Orifice reducers chishandiso chinoshandiswa kudzora kuyerera kwemvura, chinowanzo shandiswa mupfapfaidzo misoro yemabhodhoro ezvinonhuwira kana zvimwe midziyo yemvura. Midziyo iyi inowanzo gadzirwa nepurasitiki kana rabha uye inogona kupinzwa pakavhurika yemusoro wekupfapfaidza, nokudaro ichideredza dhayamita yekuvhura kudzikamisa kumhanya uye huwandu hwemvura inoyerera ichibuda. Iyi dhizaini inobatsira kudzora huwandu hwechigadzirwa chinoshandiswa, kudzivirira tsvina yakawandisa, uye inogona zvakare kupa yakanyanya kurongeka uye yunifomu yekupfapfaidza maitiro. Vashandisi vanogona kusarudza yakafanira mavambo ekudzikisira zvinoenderana nezvavanoda kuti vawane inodiwa yemvura yekupfapfaidza maitiro, kuve nechokwadi chekushanda uye kwenguva refu kushandiswa kwechigadzirwa.