Embonini yesimanje yokulawula ukugeleza, ama-valve okuhlola ama-wafer athandwa kakhulu ngenxa yedizayini yawo ehlangene, ukufakwa kalula kanye nezindleko eziphansi zokuqala nezokulungisa uma kuqhathaniswa nokuhlola okujwayelekile okuphendukile.I-BVMC inikeza ipuleti elilodwa kanye nama-valve okuhlola amapuleti amabili anezinto ezihlukahlukene.