US3818943A - Pneumatic memory relay - Google Patents

Pneumatic memory relay Download PDF

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US3818943A
US3818943A US28106072A US3818943A US 3818943 A US3818943 A US 3818943A US 28106072 A US28106072 A US 28106072A US 3818943 A US3818943 A US 3818943A
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poppet
housing
conduit
seat
space
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D Bouteille
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00—Circuit elements having moving parts
    • F15C3/005—Circuit elements having moving parts using loose plates or foils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00—Circuit elements having moving parts
    • F15C3/04—Circuit elements having moving parts using diaphragms
    • 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
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86622—Motor-operated
    • Y10T137/8663—Fluid motor

Definitions

  • a magnet arrangement is provided for UNITED STATES PATENTS retaining the poppet in at least one position 52325333 21132; 52525155; Iii/ 5222 5 t, 3* the 7 Q t t t 3,559,945 2/I97l Coiner 235/201 ME pressures 6 con m 3,601,155 8/1971 Brown l. l37/625.66 23 Claims, 4 Drawing Figures 2 l3 9 I6 I I I l X 1 i I I i P --4 F L E I p 5 E 2 z;
  • PAIENTEDJBNZSIBM 3.818.948 sum 3 or 3 FIG. '4
  • the present invention relates to a pneumatic control device for automatic systems, and more particularly to pneumatic relays which can be controlled by pneumatic pulses and which have a memory or operate as a flip-flop, i.e. they retain the state set by a control pulse even after the pulse has disappeared.
  • the spool canbe maintained in the position set by the control pressure pulse, by the inherent friction present in the structure, i.e., the friction between the seals needed to seal the fluids in the relay, by mechanical locking (also called mechanical detent because of its detent effect) obtained by an elastic lock that deforms during the spool movement: or by magnetic force obtained by the action of magnets that are placed at both ends of the spool.
  • mechanical locking also called mechanical detent because of its detent effect
  • these spool valve memories are provide'd with two outputs.
  • one of the output ports In the one state or position of the relay, one of the output ports is under pressure and for proper and reliable operation of the sliding parts and for satisfactory sealing. Additionally, their lifespan is limited and their cost, because of the required precision, is high.
  • poppet-type valve relays which allow switching by moving a poppet between two seats.
  • the input pressures, which are to be communicated to the output ducts, are-provided at opposite sides of the pop- I pet.
  • the relays of this type have the advantage that they I only require very short'strokes of the poppet to effect switching, so that very little wear takes place. Additionally, high precision is not required in the construction of such relays.
  • poppets are not pressure balanced, i.e., their position is affected by the action of the pressure of the fluid utilized for effecting switching, and thus different locking mechanisms must be employed to retain the poppet in a preset condition.
  • a pneumatic memory relay comprises a housing having a space interiorily therein.
  • First and second input conduits are provided in said housing, said conduits respectively having outer ends accessible exteriorly of said housing and respectively having inner ends each communicating with said space.
  • First and second seat means are respectivelyprovided at said inner ends.
  • An output conduit in said housing communicates with said space and with the exterior of said housing.
  • Poppet means is arranged to move in said space between a first position in which it-sealingly engages said first seat means and places said output conduit in communication with said second input conduit, and a second position in which it sealingly engages said second seat means andplaces said output conduit into communication with said first input conduit.
  • First and second actuating means including means for receiving set and reset signals, are provided for moving said poppet means to said second and first positions respectively, in response to application of said set and reset signals. Retaining means are provided for retaining said poppet means in at least one of said positions, absent the application of the respective signal.
  • said retaining means comprises magnetic means in the form of a permanent magnet.
  • Said poppet means is in this case made from a magnetizable material such as ferrous metal and is in the form of a flat disk, each flat surface of the disk being arranged to sealingly engage a different one of said seat means.
  • an associated relay means has an auxiliary output conduit and cooperates with said memory relay, being provided with conduit means which communicates with said first and second input conduits as well as with said means for receiving said set and reset signals.
  • Two complementary signals normally appear at said output .seat 2 so that the pressure P does conduits alternatively, in'response to the application of the set and reset signals.
  • Means are provided in the associated'relay means which cooperate with said conduit means for generating at said auxiliary output conduit an output signal which is complementary to that appearing at the first-mentioned output conduit.
  • the single output relay illustrated in FIG. 1 comprises a poppet l which is made of ferrous metal and is in form of a flat disk.
  • the poppet is arranged to move between two positions in a space 1 provided interiorly of the housing 15.
  • Seats 2 and 3 are provided at opposite sides of the space 1' and are arranged to be engaged by respective ones of the major surfaces of the poppet 1 when the latter is in one of the two positions.
  • the seats 2 and 3 are preferably made from an elastomeric material, such as rubber, which is capable of providing a good seal when the poppet 1 comes into contact therewith.
  • An inlet conduit 4 provided in the housing 15 has an outer end accessible exteriorly of the housing, and an inner end which is bounded by the seat 2 and communicates with the space 1.
  • the conduit 4 is arranged to receive a fluid under a predetermined pressure.
  • the pressure which is normally applied and which exists in the conduit 4 is represented by the reference character P.
  • the pressure P is provided by a permanent pressure supply (not shown).
  • Magnet means in the form of a permanent magnet 5, is provided in the region of the seat 2 and the poppet 1 is made from a magnetizable material which is attracted to the magnet 5. The force of attraction draws the poppet l in an upward direction, as viewed in FIG. 1, to insure a good seal between the poppet l and the not appear in the relay beyond the conduit 4.
