US3363575A - Fluid pressure-driven multiplex pump - Google Patents
Fluid pressure-driven multiplex pump Download PDFInfo
- Publication number
- US3363575A US3363575A US522764A US52276466A US3363575A US 3363575 A US3363575 A US 3363575A US 522764 A US522764 A US 522764A US 52276466 A US52276466 A US 52276466A US 3363575 A US3363575 A US 3363575A
- Authority
- US
- United States
- Prior art keywords
- piston
- pump
- fluid
- cylinder
- driven
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 title description 35
- 238000005086 pumping Methods 0.000 description 8
- 230000010349 pulsation Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L33/00—Rotary or oscillatory slide valve-gear or valve arrangements, specially adapted for machines or engines with variable fluid distribution
- F01L33/04—Rotary or oscillatory slide valve-gear or valve arrangements, specially adapted for machines or engines with variable fluid distribution oscillatory
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
- F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
- F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
- F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
- F01L25/063—Arrangements with main and auxiliary valves, at least one of them being fluid-driven the auxiliary valve being actuated by the working motor-piston or piston-rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/02—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 having movable cylinders
- F04B19/022—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 having movable cylinders reciprocating cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1002—Ball valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/111—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
- F04B9/113—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting liquid motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
Definitions
- This invention relates to multiplex, double-acting, piston-type pumps, and more particularly to such pumps Which are hydraulically driven and which are especially suitable for pumping mud and for other services in the drilling of oil and gas wells.
- Prior art mud pumps are generally crank-driven. Such pumps, even though extensively employed, are undesirable because they are relatively heavy, bulky and ineliicient. Moreover, the ow velocity in such pumps periodically pulsates substantially, causing undesirable periodic pressure surges. To prevent failures in the hydraulic lines and associated equipments, which may be caused by these surges, heavier gage materials and Ihose are required. Also, the variations induced by the surges and pulsations are damaging to the pumps and the connected equipment.
- Another objects of this invention are to provide new and improved hydraulically-driven, duplex, double-acting pumps which are compact in design, which require a minimum of moving parts, which have a long operating life, which have a substantially constant flow velocity, which are relatively free of pressure surges, which are light weight, which can be driven and controlled from remote locations, and which are especially suitable for use in performing well drilling operations.
- a new and improved duplex pump having two double acting pump units.
- the piston in each pump unit is driven by a iiuid, preferably a hydraulic fluid, alternately applied to the opposite faces of the piston. Pressure or velocity surges are minimized by establishing a suitable phase shaft between the positions of the pistons on their stroke trajectories.
- An important object of this invention is the provision of a reciprocating pump employing a novel expansible and contractible pump chamber construction providing a high degree of pumping eflciency.
- a more specific object is the provision pressure-driven, duplex, double-acting, pump wherein each pump unit employs a single main piston having tubular extensions projecting coaxially from the opposite ends of the piston and slidably reciprocable over tubular cylinder sleeves closed at their outer ends to dene with said extensions pump chambers which are expansible and contractible in response to the reciprocation of the main pistons, the outer ends of the cylinder sleeves being closed by cylinder heads carrying the intake and exhaust valves for the respective pump chambers.
- FIG. 1 is a longitudinal cross-sectional view, partially diagrammatic, of a pump in accordance with this invention
- FIG. 2 is a view similar to that of FIG. l except that the pistons are shown in positions displaced from their positions in FIG. 1;
- FIG. 3 is a top plan view of the pump shown in FIGS. 1 and 2;
- FIG. 4 is an end view taken along line 4-4 of FIG. 3;
- FIG. 5 shows plots of the ow velocity from each pump unit and the resultant action thereof as a function of time
- FIG. 6 shows for comparison with FIG. 5, similar plots for a conventional duplex crank-operated pump.
- Pump unit 11 comprises a main or power cylinder 12 in which is reciprocably disposed a solid cylindrical piston 13 having mounted about its periphery a pair of seal rings 14 for slidable sealing engagement with the wall of cylinder 12.
- Integral with and extending from the opposite end faces of piston 13 are two tubular extensions 15 and 16 which are concentric with but sufticiently spaced from the inner wall of cylinder 12 to define therewith a pressure chamber 17.
- Two annular end caps 18 and 19, respectively, provided with O-rings 20, 21 and with seals 22, 23 make the chamber 17 uid-tight about extensions 15 and 16.
- Two passages or ports 24, 25 are provided in caps 18, 19, respectively communicating with the portions of chamber 17 on opposite sides of piston 13.
- Snugly fitted inside piston extensions 15, 16 are cylinder sleeves 26, 27, respectively, over which extensions 15 and 16 are slidably reciprocable in response to the reciprocations of piston 13.
- the space inside eX- tension 15 and cylinder sleeve 26 defines a pump chamber 28.
