EP2722526A1 - Hydraulische Kolbenpumpe - Google Patents

Hydraulische Kolbenpumpe Download PDF

Info

Publication number
EP2722526A1
EP2722526A1 EP13175531.6A EP13175531A EP2722526A1 EP 2722526 A1 EP2722526 A1 EP 2722526A1 EP 13175531 A EP13175531 A EP 13175531A EP 2722526 A1 EP2722526 A1 EP 2722526A1
Authority
EP
European Patent Office
Prior art keywords
pump
aspirating
pumping chamber
gap
conduit
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.)
Granted
Application number
EP13175531.6A
Other languages
English (en)
French (fr)
Other versions
EP2722526B1 (de
Inventor
Fulvio Montipo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Interpump Group SpA
Original Assignee
Interpump Engineering SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Interpump Engineering SRL filed Critical Interpump Engineering SRL
Publication of EP2722526A1 publication Critical patent/EP2722526A1/de
Application granted granted Critical
Publication of EP2722526B1 publication Critical patent/EP2722526B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F04B53/007—Cylinder heads
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the present invention is a hydraulic piston pump, in particular a high pressure hydraulic piston pump for industrial applications.
  • a hydraulic piston pump normally comprises a casing wherein a motorised shaft is rotatably supported, the shaft acting to drive a crank mechanism, of con rod-crank type, conferring an alternating motion to a piston.
  • the pump further comprises a hollow body, commonly called a pump head, fixed to the casing by screws. At least a cylindrical seating is formed inside the pump head wherein an alternating piston is slidingly housed, such as to define a variable volume pumping chamber.
  • a ring sealing element or a sealing element group Interposed between the piston and the cylindrical seating is at least a ring sealing element or a sealing element group, which ensures the seal of the pumping chamber.
  • some embodiments exhibit a cylindrical sealing element support bushing, coaxially interposed between the piston and the cylindrical seating.
  • the sealing element support bushing can be extracted and inserted through an opening afforded in the front of the pump head, the opening being in communication with the pumping chamber and normally closed with a removable cap or cover.
  • An aspirating conduit and a delivery conduit are also fashioned in the head, in communication with the pumping chamber respectively through an aspirating valve and a delivery valve.
  • the valves are generally realized as separate components, each normally comprising a valve body forming a fluid passage, a valve obturator located inside the valve body, and a spring acting to push the valve obturator towards a closed position of the fluid passage.
  • they are housed inside the pump head in openings formed in the pump head.
  • the opening housing the delivery valve is in communication with the delivery conduit, while the opening housing the aspirating valve is in communication with the pumping chamber. Both these openings are normally closed using a respective removable cap.
  • the aspirating conduit of the pumps is normally connected to a low pressure water supply network, at a pressure in the order of a few bar.
  • the delivery conduit is connected to user appliances or to devices operating at very high pressures, in some cases as high as thousands of bars.
  • the alternating piston cyclically performs an aspirating stroke followed by a delivery stroke.
  • the piston moves such as to increase the volume of the pumping chamber. This generates a pressure decrease inside the pumping chamber causing first a closure of the delivery valve and then an aspiration through the aspirating valve of additional fluid for pumping.
  • the piston compresses the fluid and increases the pressure in the pumping chamber, causing first a closure of the aspirating valve and then an exit of the fluid through the delivery valve.
  • the pressure in the pumping chamber varies cyclically between a very low value, zero or close to zero, substantially equivalent to the pressure of the fluid in the aspirating conduit, to a very high value, substantially equal to the pressure of the fluid in the delivery conduit.
  • This cyclic pressure variation in the pumping chamber generates a marked pulsed loading on the aspirating valve containing cap, and on the containing cap or cover of the sealing element support bushing (if present), and also on the screws fixing the pump head to the casing.
