Pump Type Patents (Class 137/454.4)
  • Patent number: 9638185
    Abstract: A double displacement pump includes an inlet manifold, an outlet manifold, a first fluid cavity between the inlet manifold and the outlet manifold, a second fluid cavity between the inlet manifold and the outlet manifold, and a drive system that includes a housing defining an internal pressure chamber, a piston disposed within the internal pressure chamber and having a first and second pull chambers and a central slot for receiving a drive, a first pull with a free end slidably secured within the first pull chamber and a second pull with a free end slidably secured within the second pull chamber, and a first fluid displacement member coupled to the first pull and a second fluid displacement member coupled to the second pull.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: May 2, 2017
    Assignee: Graco Minnesota Inc.
    Inventors: Bradley H. Hines, Brian W. Koehn, Jeffrey A. Earles, Paul W. Scheierl, Adam K. Collins
  • Patent number: 9631617
    Abstract: A piston pump, in particular for a hydraulic assembly of an electronically controllable vehicle brake system, includes a cylinder element that has a pressure chamber with an outlet formed on the inside. The piston pump further includes an outlet-restricting element held on the outside of the cylinder element on a component by a first holder.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: April 25, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Oliver Gaertner, Heiko Jahn, Marc Zimmermann, Daniel Gosse
  • Patent number: 9382905
    Abstract: An improved manifold and valve cartridges suitable for high power (over 600 hp) reciprocating pumps for water blast or jet applications are disclosed. In one aspect, the disclosed valve cartridges are compact and mounted axially along a seat member that has a central bore in addition to suction and discharge seats. The seat member can also be provided a plurality of radially arranged bores for allowing suction flow to the pump. A spool valve assembly can be mounted through the seat member bore, and can include a valve spool, a spherical suction valve member, a compression spring, and compression-locked rings. The spool valve can include a closed flanged end that engages with the seat member discharge seat. In operation, the compression spring continuously pushes the spool valve closed flanged end against the discharge seat and pushes the suction valve member against the suction seat to retain a normally closed position.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: July 5, 2016
    Assignee: Federal Signal Corporation
    Inventor: Xiaolun Huang
  • Publication number: 20150147194
    Abstract: Disclosed is an improved segmented fluid end for high-pressure plunger pumps. One segmented fluid end includes one or more fluid end modules, each fluid end module including a body providing a plunger bore configured to receive a plunger therein and a discharge outlet in fluid communication with the plunger bore, wherein a pressurized working fluid may exit the body of each fluid end module via the discharge outlet, a discharge manifold having an elongate manifold body configured to be operatively coupled to each fluid end module, the manifold body providing a first end, a second end, a discharge bore extending between the first and second ends, and one or more discharge inlets that fluidly communicate with the discharge bore, and a ring joint gasket arranged between each discharge inlet of the discharge manifold and a corresponding discharge outlet of the one or more fluid end modules.
    Type: Application
    Filed: October 16, 2013
    Publication date: May 28, 2015
    Inventor: Earl Foote
  • Publication number: 20150118082
    Abstract: A pump includes a check valve cartridge removably mounted to the pump. The cartridge includes an inlet check valve and a discharge check valve. A connector mounts intermediate the inlet check valve and the discharge check valve. The inlet and discharge check valves each have a valve ball movable between an open position and a closed position, a valve seat engaging the valve member in the closed position, an inlet and an outlet.
