Cov yam ntxwv tseem ceeb ntawm hluav taws xob npauj npaim valve yog:
1. Novel thiab tsim nyog tsim, qauv zoo heev, lub teeb yuag, ceev qhib thiab kaw.
2. Lub zog ua haujlwm me me, kev ua haujlwm yooj yim, txuag zog thiab ntse.
3. Nws tuaj yeem ntsia tau rau hauv txhua txoj haujlwm thiab yooj yim los tswj.
4. Cov ntsaws ruaj ruaj tuaj yeem hloov tau, kev sealing kev ua tau zoo yog txhim khu kev qha, thiab ob txoj kev sealing yog pom tau, nrog xoom to.
5. Cov khoom siv sealing yog resistant rau kev laus, corrosion thiab kev pab lub neej ntev.