  • the pressure acting on the aspirating valve containing cap is generally equal to the pressure in the pumping chamber multiplied by the sealing surface area of the containing cap.
  • the thrust acting on the containing cap or cover of the sealing element support bushing is generally equal to the pressure in the pumping chamber multiplied by the section of the opening closed by the cap.
  • the pressure acting overall on the screws fastening the pump head to the casing is generally equal to the pressure acting on the aspirating valve containing cap, added to an additional force equal to the pressure in the pumping chamber multiplied by the section of the piston, and reduced only by the preloading at which the screws are tightened.
  • the force acting on these components may therefore vary between very low values close to zero during a piston aspiration stroke, and values as high as thousands of Newtons during a delivery stroke.
  • a pulsating load of this entity causes material fatigue phenomena that may lead to the breakage or loosening of the aspirating valve containing cap, of the containing cap of the sealing element support bushing (if present), and the pump head fixing screws, and can sometimes cause rapid wearing of the relative sealing elements.
  • An aim of the present invention is to obviate the problems mentioned herein above, by way of a simple, rational and relatively economical solution.
  • an embodiment of the present invention provides a hydraulic piston pump comprising a hollow body (pump head) internally forming an aspirating conduit, a delivery conduit, and at least a pumping chamber housing an alternating piston, the pumping chamber being separated from the aspirating conduit and the delivery conduit respectively by an aspirating valve and a delivery valve, the hollow body exhibiting at least a gap establishing communication between the pumping chamber and an exterior environment, the gap being closed with a closing element fixed to the hollow body; inside the gap a sealingly inserted separating element separates the pumping chamber from the closing element such that between the closing element and the separating element a gap is defined in hydraulic communication with the delivery conduit through a channel formed in the hollow body.
  • the gap closing element is always subjected to a pressure substantially equal to the pressure of the fluid in the delivery conduit.
  • this pressure can be relatively high, it generates a more or less constant pressure on the closing element, eliminating or at least significantly reducing phenomena of material fatigue.
  • This effect advantageously influences the screws fixing the hollow body (pump head) to the casing, since the screws are subjected only to the pulsating load deriving from the piston section.
  • the gap may be a seating in which the aspirating valve is housed
  • the separating element may be a spacing element interposed between the closing element and the aspirating valve, preferably a spacer element abuttingly blocked between the closing element and the aspirating valve.
  • the gap may be a seating for a sealing element support bushing internally of which the alternating piston is slidably inserted, and the separating element can close the bottom of the bushing, being interposed between the closing element and the piston head.
  • the separating element can be joined to the sealing element support bushing, for example by means of engaging means or realized in a single piece therewith.
  • the closing element of the gap can comprise a plate fixed to the external body (pump head) by means of screws, or can comprise a threaded portion used to directly screw the plate into the hollow body.
  • FIG. 1 illustrates a hydraulic piston pump 100, comprising a hollow body 105, commonly called a pump head, internally of which an aspirating conduit 110 and a delivery conduit 115 are fashioned for a fluid to be pumped. Also formed in the pump head 105 is at least a pumping chamber 120, generally defined by a substantially cylindrical blind seating 125 and two lateral conduits 130 and 135 able to establish communication between the cylindrical seating 125 and, respectively, the aspirating conduit 110 and delivery conduit 115.
