Muyezo wa AWWA ndi womwe bungwe la American Water Works Association linatulutsa koyamba zikalata zogwirizana mu 1908. Masiku ano, pali miyezo yoposa 190 ya AWWA. Kuyambira gwero mpaka malo osungira, kuyambira kuyeretsa mpaka kugawa, miyezo ya AWWA imakhudza zinthu ndi njira zokhudzana ndi madera onse osamalira ndi kupereka madzi. AWWA C504 ndi yoyimira wamba, ndi mtundu wa valavu ya gulugufe yokhala ndi zinyalala.
Valavu ya gulugufe ya AWWA C504 ili ndi mitundu iwiri, chisindikizo chofewa cha mzere wapakati ndi chisindikizo chofewa chawiri, nthawi zambiri, mtengo wa chisindikizo chofewa cha mzere wapakati umakhala wotsika mtengo kuposa chisindikizo chofewa chawiri, ndithudi, izi nthawi zambiri zimachitika malinga ndi zofunikira za makasitomala. Nthawi zambiri kuthamanga kwa ntchito kwa AWWA C504 ndi 125psi, 150psi, 250psi, kuthamanga kwa kulumikizana kwa flange ndi CL125,CL150,CL250.
Valavu ya gulugufe ya AWWA C504 imagwiritsidwa ntchito kwambiri pa ntchito zoyeretsera madzi, chinthu chofunikira ndi madzi opanda zodetsa, makhalidwe a chisindikizo cha rabara amalimbitsa magwiridwe antchito otsekera a valavu, kotero kuti valavuyo ikhoza kutayikira 0. Posankha zinthu za thupi la valavu, nthawi zambiri chitsulo chosungunuka ndiye chachikulu, kutsatiridwa ndi chitsulo cha kaboni ndikothekanso. Kusankha mphete yotsekera ya valavu, EPDM, NBR, NR kulipo, malinga ndi zofunikira za kasitomala kuti asankhe.
Poyerekeza ndi ma valve a gulugufe a mndandanda wa EN558-13,14, valavu ya gulugufe ya AWWA C504 ili ndi thupi lokhuthala komanso spindle yokhuthala, ndipo palinso kusiyana pang'ono pamitundu ina, komwe kungawonekere patebulo lotsatira la miyeso. Zachidziwikire, pa ntchito yake, palibe kusiyana kwakukulu ndi ma valve ena a gulugufe otsekedwa ndi rabara.
Ndi opanga ati omwe angapange valavu ya gulugufe ya AWWA C504 ku China? Monga momwe ndikudziwira, palibe opanga ambiri omwe angapange valavu ya gulugufe ya AWWA C504, mafakitale ambiri ali ndi chidziwitso chochulukirapo pakupanga valavu ya gulugufe ya EN558-13/14, ndipo alibe chidziwitso chochuluka pakupanga valavu ya gulugufe ya AWWA C504, Tianjin Zhongfa Valve ndi m'modzi mwa opanga omwe angapange valavu ya gulugufe ya AWWA C504, Zhongfa Valve ili ndi nkhungu yakeyake komanso malo ake ogwirira ntchito, omwe amatha kumaliza kupanga valavu ya gulugufe ndi mtundu komanso kuchuluka kwake.
Chotsatirachi ndi valavu ya gulugufe ya AWWA C504 yopangidwa ndi Tianjin Zhongfa Valve, Ngati mukufuna kudziwa zambiri za zinthu za AWWA C504, muthanso kulumikizana nafe.
