Blowout-pov thawj Stem thiab Primary Stem Seal
Lub xub pwg nyom yog ib feem ntawm qia, khaws cia rau hauv kom tsis txhob qia blowout los ntawm lub siab nyob rau hauv lub cev kab noj hniav.Lub hauv paus qia foob tiv thaiv kom tsis txhob nkag mus rau huab cua, kuj tseem ua haujlwm qis-torque bearing.
Precise, Smooth Ball
Pob sphericity thiab nto tiav yog qhov tseem ceeb hauv lub neej valve, lub peev xwm tuav, thiab kev ua haujlwm torque.