  • the lateral conduits 130 and 135 are respectively intercepted by an aspirating valve 140 and a delivery valve 145, such as to selectively enable/inhibit communication between the pumping chamber 120 and the aspirating 110 and delivery 115 conduits.
  • the aspirating 140 and delivery 145 valves are automatic valves, each generally comprising a valve body A defining a passage for a fluid, an obturator element B housed inside the valve body A, and a spring or other elastic element C destined to push a obturator element B towards a position closing the passage.
  • the delivery valve 145 is housed, with interposing of at least a sealing element, internally of a respective cylindrical seating 150 formed in the pump head 105, such that the spring C acts on the obturator element B in contrast to the pressure in the pumping chamber 120.
  • the cylindrical seating 150 communicates with an exterior environment through a coaxial hole 155, afforded in the pump head 105, opening (from outside) directly into the delivery conduit 115.
  • this hole 155 is closed and sealed with a cap 160 also having the function of blocking the delivery valve 145 in a respective seating 150.
  • the hole 155 is internally threaded and the cap 160 exhibits a threaded shank which is screwed into the hole 155, with interposing of at least a sealing element.
  • the aspirating valve 140 is housed, with interposing of at least a sealing element, inside a respective cylindrical seating 165 formed in the pump head 105, such that the spring C acts on the obturator element B in contrast to the pressure in the aspirating conduit 110.
  • the cylindrical seating 165 communicates with an exterior through a coaxial hole 170, afforded in the pump head 105 and opening directly into a lateral conduit 130 and thus into the pumping chamber 120. During operation of the pump 100, this hole 170 is closed and sealed by a cap 175 which also blocks the aspirating valve 140 in the respective seating 165.
  • the hole 170 is internally threaded and the cap 175 exhibits a threaded shank that screws directly into the hole 170, with the interposing of at least a sealing element.
  • a substantially cylindrical spacer element 180 is interposed between the cap 175 and the aspirating valve 140.
  • the spacer element 180 is sealingly inserted into the cylindrical seating 165, with the interposing of a further sealing element.
  • the spacer element 165 is blocked by the cap 175 by abutting against a circular abutment formed between the aspirating valve 140 and the cap 175.
  • the spacer element 180 exhibits a shaping that partially receives the valve body A.
  • the spacer element 180 instead exhibits a central relief that contacts the cap 175 only on a very limited portion of the bottom surface of the cap 175. In this way, between the bottom of the cap 175 and the spacer element 180 a narrow annular gap 185 is defined in isolation from the pumping chamber 120.
  • the gap 185 is in direct communication with the delivery conduit 115 through an auxiliary conduit 190, formed inside the pump head 105.
  • the pump 100 further comprises an alternating piston 195 slidingly inserted into a cylindrical seating 125, such that the alternating movement of a piston 195 produces a variation in the internal volume of the pumping chamber 120.
  • a group of sealing elements are coaxially interposed between the piston 195 and relative cylindrical seating 125, which sealing elements ensure a seal of the pumping chamber 120.
  • the group of sealing elements is fixed to the cylindrical seating 125 and comprises at least two coaxial sealing elements acting at different points along the longitudinal development of the piston 195, and comprising a high pressure sealing element 200 and a low pressure sealing element 205.
  • the high pressure sealing element 200 is separated from the low pressure sealing element 205 by a spacer ring 210.
  • the spacer ring 210 affords a radial series of through-holes 215 in communication with the aspirating conduit 110 via at least a channel 220 afforded in the pump head 105. In this way, any small quantities of fluid that might leak through the high pressure sealing element 200, can be recovered and returned to the aspirating conduit 110.
  • the piston 195 partially projects externally of the pump head 105 and is slidingly housed inside a casing 225.
  • the casing 225 is fixed to the pump head 105 with suitable screws (not illustrated in figure 1 ).
