Mukusankha valavu ya dongosolo latsopano. Kusankha yomwe singathe kuthana ndi kuthamanga kwa chingwe kungayambitse kuphulika kwadzidzidzi komanso koopsa, komwe kungayambitse kusefukira kwa madzi, kuwonongeka kwa katundu, komanso nthawi yopuma yokwera mtengo.

Valavu yodziwika bwino ya mpira wa PVC nthawi zambiri imayesedwa kuti ndi 150 PSI (Mapaundi pa Inchi imodzi) pa 73°F (23°C). Kuchuluka kwa kuthamanga kumeneku kumachepa kwambiri pamene kutentha kwa madzi kumawonjezeka, choncho nthawi zonse muyenera kuyang'ana deta ya wopanga.

Ichi ndi chimodzi mwa zinthu zofunika kwambiri zomwe ndimakambirana ndi anzanga monga Budi.kupanikizikasikuti kungowerenga nambala yokha; koma ndikuonetsetsa kuti makasitomala ake ali otetezeka komanso odalirika. Pamene gulu la Budi lingathe kufotokoza molimba mtima chifukwa chakeValavu ya PSI 150Ndi yabwino kwambiri pa njira yothirira koma osati pa mzere wotentha wamadzimadzi, amasintha kuchoka pa kukhala ogulitsa kupita ku kukhala alangizi odalirika. Chidziwitso ichi chimaletsa kulephera ndikumanga ubale wa nthawi yayitali, wopindulitsa aliyense womwe ndi maziko a bizinesi yathu ku Pntek.

Kodi PVC imayesedwa bwanji kuti ndi yokwera mtengo?

Kasitomala wanu akuganiza kuti ziwalo zonse za PVC ndi zofanana. Cholakwika choopsa ichi chingawapangitse kugwiritsa ntchito chitoliro chotsika mtengo chokhala ndi valavu yapamwamba, zomwe zimapangitsa kuti nthawi yawo ichepe.

Kuchuluka kwa mphamvu ya PVC kumadalira makulidwe a khoma lake (Schedule) ndi m'mimba mwake. Chitoliro cha Standard Schedule 40 chingachokere pa 400 PSI kwa ang'onoang'ono mpaka pansi pa 200 PSI kwa akuluakulu.

Ndi kulakwitsa kofala kuganiza kuti makina amapatsidwa 150 PSI chifukwa chakuti valavu ya mpira ndi yolimba. Nthawi zonse ndimagogomezera Budi kuti makina onse ndi olimba monga momwe mbali yake yofooka imachitira. Kuchuluka kwa mphamvu ya PVCchitolirondi yosiyana ndi valavu. Imatanthauzidwa ndi "Ndondomeko," yomwe imatanthauza makulidwe a khoma.

• Ndandanda 40:Uwu ndiye makulidwe a khoma omwe amagwiritsidwa ntchito kwambiri pothirira madzi ndi mapaipi ambiri.
• Ndandanda 80:Chitolirochi chili ndi khoma lokhuthala kwambiri, motero, chili ndi mphamvu zambiri. Nthawi zambiri chimagwiritsidwa ntchito m'mafakitale.

Chofunika kwambiri ndichakuti kuchuluka kwa kupanikizika kumasintha malinga ndi kukula kwa chitoliro. Nayi kufananiza kosavuta kwa chitoliro cha Schedule 40 pa 73°F (23°C):

Dongosolo lokhala ndi chitoliro cha 4″ Sch 40 ndi ma valve athu a mpira a 150 PSI lili ndi mphamvu yogwira ntchito yokwana 150 PSI. Muyenera nthawi zonse kupanga chinthu chotsika kwambiri.

Kodi valavu ya mpira imathamanga bwanji?

Mukuwona valavu yamkuwa yoyesedwa kuti ndi 600 PSI ndi valavu ya PVC yoyesedwa kuti ndi 150 PSI. Kusamvetsetsa chifukwa chake ndi osiyana kungapangitse kuti zikhale zovuta kusankha yoyenera pa ntchitoyi.

Kuchuluka kwa mphamvu ya valavu ya mpira kumatsimikiziridwa ndi zinthu zake ndi kapangidwe kake. Mavalavu a PVC nthawi zambiri amakhala 150 PSI, pomwe mavalavu achitsulo opangidwa ndi mkuwa kapena chitsulo amatha kuwerengedwa pakati pa 600 PSI ndi kupitirira 3000 PSI.

Teremuyo"Valavu ya mpira"akufotokoza ntchito yake, koma mphamvu ya kupanikizika imachokera ku zipangizozo. Ndi chitsanzo chabwino kwambiri chogwiritsa ntchito chida choyenera pantchitoyo. Kwa makasitomala ake, gulu la Budi liyenera kuwatsogolera kutengera momwe akugwiritsira ntchito.

