Inkcazo yemveliso yevalvu yokujonga ukuhamba komoya obuyela umva:

Ukuthintela ukungcola emva komoya jonga ukulahleka kwamanzi okuphantsi kakhulu, ukonga amandla kakhulu, kwisantya sokuhamba komoya (isantya se-2 m/s), ukulahleka kwentloko kungaphantsi kwe-4 mh20, ukwahlulwa komoya, ukukhupha amanzi ngokuzenzekelayo: vala ivalvu ephambili yesixhobo sokuhamba kwamanzi angasemva, idrayivu ezenzekelayo ivuleke, uxinzelelo lomngxuma ophakathi luyi-zero, ivalvu ephambili yokwahlulwa komoya okanye uxinzelelo oluyi-zero phakathi kokwahlulwa komoya oluphezulu nolusezantsi, ukwahlulwa komoya kuthembekile ekusebenzeni.

Isicelo semveliso yevalvu yokujonga ukuhamba komoya obuyela umva:
Ivalvu yokujonga ukuhamba kwamanzi okuchasene nokumelana okuphantsi isetyenziswa kakhulu phakathi kwenethiwekhi yemibhobho yokuhambisa amanzi ezidolophini kunye nazo zonke iintlobo zenethiwekhi yemibhobho yabasebenzisi, iipayipi zamanzi kunye nabasebenzisi bezindlu emva kwemitha yamanzi; Okanye ukwahlula phakathi kwamanzi okusela asekhaya namanzi aphakathi, amanzi omlilo, amanzi omoya opholileyo, amanzi aluhlaza kunye nezinye iinkqubo zamanzi ezahlukeneyo xa kuhlanganiswa, okanye ukufakelwa kwezixhobo zoxinzelelo olungenabungozi, kunokuthintela ngokungqongqo ukwenzeka kongcoliseko olubuyela umva.

INortech ngomnye wabavelisi beevalvu zoshishino abaphambili eTshayina abanesiqinisekiso somgangatho se-ISO9001.

Iimveliso eziphambili:Ivalvu yebhabhathane,Ivalvu yeBhola,Ivalvu yeSango,Jonga iValve,IGlobe Vavlve,Ii-Y-Strainers,Isixhobo sombane,Ii-Acurators ze-Pneumatic.

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