1. Txheeb xyuas seb puas muaj qhov tsis xws luag cov xuab zeb thiab tawg rau ntawm sab hauv thiab sab nraud ntawm lub cev valve.
2. Tshawb xyuas seb lub rooj zaum valve thiab lub cev sib txuas tau yooj yim, txawm hais tias lub rooj zaum sib txuas thiab lub rooj valve tau sib phim, thiab seb cov khoom sib tsoo muaj qhov tsis xws luag.
3. Tshawb xyuas seb qhov kev sib txuas ntawm lub valve qia thiab valve core tov thiab txhim khu kev qha ntawv, seb lub valve qia yog khoov, thiab cov xov yog puas tsuaj los yog corroded.
4. Tshawb xyuas seb puas muaj cov ntim thiab gasket muaj hnub nyoog thiab puas, thiab seb lub pob hluav taws xob hloov tau yooj yim thaum qhib.
5. Yuav tsum muaj lub npe nyob rau ntawm lub cev lub cev, thiab lub xov tooj muaj npe: Chaw Tsim Tshuaj Lub Npe, Nominal siab, nominal lub cheeb thiab lwm tus txheeb xyuas.
6. Qhov qhib thiab kaw txoj haujlwm ntawm lub valve thaum lub sijhawm thauj mus los yuav tsum ua raws li cov cai hauv qab no:
(a) li qub xws li cov rooj vag, cov li qub, cov npauj npaim, ko taw li qub, thiab tswj cov nplai yuav tsum nyob hauv qhov chaw kaw tag nrho.
(b) Qhov chaw kaw ntawm Plug Li Li Qub thiab Cov Pob Tsuas yuav tsum nyob hauv qhov chaw qhib tag nrho.
(c) lub diaphragm valve yuav tsum nyob rau hauv txoj hauj lwm kaw thiab yuav tsum tsis txhob kaw nruj heev kom tiv thaiv kev puas tsuaj rau cov diaphragm valve. (d) lub valve disc ntawm daim tshev ntsuas yuav tsum tau kaw thiab tsau.
7. Lub caij nplooj ntoos hlav-cov khoom siv kev nyab xeeb yuav tsum muaj cov qaws txhuas yuav tsum muaj cov ntaub txhuas txhuas yuav tsum muaj cov khoom siv kev nyab xeeb yuav tsum muaj rauj hnyav.
8. Lub disc lossis valve cov tub ntxhais ntawm lub vijtsam kos yuav tsum txav tau yooj yim thiab muaj tseeb yam tsis muaj eccentricity, kev hloov lossis skewness.
9. The inner surface of rubber-lined, enamel-lined and plastic-lined valves should be flat and smooth, and the lining should be firmly bonded to the substrate without defects such as cracks and bubbles.
10. Cov Flange Sale nto yuav tsum ua kom tau raws li qhov yuav tsum tau ua thiab yuav tsum tsis txhob muaj lub radial khawb.
11. Lub valve yuav tsum tsis txhob puas, ploj lawm, corroded, lossis muaj lub npe poob tawm, thiab lub cev yuav tsum tsis txhob qias neeg.
12. Ob qho tib si xaus ntawm lub valve yuav tsum muaj kev tiv thaiv los ntawm kev tiv thaiv kev tiv thaiv, thiab kov lossis xuas tes tuav tau yoog raws li tsis muaj jamming.
13. Tus ntawv pov thawj zoo yuav tsum muaj cov hauv qab no:
(a) Chaw Tsim Tshuaj Lub Npe thiab Hnub Ua Haujlwm.
(b) Khoom npe khoom, qauv thiab cov lus qhia tshwj xeeb.
(c) nominal siab, nominal diameter, muaj qhov nruab nrab nruab nrab thiab muaj feem kub.
(d) Raws li tus qauv, tshuaj xyuas hnub xaus thiab kev kuaj xyuas hnub tim.
(e) Tus lej xov tooj Hoobkas, kos npe ntawm tus kuaj xyuas thiab tus neeg saib xyuas kev kuaj xyuas.