- Chamber 28 is made fluid-tight at its outer end lby a cylinder head 30 having a seal 31 and lbolted to the outer end of sleeve 26.
- a stuffing box 32, fitted with packings 33, provided in the outer end of piston extension 15 forms a slidable seal between the piston extension and sleeve 26.
- Chamber 29 is sealed olf at its outer enclin a similar manner by means of a cylinder head 34 having a seal 35 bolted to the outer end of sleeve 27.
- a stuffing box 36, fitted with packing 37, provided in the outer end of piston etxension 16 forms a slidable seal between this piston extension and sleeve 27.
- the cylinder heads 30, 34 rest on shoulders provided on bolts 38 and are securely held in place by nuts 41.
- Cylinder head 30 has an inlet port 42 and an outlet port 43 communicating with chamber 28, and cylinder head 34 has an inlet port ad and an outlet port 45 in communication with chamber 29.
- Inlet ports yd2, 44 are provided With back-check valves d6, 4S, respectively.
- outlet ports 43, 45 are provided with backcheck valves 47, 49, respectively.
- An intake conduit 90 4for fluid to be pumped, such as drilling mud, is provided with lateral branches 91, 92 connected to inlet ports 42, 44, respectively, and with other lateral branches 91', 92' which connect to inlet ports 42', 44 of the pump unit 11.
- a common discharge conduit 9d has later-al Ibranches 95, 96 communicating, respectively, with discharge ports d3, 45 and branches 95' and 96, communicating with discharge ports 43 and 45.
- a tank of hydraulic fluid 6 To hydraulically drive the pistons 13, 13', there is provided a tank of hydraulic fluid 6).
- a pump 61 feeds, .at a constant pressure, the fluid from tank 6d into a main supply line 62. T he'fluid is returned to the tank by a main return line 63.
- Main supply line 62 and return line 63 communicate, through appropriately manifolded connections, indicated by the letter M, with ports 24, 25 and 24', 2S', which are in communication, respectively, with cylinders 12 and 12 of the respective pump units.
- Pump 61 can be said to provide a uni-directional of direct pressure (by analogy to direct current). Before this direct pressure can be employed to drive pistons 13, 13', it must -be converted into a bi-directional or alternating pressure. This conversion is accomplished by the use of four 4-way valves, namely, two master valves and two control valves appropriately installed in manifold M to permit selectively directing the flow of power fluid to and from the opposite end portions of cylinders 12 and 12', as will appear hereinafter. These valves are wellknown in the art and can be obtained from several manufacturers.
- Piston 13 is driven through a spool-type master valve 64 having a slide-ble spool 65, the position of which is hydraulically controlled by a plug-type control valve 66 having a rotatable spool 67.
- Piston 13' is driven through a spool-type master valve 63 having a slidable spool 69, the position of which is hydraulically controlled by a spool-type control valve 76 having a slidable spool 71.
- Extending from spool 71 is a rod 72 having two spaced stops 73, 73' protected by two springs 74, 74', respectively.
- a tripping arm 75 Fixedly attached to piston extension 16' and movable therewith is a tripping arm 75 provided with a cylindrical opening 77 for allowing arm 75 to slide over rod 72.
- the free end of arm 75 is rbevelled to form a tripping iinger 78.
- the spool 71 can assume only two stable positions, as is well-known. It vassumes its righthand position when arm 75 hits spring 74 on stop 73 and its left-hand position when arm 75 hits spring 74 on stop 73', as shown in FIG. 2.
- the shaft 79 of the plugtype valve 66 is terminated with a circular operator 8@ having a V-shaped notch 81 cut therein (see FIG. 3).
- spool 67 assumes its stable position as shown in FIG. 2. Just before arm 75 reaches its mid-position moving from left to right,
- a pump 61 delivers at a constant velocity a power Huid, preferably a hydraulic fluid, from a tank 60 to a supply line 62.
- the fluid in line 62 is at a substantially constant pressure.
- pistons 13, 13' and the spools 65, 67, 69 and 71 are in their positions as shown in FIG. 2.
- the power fluid then tiows in the directions indicated by the arrows. Piston 13 starts moving to the right and piston 13 continues moving to the left from the mid-position.
- piston 13 moves to the left from its righthand position, as shown in FIG. l, chamber 29 expands allowing mud from branch 92 to enter chamber 29 through the inlet valve d8. During this suction action, valve 49 remains closed. Also, when piston 13 moves to the left, piston extension 15 slides over cylinder sleeve 26 thereby compressing the iiuid in chamber 28 and causing it to exit through the exhaust valve 47. Valve 46 remains closed during this compression action. When piston 13' reaches its mid-position, moving from right-toleft, piston 13' will have reached its left-hand position, as shown in FIG. 2.
