US3410307A - Installations comprising several free piston autogenerators supplying a receiver with driving gases - Google Patents

Installations comprising several free piston autogenerators supplying a receiver with driving gases Download PDF

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US3410307A
US3410307A US46266465A US3410307A US 3410307 A US3410307 A US 3410307A US 46266465 A US46266465 A US 46266465A US 3410307 A US3410307 A US 3410307A
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Prior art keywords
collector
piston
pressure
valve member
valve
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Expired - Lifetime
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English (en)
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Szereszewski Pinchas Paul
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Societe dEtudes et de Participations Eau Gaz Electricite Energie SA
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Participations Eau Soc Et
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
    • F01B11/04—Engines combined with reciprocatory driven devices, e.g. hammers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
    • F02B71/06—Free-piston combustion gas generators per se
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/12—Devices or methods for making a gas mixture for a combustion engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86501—Sequential distributor or collector type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/877—With flow control means for branched passages
    • Y10T137/87788—With valve or movable deflector at junction

Definitions

  • the invention relates to means for automatically controlling the motion speeds of the valve members of three way valve systems between positions where they respectively connect the free piston autogenerators of an installation constituted of several of said autogenerators with either a receiver engine, such as a turbine, which is to be supplied with the driving gases produced by said autogenerators or the atmosphere, said autogenerators being connected with both for intermediate positions of said valve members.
  • a receiver engine such as a turbine
  • said autogenerators being connected with both for intermediate positions of said valve members.
  • These means are adapted to restrain the speed of the motion of each of said valve members when it is desired to connect the corresponding autogenerator with the receiver engine as well as, preferably, on the last portion of the travel of said valve member in the opposite direction.
  • the invention relates to installations comprising several free piston autogenerators which supply a receiver, in particular a turbine, with driving gases.
  • the object of the invention is to simplify the operations to be performed by said supervisor and to automatize the motions of the valve as soon as they are started in one direction or in the other either by the supervisor or by a governor.
  • the invention is more particularly concerned with the control of a three way valve system provided, between each autogenerator and the collector, upstream from the receiver and which is likely, in its extreme positions, to connect the autogenerator either with the receiver or with a space under low pressure for instance the atmosphere, whereas, in its intermediate positions, it permits more or less throttled connections between the autogenerator and, on the one hand, the collector and, on the other hand, the space under low pressure.
  • control means for the operation of the valve member of said three way valve system are arranged in such manner that they automatiice cally cause, when it is desired to connect the autogenerator with the collector, a slow motion of the valve with a progressive increase of the section of the throttled communication between the autogenerator and the collector and a concomitant progressive decrease of the section of the throttled communication between the autogenerator and said space under low pressure whereas, when it is desired to disconnect the autogenerator from the collector, they cause a rapid motion of said valve member, at least in the first portion of the stroke thereof, toward the position in which said valve member closes the communication between the autognerator and the collector and opens completely the communication between the autogenerator and the space under low pressure.
  • said valve is contrived in a manner such that it comprises, on either side of the part of its body which carries the surfaces coming into contact with valve seats provided in the chamber of said three way valve system for closing completely the communication between the autogenerator and either the collector in one of its extreme positions or the space under low pressure in its other extreme position, protruding extensions the respective diameters of which decrease toward their extremities so that they cooperate with the one or the other of said valve seats for producing said throttled connections between the autogenerator and, on the one hand, the collector and, on the other hand, the space under low pressure, the sections of said throttled connection varying progressively when said valve member moves progressively from one of said seats to the other.
  • FIG. 1 shows diagrammatically a part of the installation in accordance with the invention, said part comprising in particular one of the autogenerators supplying the collector of the installation with driving gases and means controlling the communication of this autogenerator either with the collector or with the atmosphere:
  • FIGS. 2, 3 and 4 show the said control means in several operating positions
  • FIG. 5 is a diagram showing the respective evolutions of the delivery pressure when one of the autogenerators is connected with the common collector for two different working conditions of said installation.
  • FIGS. 6 to 8 show other exemplary embodiments, according to the invention, of the means controlling the operation of said three way valve system.
  • FIGURES 1 to 4 show an installation comprising for instance three piston autogenerators and a turbine fed with driving gases supplied by said autogenerators.