    Type: Application
    Filed: October 31, 2014
    Publication date: April 30, 2015
    Inventor: Richard D. HEMBREE
  • Patent number: 8985138
    Abstract: A valve arrangement includes at least two valves and a housing which is configured as an installation cartridge. One of the valves is configured as a pressure regulator and the other of the valves is configured as a delivery flow regulator. The valve arrangement is configured to be inserted or screwed into a variable-displacement pump, thereby minimizing the spatial requirement of the valve arrangement.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: March 24, 2015
    Assignee: Robert Bosch GmbH
    Inventor: Christian Spielvogel
  • Patent number: 8726925
    Abstract: A back pressure regulating valve includes a valve body having a fluid inlet, a fluid outlet, a central bore, a bonnet housing a load spring operatively coupled to a diaphragm, and a chamber in flow communication with the fluid inlet. A valve cartridge includes a housing sized to fit within the central bore and including a first portion, a second portion, a valve guide, and a flow passage. A valve seat is disposed in the housing, and a valve plug is shiftable between an open position permitting flow and a closed position preventing flow. The valve plug engages a valve guide, and a spring biases the valve plug toward the open position. A retainer is disposed adjacent the first portion of the housing and engages a portion of the valve plug to retain the valve plug in the housing.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: May 20, 2014
    Assignee: Tescom Corporation
    Inventor: Jason D. Clifford
  • Patent number: 8709357
    Abstract: Embodiments described herein provide micro-fluidic systems and devices for use in performing various diagnostic and analytical tests. According to one embodiment, the micro-fluidic device includes a sample chamber for receiving a sample, and a reaction chamber for performing a chemical reaction. A bubble jet pump is structured on the device to control delivery of a fluid from the sample chamber to the reaction chamber. The pump is fluidically coupled to one or more chambers of the device using a fluidic channel such as a capillary. A valve may be coupled to one or more chambers to control flow into and out of those chambers. Also, a sensor may be positioned in one or more of the chambers, such as the reactant chamber, for sensing a property of the fluid within the chamber as well as the presence of a chemical within the chamber.
    Type: Grant
    Filed: April 8, 2013
    Date of Patent: April 29, 2014
    Assignee: Incube Labs, LLC
    Inventor: Mir Imran
  • Patent number: 8365754
    Abstract: A valve cover assembly for a pump. In an embodiment, the valve cover assembly comprises a first cylindrical member having a central axis and a first throughbore. In addition, the valve cover assembly comprises a second cylindrical member coaxially disposed within the first throughbore and rotatable relative to the first cylindrical member about the central axis between a first position and a second position. In the first position, the second cylindrical member is axially translatable relative to the first cylindrical member. In the second position, the second cylindrical member is axially fixed relative to the first cylindrical member.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: February 5, 2013
    Assignee: National Oilwell Varco, L.P.
    Inventors: Andrew Dale Riley, Randall Ferrain Weaver
  • Patent number: 8052406
    Abstract: A valve retainer is provided for securably retaining a discharge valve assembly within a recess formed in a scroll. The valve retainer can be installed between the recess of the non-orbital scroll and the discharge valve assembly to retain the discharge valve assembly at the recess. The valve retainer can include a ring-like body having inwardly and/or outwardly extending tangs for cooperating with structure formed on the respective valve and the recess of the non-orbital scroll.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: November 8, 2011
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Feng E. Li, Jin Zhang, Samuel P. Busching, Shane J. Angle, William P. Tobe
  • Patent number: 7975717
    Abstract: A valve pin insert has a body for insertion into a valve plate and a stud integrally formed with the body and extending from one end of the body above the valve plate. The body has a lower shank at an end of the body that is opposite from the end at which the stud is positioned, and an upper shank at the end of the body adjacent to the end of the body at which the stud is positioned. The lower shank is of a lesser diameter than the upper shank and an undercut shoulder between the shanks forms a recess opening in the direction toward the lower shank and forms a tooth which shears material of the valve plate as the pin is inserted into a hole in the valve plate.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: July 12, 2011
    Assignee: Thomas Industries, Inc.
