Coke drum bottom throttling valve and system

• US 20050034969A1
• Filed: 11/01/2004
• Published: 02/17/2005
• 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 7,033,460 B2
• Time in Patent Office: Days
• US Class Current: 202/242
• 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 system as recited in claim 1, wherein the blind is configured to selectively slide between an opened position and a closed position.

3. A system as recited in claim 4, wherein when the blind is in the closed position, a shroud cap end plate of the shroud overcomes a biasing pressure from one or more shroud cap return springs and releases steam pressure from a valve body into the shroud.

4. A system as recited in claim 5, wherein when the blind is in the opened position, the one or more shroud cap return springs bias the shroud cap end plate to prevent a release of the steam pressure from the valve body into the shroud.

5. A system as recited in claim 1, wherein the system is one of:

(i) a bottom de-heading system;

(ii) a top de-heading system; and

(iii) a side de-heading system.

6. A system as recited in claim 1, further comprising a gate seal assembly coupled to a body of the blind gate valve, wherein the gate seal assembly is configured to float within a guide cup to reduce an amount of steam from escaping from the body when pressurized.