov dej tso rau hauv thiab muab faib ua ob peb kwj deg kom muaj dej ntau rau hluavtaws hos ib zaug.
Lub tswv yim ntawm cov hluav taws kub niaj hnub no tau muab tso rau Frederick Graff, Sr., uas tau tsim cov khoom siv sib txuas ua ke thiab lub qhov dej tawm thaum xyoo 1800s ua tus thawj coj ntawm Philadelphia Dej Works. Nws tsim tau yog "tsim ntub-tsim" tsim, vim hais tias ib feem ntawm qhov dej hauv qab hauv av tau ntim nrog dej vim lub valve nyob saum.
Feem ntau cov hluav taws kub hnyiab hnub no uas siv rau hauv cov cheeb tsam uas muaj kev khov dej txias yog cov "qhuav-chim" cov qauv. Hauv cov dej haus, cov valve nyob hauv av hauv qab ntawm txoj kab khov. Qhov no txhais tau tias tsis muaj dej nyob hauv ib qho av saum toj no, yog li tiv thaiv kom txhob muaj dej khov hauv txias txias.
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