Constructed annular safety valve element package
作者： Jeremy Buc Slay , Winston James Webber , Ewan Ogilvie Robb
DOI:
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摘要: An annular safety valve sealing package comprises an comprising a tubular housing; first element elastomeric material and disposed about the housing of valve; second adjacent element; third on opposite side from element. At least two material, or have different compositions.
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