US3372648A - Pump - Google Patents

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Publication number
US3372648A
US3372648A US563253A US56325366A US3372648A US 3372648 A US3372648 A US 3372648A US 563253 A US563253 A US 563253A US 56325366 A US56325366 A US 56325366A US 3372648 A US3372648 A US 3372648A
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United States
Prior art keywords
pump
cylinder
bore
crosshead
hollow piston
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
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US563253A
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English (en)
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Hammelmann Paul
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Individual
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Individual
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Classifications

    • 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
    • F04B53/109—Valves; Arrangement of valves inlet and outlet valve forming one unit
    • 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
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes

Definitions

  • a pump including a reciprocatable crosshead having a front portion in form of a cylinder, a stationary hollow piston extending into the cylinder of the c-rosshead coaxially arranged therewith, and a pair of valves respectively arranged in a pair of passage means communicating with the interior of said hollow piston and respectively opening and closing during movement of said crosshead along a suction stroke and a compression stroke.
  • the present invention relates to a pump and more specifically to a pump head for pressure pumps or the like.
  • Pump heads are known in which the piston of the pump is reciprocated, for instance by means of a crosshead, in a pump cylinder for producing an over-respectively underpressure in the latter.
  • the pump according to the present invention mainly comprises support means and crosshead means guided in the support means for reciprocating movement.
  • the crosshead means has a front portion in the form of a cylinder and this cylinder 3,372,648 Patented Mar. 12, 1968 has an end wall closing the cylinder at the end thereof joined to the remainder of the crosshead means.
  • the pump comprises further a hollow piston means fixedly mounted on the support means and extending coaxially with the cylinder from the other end thereof into the latter.
  • Moving means are also provided connected to the crosshead means for reciprocating the latter along a suction stroke and an opposite pressure stroke and the pump comprises further first passage means communicating with the interior of the hollow piston means for feeding fluid to be pumped .thereinto, suction valve means in the first passage means, second passage means communicating with the interior of the hollow piston means for discharging pressure fluid therefrom, and pressure valve means in the second passage means.
  • the suction. valve means and the pressure valve means are arranged and constructed so that the suction valve means opens said first passage means during the suction stroke of the crosshead and the cylinder formed by the front portion thereof, while the pressure valve means is closed, and so that the pressure valve means is opened during the pressure stroke while the suction valve means is closed.
  • the support means are preferably in the form of a housing provided with a bore wherein the crosshead means is slidably guided and the hollow piston means are fixedly arranged in the bore coaxial with the cylinder portion of the crosshead means, whereas the first and second passage means are at least in part formed in the housing.
  • the pressure and suction valve means are respectively arranged in the interior of the hollow stationary piston means and about one portion of the latter.
  • the arrangement includes also annular sealing means between the stationary hollow piston means and the movable cylinder and the annular sealing means are either connected to the end of the hollow piston means facing the end wall of the cylinder or to the free end of the cylinder facing away from the end wall thereof.
  • the bore through the housing is formed, intermediate the portion thereof in which a part of the hollow piston means is tightly fitted and another axially spaced portion in which the crosshead means is slidably guided, with an enlarged diameter portion forming a receiving chamber and passage means are provided leading from the side of the sealing means facing the other end of the cylinder to the receiving chamber so that fluid leading through the sealing means may pass into the receiving chamber.
  • the latter is connected by a passage either to the atmosphere or to the suction space of the pump so that a mixing of the pumped medium with the lubricating oil. of the drive for the pump is positively avoided.
  • an elongated member may be removably fixed at one end thereof to the end wall of the cylinder projecting therefrom into the hollow piston means.
  • an annular sealing means may be provided between the elongated member and the hollow piston means, which sealing means is fixed to the other end of the elongated member.
  • the bore in the housing may be provided with means forming an annular shoulder between opposite ends of the bore and the hollow piston means is preferably formed intermediate its ends with a corresponding shoulder engaging said shoulder in the bore.
  • This arrangement preferably includes a screw plug threadingly connected to one end of the bore for closing the latter and the end of the hollow piston means adjacent said one end of the bore and for pressing the shoulder of the piston means against the means forming the shoulder in the bore, so that the hollow piston means is removable from the bore upon unscrewing of the screw plug.
  • FIG. 1 is a longitudinal cross section through the pump of the present invention.
  • FIG. 2 is a partial cross sectional view of the pump head of the pump, drawn to an enlarged scale.
  • the pump according to the present invention includes a crank casing 1 in which a crank shaft 2 is mounted on bearings of known construction not illustrated in FIG. 1.
