I-UL kuma-Valve

I. Kuyini isitifiketi se-UL? Kungani ivalvu isidinga?

I-UL (Underwriters Laboratories) yinhlangano ezimele yokuqinisekisa ukuphepha edumile emhlabeni wonke. Emakethe yaseNyakatho Melika, isitifiketi se-UL asiphoqelekile nguhulumeni, kodwa "siyikhadi lokufinyelela" lokuvikela umlilo, igesi, ukulawula izimboni kanye neminye imikhakha. Amathenda amaningi ephrojekthi yase-US adinga ngokusobala ukuthi "Ama-Valve azofakwa ohlwini lwe-UL". Kuma-valve, kubonisa ukuthi umkhiqizo uhlangabezane nezindinganiso eziqinile zokuphepha kukagesi, ingozi yomlilo kanye nezimo zokusebenza ezimbi kakhulu. Kuyimfanelo ebalulekile yokungena emakethe ephezulu eNyakatho Melika kanye nokuhlanganyela ekubhideni kwephrojekthi.

II.Yiziphi izindinganiso ezisekelwe kakhulu kuzo isitifiketi se-UL sama-valve?

Ama-valve ngezinjongo ezahlukene asebenza ezindinganisweni ezahlukene:

- UL 429:Kuma-valve asebenza ngogesi (njengama-valve e-solenoid), hlola ukuvikela kwawo kagesi, ukwenyuka kwezinga lokushisa, impilo ye-coil, njll.

- UL 842:Amavalvu okulawula okwenziwa ngesandla, okucindezelayo noma okushisa amboze uketshezi oluvuthayo noluvuthayo (uphethiloli, udizili, uphethiloli, njll.).

- Amavalvu omlilo: amavalvu esango, amavalvu ebhabhathane, ivalvu yokuhlolanjll. kumele zihambisane ne-UL 262, i-UL 1091 kanye nezinye izindinganiso, futhi ukuhlolwa kufaka phakathi ukulingisa komthelela ophezulu kanye nomlilo. Ngaphezu kwalokho, kunezindinganiso ezikhethekile njenge-UL 842B zamavalvu kadizili/i-biodiesel.

III.Yini egxile ekuhlolweni kwesitifiketi se-UL?

Ingqikithi ukuqinisekisa "ukuphepha okubi kakhulu". Ngaphezu kokumelana nokucindezela nokuvala, kufanele kuqashelwe ngokukhethekile:

- Ukuphepha kukagesi:ukufakelwa kwekhoyili, izindlela zokwehluleka, ukulahleka kwezimo zamandla.

- Izimo zokusebenza ezibucayi kakhulu:amakhono okusebenza kanye nokusebenza kokuguga kwezinto ngaphakathi kwezinga lokushisa elisukela ku--29°C kuya ku-52°C.

- Kuphephile:kulingisa ingozi yokungasebenzi kahle noma ukuguga kwezinto.