  • a motorised shaft is rotatingly supported inside the casing 225, which drives a crank system, of a con rod-crank type, which drives the piston 195 in an alternating motion.
  • the piston 195 drive system is of widely known type.
  • the alternating piston 195 cyclically performs an aspirating stroke followed by a delivery stroke in the opposite direction.
  • the piston 195 moves in a direction of increasing the volume of the pumping chamber 120, until attaining the configuration of figure 1 .
  • the pressure in the pumping chamber 120 decreases, causing firstly the closure of the delivery valve 145, and then the opening of the aspirating valve 140, through which a certain quantity of fluid flows from the aspirating conduit 110 into the pumping chamber 120.
  • the piston 195 compresses the fluid and increases the pressure in the pumping chamber 120, causing firstly the closure of the aspirating valve 140, and then the opening of the delivery valve 145, through which the pressurized fluid reaches the delivery conduit 115.
  • the pressure in the pumping chamber 120 varies cyclically from a value close to zero, or at most very low, substantially equal to the pressure of the fluid in the aspirating conduit 110, to a very high value, substantially equal to the pressure of the fluid in the delivery conduit 115.
  • the pressure in the gap 185, between the cap 175 (for the retention of the aspirating valve 140) and the spacer element 180, is constantly equal to the pressure of the fluid in the delivery conduit 115.
  • the cap 175 is subjected to a force approximately equal to the pressure in the delivery conduit 115 multiplied by the sealing surface area of the cap 175, representing the transversal cross-section of the cap 175 at the gully that houses the sealing element.
  • the force can be relatively high, it remains constant during operation of the pump 100 and consequently the cap 175 is not subjected to phenomena of material fatigue which otherwise could cause failure or partial unscrewing of the cap 175, also compromising the seal of the pumping chamber 120.
  • Figure 2 is a hydraulic piston pump 300 in an alternative embodiment of the invention, differing from the previous embodiment only in the aspects described herein below. Apart from the differences described below, the pump 300 of figure 2 exhibits the same characteristics as the pump 100 described with reference to figure 1 . For this reason, the common characteristics are labelled in figure 2 using the same numeric references as figure 1 , and the descriptions of the common characteristics are assumed to be simple repetitions of the descriptions relating to figure 1 .
  • the cap 175 is in direct contact with the aspirating valve 140, such as to fix the aspirating valve 140 in a relative cylindrical seating 165.
  • the end of the threaded shank of the cap 175, which screws into the hole 170, exhibits a shaping that partially houses the valve body A.
  • a further aspect of diversity of the pump 300 is that between the piston 195 and the cylindrical seating 125, a substantially cylindrical bushing 305 is coaxially interposed, which holds the sealing elements or group of sealing elements that ensure the seal of the pumping chamber 120.
  • the bushing 305 is a beaker-shaped monolithic body, closed at an end thereof by a bottom wall 310.
  • the bushing 305 is coaxially snugly inserted in the cylindrical seating 125, with interposing of suitable sealing elements.
  • the lateral wall of the bushing 305 affords at least two diametrically-opposite holes, each facing a respective lateral conduit 130 and 135, such that the internal volume of the bushing 305 is an integral part of the pumping chamber 120.
  • the bushing 305 bears a high pressure sealing element 315, which is coaxially interposed between the bushing 305 and the piston 195.
  • This high pressure sealing element 315 is axially fixed between an abutment of the bushing 305 and an annular insert 320 coaxially inserted onto the free end of the bushing 305 where it is fixed by means of snap-fastening means.
  • a circumferential groove is fashioned on the internal surface of the annular insert 320 for housing a low pressure sealing element 325, which is coaxially interposed between the annular insert 320 and the piston 195.
  • the lateral walls of the bushing 305 and of the annular insert 320 afford openings which, overall, form a series of radial passages 330.