  • the crankshaft 2 is driven by any conventional means not shown in the drawing and located outside of the casing 1.
  • the crankshaft 2 is connected by means of a connecting rod 3 and a bolt 4 extending transversely through an end of the connecting rod distant from the crankshaft to a crosshead 5.
  • the crosshead 5 has preferably a cylindrical outer surface and is formed at the front portion thereof facing away from the crankshaft 2 as a hollow cylinder 5a.
  • the cylindrical crosshead 5 is guided for reciprocating movement imparted thereto by the rotating crankshaft 2 in a bore of a housing 8.
  • the housing 8 is connected by screws, as shown in FIG. 1, to the crankshaft casing 1.
  • Stationary hollow piston means are provided in a portion of the aforementioned bore axially spaced from the bore portion in which the crosshead 5 is guided and the hollow piston means are preferably formed from three parts 7, 11 and 12, as best shown in FIG. 2, which abut with end faces thereof against each other.
  • the part 7 of the hollow piston means has a rear portion of the diameter substantially equal to the diameter of the bore so as to fit tightly therein, whereas the front portion of the part 7 has a reduced diameter portion which projects into the cylinder 5a formed on the crosshead 5.
  • the bore portion in which the enlarged portion of the part 7 is arranged is formed with an annular groove in which a two-part ring is located projecting beyond the inner surface of this bore portion and forming a shoulder therein, and the large diameter portion of the part 7 is formed with a corresponding shoulder abutting against the shoulder formed by the two-part ring 15.
  • a screw plug 7 is screwed in the end of the bore in the housing 8 and engages an end face of the part 12 so as to maintain the parts 12, 11 and 7 in abutting relationship and to press the shoulder on the part 7 against the shoulder formed by the two-part ring 15.
  • This arrangement provides not only for a perfect alignment of the hollow piston means 7, 11 and 12 with the crosshead 5 and the cylinder 5a formed thereon, but this arrangement permits also for an easy assembly and disassembly of the hollow piston means with the other parts of the pump head.
  • the part 11 is formed at the inner surface thereof with a first valve seat with which the valve member 19 of a suction valve cooperates.
  • the valve member 19 has a cylindrical portion projecting away from the valve seat which is guided for movement in axial direction in a corresponding cylindrical portion of a guide and support member 14 which has a plurality of arms clamped between correspondingly shaped ends of the parts 7 and 11.
  • a compression coil spring 13 abutting against the valve member 19 and the guide and support member 14- is biased so as to tend to maintain the valve member 19 in engagement with its valve seat.
  • the part 11 has distant from the part 7 a reduced diameter portion so as to form a shoulder between this reduced diameter portion and the remainder of the part 11, and an annular valve seat is provided on this shoulder with which the annular valve member 9 of a pressure valve cooperates.
  • the annular valve member 9 is pressed against its valve seat by a plurality of coil springs 10 partly housed in bores of the part .12 and engaging the annular member 9 so as to resiliently maintain the latter in abutment with its valve seat.
  • Passage means 18 provide communication between a supply of fluid, not shown in the drawing, and the cylindrical space defined by the hollow members 12 and 11, upstream of the suction valve 19.
  • Corresponding passage means lead from the space in the member 11 downstream of the suction valve 19 to the annular valve seat cooperating with the annular pressure valve member 9 and downstream of this pressure valve passage means lead to a reservoir or the like, not shown in the drawing, to which the fiuid pumped 'by the pump has to be supplied.
  • the pump arrangement of the present invention further includes annular sealing means between the cylinder 5a of the crosshead and the hollow piston means, respectively the part 7 thereof.
  • the annular sealing means may include as best shown in FIG. 2, an annular sealing member 6 of resiliently compressible material, which may have a cross section as shown in FIG. 2, and a threaded ring or bushing 25 threadingly connected to the part 7 in the region of the free end of the latter so that by adjusting the threaded bushing 25 in axial direction of the part 7 the compressible sealing member 6 may be compressed between the bushing 25 and a ring 25a held by a snap ring or the like in fixed position at the free end of the piston part 7.
  • annular sealing means may directly engage the inner surface of the cylinder 5a, but preferably, as shown in the drawing, an elongated bushing 23 is provided threadingly connected to a correspondingly threaded end of the cylinder 5a and snugly fitting into the latter so that the compressed resilient annular sealing member 6 is in sealing engagement with the outer surface of the part 7 and the inner surface of the bushing 23.
  • the inner surface of the bushing 23 has preferably a diameter slight ly larger than the outer surface of the part 7 extending thereinto so as to form a passage leading from the face of the threaded ring 25 which is opposite the face thereof engaging the annular sealing member 6 into portion of the bore in the housing 8 adjacent a portion of this bore of enlarged diameter forming a receiving chamber 7a.
  • the receiving chamber 7a communicates either by a passage, not shown in the drawing, with the outer atmosphere or through another passage 6a, with the interior of the part 11 upstream of the suction valve 19.
  • the above-described arrangement not only provides for a proper axial alignment of the crosshead 5 and the cylinder 5a formed thereon with the hollow piston means 7, 11 and 12 and the annular sealing means 6, 25, 25a on the part 7 of the hollow piston means, but the aforementioned described arrangement also permits easy assembly and disassembly of the various parts forming the pump head and inspection of the parts, respectively replacement thereof, if such replacement should become necessary.