    Inventors: Richard C. Fuksa, Jun Zhu
  • Patent number: 7891374
    Abstract: A suction valve seat and guide assembly has an outer ring and a peripheral flange projecting outwardly from the bottom of the outer ring, and an inner surface with a top part sloping downwardly and inwardly toward the center of the outer ring. The outer ring has an outer surface that slopes upwardly and inwardly from the flange. The guide has an inner ring positioned within the outer ring and a number of spaced-apart fins connecting the inner ring to the outer ring. A retainer has an internal passageway, an externally threaded, upper segment within the top of which is fitted the peripheral flange of the seat; a middle segment that is affixed to the bottom of the upper segment and has a polygonal cross section for easy gripping by a wrench; and, a bottom segment that is affixed to the bottom of the middle segment.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: February 22, 2011
    Inventor: Berton L. Vicars
  • Patent number: 7785086
    Abstract: The invention relates to a supply device for the supply of pressure fluid into at least one vehicle brake or into a pressure fluid accumulator, wherein a piston is movably arranged in an accommodating member, a carrier bears a non-return valve arranged coaxially to the piston for the purpose of ventilating a working chamber into which the piston plunges , and wherein a resetting spring is arranged between the carrier and the piston. It is the essence of the invention that a multi-piece cage allows inserting the resetting Spring into the cage parts, the cage parts comprise fastening means that lock the cage due to relative displacement of the cage parts, and the resetting spring is caged and simultaneously elastically preloaded under the relative displacement of the cage parts.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: August 31, 2010
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Dieter Dinkel, Axel Hinz, Albrecht Otto, Hans-Georg Zentgraf, Daniel Zuk
  • Patent number: 7721757
    Abstract: A discharge check valve assembly for use with a hermetic scroll compressor having a compressor shell is provided. The discharge check valve assembly includes a valve housing and a valve seat located within the valve housing. The valve housing is configured to mount the discharge check valve assembly to the compressor shell. The discharge check valve assembly also includes a discharge fitting and a valve subassembly. The discharge fitting is configured to mount to the compressor shell and configured to connect to a connecting tube in fluid communication with a high-pressure system. The valve subassembly has a valve member movable between an open position and a closed position. Additionally, the valve subassembly is configured to be inserted through the discharge fitting into the valve housing.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: May 25, 2010
    Assignee: Danfoss Maneurop S.A.
    Inventors: Pierre Ginies, Pierre Soulas, Holger Nicolaisen
  • Patent number: 7296591
    Abstract: A valve arrangement for reciprocating machine, where the arrangement (1) comprises an in-valve (18) and an out-valve (19), each valve (18), (19) being a springloaded one-way valve designed to open for flow when the pressure differential in the direction of flow provides a force that exceeds the spring tension, wherein the valves (18, 19) are mounted in a casing (8) that forms or is connected to the cylinder head of the reciprocating engine (2). The in-valve (18) and the out-valve (19) are mounted in a sleeve (16) designed to be fitted in a bore (9) in the casing (8), and where fluid may flow to the sleeve (16) from an inlet (11) in the casing (8) and into the sleeve (16) via the in-valve (18), and where the sleeve (16) is provided with at least one perforated area where fluid may flow radially out of or into the sleeve (16) via holes (50, 51), thereby flowing to or from a passage (14, 15) that forms a perpendicular or near perpendicular connection with the bore (9).
    Type: Grant
    Filed: March 18, 2003
    Date of Patent: November 20, 2007
    Assignee: National Oilwell Norway A/S
    Inventors: Magne Moe, Åge Kyllingstad
  • Patent number: 7290559
    Abstract: A check valve having a valve housing inserted into a receptacle in which housing a pistonlike valve member is guided longitudinally displaceably and cooperating with a valve seat on the valve housing. The valve member is urged in the closing direction by a prestressed closing spring and in the opening direction by the pressure prevailing in an inlet, and the valve member is inserted into the valve housing from the side of the valve seat. The valve housing is embodied in one piece and is embodied as cup-shaped and has both a bottom and a jacket region that defines a recess. With the open end of its recess, the valve housing points out of the receptacle, and the valve seat is located on the bottom of the valve housing, facing away from the recess. With a shaft, the valve member protrudes through a bore in the bottom into the recess in which the closing spring is located.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: November 6, 2007
    Assignee: Robert Bosch GmbH
    Inventors: Markus Nieslony, Alfons Schoetz, Matthias Distel, Achim Koehler, Falko Bredow, Waldemar Kiel, Jochen Aleker
  • Patent number: 7290560
    Abstract: An apparatus and method to assemble and disassemble a valve cover locking screw assembly for a reciprocating pump module block. The module block has a bore, a removable valve cover closing the bore, and a valve cover locking ring securable to the block and surrounding the bore with internal threads. A valve cover locking screw has cylindrical walls with external threads, a closed top, and an open bottom. A plurality of threaded bolts engage a plurality of threaded openings through the cylindrical walls of the locking screw so that the bolts force the valve cover against the module block thereby creating a fluid tight seal.
