Coke drum bottom throttling valve and system

• US 6,843,889 B2
• Filed: 10/18/2002
• Issued: 01/18/2005
• Est. Priority Date: 09/05/2002
• Status: Expired due to Term

• Current Assignee: DeltaValve, LLC (Circor International Incorporated)
• Original Assignee: Curtiss-Wright Flow Control Corporation (Curtiss-Wright Corporation)
• Inventors: Lah, Ruben F., Larsen, Gary
• Primary Examiner(s): Caldarola, Glenn
• Assistant Examiner(s): WACHTEL, ALEXIS A
• Application Number:
  US10/274,280
• Publication Number:
  US 20040045803A1
• Time in Patent Office: 823 Days
• Field of Search: 202/217, 202/221, 202/222, 202/239, 202/270, 202/242, 202/244, 202/245, 202/246, 202/247, 202/248, 202/251, 202/252, 202/253, 494/53, 137/15.23, 137/315.13, 137/315.19, 137/315.2, 137/315.29, 137/315.3, 137/315.31, 137/315.32
• 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. In a coke drum de-heading system having at least one coke drum containing manufactured coke, a de-header valve removably coupled to the coke drum and configured to facilitate a removal of coke from the coke drum by de-heading the coke drum and allowing the coke to pass therethrough, and an exchange system including an upper and a lower bonnet, a method for selectively reducing an amount of steam lost from the coke de-heading device as it is being throttled and preventing debris from being deposited into a bonnet, the method comprising:

using a shroud to selectively surround a linear blind gate valve of a coke de-heading system as a blind is placed in a closed position, thereby containing any released steam or coke debris and preventing the debris from being deposited into a valve bonnet; and

slidably engaging a blind seal of a blind seal assembly against the blind to prevent a flow of the steam thereby.

2. A method as recited in claim 1, wherein the blind is configured to selectively slide between an opened position and the closed position.

3. A method as recited in claim 2, allowing a shroud cap end plate of the shroud to overcome a biasing pressure from one or more shroud cap return springs and release steam pressure from a valve body into the shroud when the blind is in the closed position.

4. A method as recited in claim 3, wherein allowing the one or more shroud cap return springs to bias the shroud cap end plate and to prevent a release of the steam pressure from the valve body into the shroud when the blind is in the opened position.

5. A method as recited in claim 1, wherein the de-heading 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 method as recited in claim 1, further comprising using a gate seal assembly to reduce an amount of steam from escaping from a body of the blind gate valve when the body is pressurized, wherein the gate seal assembly is coupled to the body of the blind gate valve and floats within a guide cup.