UL mu ma Valves

I. Kodi satifiketi ya UL ndi chiyani? N’chifukwa chiyani valavu imafunikira?

UL (Underwriters Laboratories) ndi bungwe lodziwika bwino padziko lonse lapansi lopereka satifiketi yachitetezo. Mu msika wa North America, satifiketi ya UL si yokakamiza boma, koma ndi "khadi lolowera" loteteza moto, gasi, kuwongolera mafakitale ndi madera ena. Ma projekiti ambiri aku US amafunikira kuti "Value ikhale pamndandanda wa UL". Pa ma valve, zimasonyeza kuti malondawo akwaniritsa miyezo yokhwima ya chitetezo chamagetsi, chiopsezo cha moto komanso mikhalidwe yoopsa yogwirira ntchito. Ndi chiyeneretso chofunikira cholowa pamsika wapamwamba ku North America ndikutenga nawo mbali pakuyitanitsa ma projekiti.

II.Kodi chiphaso cha UL cha ma valve chimadalira miyezo iti?

Ma valve pazifukwa zosiyanasiyana amagwira ntchito pa miyezo yosiyanasiyana:

- UL 429:Pa ma valve ogwiritsidwa ntchito ndi magetsi (monga ma valve a solenoid), fufuzani momwe amatetezera magetsi, kukwera kwa kutentha, nthawi yogwira ntchito ya coil, ndi zina zotero.

- UL 842:Ma valve owongolera kutentha ndi manja, odzaza ndi mpweya kapena oteteza kutentha omwe amaphimba zakumwa zoyaka moto ndi zoyaka (mafuta, dizilo, mafuta, ndi zina zotero).

- Ma valve a moto: mavavu a chipata, mavavu a gulugufe, valavu yoyezerandi zina zotero ziyenera kutsatira UL 262, UL 1091 ndi miyezo ina, ndipo mayesowa akuphatikizapo kuyerekezera kwa mphamvu yamagetsi komanso malo oyaka moto. Kuphatikiza apo, pali miyezo yapadera monga UL 842B ya ma valve a dizilo/biodiesel.

III.Kodi cholinga chachikulu cha mayeso a UL certification ndi chiyani?

Chofunika kwambiri ndi kutsimikizira "chitetezo choipa kwambiri". Kuwonjezera pa kukana kupanikizika ndi kutseka, chisamaliro chapadera chiyenera kuperekedwa ku:

- Chitetezo cha magetsi:kutchinjiriza kwa coil, njira zolephera, kutayika kwa mphamvu.

- Mikhalidwe yoopsa yogwirira ntchito:mphamvu zogwirira ntchito ndi magwiridwe antchito okalamba a zinthu mkati mwa kutentha kwa -29°C mpaka 52°C.

- Yotetezeka:zimatsanzira chiopsezo cha kusagwiritsidwa ntchito bwino kapena kukalamba kwa zinthu.