ʻOiai ʻike ʻia nā ʻili wai i kekahi manawa he huahana kūikawā - kahi koho maikaʻi loa o ka poʻe e hana a hoʻolālā paha i nā huahana paipu plastik no nā ʻōnaehana ʻoihana a i ʻole nā mea hoʻomaʻemaʻe ultra-maʻemaʻe ma kahi - me ka manaʻo ʻaʻole i nui ka hoʻohana maʻamau o kēia mau pahu. ʻike ʻia. ʻO ka ʻoiaʻiʻo, ʻoi aku ka nui o ka hoʻohana ʻana o nā kīwī plastik i kēia lā e like me ka hoʻonui ʻana o nā ʻano mea hana a me nā mea hoʻolālā maikaʻi e pono ai kēlā mau mea i manaʻo nui aʻe nā ala e hoʻohana ai i kēia mau mea hana.
NA WAIWAI O PLASTIK
ʻO nā mea maikaʻi o nā valve thermoplastic he ākea-ʻo ka corrosion, kemika a me ke kūpaʻa abrasion; pahee o loko; kaumaha māmā; maʻalahi o ka hoʻokomo; ka lōʻihi o ke ola; a haʻahaʻa ke kumu kūʻai o ke ola. ʻO kēia mau mea maikaʻi i alakaʻi i ka ʻae nui ʻana i nā valve plastik i nā ʻoihana kalepa a me nā noi ʻoihana e like me ka hāʻawi ʻana i ka wai, ka mālama ʻana i ka wai ʻino, ka metala a me ka hana kemika, nā meaʻai a me nā lāʻau lapaʻau, nā mea kanu mana, nā ʻaila hinu a me nā mea hou aku.
Hiki ke hana ʻia nā valve plastik mai nā ʻano mea like ʻole i hoʻohana ʻia i kekahi mau hoʻonohonoho. Hana ʻia nā kīwī thermoplastic maʻamau me ka polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), polypropylene (PP), a me ka polyvinylidene fluoride (PVDF). Hoʻohui pinepine ʻia nā kiwikā PVC a me CPVC i nā ʻōnaehana paipu ma nā ʻaoʻao kumu hoʻoheheʻe hoʻoheheʻe ʻana, a i ʻole nā ʻaoʻao wili a me nā flanged; akā, koi ʻo PP a me PVDF e hoʻohui i nā ʻāpana ʻōnaehana paipu, ma o nā ʻenehana wela, butt- a i ʻole electro-fusion.
ʻOi aku ka maikaʻi o nā valve Thermoplastic i nā kaiapuni corrosive, akā ua like lākou me ka pono i ka lawelawe wai maʻamau no ka mea ʻaʻole lākou ke alakaʻi 1, pale i ka dezincification a ʻaʻole e pala. Pono e ho'āʻo a hōʻoia ʻia nā ʻōnaehana paipu PVC a me CPVC i ka NSF [National Sanitation Foundation] maʻamau 61 no nā hopena olakino, me ke koi haʻahaʻa haʻahaʻa no Annex G. ʻO ke koho ʻana i nā mea kūpono no nā wai corrosive hiki ke mālama ʻia ma ke kūkākūkā ʻana i ke kūpaʻa kemika o ka mea hana. alakaʻi a hoʻomaopopo i ka hopena o ka wela ma luna o ka ikaika o nā mea plastik.
ʻOiai ʻo ka polypropylene ka hapalua o ka ikaika o PVC a me CPVC, loaʻa iā ia ke kūpaʻa kemika nui loa no ka mea ʻaʻohe mea hoʻohenehene i ʻike ʻia. Hana maikaʻi ʻo PP i nā ʻakika acetic concentrated a me nā hydroxides, a ua kūpono hoʻi ia no nā hoʻonā haʻahaʻa o ka hapa nui o nā waikawa, alkalis, paʻakai a me nā kinikona he nui.
Loaʻa ʻia ʻo PP ma ke ʻano he pigmented a i ʻole nā mea ʻole (maoli). Hoʻohaʻahaʻa nui ʻia ka PP kūlohelohe e ka radiation ultraviolet (UV), akā ua hoʻopaʻa pono ʻia nā pūhui i ʻoi aku ma mua o 2.5% carbon black pigmentation.
