Stem-proof Stem and Primary Stem Seal
Tsinde la tsinde ndi gawo lofunikira la tsinde, limasungidwa mkati kuti tsinde isaphulike ndi kukanikiza kwa thupi.Chisindikizo choyambirira chimalepheretsa kutayikira mumlengalenga, chimagwiranso ntchito ngati torque yotsika.
Zolondola, Mpira Wosalala
Kuzungulira kwa mpira ndi kutha kwa pamwamba ndi zinthu zofunika kwambiri pa moyo wa ma valve, mphamvu yogwiritsira ntchito mphamvu, komanso torque yogwiritsira ntchito.