Iivalvu zebhola zepneumaticumbindi uyajikeleziswa ukuze uvule okanye uvale ivalvu, kuxhomekeke kwimeko.
Iiswitshi zeevalvu zebhola ze-pneumatic zisetyenziswa kumashishini amaninzi ahlukeneyo kuba zilula, zincinci ngobukhulu, kwaye zinokuguqulwa zibe nobubanzi obukhulu.
Zikwanokutywinwa okuthembekileyo, isakhiwo esilula, kwaye kulula ukuzilungisa.

Iipayipi zihlala zisebenzisa umoyaiivalvu zebholaukusasaza ngokukhawuleza nokutshintsha indlela yokuhamba kwesixhobo esiphakathi. Uhlobo olutsha lwevalvu ebizwa ngokuba yivalvu yebhola yepneumatic lubonelela ngezi zibonelelo zilandelayo:

1. Ngenxa yokuba igesi ingumthombo wamandla wevalvu yebhola yomoya, uxinzelelo luphakathi kwe-0.2 kunye ne-0.8 MPa, edla ngokuthathwa njengekhuselekileyo.

2. Uluhlu olubanzi lwezicelo; ingasetyenziswa kwiimeko zoxinzelelo oluphezulu kunye noxinzelelo oluphezulu; ububanzi buqala kuncinci ukuya kwiimilimitha ezininzi, bukhulu ukuya kwiimitha ezininzi.

3. Kulula ukuyisebenzisa, ivula kwaye ivala ngokukhawuleza, kwaye ivumela ulawulo olulula lomgama omde ngokujikeleza nje iidigri ezingama-90 ukusuka ekuvulekeni ngokupheleleyo ukuya ekuvalekeni ngokupheleleyo.

4. Ukumelana nolwelo kuncinci, kwaye icandelo lombhobho elinobude obufanayo linomlinganiselo ofanayo wokumelana.

5. Kulula ukuyiqhaqha nokutshintsha ngenxa yesakhiwo esisisiseko sevalvu yebhola yomoya, iringi yokutywina eshukumayo, kunye nokulula kokugcinwa kwayo.

6. Imiphezulu yokutywina yesihlalo sebhola kunye nevalvu igqunyiwe kwi-medium nokuba ivalvu ivuliwe ngokupheleleyo okanye ivaliwe ngokupheleleyo, ngoko ke xa i-medium idlula, ayiyi kuyitshabalalisa umphezulu wokutywina ivalvu.

7. Iivalvu yebholaUmphezulu wokuvala wenziwe ngeplastiki edumileyo eneempawu ezilungileyo zokuvala eziye zasetyenziswa kakhulu kwiinkqubo zokucoca. Iqinile kwaye ithembekile.

8. Ukuba ivalvu yebhola yomoya iyavuza, ngokungafaniyo neenkqubo ze-hydraulic okanye zombane, igesi inokukhutshwa ngokuthe ngqo, enomgangatho ophezulu wokhuseleko kwaye ayonakalisi okusingqongileyo.