  • the installation comprises a collector 1 and three gas supply pipes 2 2 2 leading thereto, each of said pip s connecting one autogenerator to said collector. Only one of said autogenerators shown at 3 is represented in FIG. 1, this autogenerator being connected to the pipe 2,.
  • the collector 1 is further connected through a pipe 4 to a turbine 5 which is driven :by the driving gases supplied by the working autogenerators to the collector 1.
  • Each of said free piston autogenerators comprises, as well known, a driving or motor part working preferably according to a two stroke diesel cycle and a compressor part compressing and delivering air to the motor part.
  • the driving gases delivered by the autogenerator are constituted by the mixture of uncompletely expanded combustion gases formed therein and of the excess of scavenging air supplied by the compressor part to the motor part.
  • this mixture arrives first to an exhaust pot 6 and afterwards to a three way valve system 7 within which a valve member 8 is provided.
  • This three way valve system is connected, on the one hand, to said exhaust pot 6, on the other hand to the pipe 2,, communicating with the collector 1 and finally to a conduit 9 which opens to the atmosphere.
  • the valve member 8 closes the communication between the exhaust pot 6 and the pipe 2,, by its application on the valve seat 8 and it permits the large opening of the communication between said exhaust pot and the conduit 9.
  • said valve member provides throttled communications between the exhaust pot 6 and simultaneously the collector 1 on the one hand, and the conduit 9 on the other hand.
  • valve member opens fully the communication between the exhaust pot 6 and the collector 1 and closes the communication between the exhaust pot 6 and the conduit 9 by its application against the valve seat 8
  • control means of said valve member for opening for example the connection between one autogenerator 3 and the collector 1 supplied under a given pressure with the driving gases from other autogenerators of the same installation, they are arranged, according to the invention, in a manner such that they cause a slow motion of the valve member in the direction of the opening of the communication between the newly started autogenerator 3 and the pipe 2 which leads to the collector 1 and the concomitant closing of the communication between the same autogenerator 3 and the conduit 9, so that the pressure of the gases supplied by the autogenerator 3 may increase progressively and that consequently an equalization occurs between the pressures existing in the exhaust pot 6 and the collector 1.
  • valve 8 starting from the position shown in FIG. 1, passes through the intermediate position such as shown in FIG. 2 and finally stops at the end of the connection period in the position shown in FIG. 3 in which it opens a large communication between the exhaust pot 6 and the collector and closes completely the conduit 9.
  • FIG. 5 shows the changes in the pressures within the exhaust pot 6 during the performance of this connection operation in the case, on the one hand, where the pressure in the collector 1 is relatively high, for instance equals 3 atmospheres and, on the other hand, where the pressure in the same collector is low, for instance equals or nears 0 atmosphere.
  • the abscissae in said diagram correspond to the stroke of the valve member 8 or to the time of duration of said stroke, whereas the ordinates correspond to the pressures in the exhaust pot 6.
  • the pressure within the exhaust pot 6 first increases up to an intermediate position of the valve member. In the first case, the pressure further increases beyond this intermediate position to approximately equal said pressure of 3 atmospheres within the collector. However, in the second case, the pressure within the exhaust pot 6 decreases after this intermediate position of the valve member to become approximately equal to the one existing in the collector 1, thus practically to the atmospheric pressure.
  • control means of the valve member 8 are arranged such that they control a rapid return stroke of said valve member-namely in the direction where it opens the communication between the exhaust pot 6 of the autogenerator 3 and the conduit 9 and closes at least partially the communication between said exhaust pot 6 and the collector 1at least in the first part of said stroke.
  • This last motion of the valve member permits the decrease and the suppression of the feeding of the turbine by the concerned autogenerator when the load of the same suddenly decreases, for
  • this rapid motion which produces a rapid decrease of the delivery of driving gases from the concerned autogenerator to the collector is stopped before the complete closing of the pipe 2 by said valve member, in an intermediate position, for instance in the one shown in FIG. 4, the further motion of said valve in the same direction being again slowed down.
  • the supply of gases to the collector 1 is sufliciently reduced and one avoids a too rapid decrease of the pressure within the exhaust pot 6, such a too rapid decrease in pressure being likely to stop the autogenerator 3.
  • Another reason which justifies the slow operation of the end portion of the return-stroke of the valve member 8 in the direction of closure of the pipe 2, lies in the fact that the sudden decrease in load of the turbine lasts only a short time, for instance during only a few seconds, and that afterwards the valve member 8 must permit the passage of sufficient quantities of gas toward the turbine in order to maintain the turbine in idling operation or, if the case should be, to enable the same to deliver a reduced power.
  • the valve member 8 is advantageously provided, on either side of its median portion which carries the surfaces resting against the valve seats 8 or 8 for the extreme positions of the valve member, with protruding extensions 10 and 11 the diameters of which decrease toward their extremities and the side surfaces of which cooperate with the seats 8,, and 8,, respectively, for con trolling the increase or decrease of the sections of the throttled passage for the gases between the exhaust pot 6 and the pipe 2,, as well as between the exhaust pot 6 and the conduit 9, according to predetermined laws, during the motions in either direction of said valve member.
