[12] Patent
[11] Patent No.:GC0011507  
[45] Date of Publishing the Grant of the Patent: 30/Nov /2020                76/2020  
Number of the Decision to Grant the Patent:2020/175549
Date of the Decision to Grant the Patent:26/Nov/2020

[21] Application No.:GC 2015-30034

[22] Filing Date:15/9/2015

[30] Priority:

[33] State [32] Priority date [31] Priority No.
PCT
16/9/2014
PCT/US14/55862

[72] Inventor: Lane MCCASKILL

[73] Owner: NATIONAL OILWELL VARCO, L.P., 7909 PARKWOOD CIRCLE DRIVE, Houston, TEXAS 77036, USA

[74] Agent: Abu-Gazaleh Intellectual Property L.L.C

  

 

  

[51]IPC:
Int. Cl.: F16K 3/24, 47/08 (2006.01)

[56] Cited Documents:

-EP 2 756 949 A1 (CARTER PROCESS CONTROL
GMBH [AT]) 23 July 2014
-WO 2013/138092 A2 (T 3 PROPERTY HOLDINGS
INC [US]) 19 September 2013
-WO 00/09923 A1 (KENT INTROL LTD [GB] ;
SINGLETON EDWARD WHITELEY [GB])
24 February 2000
-JP 2009 209976 A (OSAKA GAS co LTD; KYOSEI
KK) 17 September 2009
 
Examiner: Eng. Fahad M. AlBaker

[54] MULTISTAGE STACKED DISC CHOKE
[57] Abstract: [0049] The invention provides an improved multistage stacked disc choke that can be manufactured from a sintering process. The choke includes a plurality of stacked disks that are produced in a “green” sintered state, then stacked, and sintered into a monolithic assembly. The stacked disk monolithic assembly is fitting into a steel cage with porting that aligns with porting on the outside surface of the stacked disks. A seat can be inserted into the steel cage and the assembly inserted into the choke. A plug is then able to be moved axially within the choke to adjust the opening and closing of the porting in the stacked disk assembly. The radial flow paths through the disks are offset from stage to stage, so that the flow impinges on surfaces as the flow progresses through the disks. The porting has a circular cross section to minimize wear and reduce stress risers.
No. of claims: 17     No. of figures: 6


 

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