Musi wa28 Chivabvu, 1983, mutungamiri wedu wechizvarwa chekutanga VaDong vakatanga Yongjia Valve Power Plant semutangiri weNSEN Valve. Mushure memakore makumi matatu nemasere apfuura, kambani iyi yakawedzera kusvika pa5500m2, uye vashandi vazhinji vakatevera kubva pakatanga NSEN, izvo zvatibaya mwoyo zvikuru.

Kubva pakagadzwa NSEN, shanduko diki dzese uye budiriro huru dzese, vanhu veNSEN vachiri kurangarirwa zvakajeka. Tichiri kurangarira mufaro wekuwana patent yeChina ye "Bidirectional sealing metal seated butterfly valve" muna 1997, iyo yaive rukudzo rwemakore gumi nemana ekutsvaga nekuita mushure mekugadzwa kwefekitori, uye zvakare yakavhura chiitiko chikuru mune ramangwana. Iro danho diki renhoroondo, ticharatidza zvimwe zvezviitiko zvikuru zvekambani kune wese munhu muchimiro chemifananidzo iri pazasi.

Tichitora mukana uyu, tinoda kutenda vatengi avo vagara vachititsigira, nekuti nerutsigiro rwenyu, tinogona kuramba tichibudirira uye tichifambira mberi. Panguva imwe chete, tichagadzira sevhisi iri nani kune vatengi nemweya uzere uye nechido. Ndinovimba kuti tinogona kubatana maoko uye kupupurira kukura kwemumwe nemumwe pamwe chete.