  • the generating lines of the side walls of said protruding extensions are chosen such as to correspond to the desired laws of variation of the sections of said throttled passages in function of the intermediate positions of said valve member.
  • control means of the valve 8 such as defined here above may be of different nature, for instance of pneumatic, hydraulic or electric nature.
  • the valve member 8 is mounted on a rod 12 carrying a piston 13 which divides one cylinder 14 in two compartments a and b.
  • the cylinder 14, which is closed on the side directed toward the valve 8, is provided with an inlet 15 for a liquid under pressure and opens by its other side into a second cylinder 16 having a larger diameter.
  • a piston 17, which is slidably fitted on an extension 12 of the rod 12, works in said cylinder 16 (FIG. 1), the extension 12,, extending beyond the piston 13 on the opposite side thereof with respect to the valve member 8.
  • the compartment b is thus limited on one side by the piston 13 and on the other side by the piston 17.
  • the compartment 0 of cylinder 16 which is located on the opposite side of the piston 17 communicates with an accumulator 20 of fluid under pressure through an opening 18 controlled by a valve 19.
  • the compartments b and c are interconnected by a conduit 21 provided with a throttle 22.
  • another conduit 23, equally comprising a throttle 24, is connected with the conduit 21.
  • the valve 19, as shown in FIGS. 1 to 4, is shaped as a stepped piston, the part thereof having the smaller diameter closing the opening 18 when said part is applied against the border of said opening. Said part of smaller diameter works in a space d having a larger diameter which is connected with the accumulator 20 through a conduit 25.
  • the portion of the valve 19 having the largest diameter operates in a cylinder 26, a spring 27 being lodged therein, said spring tending to move the valve 19 toward the opening 18 in order to ensure the closing thereof.
  • the bottom of said cylinder 26 is connected through a conduit 28 and an electrovalve 29, either with the accumulator 20 through a further conduit 31 or with the atmosphere through an outlet 31.
  • the pressure generated in the accumulator 20 is far superior to the pressure which is fed by the inlet into the compartment (1. For instance the pressure in compartment a is equal to 3 atmospheres whereas the pressure which is permanently generated in the accumulator is for instance equal to 12 atmospheres. This pressure is maintained in the accumulator 20 by a pump not represented.
  • valve member 8 is in the position shown in FIG. 1, that is to say in the position for which it closes the communication between the exhaust pot 6 of the autogenerator 3 and the collector 1 and enables the communication of said exhaust pot with the conduit 9.
  • the electrovalve 29 is in the position shown equally in FIG. 1. In such a position, it closes the communication between the accumulator 20 and the interior space of the valve 19 within the cylinder 26. Consequently, the pressure which reigns in the accumulator 20, and which is supplied in the space a by its action upon the shoulder 19 formed by the portion having the largest diameter of the valve 19, maintains the same against the spring 27 in the position for which the opening 18 is open.
  • the pressure in the accumulator 20 is transferred to the space c within which it acts on piston 17 to apply the same against an abutment shoulder 32.
  • the pressure of the accumulator is fed through the conduit 21 and the throttle 22 in the compartment b of the cylinder 14 and thus acts on the piston 13 which maintains the valve member 8 in the position shown in FIG. 1 since the pressure fed by the accumulator 20 is higher than the pressure fed to the compartment a through the inlet .15.
  • the electrovalve 29 is brought into the position shown in FIG. 2. In this position, it opens the communication of the accumulator 20 with the cylinder 26.
  • valve member 8 and its control elements connect completely the autogenerator 3 with the collector 1. If it is desired to dis connect the autogenerator 3 from the collector 1, the electrovalve 29 is again brought into the position shown in FIG. 1 and equally in FIG. 4. As a consequence, the valve 19 opens, following the setting in communication of the cylinder 26 With the atmosphere whereas the shoulder 19,, of the valve 19 is still subjected to the pressure of the accumulator 20. The consequence of the opening of the valve 19 is the immediate action of the pressure reigning in the accumulator 20 on the piston 17. Owing to the importance of this pressure, both pistons 17 and 13, together with the: valve member 8, are moved rapidly to the left from the position shown in FIG. 3 to the intermediate position shown in FIG.
  • a flap 33 has been shown in the conduit 9 in FIGS. 1 to 4. This flap is only used to cause the variation of pressure in the exhaust pot 6 in the case where the autogenerator 3, which has been started, is not immediately connected with the collector 1. Consequently the flap 33 is of no use in the normal situation where it is desired to connect the autogenerator 3, after its starting, with the collector. In this last instance, all the operations are performed by the motions of the valve member 8.
  • FIG. 6 the embodiment represented in FIGS. 1 to 4 is slightly modified to have the same pressure accumulator delivering fluid under pressure either to the compartment c of cylinder 16 or in the compartment a of cylinder 14. This may be achieved for instance by connecting conduit 23 to inlet 15 by a line 35 and by further connecting the electrovalve 29 to said line 35 through a line 36 (FIGURE 6).
  • FIGURES 7 and 8 Still another embodiment is shown in FIGURES 7 and 8 in which the same elements than in the former figures are referred to by the same reference numbers.
  • An accumulator 40 of fluid under pressure is controlled by an electrovalve 41 to supply said fluid under pressure either through a line 42, to the exterior compartment a defined by the piston 13 in the cylinder 43 of the control means for the displacements of said valve member 8 or, through a line 44, to the exterior compartment 0 defined in said cylinder 42 by the piston 17.