  • the radial passages 330 are in communication with the aspirating conduit 110 through the channel 220 formed in the pump head 105, such that any small quantities of fluid that leak through the high pressure sealing element 315 can be recovered and returned to the aspirating conduit 110.
  • the annular insert 320 could form a single body with the bushing 305.
  • the pump head 105 exhibits a front hole 335 coaxial to the cylindrical seating 125 and positioned on the opposite side to the casing 225.
  • the front hole 335 opens directly into the pumping chamber 120 and has a diameter that is equal to or greater than the diameter of the bushing 305.
  • the bottom wall 310 of the bushing 305 is sealingly inserted inside the front hole 335 by interposing an annular sealing element.
  • the front hole 335 is sealingly closed by a cover 340.
  • the cover 340 comprises a plate 345 fixed externally on the pump head 105 using lock screws 350, and a cylindrical shank 355, which snugly inserts into the front hole 335, using an interposed annular sealing element.
  • the cylindrical shank 355 may be free or simply supported on the plate 345, or it can be solidly fixed to the plate 345.
  • the cylindrical shank 355 is in contact with the bottom wall 310 of the bushing 305, such that the bushing 305 is axially blocked in the cylindrical seating 125.
  • the bottom wall 310 of the bushing 305 exhibits a central relief portion that contacts the shank 355 on only a limited portion of the bottom surface. In this way, a narrow annular gap 360 is formed between the end of the cylindrical shank 355 and the bottom wall 310 of the bushing 305, which gap 360 is isolated from the pumping chamber 120 by the bottom wall 310.
  • the gap 360 is in direct communication with the delivery conduit 115 through an auxiliary conduit 365 fashioned in the pump head 105.
  • the functioning of the pump 300 is entirely similar to the operation of the pump 100 described herein above with reference to figure 1 . Consequently, the pressure in the pumping chamber 120 varies cyclically between a very low value, zero or close to zero, substantially equal to the fluid pressure in the aspirating conduit 110, and a very high value, substantially equal to the fluid pressure in the delivery conduit 115.
  • the pressure in the gap 360, interposed between the cover 340 and the bottom wall 310 of the bushing 305, is constantly equal to the pressure of the fluid in the delivery conduit 115.
  • the cover 340 is subjected to a force approximately equal to the pressure in the delivery conduit 115 multiplied by the sealing surface of the cylindrical shank 355.
  • this pressure can be relatively high, the pressure remains constant throughout the operation of the pump 100 and thus the cover 340 and relative fixing screws 350 are not subject to phenomena of material fatigue, which otherwise could cause failure or partial unscrewing of this component, also compromising the seal of the pumping chamber.
  • Figure 3 illustrates a hydraulic piston pump 400 in an alternative embodiment of the present invention, differing from the pump 100 of figure 1 only in the aspects described herein below. Apart from the differences described below, the pump 400 of figure 3 exhibits the same characteristics as the pump 100 described with reference to figure 1 . Consequently, the common characteristics are labelled in figure 3 using the same numeric references as figure 1 , and the descriptions of the common characteristics are assumed to be simple repetitions of the descriptions regarding the first embodiment of the present invention.
  • a different aspect of the pump 400 compared to the pump 100 of figure 1 (but alike to the pump 300 of figure 2 ) is that a substantially cylindrical bushing 405 is interposed between the piston 195 and the cylindrical seating 125, bearing the sealing elements or sealing element group that ensure the seal of the pumping chamber 120.
  • the bushing 405 is realized from a cylindrical body open at both ends, one end closed by a bottom disc 410.
  • the bottom disc 410 is fixed to the bushing 405 using snap-fastening means, so that it is solidly fixed in at least the axial direction.
  • the bushing 405 is snugly inserted in the cylindrical seating 125, with the interposing of suitable sealing elements.
  • the lateral wall of the bushing 405 affords at least two diametrically opposite holes, each hole facing a respective lateral conduit 130 and 135, such that the internal volume of the bushing 405 is an integral part of the pumping chamber 120.
