I-Valve ye-Brass Spring yokuHlola ene-Filter yenziwe ngethusi elibunjiweyo, elikwabizwa ngokuba yi-valve engabuyiyo, eyenzelwe ukulawula ukuphuma kwenkqubo yokulawula ulwelo, ulwelo lulawulwa yi-disc kwaye luqukuqela kwicala elinye, lusetyenziswa ngokubanzi kwimibhobho, ukupompa, kunye nemibhobho.