- FIG. 5 is a chart plotting iiow velocity versus time during one complete cycle of the duplex pump in accordance with this invention as heretofore described, curve a displaying the parameter for pump unit 11 and curve b for -pump unit 11'.
- Curve R is the resultant of the pumping actions of the two units, showing that the flow velocity is substantially constant and at a maximum throughout the entire pumping period and that such pulsations as occur are extremely short in time and of very small magnitude.
- FIG. 6, which illustrates the corresponding pumping action, through one cycle of a conventional crank-driven, duplex, double-acting piston pump, clearly shows the large pulsations which occur in the resultant flow velocity of this conventional type of pump as contrasted with the smooth flow obtained with the pump in accordance with this invention.
- a duplex pump system having an inlet and an outlet comprising: at least two cylinders, a piston in each cylinder, a tubular extension projecting from each face of each piston, cap means defining a fiuid-tight chamber between the inner wall of each cylinder and the outer walls of the related pair of extensions, liuid passages communicating with each chamber on opposite sides of each piston, a stationary tubular sleeve member for each piston extension, end -means including valve means terminating one free end of each sleeve member, said piston extensions being arranged to reciprocate over their corresponding tubular sleeve members in response to pressure alternately applied through said passages and exerted on the annular portions of the opposite sides of said piston positioned in said chamber, said reciprocating piston extensions creating alternate compressions and suctions in said tubular sleeve members for pumping through said valve means a fluid from said inlet to said outlet, conduit means for supplying hydraulic pressure iiuid to said passages, and control means for said conduit means responsive
- said converting means include four-way valve means having movable spools therein, and wherein said responsive means control the positioning of said spools relative to each other and to the position of said pistons in said cylinders.
- a pump system having an inlet and an outlet comprising: a pump body, at least two pump units in said body, each unit including a cylinder, a solid cylindrical piston in said cylinder having two fiat faces; each piston face having a tubular extension axially aligned with and spaced from the inner wall of said cylinder; first end cap means at each end of said cylinder and defining between the inner wall of said cylinder and the outer walls of said extensions a fluid-tight chamber; said first end cap means including sealing means and having a port for accepting iiuid under pressure; a stationary sleeve member snugly iitting in each extension; seCOnd tPnd cap means at one end of each sleeve member and including an inlet port and an exhaust port; a source of hydraulic fluid under pressure, a driving four-way valve supplying an alternating flow of power fiuid to said chamber on either side of said piston; a control four-way valve coupled to said source and to said driving valve for timing the operation of said driving valve in each of
- a fluid pressure-driven pump comprising, two pump units, each unit including, a cylinder, an annular piston reciprocable in said cylinder, tubular extensions projecting from opposite end faces of said piston coaxially of said cylinder, means sealing between the inner wall of said cylinder and said extensions on opposite sides of said piston to define a pressure chamber therebetween, fiuid passages communicating with the portions of said chamber on opposite sides of said piston, a stationary cylinder sleeve having a closed outer end and having its inner end extending coaxially into the bore of each of said exten-- sions and cooperating therewith to define pump chambers which are expansible and contractible in response to reciprocation of said piston, valved intake and discharge passages communicating with each of said pump chambers, intake conduit means communicating the intake passages of all of said units to a common fluid inlet, discharge conduit means communicating the discharge passages of all of said units to a common discharge outlet, power fluid conduit means communicating the corresponding fluid passages of the cylinders of the several units with each other and with a source of
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US522764A US3363575A (en) | 1966-01-24 | 1966-01-24 | Fluid pressure-driven multiplex pump |
GB54882/66A GB1149090A (en) | 1966-01-24 | 1966-12-07 | Fluid pressure-driven pump |
BE692546D BE692546A (id) | 1966-01-24 | 1967-01-12 | |