Zinthu Zofunika Kwambiri Zodziwira Kuchuluka kwa Kupanikizika:

1. Zinthu Zofunika pa Thupi:Ichi ndiye chinthu chachikulu chomwe chimapangitsa izi. PVC ndi yolimba, koma chitsulo ndi cholimba. Mkuwa ndi chinthu chogwiritsidwa ntchito kwambiri pamadzi otentha okhala m'nyumba komanso ntchito zambiri mpaka 600 PSI. Chitsulo cha kaboni ndi chitsulo chosapanga dzimbiri zimagwiritsidwa ntchito pamakampani omwe ali ndi mphamvu zambiri pomwe mphamvu zimatha kukhala zikwizikwi za PSI.
2. Mpando & Zinthu Zosindikizira:Ziwalo "zofewa" zomwe zili mkati mwa valavu, monga mipando ya PTFE yomwe mavavu athu a Pntek amagwiritsa ntchito, zimakhalanso ndi malire a kuthamanga ndi kutentha. Ziyenera kukhala zokhoza kupanga chisindikizo popanda kusokonekera kapena kuwonongedwa ndi kuthamanga kwa dongosolo.
3. Kapangidwe kake:Mmene thupi la valavu limagwirira ntchito zimathandizanso pa mphamvu yake.

A Ma valve a PVCChiyeso cha 150 PSI ndi chokwanira pa ntchito zambiri zamadzi zomwe adapangira, monga kuthirira, maiwe, ndi mapaipi amadzi okhala m'nyumba.

Kodi kupanikizika kwa valve ndi chiyani?

Mumawona “150 PSI @ 73°F” pa valavu. Ngati mungoyang'ana pa 150 PSI yokha ndikunyalanyaza kutentha, mutha kuyika valavuyo pamzere pomwe ikutsimikizika kuti ilephera.

Kuyeza kwa kuthamanga kwa valavu ndi kuthamanga kotetezeka kwambiri komwe valavu ingathe kugwira pa kutentha kwinakwake. Pa mavalavu amadzi, izi nthawi zambiri zimatchedwa kuyeza kwa Cold Working Pressure (CWP).

Tanthauzo la magawo awirili—kupanikizikaatkutentha—ndi lingaliro lofunika kwambiri kuphunzitsa. Ubalewu ndi wosavuta: kutentha kukakwera, mphamvu ya zinthu za PVC imatsika, komanso kupanikizika kwake kumatsika. Izi zimatchedwa "de-rating." Ma valve athu a Pntek amayesedwa kuti ndi 150 PSI pa kutentha kwa chipinda komwe madzi amatentha. Ngati kasitomala wanu ayesa kugwiritsa ntchito valavu yomweyi pamzere wokhala ndi madzi a 120°F (49°C), kuthamanga komwe angagwire kungachepe ndi 50% kapena kuposerapo. Wopanga aliyense wodziwika bwino amapereka tchati chochepetsera kupanikizika komwe kukuwonetsa kuthamanga kwakukulu kovomerezeka pa kutentha kwakukulu. Ndatsimikiza kuti Budi ili ndi ma chart awa pazinthu zathu zonse. Kunyalanyaza ubalewu ndiye chifukwa chachikulu cha kulephera kwa zinthu m'mapaipi a thermoplastic.

Kodi valavu ya mpira ya Class 3000 ndi yotani?

Kasitomala wa mafakitale akupempha valavu ya “Class 3000″”. Ngati simukudziwa tanthauzo la izi, mungayese kupeza valavu yofanana ndi PVC, yomwe palibe, ndipo ikuwonetsa kusowa kwa luso.

Valavu ya mpira ya Class 3000 ndi valavu yamafakitale yopangidwa ndi chitsulo chopangidwa ndi chitsulo, yoyesedwa kuti igwire 3000 PSI. Iyi ndi gulu losiyana kwambiri ndi mavavu a PVC ndipo imagwiritsidwa ntchito popanga mafuta ndi gasi.

Funso ili lithandiza kulemba mzere womveka bwino mumchenga wa momwe zinthuzo zingagwiritsidwire ntchito. Ma Rating a “Class” (monga, Class 150, 300, 600, 3000) ndi gawo la muyezo winawake wa ANSI/ASME womwe umagwiritsidwa ntchito pa ma flange ndi ma valve a mafakitale, nthawi zambiri opangidwa ndi chitsulo. Dongosolo lowerengera ili ndi lovuta kwambiri kuposa CWP yophweka pa valavu ya PVC.Valavu ya kalasi 3000Sikuti ndi yongogwiritsa ntchito mphamvu yamagetsi yokha; yapangidwira kutentha kwambiri komanso malo ovuta monga omwe amapezeka mumakampani opanga mafuta ndi gasi. Ndi chinthu chapadera chomwe chimawononga ndalama zambiri kapena zikwizikwi. Kasitomala akapempha izi, akugwira ntchito mumakampani enaake omwe sali oyenera PVC. Kudziwa izi kumathandiza gulu la Budi kuzindikira nthawi yomweyo pulogalamuyo ndikupewa kunena mawu pantchito yomwe zinthu zathu zingagwiritsidwe ntchito molakwika. Zimalimbitsa ukatswiri podziwa zomwe mumachitaosaterogulitsani, monga momwe mumachitira.

Mapeto

Kuthamanga kwa valavu ya mpira wa PVC nthawi zambiri kumakhala 150 PSI kutentha kwa chipinda, koma izi zimachepa kutentha kukakwera. Nthawi zonse gwirizanitsani valavu ndi kuthamanga kwa makina ndi kutentha komwe kumafunika.