| Patent Number |
Title Of Patent |
Date Issued |
| 8262367 |
Fault-tolerant chemical injection system for oil and gas wells |
September 11, 2012 |
| A metering body for a chemical injection system comprises a free piston having a pair of mechanically-actuated poppet valves which may individually open to permit fluid to pass from one side of the free piston to the other. The free piston slides within a cylinder having cylinder hea |
| 7520291 |
Pressure-compensated, subsea chemical injection valve |
April 21, 2009 |
| A backpressure-protected valve suitable for subsea well treatment chemical injection applications includes an improved gate valve, a check valve and a pressure compensator responsive to ambient hydrostatic pressure. The check valve may comprise a poppet valve in a detachable outlet body. |
| 7159616 |
Dual path hydraulic coupling |
January 9, 2007 |
| A female hydraulic coupling member is disclosed which comprises a first flow port; a second flow port; a third flow port in fluid communication with both the first flow port and the second flow port; a first poppet valve for opening and closing the first flow port; and a second poppet |
| 6983922 |
Piloted directional control valve |
January 10, 2006 |
| An electrically powered rotary solenoid drives a hydraulic pilot valve to actuate a hydraulic main valve. The pilot valve includes a seal carrier rotatable with respect to a seal plate. A carrier supply port and a plate supply port are centered about an axis of rotation to remain in flui |
| 6983803 |
Equalizer valve and associated method for sealing a fluid flow |
January 10, 2006 |
| A dirty fluid valve for sealing high differential fluid pressures in a drilling environment and methods for using such a valve is disclosed. One embodiment of the valve includes a seal cartridge having several openings for directing a fluid path through the cartridge, a spring connected |
| 6973936 |
Fluid injection system |
December 13, 2005 |
| A fluid injection system controls the distribution of fluid from a supply line to a selected well at an adjustable rate. A fluid barrier divides a cylinder into first and second chambers. A multi-position valve comprises a first position for passing fluid from the supply line into the fi |
| 6745838 |
Chemical injection control system and method for multiple wells |
June 8, 2004 |
| The chemical injection system (10) is provided for controlling the distribution of chemical fluid from a supply conduit (12) into an individual petroleum well at an adjustable rate. The system includes a remotely operated two position control valve (14) connected to the supply condui |
| 6651696 |
Relief valve |
November 25, 2003 |
| A relief valve with two outlet ports increases the flow capacity of the valve when open. In an alternative embodiment, a relief valve with two outlet ports also has at least two springs stacked vertically. Alternative seal assemblies can be used with the aforementioned dual outlet port |
| 6571822 |
Low blow down relief valve |
June 3, 2003 |
| A relief valve having blow down values of 5% or lower is disclosed. The low blow down values are the result of reducing friction within the relief valve. The relief valve includes a movable plunger. Clearance is provided whereby the plunger does not experience significant friction as it |
| 6568418 |
Precision regulator |
May 27, 2003 |
| The precision regulator connects to a high pressure fluid source and regulates the pressure to a downstream apparatus. If an overpressure occurs, it can be vented to atmosphere. An elongate control stem engages a supply seal assembly and a vent seal assembly and moves axially and past |
| 6527010 |
Single pilot dual pulse spool valve |
March 4, 2003 |
| A spool valve may be used in a subsea system with a single upstream pilot valve to control the spool valve. The spool valve opens and closes a main valve in response to fluid signals from the pilot valve. The main valve is connected to a source of pressurized supply fluid, which is selec |
| 6497251 |
Hydraulic latching spool valve |
December 24, 2002 |
| A hydraulic latching spool valve has at movable piston and valve cage defining two seats. In the valve cage, a moveable piston is operable to move the valve into open and closed positions. A spring positioned in a pilot close chamber urges the piston to close. A pulse of fluid pressure |
| 6318400 |
Low interflow hydraulic shuttle valve |
November 20, 2001 |
| The hydraulic shuttle valve has two coaxial supply ports and a transverse function port to direct fluid coming from alternative control sources to a blow out preventor (BOP). The valve includes a moveable shuttle with opposing tapered metal sealing surfaces to alternatively engage opposi |
| 5901749 |
Three-way poppet valve |
May 11, 1999 |
| A high pressure poppet valve having a valve body defining inlet, outlet and vent passages, and with a valve cage in sealed relation within the valve body which defines an internal seat projection having spaced circular seat shoulders. A seal carrier, which may be a pilot pressure respons |
| 5771931 |
High pressure wear resistant pilot valve |
June 30, 1998 |
| A reciprocating sleeve type valve mechanism having a valve housing within which is located a cage element. A piston, movably positioned within the valve housing, accomplishes linear opening movement of a cylindrical seal sleeve with respect to spaced polymer seals within the housing. Clo |
| 4856557 |
Sliding metal seal valve mechanism |
August 15, 1989 |
| A high pressure, low friction slide valve incorporates a valve body defining parallel spaced internal sealing surfaces and inlet, vent and function ports communicating with an internal valve chamber. A seal carrier is movable within the valve chamber and supports a seal cylinder for |