FR91154A FR1507935A (fr) | 1966-01-24 | 1967-01-13 | Pompe entraînée par pression de fluide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US522764A US3363575A (en) | 1966-01-24 | 1966-01-24 | Fluid pressure-driven multiplex pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US3363575A true US3363575A (en) | 1968-01-16 |
Family
ID=24082245
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US522764A Expired - Lifetime US3363575A (en) | 1966-01-24 | 1966-01-24 | Fluid pressure-driven multiplex pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US3363575A (id) |
BE (1) | BE692546A (id) |
FR (1) | FR1507935A (id) |
GB (1) | GB1149090A (id) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3711224A (en) * | 1971-02-16 | 1973-01-16 | Borg Warner | Fluid powered expansion engine |
US3779671A (en) * | 1972-01-28 | 1973-12-18 | R Lybecker | Hydraulic driven piston pump |
US4543044A (en) * | 1983-11-09 | 1985-09-24 | E. I. Du Pont De Nemours And Company | Constant-flow-rate dual-unit pump |
US4846634A (en) * | 1987-12-14 | 1989-07-11 | Ingersoll-Rand Company | Water to emulsion transformer |
US5588808A (en) * | 1994-12-08 | 1996-12-31 | Hytech Pumps International, Inc. | Pump pressure multiplier |
FR2841611A1 (fr) * | 2002-06-27 | 2004-01-02 | Michel Magnoler | Dispositif d'amplification hydraulique pour un systeme de pompage a haute pression |
US20060099087A1 (en) * | 2004-11-10 | 2006-05-11 | Halliburton Energy Services, Inc. | Double-acting, duplex pump controlled by two, two position spool valves |
US20080260551A1 (en) * | 2007-01-26 | 2008-10-23 | Walter Neal Simmons | Rolling diaphragm pump |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE955502C (de) * | 1953-05-03 | 1957-01-03 | Bataafsche Petroleum | Verfahren zur Herstellung von Anlagerungsverbindungen aus Hexachlorcyclopentadien und Naphthalin bzw. Anthracen |
GB2162590B (en) * | 1984-07-10 | 1988-02-10 | Dale | Hydraulically driven pumps |
FR2573487B1 (fr) * | 1984-11-16 | 1988-11-18 | Elf Aquitaine | Pompe volumetrique a double effet |
GB2175352A (en) * | 1985-05-14 | 1986-11-26 | Coal Ind | Hydraulic pulseless supply means |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US342528A (en) * | 1886-05-25 | Boiler-feeder | ||
US2866415A (en) * | 1953-07-15 | 1958-12-30 | Bratt John | Hydraulic transformers |
US2938465A (en) * | 1953-08-31 | 1960-05-31 | Arthur E Mcfarland | Combined high and low pressure pumping apparatus |
US3183840A (en) * | 1962-08-03 | 1965-05-18 | Lynes Inc | Pump |
US3249053A (en) * | 1961-10-30 | 1966-05-03 | Farrel Corp | Control system for hydraulic pumps and intensifiers |
-
1966
- 1966-01-24 US US522764A patent/US3363575A/en not_active Expired - Lifetime
- 1966-12-07 GB GB54882/66A patent/GB1149090A/en not_active Expired
-
1967
- 1967-01-12 BE BE692546D patent/BE692546A/xx unknown
- 1967-01-13 FR FR91154A patent/FR1507935A/fr not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US342528A (en) * | 1886-05-25 | Boiler-feeder | ||
US2866415A (en) * | 1953-07-15 | 1958-12-30 | Bratt John | Hydraulic transformers |
US2938465A (en) * | 1953-08-31 | 1960-05-31 | Arthur E Mcfarland | Combined high and low pressure pumping apparatus |
US3249053A (en) * | 1961-10-30 | 1966-05-03 | Farrel Corp | Control system for hydraulic pumps and intensifiers |
US3183840A (en) * | 1962-08-03 | 1965-05-18 | Lynes Inc | Pump |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3711224A (en) * | 1971-02-16 | 1973-01-16 | Borg Warner | Fluid powered expansion engine |
US3779671A (en) * | 1972-01-28 | 1973-12-18 | R Lybecker | Hydraulic driven piston pump |
US4543044A (en) * | 1983-11-09 | 1985-09-24 | E. I. Du Pont De Nemours And Company | Constant-flow-rate dual-unit pump |
US4846634A (en) * | 1987-12-14 | 1989-07-11 | Ingersoll-Rand Company | Water to emulsion transformer |
US5588808A (en) * | 1994-12-08 | 1996-12-31 | Hytech Pumps International, Inc. | Pump pressure multiplier |
FR2841611A1 (fr) * | 2002-06-27 | 2004-01-02 | Michel Magnoler | Dispositif d'amplification hydraulique pour un systeme de pompage a haute pression |
WO2004003383A1 (fr) * | 2002-06-27 | 2004-01-08 | Michel Magnoler | Dispositif d'amplification hydraulique pour un systeme de pompage a haute pression |
US20060099087A1 (en) * | 2004-11-10 | 2006-05-11 | Halliburton Energy Services, Inc. | Double-acting, duplex pump controlled by two, two position spool valves |
US7713033B2 (en) * | 2004-11-10 | 2010-05-11 | Halliburton Energy Services, Inc. | Double-acting, duplex pump controlled by two, two position spool valves |
US20080260551A1 (en) * | 2007-01-26 | 2008-10-23 | Walter Neal Simmons | Rolling diaphragm pump |
Also Published As
Publication number | Publication date |
---|---|
BE692546A (id) | 1967-07-12 |
GB1149090A (en) | 1969-04-16 |
FR1507935A (fr) | 1967-12-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HUGHES TOOL COMPANY A CORP. OF DE Free format text: MERGER;ASSIGNOR:BROWN OIL TOOLS, INC. A TX CORP.;REEL/FRAME:003967/0348 Effective date: 19811214 |