    Type: Grant
    Filed: April 13, 2004
    Date of Patent: November 6, 2007
    Assignee: Helmerich & Payne, Inc.
    Inventors: Alan Orr, Eric Thomas Greager, Ernest J. Jensen
  • Patent number: 7195464
    Abstract: A hydraulic axial piston pump comprising a cylinder block closed at sides by a head and by a containment casing for piston actuating a plate, an electric motor coupled to the plate, reversible locking means for a bypass valve inserted in a seat of the body and kinematically connected to a microswitch connected to the electric motor, the reversible locking means comprising a retention element insertable transversely to the seat in a receptacle formed in the body without structure discontinuity, the bypass valve head being integrated in a shell external to the body and enclosing the microswitch and the kinematic system.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: March 27, 2007
    Assignee: Lavorwash S.p.A.
    Inventor: Giancarlo Lanfredi
  • Patent number: 6932109
    Abstract: A poppet scavenger valve includes multiple cages for multiple poppets, permitting better control of the spacing of the assembly, facilitating maintenance and permitting better fluid flow through the cage structure. A spacer or lift plate may be positioned between the cage and the seat for defining a flow control device for accurately setting and controlling the valve flow. Each cage component is mounted on the lift plate and is trapped between the plate and the seat. Alignment pins are provided to assure proper alignment between the cylinders and the mated counter bores in the cages. The stroke, or valve flow, can be controlled by adjusting the height of the lift plate, without any alteration to or modification of the cage. Multiple cage configurations are possible, including cages for supporting any array of poppets from a grid to a longitudinal assembly. Each cage is adapted for supporting any multiple of poppets, including single poppet cage systems where applicable.
    Type: Grant
    Filed: July 26, 2002
    Date of Patent: August 23, 2005
    Inventors: Gene M. Thompson, Edgar G. Beidler
  • Patent number: 6880577
    Abstract: The reed valve assembly of the present invention includes a reed cage, a retainer, and reed petals. The retainer is independently interlockable with the reed cage. As defined herein, independently interlockable is understood to mean that no additional parts are required to connect the retainer to the reed cage. As implied by the term interlockable, the retainer and reed cage are separable. The reed petals are removably secured to the reed cage. In one embodiment, the reed petals are secured to the reed cage with the retainer.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: April 19, 2005
    Inventors: Steven M. Tassinari, Scott A. Tassinari
  • Patent number: 6866489
    Abstract: The present invention related to a piston pump, in particular for controllable brake systems such as ABS or ESP, wherein a working chamber of the pump in front of a piston is delimited by a pressure valve, and a resetting spring with its one end is supported on a valve seat carrier of the pressure valve and with its other end resets said piston into its bottom dead center position. An object is to render the assembly of the mass-produced pumps as inexpensive and simple as possible. To achieve this object, the present invention discloses that the resetting spring be adapted to be attached directly or indirectly to the valve seat carrier in addition.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: March 15, 2005
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Axel Hinz, Hans-Dieter Reinartz, Peter Volz, Günther Vogel, Uwe Greiff, Matthias Viering
  • Patent number: 6805157
    Abstract: A check-valve fixing structure includes a base body formed with a passage in which a check valve is inserted, a receiver formed in the passage, and a flange formed with a socket member of the check valve and engaged with the receiver when the check valve is inserted in the passage. With the flange being placed on a valve-seat member of the check valve and abutting on the receiver, the base body is crimped at an opening end of the passage to fix the socket member and the valve-seat member to the base body.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: October 19, 2004
    Assignee: Hitachi Unisia Automotive, Ltd.