  • the pump construction according to the present invention permits also to change the amount of fluid pumped during each pumping cycle in an extremely simple manner. This can, for instance, be accomplished by exchanging the part 7 of the hollow piston means and the annular sealing means thereon against corresponding parts of different diameter.
  • the elongated member 20 is preferably of cylindrical form having a diameter smaller than the inner diameter of the part 7.
  • the right end 20a, as viewed in FIG. 2, of the elongated member 20 preferably abuts against the end wall of the cylinder a and has a diameter substantially equal to the inner diameter of the cylinder so as to fit tightly therein.
  • the bushing 23 abuts with its right end, as viewed in FIG.
  • the left end, as viewed in FIG. 2, of the elongated member 20 has preferably a reduced diameter portion and annular sealing means comprising a bushing 22, at least one, or preferably two annular sealing members 21 of elastically compressible material and preferably of a cross section as indicated in FIG. 2, and a snap ring 24 holding the sealing members 21 and the bushing 22 against a shoulder of the elongated member 2%.
  • the annular sealing means 16, 21 and 22 provide a fluid-tight seal between the stationary part '7 of the hollow piston means and the member 20 which reciprocates with the crosshead means 5 and the cylinder 5a thereon.
  • the annular sealing means 6, 25 and 25a at the end of the part 7 of the hollow piston means may be omitted.
  • the delivery of the pump is reduced, while the pressure of the pumped fluid is increased.
  • the delivery of the pump without the elongated member 20 was 80 liters per minute at a pressure of 100 atmospheres, whereas during use of an appropriate elongated member 20 with the sealing means thereon the delivery of the pump was reduced to 40 liters per minute, whereas the pressure of the pumped fluid was increased to 200 atmospheres.
  • a pump in combination, support means; crosshead means guided in said support means for reciprocating movement, said crosshead means having a front portion in form of a cylinder, said cylinder having an end wall closing said cylinder at the end thereof joined to the remainder of said crosshead means, hollow piston means h fixedly mounted on said support means and extending from the other end of said cylinder into the latter coaxially arranged therewith; an elongated member having an end portion of larger diameter than the remainder thereof abutting against said end wall and projecting therefrom into said hollow piston means; a bushing threadingly connected at one end thereof to said other end of said cylinder and projecting from said connected end into said cylinder to engage with the other end thereof a face of said end portion facing away from said end wall for maintaining said end portion of said elongated member in abutment with said end wall; moving means connected to said crosshead means for reciprocating the same along a suction stroke and an opposite pressure stroke; first pasage means communicatin with the interior of said hollow piston for passage of fluid to
  • said support means are in the form of a housing and provided with a bore, said crosshead means being slidably guided in said bore, said hollow piston means being fixedly arranged in said bore coaxially with the cylinder portion of said crosshead means, and said first and second passage means being in part formed in said housing.
  • suction valve means and said pressure valve means are provided in said piston means and including annular sealing means between said cylinder of said crosshead means and said piston means.
  • annular sealing means fixed to the end of said hollow piston means facing said end wall of said cylinder and sealingly engaging with the outer surface thereof the inner surface of said bushing.
  • a pump in combination, support means in form of a housing provided with a bore; crosshead means slidably guided in said bore for reciprocating movement, said crosshead means having a front portion in form of a cylinder, said cylinder having an end Wall closing said cylinder at the end thereof joined to the remainder of said crosshead means; means in said bore of said housing forming an annular shoulder between opposite ends of said bore; hollow piston means extending from the other end of said cylinder into the latter coaxially arranged therewith and having intermediate its ends a shoulder engaging said annular shoulder in said bore; a screw plug threadingly connected to one end of said bore and closing the latter and the end of said hollow piston means adjacent said one end of said bore and pressing said shoulder of said piston means against said means forming said shoulder in said bore, said hollow piston means being removable from said bore upon unscrewing of said screw plug; moving means connected to said crosshead means for reciprocating the same along a suction stroke and an opposite pressure stroke; first passage means communicating with the interior of said hollow piston for passage
  • said hollow piston means is formed from three hollow cylindrical parts arranged coaxial with and abutting against each other in said bore, one of said three parts abutting against said means forming said shoulder in said bore, a second part abutting against said screw plug, and a third part being located between said first and said second part and being formed in the interior thereof with a first valve 8 seat and at the exterior thereof with a second annular valve seat, said suction valve means having a valve member cooperating with the first valve seat, and the pressure valve means having an annular valve member cooperating with said second annular valve seat.
  • suction valve means includes further a guide member held between abutting ends of said first and third part of said piston means for guiding said valve member in axial direction, and spring means between said valve member and said guide member and biassed so as to press said valve member against said first valve seat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Compressor (AREA)
US563253A 1965-07-07 1966-07-06 Pump Expired - Lifetime US3372648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1965H0056510 DE1528432A1 (de) 1965-07-07 1965-07-07 Pumpenkopf

