Laizhou Dongsheng Valve Co., Ltd , zipangizo processing patsogolo ndi wololera luso kupita patsogolo, luso mkulu ndi amisiri khalidwe ndi antchito.Fakitale yathu ndi 30,000 lalikulu mita ndi antchito 148.Pambuyo pa zaka 20 tikuyang'ana, takhala tikukhala malo otchuka padziko lonse lapansi opanga ma valve, ndipo katundu wathu amatumizidwa ku Ulaya, America, Africa, Southeast Asia, Australia ndi mayiko ena oposa 70 ndi zigawo.