    Inventors: Chiharu Nakazawa, Hikaru Morita
  • Patent number: 6786232
    Abstract: A check valve for a piston pump of a traction-controlled vehicle brake system includes hollow cylindrical valve seat part and a disk-shaped valve closing body, which is embraced by a spring clip and is secured to and guided against the valve seat part. The invention has the advantage that the check valve can be simply and inexpensively manufactured.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: September 7, 2004
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang Schuller, Beate Schumann
  • Patent number: 6783337
    Abstract: A check valve assembly includes a plug having a first end and a second end spaced along a longitudinal axis of the check valve assembly. The check valve assembly also includes a first valve seat, wherein the first end of the plug sealingly contacts the first valve seat. A second valve seat is spaced from the first valve seat in a direction of the longitudinal axis. The check valve assembly further includes a resilient member between the plug and the second valve seat and a spring member urging the resilient member into sealing contact with the second valve seat and the plug.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: August 31, 2004
    Assignee: Caterpillar Inc
    Inventor: Bryan E. Nelson
  • Publication number: 20040140006
    Abstract: A valve pin insert has a body for insertion into a valve plate and a stud integrally formed with the body and extending from one end of the body above the valve plate. The body has a lower shank at an end of the body that is opposite from the end at which the stud is positioned, and an upper shank at the end of the body adjacent to the end of the body at which the stud is positioned. The lower shank is of a lesser diameter than the upper shank and an undercut shoulder between the shanks forms a recess opening in the direction toward the lower shank and forms a tooth which shears material of the valve plate as the pin is inserted into a hole in the valve plate. The insert is a relatively harder plastic and the valve plate is a relatively softer plastic.
    Type: Application
    Filed: January 7, 2004
    Publication date: July 22, 2004
    Inventors: Richard C. Fuksa, Jun Zhu
  • Patent number: 6622751
    Abstract: A pressure valve, particularly for a reciprocating piston pump for conveying pressure fluid in slip-controlled hydraulic brake systems, wherein the pressure valve has a valve seat body and a valve cover body with a pre-tensioning element and a valve element installed in the space formed between the valve seat body and the cover body, which is particularly economical to manufacture, easy to install and particularly safe because of the valve seat body and the valve cover body being manufactured by non-cutting process.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: September 23, 2003
    Assignee: Continental Teves AG & Co., OHG
    Inventors: Erhard Beck, Hans-Dieter Reinartz, Günther Vogel
  • Patent number: 6524084
    Abstract: A motor pump aggregate M has a housing 1 defining an oil reservoir with first and second chambers R1, R2. An electromotor 2 is driving via its motor shaft W at least one radial piston pump arrangement P1 provided within said first chamber R2. Both chambers R1, R2 are separated by a separation wall 7. A filling and pressure biasing system V is provided for said first chamber R1 in order to adjust within said first chamber R1 a predetermined oil filling level and a pre-selected oil pressure pre-biasing for said radial piston pump arrangement P1.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: February 25, 2003
    Assignee: Heilmeier & Weinlein Fabrik fur Oel-Hydraulik GmbH & CO. KG
    Inventor: Georg Neumair
  • Patent number: 6406278
    Abstract: The pump has a body including at least a fuel compression chamber and an actuating chamber enclosing the actuating members of the pump; the on-off valve is defined by an independent operating assembly insertable in fluidtight manner inside a hole in the body; the hole connects an inlet conduit to the actuating chamber and to a feed conduit of the compression chamber; the assembly of the valve has a sleeve in turn having an opening located at the fuel feed conduit and which is closed by a shutter sliding inside the sleeve; the sleeve has two seats for two seals located on opposite sides of the opening; and the feed conduit is straight, and can be formed using a drilling tool through the hole.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: June 18, 2002
    Assignee: Robert Bosch GmbH
    Inventors: Sisto Luigi De Matthaeis, Angelo Beatrice
  • Patent number: 6354819
    Abstract: A mechanically actuated diaphragm pump for pumping fluids includes a pump head body having an outer surface, a pumping cavity, an inlet, an outlet, and suction and discharge valves. The suction and discharge valves are externally mounted on the pump head body and are slidably removable in a direction perpendicular to the direction of fluid flow to or from the pump.