  • FIG. 7 shows the electrovalve 41 in the position in which it allows the fluid under pressure to be fed in said compartment c while compartment a is connected with the atmosphere through line 42 and outlet 45.
  • piston 17 is then able to push rapidly piston 13 together with the valve member 8 in the direction where the latter closes partially the connection between said collector and said exhaust means until said piston 17 is stopped by abutment 46.
  • the piston 13 is then allowed to move further but slowly in the same direction until complete closure of the last lmcntioned connection owing to the supply under reduced flow of fluid under pressure in the central compartment b through line 21 throttled in 22.
  • An installation comprising free piston autogenerators, each of which is provided with exhaust means, a collector, communication means between each of said exhaust means and said collector, a three way valve system within said communication means, said three way valve system comprising a chamber connected to the concerned exhaust means, the collector and a space under low pressure, a valve member in said chamber which in a first extreme position connects said exhaust means to said collector only, in a second extreme position connects said exhaust means to said space only, and, in intermediate positions between said extreme positions, provides throttled communications of said exhaust means with both said collector and said space, said valve member being shaped such that the sections of the respective throttled communications vary regularly in function of the respective distances between any intermediate position considered and the extreme positions respectively of said valve member, means operative to move said valve member in either direction between said first and second respective extreme positions and means for restraining the speed of the motion of said valve from said second extreme position, where it connects said exhaust means to said space only, toward said first extreme position where it connects said exhaust means to said collector only.
  • An installation according to claim 1 further comprising means for restraining the speed of the motion of said valve from an intermediate position thereof toward said second extreme position where it connects said exhaust means to said space only.
  • An installation comprising free piston autogenerators, each of which is provided with exhaust means, a collector, communication means between each of said exhaust means and said collectors, a three way valve system within said communication means, said three Way valve system comprising a chamber connected to the concerned exhaust means, the collector and a space under low pressure, a valve member in said chamber which in a first extreme position connects said exhaust means to said collector only, in a second extreme position connects said exhaust means to said space only, and, in intermediate positions between said extreme positions, provides throttled communications of said exhaust means with both said collector and said space, a system comprising a cylinder and a piston working in said cylinder, said piston being rigid with said valve member for controlling the displacements thereof, sources for supplying in said cylinder fluid under different pressures in said cylinder on the opposite sides of said piston, the higher pressure being fed on the side of said piston where it causes the same to move said valve member in the direction where it closes the connection between said collector and said exhaust means, a throttled outlet in said cylinder on the side of the piston subject
  • An installation comprising free piston autogenerators, each of which is provided with exhaust means, a collector, communication means between each of said exhaust means and said collectors, a three way valve system within said communication means, said three way valve system comprising a chamber connected to the concerned exhaust means, the collector and a space under low pressure, a valve member in said chamber which in a first extreme position connects said exhaust means to said collector only, in a second extreme position connects said exhaust means to said space only, and, in intermediate positions between said extreme positions, provides throttled communications of said exhaust means with both said collector and said space, a system comprising cylinder means, a first piston rigidly connected to said valve member and a second piston slidable in said cylinder means, an abutment in the central compartment defined in said cylinder between said first and second pistons for limiting the displacements of said second piston toward said first piston, means for supplying fluid under a lower pressure and a higher pressure to respectively the first and second exterior compartments defined in said cylinder by said first and second pistons, control means operative to
  • An installation comprising free piston autogenerators, each of which is provided with exhaust means, a collector, communication means between each of said exhaust means and said collectors, a three way valve system within said communication means, said three way valve system comprising a chamber connected to the concerned exhaust means, the collector and a space under low pres sure, a valve member in said chamber which in a first extreme position connects said exhaust means to said collector only, in a second extreme position connects said exhaust means to said space only, and, in intermediate positions between said extreme positions, provides throttled communications of said exhaust means with both said collector and said space, a system comprising a cylinder, a first piston rigidly connected to said valve member and a second piston slidably fit in said cylinder, an abutment in the central compartment defined in said cylinder between said first and second pistons for limiting the displacements of said second piston toward said first piston, means for supplying a fluid under pressure, control means in said last mentioned means operable to permit the supply of either one of the first and second exterior compartments defined in said cylinder

