US3614965A - Five-port bistable pneumatic valve unit - Google Patents

Five-port bistable pneumatic valve unit Download PDF

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Publication number
US3614965A
US3614965A US868420A US3614965DA US3614965A US 3614965 A US3614965 A US 3614965A US 868420 A US868420 A US 868420A US 3614965D A US3614965D A US 3614965DA US 3614965 A US3614965 A US 3614965A
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United States
Prior art keywords
outlet
port
chamber
chambers
valve unit
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Expired - Lifetime
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US868420A
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English (en)
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Robert Metivier
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Individual
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15CFLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00Circuit elements having moving parts
    • F15C3/04Circuit elements having moving parts using diaphragms
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401Valve members; Fluid interconnections therefor
    • F15B13/0405Valve members; Fluid interconnections therefor for seat valves, i.e. poppet valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/2496Self-proportioning or correlating systems
    • Y10T137/2559Self-controlled branched flow systems
    • Y10T137/265Plural outflows
    • Y10T137/2668Alternately or successively substituted outflow
    • Y10T137/2688Flow rate responsive
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/8593Systems
    • Y10T137/86389Programmer or timer
    • Y10T137/86405Repeating cycle
    • Y10T137/86413Self-cycling

Definitions

  • This five-port bistable pneumatic valve unit comprising a body in which an inlet port connected to a source of compressed gas, first and second outlet ports and first and second exhaust ports are formed, characterized in that it comprises a central feed chamber communicating with said inlet port and having a free valve member slidably mounted therein, first and second intermediate outlet chambers both connected on the one hand through first and second connecting passages to said central chamber, respectively, and on the other hand to said first and second outlet ports, respectively, and said first and second exhaust ports, respectively, first and second flap valves freely mounted in said first and second intermediate outlet chambers respectively for closing said first and second exhaust ports, first and second push members disposed externally of said first and second outlet chambers, respectively, and registering with said first and second exhaust
  • This invention is concerned with a five-port bistable pneumatic valve unit applicable notably to the construction of a double pneumatic oscillator.
  • bistable pneumatic devices which can be used as fundamental or basic element in a pneumatic oscillator.
  • conventional five-port distributors or bistable gates of the walleffect or Coanda effect are frequently used.
  • the conventional five-port distributor controlled by the fluid pressure is objectionable in that when it is used for constituting a pneumatic oscillator its tripping or reversing time is far from negligible if the control pressure is of the gradually varying type.
  • a sequence valve must be interposed between a time-lag device of the oscillator and the distributor control member for converting the progressive control pressure into a sudden, strong pressure pulse.
  • the wall-effect bistable gate requires a permanent output and therefore a considerable consumption of perfectly clean and dry gas, as well as an output amplifier.
  • this five-port bistable pneumatic valve unit comprising a body in which an inlet port connected to a source of compressed gas, first and second outlet ports and first and second exhaust ports are formed, is characterized in that it comprises a central feed chamber communicating with said inlet port and having a free valve member slidably mounted therein, first and second Patented Oct.
  • each push-member actuating device may be of mechanical, pneumatic, hydraulic, electric or other type.
  • each push-member actuating device comprises a membrane associated with the corresponding push member and adapted to receive a control pressure for moving said membrane and the associated push member towards the relevant flap valve.
  • bistable valve unit of this invention is pneumatically operated it can function with an extremely progressive control pressure and can be triggered almost instantaneously.
  • this bistable unit is advantageous, in comparison with wall-effect bistable units, in that it consumes compressed gas only during the tilting operation proper.
  • This pneumatic bistable unit according to the present invention is also particularly adapted for use as a double pneumatic oscillator; in fact, it is only necessary to insert a pneumatic time-lag device between each outlet port and each pneumatic control chamber.
