Ngiziphi izinto ezisetjenziswa khulu zokuvala amavalvu?

Kunemihlobo eminengi yamavalvu, kodwana umsebenzi oyisisekelo uyafana, okutjho bona, ukuhlanganisa nofana ukuvala ukugeleza okuphakathi. Ngalokho-ke, umraro wokuvala ivalvu uvele khulu.

Ukuqinisekisa bona ivalvu ingavala kuhle ukugeleza okuphakathi ngaphandle kokuvuza, kuyatlhogeka ukuqinisekisa bona isivalo sevalvu siqinile. Kuneenzathu ezinengi zokuvuza kwevalvu, okufaka hlangana ukuklanywa okungakalungi, indawo yokuthintana yokuvala engakalungi, iingcenye zokubopha ezikhululekileko, ukulingana okukhulu hlangana nomzimba wevalvu nebhonethi, njll. Zoke iinkinga lezi zingadosela ekutheni ivalvu ingavalwa kuhle. Kuhlekuhle, lokho kudala umraro wokuvuza. Ngalokho-ke, ithekhnoloji yokuvala ivalvu yithekhnoloji eqakathekileko ehlobene nokusebenza kwevalvu nekhwalithi, begodu idinga irhubhululo elihlelekileko nelijulileko.

Iinsetjenziswa ezisetjenziswa khulu zokuvala amavalvu zifaka hlangana imihlobo elandelako:

1. NBR

Ukujamelana namafutha okuhle khulu, ukujamelana nokuguga okukhulu, ukujamelana nokutjhisa okuhle, ukunamathelana okuqinileko. Ububi bayo kukujamelana nokutjhisa okuphasi, ukujamelana kwe-ozone okumbi, izakhiwo ezimbi zombane, kanye nokuthamba okuphasi kancani.

2. EPDM

Isici esiqakatheke khulu se-EPDM kukumelana kwayo okuphezulu kwe-oksijini, ukujamelana ne-ozone nokujamelana nokugqwala. Njengombana i-EPDM ingeyomndeni we-polyolefin, ineemfanelo ezihle khulu zokukhiqiza.

3. PTFE

I-PTFE inokujamelana namakhemikhali okuqinileko, ukujamelana namafutha amanengi nama-solvents (ngaphandle kwama-ketone nama-ester), ukujamelana nobujamo bezulu obuhle nokujamelana ne-ozone, kodwana ukujamelana nokubanda okumbi.

4. Insimbi

Qaphela: I-cast iron isetjenziselwa amanzi, igesi kanye namafutha wemidiya ngezinga lokutjhisa elingu-≤100°C kanye nomfutho omncani we-≤1.6mpa.

5. I-alloy esekelwe ku-nickel

Qaphela: Iinhlanganisela ezisekelwe ku-nickel zisetjenziselwa amapayipi anamazinga womtjhiso we--70~150°C kanye nomfutho wobunjiniyela PN≤20.5mpa.

6. I-aloyi yekhopha

I-alloy yekhopha inokujamelana nokuguga okuhle begodu ilungele amapayipi wamanzi ne-steam anamazinga womtjhiso≤200°Ckanye nokugandeleleka kwe-PN≤1.6mpa.