Jid 3-wallan oo hawo ah waa nooc ka mid ah valve loo isticmaalo xakameynta qulqulka hawada ee nidaamka sanqadha. Caadi ahaan waxay leedahay seddex dekedood: deked gudaheeda, deked ka baxsan, iyo deked kacsan. Falalka waxaa lagu habeyn karaa jagooyin kala duwan oo lagu hago socodka hawada ee u dhexeeya dekedahaas.
Waa tan sharaxaad aasaasi ah oo ku saabsan sida loo yaqaan '3-waalka hawada ay ka shaqeeyaan:
Meel caadi ah: Meesha caadiga ah, wanaagga wuxuu ku hayaa socodka hawada ee ka imanaya dekeda gudaha ilaa mid ka mid ah labada dekedood, halka dekada saddexaad uu wali xiran yahay ama ku xiran yahay darada. Mowqifkan waxaa caadi ahaan loogu yeeraa booska asalka ah ama meesha lagu nasto.
Nin dhaqansiis: Markuu waalka uu ku dhaqaaqayo, ama gacanta ama iyada oo loo marayo hab dibadda ah sida solonoid, waxay u beddeshaa jago kale. Dib-u-habeynta waddooyinka hawo-mareenka, hawada hawada ka haynta dekada ee dekeddii hore loo xiray, iyadoo la xirayo dariiqa asalka ah ama lagu toosinayo qiiqa.
Booska kale: Meesha kale, hawo-mareenka waxaa laga soo celiyaa dekada goobta gudaheeda ilaa deked kale marka loo eego booska caadiga ah. Tani waxay noqon kartaa dekeda bannaanka ama dekeda wasakhda ah, iyadoo kuxiran naqshadda iyo shuruudaha dalabka.
Xukumid: Jihada hawo-mareenka ee weelka lagu xakameyn karo iyadoo loo isticmaali karo kabaal ama garaac, ama si otomaatig ah u isticmaalida qalabka korantada ama pneumatic. Nidaamyada otomatiga ah, tuubada waxaa laga yaabaa in lagu xakameeyo dareemayaasha ama xamuulka suuxdinta ee barnaamijyada (plcs) si loo gaaro xakamayn sax ah oo ku saabsan qalliinka nidaamka ee maskaxda.
Guud ahaan, Valve-ka 3-ka ah ee hawada ayaa bixiya hab aan caadi aheyn oo lagu xakameeyo jihada hawo-mareenka ee nidaamyada dheecaanka leh, oo u oggolaanaya firfircoonaanta aaladaha kacsan sida dhululubooyinka, waxqabadka, iyo xakameeyaha.