Publications (1)

Publication Number Publication Date
US3372648A true US3372648A (en) 1968-03-12

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Application Number Title Priority Date Filing Date
US563253A Expired - Lifetime US3372648A (en) 1965-07-07 1966-07-06 Pump

Country Status (5)

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US (1) US3372648A (es)
DE (1) DE1528432A1 (es)
ES (1) ES328746A1 (es)
FR (1) FR1486776A (es)
GB (1) GB1156798A (es)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193744A (en) * 1978-03-27 1980-03-18 Nipak, Inc. Compressor valve
US4456439A (en) * 1980-11-06 1984-06-26 Speck-Kolbenpumpen-Fabrik High pressure plunger pump
US4551077A (en) * 1984-03-22 1985-11-05 Butterworth Inc. High pressure pump
US4576557A (en) * 1983-06-15 1986-03-18 Union Carbide Corporation Cryogenic liquid pump
US5171136A (en) * 1991-01-28 1992-12-15 Butterworth Jetting Systems, Inc. Fluid flow control device
US5253987A (en) * 1992-04-03 1993-10-19 Harrison Curtis W Fluid end for high-pressure fluid pumps
US6558141B2 (en) 2001-04-12 2003-05-06 Ingersoll-Rand Company Packing assembly and reciprocating plunger pump incorporating same
US20040161353A1 (en) * 2003-02-19 2004-08-19 Annovi Reverberi S.Pa. High pressure plunger pump
US20050201881A1 (en) * 2004-03-11 2005-09-15 Gardner Denver, Inc. Self-tightening cover for pump
US20070071614A1 (en) * 2005-09-29 2007-03-29 Denso Corporation Fluid pump having plunger and method of monoblock casting for housing of the same
US20110027106A1 (en) * 2008-07-30 2011-02-03 Maruyama Mfg Co., Inc. Reciprocating pump
WO2013160649A3 (en) * 2012-04-23 2013-12-19 Isentropic Ltd Piston assembly
US20250257722A1 (en) * 2019-11-18 2025-08-14 Kerr Machine Co. Fluid end

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2627956C2 (de) * 1976-06-22 1984-07-05 Paul 4740 Oelde Hammelmann Mehrteiliges Gehäuse einer mit einem Kurbeltrieb und einem Kreuzkopf ausgerüsteten Plungerpumpe
JPS6047479B2 (ja) * 1979-09-18 1985-10-22 有光工業株式会社 多連式往復動ポンプ
JPS5922303Y2 (ja) * 1979-09-18 1984-07-03 有光工業株式会社 往復動液体ポンプ
US5493953A (en) * 1994-11-14 1996-02-27 Thomas Industries Inc. Cylinder and piston for compressor or vacuum pump
WO1999025978A1 (de) * 1997-11-14 1999-05-27 Continental Teves Ag & Co. Ohg Kolbenpumpe

