I-valve uvemvane yomugqa omaphakathi we-BWSX iyivalve uvemvane yomugqa omaphakathi eyakhiwe ngokwethula ubuchwepheshe obuphambili obuvela phesheya. I-valve ye-butterfly ephakathi komugqa we-BWSX inezinzuzo zesakhiwo esilula, ukuvala uphawu okuthembekile, ukuvulwa okulula, impilo ende yesevisi kanye nokugcinwa okulula. Ngakho-ke, isetshenziswa kabanzi kumapayipi ahlukahlukene okunikezwa kwamanzi kanye nesistimu yokukhipha amanzi, ukwakha uhlelo lokuvikela umlilo, ikakhulukazi kumapayipi okuvikela umlilo.