Noho kiwikā pulelehuaʻO ia kahi ʻāpana wehe ʻia i loko o ka valve, ʻo ke kuleana nui ke kākoʻo i ka papa valve e wehe piha ʻia a pani piha ʻia paha, a hana i ka vice sila. ʻO ka maʻamau, ʻo ke anawaena o ka noho ka nui o ke caliber valve. He ākea loa ka mea noho valve butterfly, ʻo nā mea i hoʻohana pinepine ʻia he EPDM sila palupalu, NBR, PTFE, a me ka mea carbide sila paʻakikī metala. Ma hope aʻe e hoʻolauna mākou i hoʻokahi.
1.EPDM-Ke hoʻohālikelike ʻia me nā ʻano hana maʻamau ʻē aʻe, he mau pono nui ko ka ʻano EPDM, i hōʻike nui ʻia ma:
A. He kumukūʻai kūpono loa, i loko o nā maiʻa i hoʻohana pinepine ʻia, ʻo ka sila ʻōpala maka o EPDM ka māmā loa, hiki iā ʻoe ke hana i ka nui o ka hoʻopiha ʻana, e hoʻemi ana i ke kumukūʻai o ka ʻōpala.
B. Ke kūpaʻa ʻana o ka mea EPDM i ka wā ʻelemakule, kū i ka lā, ke kūpaʻa wela, ke kūpaʻa wai, ke kūpaʻa radiation, kūpono no nā waikawa nāwaliwali a me nā alkali media, nā waiwai insulation maikaʻi.
C. Pae mahana, ʻo ka haʻahaʻa loa hiki ke -40 ° C - 60 ° C, hiki ke 130 ° C nā kūlana mahana no ka hoʻohana lōʻihi.
2.NBR-kūpaʻa i ka ʻaila, kūpaʻa i ka wela, kūpaʻa i ke kapa a i ka manawa like he kūpaʻa maikaʻi i ka wai, sila ea a me nā waiwai hoʻopili maikaʻi loa. ʻO ka hemahema, ʻaʻole ia e kūpaʻa i nā mahana haʻahaʻa, kūpaʻa ozone, nā waiwai insulation maikaʻi ʻole, a he laulā hoʻi ka elasticity.
3. PTFE: he plastic fluorine, he kūpaʻa ikaika kēia mea i ka waikawa a me ka alkali, a he hana maikaʻi nā mea hoʻoheheʻe organik like ʻole, ʻoiai ke kūpaʻa nei ka mea i ke kiʻekiʻe o ka mahana, hiki ke hoʻohana mau ʻia ma 260 ℃, hiki i ke kiʻekiʻe loa ke piʻi i 290-320 ℃. Ua puka mai ʻo PTFE, ua hoʻoponopono pono i nā pilikia he nui i ka ʻoihana kemika, ka ʻaila, ka lāʻau lapaʻau a me nā ʻoihana ʻē aʻe.
4. Sila paʻakikī metala (carbide): ʻO ka noho kiwikā sila paʻakikī metala he kūpaʻa maikaʻi loa i ke kiʻekiʻe o ka mahana a me ke kaomi kiʻekiʻe, ke kūpaʻa i ka pala, nā ʻano pale ʻaʻahu, maikaʻi loa e hoʻoponopono i nā hemahema o ka mea sila palupalu ʻaʻole ia e kūpaʻa i ke kiʻekiʻe o ka mahana a me ke kaomi kiʻekiʻe, akā ʻo ka mea sila paʻakikī i nā koi hana o ke kaʻina hana he kiʻekiʻe loa ia, ʻo ka hemahema wale nō o ka hana sila kiwikā sila paʻakikī metala he haʻahaʻa, e lōʻihi ka manawa ma hope o ka hana o ka hana o ka leakage.