Ma muli o ka maʻalahi o ka thermoplastics i ka wela, e emi ana ka helu kaomi o ka valve i ka piʻi ʻana o ka mahana. Loaʻa i nā mea plastik like ʻole ka deration me ka piʻi ʻana o ka mahana. ʻAʻole paha ʻo ka wela o ka wai wale nō ke kumu wela e hiki ke hoʻopilikia i ka helu kaomi ʻana o nā kiwi palaki—ʻo ka wela o waho ke kiʻekiʻe e pono e lilo i ʻāpana o ka noʻonoʻo ʻana. I kekahi mau hihia, ʻaʻole i hoʻolālā ʻia no ka wela o waho e hiki ke hoʻonui i ka sagging ma muli o ka nele o nā kākoʻo paipu. He 140°F ka mahana lawelawe o PVC; Loaʻa i ka CPVC ka lōʻihi o 220°F; Loaʻa iā PP ka kiʻekiʻe o 180°F.
Loaʻa nā kiwi kinipōpō, nā kiwi hoʻopaʻa, nā kiwi lele a me nā kiwi diaphragm i kēlā me kēia o nā mea thermoplastic like ʻole no ka papa kuhikuhi 80 puʻupuʻu puʻupuʻu paipu i loaʻa pū kekahi o nā koho ʻoki a me nā mea pono. ʻO ka valve pōleʻa maʻamau ka mea maʻamau i ʻike ʻia he hoʻolālā uniona maoli e hoʻomaʻamaʻa i ka wehe ʻana i ke kino valve no ka mālama ʻana me ka ʻole o ka hoʻopili ʻana i ka paipu. Loaʻa nā kiwi hoʻopaʻa Thermoplastic e like me ka nānā ʻana i ka pōleʻa, nā loiloi koʻi, nā y-checks a me nā māka cone. Hoʻopaʻa maʻalahi nā kiwi kīpē me nā ʻāpana metala no ka mea ua kūlike lākou i nā puka pōʻai, nā pōʻai pōʻai a me nā ana holoʻokoʻa o ANSI Class 150. ʻO ke anawaena maʻemaʻe o loko o nā ʻāpana thermoplastic e hoʻohui wale i ka mana pololei o nā kiwi diaphragm.
Hana ʻia nā ʻāpana kinipōpō ma PVC a me CPVC e kekahi mau hui US a me nā ʻāina ʻē i ka nui o 1/2 iniha a hiki i 6 iniha me ke kumu, nā kaula a i ʻole nā loulou flanged. ʻO ka hoʻolālā uniona maoli o nā kīpē pōleʻa o kēia wā e loaʻa ana ʻelua mau nati e wili ana i ke kino, e hoʻopaʻa ana i nā sila elastomeric ma waena o ke kino a me nā mea hoʻopili hope. Ua mālama kekahi po'e mea hana i ka lō'ihi o ka ho'opa'a 'ana i ka valve pōle'ele a me nā kaula nut no nā makahiki he 'umi e hiki ai ke ho'ololi ma'alahi i nā valve kahiko me ka ho'ololi 'ole i ka paipu pili.
He mea maʻalahi ka hoʻokomo ʻana i ka valve butterfly no ka mea ua hana ʻia kēia mau kiwi i ke ʻano wafer me nā sila elastomeric i hoʻolālā ʻia i loko o ke kino. ʻAʻole pono lākou e hoʻohui i kahi gasket. E hoʻonoho ʻia ma waena o ʻelua mau lehelehe male, pono e mālama ʻia me ka mālama ʻana i ka bolting down of a plastic butterfly valve ma ka piʻi ʻana i ka torque bolt i ʻōlelo ʻia i ʻekolu mau pae. Hana ʻia kēia i mea e hoʻopaʻa pono ai i ka sila ma luna o ka ʻili a ʻaʻole i kau ʻia ke koʻikoʻi mechanical uneven ma ka valve.
Ka manawa hoʻouna: Dec-24-2019 