  • the bushing 405 bears a high pressure sealing element 415 which is coaxially interposed between the bushing 405 and the piston 195.
  • the high pressure sealing element 415 is axially blocked between an abutment of the bushing 405 and an annular insert 420, which is coaxially inserted on the end of the bushing 405 opposite the end disk 410, where it is blocked by snap-fastening means.
  • a circumferential gully is formed on the internal surface of the annular insert 420 such as to house a low pressure sealing element 425 which insert is coaxially interposed between the annular insert 420 and the piston 195.
  • the walls of the bushing 405 and of the annular insert 420 afford openings that overall define a series of radial passages 430.
  • the radial passages 430 are in communication with the aspirating conduit 110 through the channel 220 formed in the pump head 105, such that any small quantities of fluid that might leak through the high pressure sealing element 415 can be recuperated and returned to the aspirating conduit 110.
  • the annular insert 420 could be formed in a single body with the bushing 405.
  • the pump head 105 affords a front hole 435 coaxial to the cylindrical seating 125 and located on the opposite side with respect to the casing 225.
  • the front hole 435 opens directly into the pumping chamber 120 and exhibits a diameter equal to or greater than the diameter of the bushing 405 and relative bottom disc 410.
  • the bottom disc 410 is sealingly inserted into the front hole 435, using an interposed annular sealing element.
  • the front hole 435 is sealingly closed by a cover 440.
  • the front hole 435 is internally threaded and the cap 440 exhibits a threaded shank that screws directly into the front hole 435, using an interposed annular sealing element.
  • the end surface of the threaded shank is slightly spaced from the end disk 410 of the bushing 405. In this way, a narrow annular gap 450 is defined between the end of the threaded shank and the bottom disc 410, which gap 450 is isolated relative to the pumping chamber 120 by the end disk 410.
  • the gap 450 is in direct communication with the delivery conduit 115 via a first auxiliary conduit 455 formed inside the pump head 105 formed internally of the head 105.
  • the gap 450 is also in direct communication with the gap 185 between the cap 175 and the aspirating valve 140, via a second auxiliary conduit 460 formed in the pump head 10,. In this way, the gap 185 is also in direct communication with the delivery conduit 115.
  • the operation of the pump 400 is entirely analogous to the operation of the pump 100 described herein above with reference to figure 1 . Consequently, also in this case the pressure in the pumping chamber 120 varies cyclically between a very low value, zero or close to zero, substantially equal to the fluid pressure in the aspirating conduit 110, and a very high value, substantially equal to the fluid pressure in the delivery conduit 115. Notwithstanding this cyclic variation of pressure in the pumping chamber 120, the pressure in the gap 450, interposed between the cap 440 and the bottom disc 410 of the bushing 405, and the pressure in the gap 185, interposed between the cap 175 and the spacer element 180 of the aspirating valve 140, is constantly equal to the pressure of the fluid in the delivery conduit 115.
  • the cap 440 is subjected to a force approximately equal to the pressure in the delivery conduit 115 multiplied by the sealing surface of the threaded shank, while the cap 175 is subjected to a force approximately equal to the pressure in the delivery conduit 115 multiplied by the sealing surface of the relative threaded shank.
  • these thrust pressures can be rather high, the pressures remain constant throughout the operation of the pump 400 and thus the caps 440 and 175 are not subjected to phenomena of material fatigue, which otherwise might cause the failure or partial unscrewing of the components, also compromising the seal of the pumping chamber 120.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Valve Device For Special Equipments (AREA)
  • Reciprocating Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP13175531.6A 2012-10-19 2013-07-08 Hydraulische Kolbenpumpe Active EP2722526B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000073A ITRE20120073A1 (it) 2012-10-19 2012-10-19 Pompa idraulica a pistoni

