Coke drum bottom throttling valve and system

• US 20040045803A1
• Filed: 10/18/2002
• Published: 03/11/2004
• Est. Priority Date: 09/05/2002
• Status: Active Grant

• Current Assignee: DeltaValve, LLC (Circor International Incorporated)
• Original Assignee: Curtiss-Wright Flow Control Corporation (Curtiss-Wright Corporation)
• Inventors: Lah, Ruben F., Larsen, Gary
• Granted Patent: US 6,843,889 B2
• Time in Patent Office: Days
• US Class Current: 202/245
• CPC Class Codes: C10B 25/10 for ovens with vertical chambers
• CPC Class Codes: F16K 3/312 Line blinds
• CPC Class Codes: Y10T 137/0514 Gate valve
• CPC Class Codes: Y10T 137/6014 Faucet type [e.g., domestic water use, etc.]
• CPC Class Codes: Y10T 137/6017 Including removable valve head and seat unit
• CPC Class Codes: Y10T 137/6038 Particular valve seat or interface seal
• CPC Class Codes: Y10T 137/6041 Replaceable
• CPC Class Codes: Y10T 137/6072 Gate valve
• CPC Class Codes: Y10T 137/6075 Bifaced

Abstract

A coke drum bottom de-heading system having an internal shroud enclosure and a shroud end cap opened by a flange to a coke bottom de-heading valve capable of accepting the end of a gate valve upon actuation. Acting in coordination with the shroud enclosure to prevent the escape of steam is a gate seal assembly having a gate seal slidably engaged against the sliding gate to prevent the passage of steam thereby.

Claims

1. A system for preventing the escape of an undue amount of steam from a coke de-heading device as it is being throttled, 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.

2. A gate seal for reducing the escape of steam past a blind upon actuation of the blind inside or a valve body, said gate seal comprising:

a gate seal that floats within a guide cup to reduce the amount of steam escaping from a pressurized valve body as the blind is actuated between open and closed positions; and

a load spring to bias the seal against the blind.

3. A blind with a replaceable nose ring for use in a gate valve through which abrasive materials pass, said blind comprising:

a blind having an orifice through which abrasive materials pass; and

at least a portion of the area surrounding the orifice being constructed of a replaceable ring of wear resistant material, said ring being secured to the blind at the bottom of the blind.