  • the bistable pneumatic valve unit illustrated in the drawing comprises a body 1 consisting preferably of plastic and made of a plurality of assembled sections, although it is shown in the form of a unitary block in order to simplify the drawing.
  • a plurality of chambers are formed in the body 1 of substantially cylindrical configuration having a longitudinal center line x-x' and a transverse plane of symmetry y-y. These chambers comprise a central inlet or feed chamber 2, a pair of intermediate outlet chambers 3 and 4 disposed symmetrically in relation to said plane y-y', and a pair of terminal exhaust chambers 5 and 6 also disposed symmetrically in relation to said transverse plane y-y.
  • the central chamber 2 has its two longitudinal ends connected to an inlet passage 7 permitting the communication of this chamber 2 with an external pipe line 8 connected to a source of compressed air.
  • a free valve member 9 consisting of a very light-weight piston adapted to move freely in the axial direction within the chamber 2.
  • This free valve member 9 comprising a cylindrical peripheral skirt 9a and a transverse central partition 91) divide the inlet chamber 2 into two sub-chambers 2a and 2d.
  • This piston 9 acts as a valve member with respect to axial passages 10 and 11 concentric to said axis xx and connecting the central chamber 2 with the intermed ate outlet chambers 3 and 4, respectively.
  • Cup-shaped fiap valves 12 and 13 are mounted for free axial movement in said chambers 3 and 4, respectively, and adapted to close exhaust passages 14 and 15 respectively, these last-named passages being provided for connecting the outlet chamber 3 to exhaust chamber 5, on the one hand, and the other outlet chamber 4 to exhaust chamber 6, on the other hand.
  • outlet ports 16 and 17 formed in the body 1 communicate the chambers 3 and 4 to outlet pipe lines 18 and 19, respectively.
  • the exhaust chambers and 6 communicates with the surrounding atmosphere via ports 21 and 22, respectively.
  • a pair of axial and opposite push members 23 and 24 responsive to a pair of flexible membranes 25 and 26 are also disposed in said chambers 5 and 6, respectively.
  • these membranes form on the one hand the aforesaid exhaust chambers 5 and 6 and on the other hand a pair on control chambers 27 and 28 to which a control pressure can be applied through control ports 29 and 31.
  • bistable pneumatic valve unit will be described independently of its application to a double pneumatic oscillator to be described presently.
  • the outlet line 18 is pressurized and the other pipe line 19 is at the atmospheric pressure.
  • the other sub-chamber 2b which can be drained only through the annular gap left between the peripheral cylindrical skirt 9a of free valve 9 and the inner wall of chamber 2, drains off at a slower rate and the pressure in this sub-chamber is still higher than that prevailing in the other sub-chamber 2a.
  • a resultant force is exerted against the free valve 9 in the leftward direction, so that the passage 10 is again closed by this valve 9.
  • the communication between chamber 3 and the source of compressed air is discontinued, and the pressure in this chamber 3, and consequently in the outlet line 18, drops and is restored to the atmospheric value.
  • the outlet chamber 4 is caused to communicate with the inlet chamber 2, whereby Chamber 4 is filled with compressed air.
  • the pressure acting on flap valve 13 causes the latter to engage its seat and close the passage 15. Now compressed air flows through port 17 to outlet line 19. Under these conditions, the bistable pneumatic valve unit is in its second or other stable position in which the outlet line 19 is pressurized while the other outlet line 18 is at the atmospheric pressure.
  • control action exerted on push members 23 and 24 could take place in diffeernt ways, for instance by using mechanical, hydraulic or electric means,
  • the outlet line 18 is connected to the port 29 of control chamber 27 through the medium of a time-lag device comprising an adjustable throttle 32, a non-return valve 33 and a capacity 34, the throttle 32 and non-return valve 33 being branched in parallel between the line 18 and capacity 34, the latter communicating on the other hand through a pipe line 35 with the control port 29.
  • a time-lag device comprising an adjustable throttle 32, a non-return valve 33 and a capacity 34, the throttle 32 and non-return valve 33 being branched in parallel between the line 18 and capacity 34, the latter communicating on the other hand through a pipe line 35 with the control port 29.
  • the other outlet line 19 is connected to the control port 31 of control chamber 28 via another time-lag device comprising an adjustable throttle 37, a non-return valve 38 and a capacity 39, said throttle 37 and non-return valve 38 being branched in parallel between the line 19 and the capacity 39, the latter communicating via another line 41 with the control port 31.
  • the above-described double oscillator operates as follows: when the feed line 8 is connected to the source of compressed air one of the outlet pipe lines of the bistable pneumatic valve unit, for example line 18, is pressurized under the above-described conditions.