    Type: Grant
    Filed: July 14, 1998
    Date of Patent: March 12, 2002
    Assignee: United States Filter Corporation
    Inventors: Manor M. Parikh, John A. Soper, Ronald M. Bradbury
  • Publication number: 20020009373
    Abstract: The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, particularly in a common rail injection system, with a drive shaft (4) that is supported in a pump housing (2) and is embodied eccentrically or has a number of cam-like projections in the circumference direction, and preferably with a number of pistons (12) that are disposed radially with regard to the drive shaft (4), each in a respective cylinder chamber (18, 74), and can be set into a reciprocating motion in the radial direction in the cylinder chamber (18, 74) upon rotation of the drive shaft (4), wherein each respective cylinder chamber (18, 74) is sealed on the radial outside in relation to the drive shaft (4) by a valve plate (24, 72) that has an intake side check valve (26, 60) and a high-pressure side check valve (28); in order to increase the efficiency of the pump, the invention proposes that the intake side check valve (26, 60) has a tappet (30, 66) that passes th
    Type: Application
    Filed: August 30, 1999
    Publication date: January 24, 2002
    Inventors: SIEGFRIED RUTHARDT, RAINER HAEBERER, RAINER LORENZ, GERD LOESCH, SANDRO SOCCOL
  • Patent number: 6314990
    Abstract: A pressure valve for a compressor, in particular a hermetically encapsulated small-size refrigerating machine, comprising the following elements: a valve plate (33), a cylinder cover (40)comprising a substantially quadrangular base plate with cylinder walls formed thereon, with the valve plate (33) and the cylinder cover (40) being mutually connected by means of fastening elements, and with a seal (58) arranged in between and a valve spring (23) arranged in the volume enclosed by the valve plate (33) and the cylinder lid (40), a substantially U-shaped holding-down element (21) with pins and legs taking the squaring and, optionally, a damper element (27), with the valve spring, the damper element and the holding-down element being arranged in this sequence above the valve seat.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: November 13, 2001
    Assignee: Verdichter Oe. Ges. m.b.H.
    Inventors: Walter Brabek, Hans Peter Schögler
  • Patent number: 6224350
    Abstract: The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines. The pump includes a drive shaft that is supported in a pump housing and is embodied eccentrically or has a number of cam-like projections in the circumference direction, with a number of pistons that are disposed radially with regard to the drive shaft, each piston in a respective cylinder chamber. Each piston can be set into a reciprocating motion in the cylinder chamber upon rotation of the drive shaft. The pump includes an intake side and a high-pressure side check valve, and a component which has a through opening that constitutes the cylinder chamber, into whose radially outer end, a sealing element is inserted. The intake side check valve is integrated into the sealing element.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: May 1, 2001
    Assignee: Robert Bosch GmbH
    Inventors: Josef Guentert, Ralf Haegele
  • Patent number: 6190144
    Abstract: A compressor having at least one cylinder in which is defined a compression chamber defined at the bottom by a piston movable along the cylinder, and at the top by a wall having a suction opening and an exhaust opening, each of which is connected to a respective conduit by a respective valve having a channel in which a sealing member slides, in opposition to a spring, from a closed position, in which the compression chamber is cut off from the respective conduit, to an open position, in which the compression chamber communicates with the respective conduit.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: February 20, 2001
    Assignee: Abac Aria Compressa S.p.A.
    Inventor: Antonio Balma