Iivalvu yebhola yeplastikiyavela kwivalvu yeplagi. Inxalenye yayo yokuvula nokuvala yisphere, esebenzisa isphere ukujikeleza ama-90 degrees ukujikeleza i-axis yesiqu sevalvu ukufezekisa injongo yokuvula nokuvala. Ivalvu yebhola yeplastiki ifanelekile ekuthinteleni inkqubo yokuthutha nge-corrosive medium. Ngokwezixhobo ezahlukeneyo, ubushushu bokusebenza buyiI-PVC0℃～50℃, C-PVC 0℃～90℃, PP -20℃～100℃, PVDF -20℃～100℃. Ivalvu yebhola yeplastiki inokumelana nokugqwala okugqwesileyo. Indandatho yokutywina isebenzisa i-EPDM kunye ne-FKM; inokumelana nokugqwala okugqwesileyo kwaye yandisa ubomi benkonzo. Ukujikeleza okuguquguqukayo kwaye kulula ukuyisebenzisa. Ivalvu yebhola yeplastiki Ivalvu yebhola edibeneyo inamanqaku ambalwa okuvuza, amandla aphezulu, kwaye ivalvu yebhola yohlobo loqhagamshelo kulula ukuyihlanganisa nokuyiqhekeza.

Ivalvu yebhola yeplastiki ayilula nje kuphela ngesakhiwo, ilungile ekusebenzeni kokutywina, kodwa incinci ngobukhulu, ilula ngobunzima, iphantsi kokusetyenziswa kwezinto, incinci ngobukhulu bokufakelwa, kwaye incinci kwi-torque yokuqhuba ngaphakathi koluhlu oluthile lobubanzi. Kulula ukuyisebenzisa kwaye kulula ukufikelela ekuvulekeni nasekuvaleni ngokukhawuleza. Yenye yezona ntlobo zeevalvu ezikhula ngokukhawuleza kwiminyaka elishumi edlulileyo. Ingakumbi kumazwe aphuhlileyo afana ne-United States, iJapan, iJamani, iFransi, i-Itali, iNtshona, neBritane, ukusetyenziswa kweiivalvu zebholaibanzi kakhulu, kwaye iintlobo ngeentlobo kunye nobungakanani obusetyenzisiweyo busakhula.

Umgaqo osebenzayo wevalvu yebhola yeplastiki kukwenza ivalvu ivuleke okanye ivalwe ngokujikeleza isiqu sevalvu. Iswitshi iyaphatheka, incinci ngobukhulu, ithembekile ekutywineni, ilula kwisakhiwo kwaye ilula ekugcinweni. Umphezulu wokutywina kunye nomphezulu ongqukuva zihlala zikwimeko yokuvalwa kwaye azikhukuliseki lula yi-medium. Isetyenziswa kakhulu kumashishini ahlukeneyo.

Ivalvu yebhola luhlobo olutsha lwevalvu oluye lwasetyenziswa kakhulu kwiminyaka yakutshanje. Inezibonelelo ezilandelayo:

1. Ukumelana kolwelo kuncinci, kwaye i-coefficient yayo yokumelana ilingana nenxalenye yombhobho enobude obufanayo.

2. Isakhiwo esilula, ubungakanani obuncinci kunye nobunzima obulula.

3. Iqinile kwaye ithembekile. Okwangoku, izinto zokutywina zevalvu yebhola zisetyenziswa kakhulu kwiiplastiki ezisebenza kakuhle ekutywineni, kwaye zikwasetyenziswa kakhulu kwiinkqubo ze-vacuum.

4. Ukusebenza okulula, ukuvulwa nokuvalwa ngokukhawuleza, kufuneka ujikeleze kuphela i-90° ukusuka ekuvulekeni ngokupheleleyo ukuya ekuvalekeni ngokupheleleyo, nto leyo ilungele ulawulo olukude.

5. Ulondolozo olulula, ulwakhiwo olulula lwevalvu yebhola, iringi yokutywina idla ngokushukuma, kulula ukuyiqhaqha nokutshintsha.

6. Xa ivuliwe ngokupheleleyo okanye ivaliwe ngokupheleleyo, umphezulu wokutywina webhola kunye nesihlalo sevalvu ziyasuswa kwi-medium. Xa i-medium idlula, ayizukubangela ukuwohloka komphezulu wokutywina ivalvu.

7. Inoluhlu olubanzi lwezicelo, enobubanzi obuqala kwiimilimitha ezimbalwa ukuya kwiimitha ezimbalwa, kwaye ingafakwa ukusuka kwi-vacuum ephezulu ukuya kuxinzelelo oluphezulu.