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Coke drum bottom throttling valve and system

  • US 7,033,460 B2
  • Filed: 11/01/2004
  • Issued: 04/25/2006
  • Est. Priority Date: 09/05/2002
  • Status: Expired due to Term
First Claim
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1. A system for preventing the escape of an undue amount of steam from a coke de-heading device as it is being throttled wherein said system is one of(i) a bottom deheading system(ii) a top deheading system;

  • and(ii) a side deheading system;

    said system comprising a shroud enclosure capable of completely surrounding a linear blind gate valve as the blind is actuated thereby containing any released steam or coke debris and preventing that debris from being deposited into the valve bonnet; and

    a blind seal assembly having a blind seal slidably engaged against the blind to prevent the flow of steam thereby;

    wherein when the blind is in the open position, the one or more shroud return cap return springs bias the shroud end cap end plate to prevent a release of steam pressure from the valve body into the shroud.

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