  • the air pressure produced in the outlet line 18 is converted by the timelag device 32, 33 and 34 into a delayed control pressure transmitted to control chamber 27 via pipe line 35.
  • This pressure is applied to the left-hand face of membrane 25 and this is attended by a substantially instantaneous tripping of the bistable pneumatic valve unit.
  • it is the other outlet line 19 that becomes pressurized while the initial outlet line 18 is vented to the atmosphere.
  • the non-return valve 33 permits of exhausting the capacity 34 as rapidly as possible.
  • the other time-lag device 37, 38 and 39 converts the pressure produced in outlet line 19 into a delayed control pressure transmitted via line 41 to control chamber 28.
  • the control pressure acting against the membane 26 causes in turn the tripping of the bistable pneumatic valve unit which is thus moved back from its second position to its first position.
  • the time-lags introduced by the two time-lag devices 32, 33, 34, on the one hand, and 37, 38, 39, on the other hand, are independent of each other and can be adjusted separately by properly setting the adjustable throttles 32 and 37.
  • these throttles 32 and 37 may have a constant cross-sectional passage area and the time-lag produced by these two time-lag devices may be adjusted by properly regulating the volumes of capacities 34 and 39.
  • One of the outlet lines in this case pipe line 18, may be connected via adjustable throttle means 42 (in order to vary the air output) to a member to be supplied intermittently or periodically with compressed air, for example a breathing mask or the like.
  • the bistable cell according to this invention may also be operated by using a liquid fluid instead of a gas, and in this case the ports 21 and 22 are connected to return lines leading to a reservoir containing the liquid.
  • Five-port bistable pneumatic valve unit comprising a body in which an inlet port connected to a source of compressed gas and first and second outlet ports and first and second exhaust ports are formed, characterized in that it comprises first and second outlet chambers connected directly to said first and second outlet ports and first and second exhaust ports, respectively, a cylinder-like feed chamber having two ends connected to said inlet port, a light-weight two faced, free piston slidably mounted in said cylinder-like chamber so as to divide the same into first and second separate sub-chambers, connected to said first and second outlet chambers via first and second passages, respectively, the two faces of said free piston acting as two valve elements for said first and second passages, respectively, first and second flap valves freely mounted in first and second outlet chambers respectively for closing said first and second exhaust ports respectively, first and second push members disposed externally of said first and second outlet chambers respectively and registering with said first and second exhaust ports so that they can project through said first and second passages and drivingly engage said flap valves in said outlet chambers for moving said flap valve
  • each push member actuating member comprises a membrane associated with a corresponding push member 6 and forming a control chamber to which a control pressure can be applied for moving said membrane and its companion push member towards the relevant flap valve for unseating said flap valve.
  • a valve unit according to claim 2 characterized in that two pneumatic time-lag devices, of which the time-lag constants are adjustable separately, are branched between the first and second outlet ports and the first and second control chambers formed by the membranes associated with said first and second push members respectively, whereby alternate opening of said flap valves effects movement of said free piston to alternately connect said first and second outlet ports to said inlet port.
  • each time-lag device comprises a throttle and a nonreturn valve connected in parallel between an outlet line of the bistable valve unit and a capacity communicating on the other hand via a control line with the control chamber of said bistable valve unit.
  • a valve unit according to claim 4 characterized in that said throttle has a variable cross-sectional passage area.
  • a valve unit according to claim 4 characterized in that said capacity has a variable volume.
  • valve unit characterized in that one of the outlet lines of the valve unit is connected via an adjustable throttle to an apparatus fed periodically with gas under pressure, for example a breathing mask.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pulmonology (AREA)
  • Anesthesiology (AREA)
  • Theoretical Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Emergency Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Fluid-Driven Valves (AREA)
  • Reciprocating Pumps (AREA)
US868420A 1968-10-31 1969-10-22 Five-port bistable pneumatic valve unit Expired - Lifetime US3614965A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR172192 1968-10-31