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1603675A (en) * 1926-06-22 1926-10-19 Robert H Folsom Oil-well pump
US1857026A (en) * 1929-05-02 1932-05-03 Robert A Ligon Booster pump for windmills
US2048098A (en) * 1933-08-09 1936-07-21 Bohnenblust Arnold Pump
US2274241A (en) * 1940-07-15 1942-02-24 Savarian F Lemanski Injector for internal combustion engines
DE915526C (de) * 1952-08-07 1954-07-22 Mauser Kg Pumpe mit querschnittveraenderbarer Kolbendichtung
US2732809A (en) * 1956-01-31 Liner assemblies
US2981198A (en) * 1958-08-12 1961-04-25 Nettel Frederick Reciprocating variable delivery pump
US3263622A (en) * 1964-06-01 1966-08-02 Jr Lewis Tyree Pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732809A (en) * 1956-01-31 Liner assemblies
US1603675A (en) * 1926-06-22 1926-10-19 Robert H Folsom Oil-well pump
US1857026A (en) * 1929-05-02 1932-05-03 Robert A Ligon Booster pump for windmills
US2048098A (en) * 1933-08-09 1936-07-21 Bohnenblust Arnold Pump
US2274241A (en) * 1940-07-15 1942-02-24 Savarian F Lemanski Injector for internal combustion engines
DE915526C (de) * 1952-08-07 1954-07-22 Mauser Kg Pumpe mit querschnittveraenderbarer Kolbendichtung
US2981198A (en) * 1958-08-12 1961-04-25 Nettel Frederick Reciprocating variable delivery pump
US3263622A (en) * 1964-06-01 1966-08-02 Jr Lewis Tyree Pump

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193744A (en) * 1978-03-27 1980-03-18 Nipak, Inc. Compressor valve
US4456439A (en) * 1980-11-06 1984-06-26 Speck-Kolbenpumpen-Fabrik High pressure plunger pump
US4576557A (en) * 1983-06-15 1986-03-18 Union Carbide Corporation Cryogenic liquid pump
US4551077A (en) * 1984-03-22 1985-11-05 Butterworth Inc. High pressure pump
US5171136A (en) * 1991-01-28 1992-12-15 Butterworth Jetting Systems, Inc. Fluid flow control device
US5253987A (en) * 1992-04-03 1993-10-19 Harrison Curtis W Fluid end for high-pressure fluid pumps
US6558141B2 (en) 2001-04-12 2003-05-06 Ingersoll-Rand Company Packing assembly and reciprocating plunger pump incorporating same
US20040161353A1 (en) * 2003-02-19 2004-08-19 Annovi Reverberi S.Pa. High pressure plunger pump
US8408886B2 (en) * 2003-02-19 2013-04-02 Annovi Reverberi S.P.A. High pressure plunger pump
US7506574B2 (en) 2004-03-11 2009-03-24 Gardner Denver, Inc. Self-tightening cover for pump
US20090172944A1 (en) * 2004-03-11 2009-07-09 Jensen Ernest J Self-tightening cover for pump
US7984671B2 (en) 2004-03-11 2011-07-26 Gardner Denver, Inc. Self-tightening cover for pump
US20050201881A1 (en) * 2004-03-11 2005-09-15 Gardner Denver, Inc. Self-tightening cover for pump
US20070071614A1 (en) * 2005-09-29 2007-03-29 Denso Corporation Fluid pump having plunger and method of monoblock casting for housing of the same
US8075287B2 (en) * 2005-09-29 2011-12-13 Denso Corporation Fluid pump having plunger and method of monoblock casting for housing of the same
US20110027106A1 (en) * 2008-07-30 2011-02-03 Maruyama Mfg Co., Inc. Reciprocating pump
US8366409B2 (en) * 2008-07-30 2013-02-05 Maruyama Mfg. Co., Inc. Reciprocating pump
WO2013160649A3 (en) * 2012-04-23 2013-12-19 Isentropic Ltd Piston assembly
US20250257722A1 (en) * 2019-11-18 2025-08-14 Kerr Machine Co. Fluid end
US12624684B2 (en) * 2019-11-18 2026-05-12 Kerr Machine Co. Fluid end

Also Published As

Publication number Publication date
DE1528432A1 (de) 1970-02-26
ES328746A1 (es) 1967-04-01
FR1486776A (fr) 1967-06-30
GB1156798A (en) 1969-07-02

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