Ivali lesango lomgudu liklanywe futhi lakhiwa ngokuqinile ngokuvumelana nezindinganiso zaseMelika i-API 600 kanye ne-ASME B16.34. Lisebenzisa umzimba wensimbi ye-WCB carbon steel ohlanganisiwe onesakhiwo se-Outside Screw & Yoke (OS&Y) esiphakamayo. Isiqu esiphakamayo esibonakalayo singakhombisa ngqo iphesenti lokuvuleka kwevali. Lihlonyiswe ngesakhiwo se-wedge metal hard seal, lifinyelela ukungavuzi okuthembekile ngaphansi kwezimo zomsebenzi ezinomfutho ophakeme, lihambisana nokushayela ngesandla nge-handwheel ukuze kufinyelelwe ukuhlukaniswa okuphelele kokuvula nokuvala kwemidiya yepayipi.