Clifton D Eggleston

US Patent:

20100139928, Jun 10, 2010

Filed:

Dec 2, 2009

Appl. No.:

12/629553

Inventors:

Andrew Dale Riley - Eufaula OK, US
Clifton D. Eggleston - McAlester OK, US

Assignee:

NATIONAL OILWELL VARCO, L.P. - Houston TX

International Classification:

E21B 23/00
E21B 43/10

US Classification:

166382, 166208

Abstract:

A pump cylinder liner apparatus includes a replaceable sleeve captured between two cylinder hull portions that are releasably coupled to allow access to the sleeve for replacement. An elastomeric material or tube may be disposed between the sleeve and the two coupled hull portions for radial compressive pre-loading of the sleeve upon assembly and during operation.

US Patent:

20210301619, Sep 30, 2021

Filed:

Jul 31, 2019

Appl. No.:

17/264211

Inventors:

- Houston TX, US
Clifton Dee Eggleston - McAlester OK, US

Assignee:

National Oilwell Varco, L.P. - Houston TX

International Classification:

E21B 33/06

Abstract:

A blowout preventer including a housing including a central passage and a first aperture, and a first ram assembly slidably disposed in the first aperture, wherein the first ram assembly includes a ram block and an actuator configured to rotate the ram block when the ram block is disposed in the first aperture of the housing.

US Patent:

20190262844, Aug 29, 2019

Filed:

Mar 10, 2017

Appl. No.:

16/084074

Inventors:

- Houston TX, US
Mark Ernest Wolf - Katy TX, US
Clifton Dee Eggleston - McAlester OK, US

Assignee:

National Oilwell Varco, L.P. - Houston TX

International Classification:

B04C 5/22
B01D 17/02
B01D 17/12
B04C 5/28
B04C 11/00

Abstract:

A fluid separation apparatus includes a hydrocyclone () having an orifice () therein, a housing () disposed in the hydrocyclone and having a bore (), a piston () disposed in the bore () of the housing (), and a first annular seal () disposed between the housing () and the piston () and configured to restrict fluid communication between the housing () and the piston (), wherein the piston () includes a passage () extending through the piston () and having a pin () coupled to a first end () of the piston, the piston () being actuatable to move between a first position () where the pin () is clear of the orifice () of the hydrocyclone, and a second position where the pin () is disposed in the orifice (), wherein, the piston () is configured such that as the piston is actuated from the first position to the second position, fluid is permitted to flow into the passage () of the piston () from the bore () of the housing ().

US Patent:

20160131131, May 12, 2016

Filed:

Nov 7, 2014

Appl. No.:

14/536272

Inventors:

- Houston TX, US
Clifton Dee Eggleston - McAlester OK, US

Assignee:

National Oilwell Varco, L.P. - Houston TX

International Classification:

F04B 53/14
F16J 9/12
F16J 9/06

Abstract:

A wiper seal assembly for a reciprocating pump, the pump including a power section configured to be powered by a motor, a fluid section having an inlet and an outlet, and a plunger having a longitudinal plunger axis, a first end coupled to the power section, and a second end opposite the first end and disposed within the fluid section. The wiper seal assembly includes a cover mounted to the power section. In addition, the wiper seal assembly includes a first wiper seal radially disposed between the cover and the plunger. Further, the wiper seal assembly includes a splash guard disposed about the plunger and axially spaced from the cover. Still further, the wiper seal assembly includes a biasing member axially biasing the splash guard away from the first wiper seal.