Publications (1)

Publication Number Publication Date
US3614965A true US3614965A (en) 1971-10-26

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ID=8656369

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Application Number Title Priority Date Filing Date
US868420A Expired - Lifetime US3614965A (en) 1968-10-31 1969-10-22 Five-port bistable pneumatic valve unit

Country Status (7)

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US (1) US3614965A (xx)
BE (1) BE740184A (xx)
DE (1) DE1952986B2 (xx)
FR (1) FR1588144A (xx)
GB (1) GB1236861A (xx)
LU (1) LU59603A1 (xx)
NL (1) NL6916187A (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867291A (en) * 1973-01-12 1975-02-18 Industrial Filter Pump Mfg Co Apparatus for cleaning filters
US3910303A (en) * 1973-06-08 1975-10-07 Sigge Rydberg Valve
US3971398A (en) * 1973-12-06 1976-07-27 Taylor Duane F Apparatus for augmenting venous blood flow
US4096875A (en) * 1975-03-07 1978-06-27 Pneupac Limited Pressure fluid-actuated oscillator
US4385639A (en) * 1980-12-08 1983-05-31 Automatic Switch Company Self-cycling valve
US4457331A (en) * 1982-05-24 1984-07-03 Timoshenko Grigory M Pulse hydraulic monitor
US4526190A (en) * 1981-03-09 1985-07-02 Allan David T Control valve assembly
US5344293A (en) * 1990-12-21 1994-09-06 Transpar Iberica S.A. Double diaphragm leakproof sealing device for electric windscreen washer pumps
US5957149A (en) * 1997-06-25 1999-09-28 Karg; Jeffrey A. Fluid diverter valve
EP0926354A3 (en) * 1997-12-16 2000-03-29 Smc Corporation Solenoid-controlled pilot-operated three-position switching valve
US20090218416A1 (en) * 2006-03-06 2009-09-03 Takahiro Ohashi Water Discharger

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3817091A1 (de) * 1988-05-19 1989-11-30 Draegerwerk Ag Kolben-zylindereinheit als foerdervorrichtung in einem beatmungsgeraet
DE4038499A1 (de) * 1990-12-03 1992-06-04 Draegerwerk Ag Foerdereinheit fuer ein beatmungsgeraet

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867291A (en) * 1973-01-12 1975-02-18 Industrial Filter Pump Mfg Co Apparatus for cleaning filters
US3910303A (en) * 1973-06-08 1975-10-07 Sigge Rydberg Valve
US3971398A (en) * 1973-12-06 1976-07-27 Taylor Duane F Apparatus for augmenting venous blood flow
US4096875A (en) * 1975-03-07 1978-06-27 Pneupac Limited Pressure fluid-actuated oscillator
US4385639A (en) * 1980-12-08 1983-05-31 Automatic Switch Company Self-cycling valve
US4526190A (en) * 1981-03-09 1985-07-02 Allan David T Control valve assembly
US4457331A (en) * 1982-05-24 1984-07-03 Timoshenko Grigory M Pulse hydraulic monitor
US5344293A (en) * 1990-12-21 1994-09-06 Transpar Iberica S.A. Double diaphragm leakproof sealing device for electric windscreen washer pumps
US5957149A (en) * 1997-06-25 1999-09-28 Karg; Jeffrey A. Fluid diverter valve
EP0926354A3 (en) * 1997-12-16 2000-03-29 Smc Corporation Solenoid-controlled pilot-operated three-position switching valve
US20090218416A1 (en) * 2006-03-06 2009-09-03 Takahiro Ohashi Water Discharger

Also Published As

Publication number Publication date
DE1952986A1 (de) 1970-05-06
DE1952986B2 (de) 1979-04-05
LU59603A1 (xx) 1970-01-09
NL6916187A (xx) 1970-05-04
BE740184A (xx) 1970-03-16
FR1588144A (xx) 1970-04-03
GB1236861A (en) 1971-06-23

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