Lub valve yog cov cuab yeej siv tshuab uas tswj cov dej ntws, ntws kev taw qhia, siab, kub, thiab lwm yam ntawm cov dej ntws nruab nrab, thiab lub valve yog qhov tseem ceeb hauv cov kav dej. Valve fittings yog technically tib yam li cov twj tso kua mis thiab feem ntau sib tham ua ib pawg. Yog li dab tsi yog hom ...
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