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid-Driven Valves (AREA)
  • Control Of Fluid Pressure (AREA)
US46266465 1964-06-10 1965-06-09 Installations comprising several free piston autogenerators supplying a receiver with driving gases Expired - Lifetime US3410307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR977819A FR1417141A (fr) 1964-06-10 1964-06-10 Perfectionnements apportés aux installations dans lesquelles plusieurs autogénérateurs à piston libre alimentent une machine réceptrice

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US3410307A true US3410307A (en) 1968-11-12

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FR (1) FR1417141A (fr)
GB (1) GB1088478A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680713A (en) * 1970-11-09 1972-08-01 Snorkel Fire Equipment Co Fluid power device
US5294090A (en) * 1992-11-25 1994-03-15 Orbit Valve Company Valve snubber
US20110253539A1 (en) * 2008-11-05 2011-10-20 Mohamed Reda Akdim Electrostatic coalescer with resonance tracking circuit

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1718673A (en) * 1927-03-31 1929-06-25 Fritz A Wettstein Fluid-pressure regulator and return motion therefor
US2148616A (en) * 1937-05-15 1939-02-28 Heil Co Hoist
US2206957A (en) * 1939-07-01 1940-07-09 Atwood & Morrill Co Inc Power operated valve system
US2327942A (en) * 1941-05-08 1943-08-24 Petroleum Heat & Power Co Valve assembly
CA451779A (fr) * 1948-10-12 Bendix Aviation Corporation Cylindre hydraulique et structure de piston
US2517061A (en) * 1945-03-09 1950-08-01 Glenn L Martin Co Valve
US2981290A (en) * 1957-04-16 1961-04-25 Thomas B Meyer Valve construction
US2991631A (en) * 1959-08-24 1961-07-11 Gen Controls Co Reverse cycle refrigeration system and four-way transfer valve for same
US3199536A (en) * 1960-09-01 1965-08-10 Union Tank Car Co Three-position electromagnetic valve

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA451779A (fr) * 1948-10-12 Bendix Aviation Corporation Cylindre hydraulique et structure de piston
US1718673A (en) * 1927-03-31 1929-06-25 Fritz A Wettstein Fluid-pressure regulator and return motion therefor
US2148616A (en) * 1937-05-15 1939-02-28 Heil Co Hoist
US2206957A (en) * 1939-07-01 1940-07-09 Atwood & Morrill Co Inc Power operated valve system
US2327942A (en) * 1941-05-08 1943-08-24 Petroleum Heat & Power Co Valve assembly
US2517061A (en) * 1945-03-09 1950-08-01 Glenn L Martin Co Valve
US2981290A (en) * 1957-04-16 1961-04-25 Thomas B Meyer Valve construction
US2991631A (en) * 1959-08-24 1961-07-11 Gen Controls Co Reverse cycle refrigeration system and four-way transfer valve for same
US3199536A (en) * 1960-09-01 1965-08-10 Union Tank Car Co Three-position electromagnetic valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680713A (en) * 1970-11-09 1972-08-01 Snorkel Fire Equipment Co Fluid power device
US5294090A (en) * 1992-11-25 1994-03-15 Orbit Valve Company Valve snubber
US20110253539A1 (en) * 2008-11-05 2011-10-20 Mohamed Reda Akdim Electrostatic coalescer with resonance tracking circuit
US9321055B2 (en) 2008-11-05 2016-04-26 Fmc Technologies, Inc. Gas electrostatic coalescer
US9440241B2 (en) * 2008-11-05 2016-09-13 Fmc Technologies, Inc. Electrostatic coalescer with resonance tracking circuit
US9962712B2 (en) 2008-11-05 2018-05-08 Fmc Technologies, Inc. Separating primarily gas process fluids in an electrostatic coalescer

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FR1417141A (fr) 1965-11-12
GB1088478A (en) 1967-10-25

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