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API 6A Mavavu a Pulagi a torque otsika
Vavu yamapulagi ndi gawo lofunikira pakuyika simenti ndi fracturing m'minda yamafuta ndi migodi komanso kuwongolera kofananako kwamadzimadzi. Imakhala ndi mawonekedwe ophatikizika, kukonza kosavuta, torque yotsika, kutseguka mwachangu komanso kugwira ntchito kosavuta komwe ndiye valavu yabwino kwambiri pakati pa simenti ndi ma fracturing manifolds pompano. (Zonena: valavu imathanso kutsegulidwa kapena kutsekedwa mosavuta pansi pa 10000psi.)
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