Publications (2)

Publication Number Publication Date
EP2722526A1 true EP2722526A1 (de) 2014-04-23
EP2722526B1 EP2722526B1 (de) 2015-12-02

Family

ID=47428876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13175531.6A Active EP2722526B1 (de) 2012-10-19 2013-07-08 Hydraulische Kolbenpumpe

Country Status (2)

Country Link
EP (1) EP2722526B1 (de)
IT (1) ITRE20120073A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800020389A1 (it) * 2018-12-20 2020-06-20 Leuco Spa Dispositivo di pompaggio.
IT202000005557A1 (it) * 2020-03-16 2021-09-16 Comet Spa Testata rinforzata per una pompa volumetrica

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573886A (en) * 1979-10-06 1986-03-04 Woma-Apparatebau Wolfgang Massberg & Co. Gmbh Valve assembly for high pressure pump
EP0908627A2 (de) * 1997-10-08 1999-04-14 Annovi e Reverberi S.r.l. Ventileinheit für Hochdruckpumpen
EP1450045A1 (de) * 2003-02-19 2004-08-25 Annovi Reverberi S.p.A. Mehrzylindrige Hochdruckplungerpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573886A (en) * 1979-10-06 1986-03-04 Woma-Apparatebau Wolfgang Massberg & Co. Gmbh Valve assembly for high pressure pump
EP0908627A2 (de) * 1997-10-08 1999-04-14 Annovi e Reverberi S.r.l. Ventileinheit für Hochdruckpumpen
EP1450045A1 (de) * 2003-02-19 2004-08-25 Annovi Reverberi S.p.A. Mehrzylindrige Hochdruckplungerpumpe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800020389A1 (it) * 2018-12-20 2020-06-20 Leuco Spa Dispositivo di pompaggio.
EP3670904A1 (de) * 2018-12-20 2020-06-24 Leuco S.p.A. Pumpvorrichtung
CN111425368A (zh) * 2018-12-20 2020-07-17 莱乌科股份公司 泵送装置
CN111425368B (zh) * 2018-12-20 2024-04-05 莱乌科股份公司 泵送装置
IT202000005557A1 (it) * 2020-03-16 2021-09-16 Comet Spa Testata rinforzata per una pompa volumetrica

Also Published As

Publication number Publication date
ITRE20120073A1 (it) 2014-04-20
EP2722526B1 (de) 2015-12-02

Similar Documents

Publication Publication Date Title
RU2528220C2 (ru) Уравновешенный вставной клапан
US4541607A (en) High-pressure ball valve
US6554587B2 (en) Pump and diaphragm for use therein
US20110253493A1 (en) Damper
EA006123B1 (ru) Клапанное устройство для поршневых механизмов, таких как насос и компрессор
KR20110088560A (ko) 압력 평형 방식으로 배열된 폐쇄 요소를 나타내는 카트리지 밸브 인서트를 구비한 유압 밸브 조립체
EP2405137B1 (de) Pumpe
KR102189005B1 (ko) 고압 펌프
WO2006025886A3 (en) Low-friction reciprocating pump
EP2722526B1 (de) Hydraulische Kolbenpumpe
KR20090014306A (ko) 밀봉 부재를 포함하는 차량 브레이크 시스템용 피스톤 펌프
KR20010070370A (ko) 2포트 밸브
KR20010070369A (ko) 2포트 밸브
EP3315772B1 (de) Pneumatische eintauchschmierstoffpumpe
JP4790374B2 (ja) 真空弁
CN108137020B (zh) 液压总成
US2595592A (en) Packing structure
CN105179194B (zh) 用于静液压活塞机的调节装置和静液压轴向活塞机
US20180171995A1 (en) Membrane pump
CN110762078A (zh) 破碎机的缓冲油缸
KR102179209B1 (ko) 카트리지 압력 증폭기를 구비한 유압 액추에이터
US4523515A (en) Valve operating cylinder unit
US2781053A (en) Valve assembly
US9995300B2 (en) Cartridge retention system
IL271641B2 (en) Use of silicone rings in a double action flushing pump

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20141007

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20150625

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 763765

Country of ref document: AT

Kind code of ref document: T

Effective date: 20151215

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602013003973

Country of ref document: DE

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: INTERPUMP GROUP S.P.A.

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 602013003973

Country of ref document: DE

Owner name: INTERPUMP GROUP S.P.A., SANT'ILARIO D'ENZA, IT

Free format text: FORMER OWNER: INTERPUMP ENGINEERING S.R.L., REGGIO EMILIA, IT

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20160302

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 763765

Country of ref document: AT

Kind code of ref document: T

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160302

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160404

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160402

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602013003973

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

26N No opposition filed

Effective date: 20160905

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160731

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160731

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160801

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170331

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160708

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20170708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170708

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20130708

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: MT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151202

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230727

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20240430

Year of fee payment: 12