  • An output conduit 15' has an inner end in communication with the space I and an outer end which is externally accessible.
  • the output conduit 15 is provided .to communicate the'pressure conditions in the space 1 to the exterior of the housing the thus provided output signal being represented by the reference character S.
  • a further inlet conduit 6 has an outer end communicating with the exterior of the housing 15 and an inner end communicating with the space 1 through a seat 3 which bounds the inner end of this conduit.
  • the conduit 6 is arranged to receive a fluid at a predetermined pressure.
  • the conduit 4 is supplied with a fluid at a pressure above atmospheric pressure, while the conduit 6 is placed at atmospheric pressure.
  • the inlet conduit 6 extends through the housing 15, and the exhaust port 6a of the conduit 6 is schematically illustrated as communicating with the. atmosphere.
  • the memory relay When the poppet 1 is in the upper position so that the conduits 6 and 15 communicate with each other, the memory relay is said to be in the 0" state, that is that its output S is at a relative pressure of zero. Stated another way, the 0 state of the relay indicates that the pressure S at the output or outer end of the conduit 15 is at atmospheric pressure.
  • Actuating means are provided which can move the poppet from the position wherein it engages one seat, to a position where it engages the other seat.
  • the actuating means are adapted to bring the poppet 1 into abutment against the seat 3, and include a'conduit 4 arranged to receive fluid under pressure, particularly to receive pneumatic pulses X, which will hereinafter be referred to as set signals.
  • set signals When a set signal is transmitted to the conduit 4', the pneumatic control pulse is applied to one side of a diaphragm 9 which is movable in a downward direction.
  • the diaphragm Upon the application of a set signal X, the diaphragm deforms downwardly and causes an actuating member 10, in the form of a fork or bifurcated member having a portion extending towards the space 1, to abut against the poppet l and more the same towards the seat 3.
  • an actuating member 10 in the form of a fork or bifurcated member having a portion extending towards the space 1, to abut against the poppet l and more the same towards the seat 3.
  • the magnetizable poppet l is attracted by the magnet 5, this attraction being effective to normally retain the poppet 1 in abutment against the seat 2.
  • the poppet l nevertheless remains under the decreased influence or attraction of the permanent magnet 5.
  • the diaphragm 9 is arranged to deform sufficiently so as to cause the bifurcated actuating member 10 to move in a downward direction, as shown in FIG. 1, by a distance sufficient to urge the poppet 1 towards seat 3 until engagement has been effected.
  • a pneumatic pressure applied in the conduit 6' operates on a diaphragm 11 which is arranged to deflect in the direction of the space 1'.
  • a piston 8 has a portion configurated to pass into and extend through the seat 3, and another portion which is adjacent to the diaphragm 11. Upon deformation or flexing of the diaphragm 11, the piston 8 is urged in an upward direction, as viewed in FIG. 1, the portion extending through the seat 3 abutting against the poppet l to urge the same to move towards the seat 2.
  • the lifting of the poppet I from seat 3 is facilitated by making the cross section of the diaphragm 11 as well as the cross section of the portion of the piston engaging therewith greater than the effective cross-section of seat 3.
  • the poppet l returns into abutment against the seat 2, atwhich time the conduit is again placed into I communication with the conduit 6 so that the memory relay is again placed into the 0 state.
  • the poppet 1 remains in the 0 state even after the disappearance of reset signal X and only reverts to the state l when a set signal X appears at the conduit 4'. Because of this characteristic, the relay is said to have a memory since it retains its 0 state indefinitely if no external control pulses are applied to it. In order to assure the memory function, it is necessary that the forces which act on the S is the effective cross-sectional area of seat 3,
  • S is the active area of the diaphragm 9
  • Sn is the active area of diagram 11
  • F will be relatively small and F which can easily be regulated by limiting the distance between the poppet and the magnet 5 by means of the poppet stop 12, will be relatively high. Because all of these above variables may be easily modified by changing the seat cross-sectional areas, etc., the inequalities may readily be satisfied and proper operation can reliably be obtained. This versatility similarly exists for a wide range of working pressures P sufficient to meet most applicatrons.
  • Push buttons 13 and 14 are manual overrides which permit changing the states of the memory relay by simple manual control. Upon depressing of a respective pushbutton, a force is exerted on a respective diaphragm 9 or 11 which has the same effect as the forces exerted by the pressures on said diaphragms caused by the control signals X and X respectively. Thus, pushbutton 13 sets the memory to state 1 and pushbutton 14 resets it to state 0.
  • the housing 15 is composed of molded plastic and the holding or mounting parts 16, 1-7 and 18 are press fitted in the housing.
  • the parts 16-18 are advantageously provided with annular sharp edges that achieve sealing and also firmly maintain the parts in the housing. With such sealing means, no threads are necessary, and the relay assumes a very compact form, which may be built very economically.
  • the present invention is not, however, limited to this construction and other economical methods of construction can also be used in the framework of the invention, as for example, assembling by riveting, snapping-together of elastic parts or ultrasonic welding of plastic parts, etc.
  • a particular advantage of the relay in accordance with the present invention is the feature of the relay which permits automatic resetting in case of failure or lackof supply pressure P.
  • the attraction force F;, of magnet 5 on poppet l is very low when the latter abuts against the seat 3.
  • the force F is generally sufficient to pull the poppet 1 towards the seat 2 when the pressure P equals zero, even if the poppet weight has to be overcome.
  • This automatic reset feature in case of lack or failure of supply pressure P is useful and, indeed, important in some automatic systems.
  • a second magnet 19 is provided to hold or maintain the poppet l in abutment against the seat 3, even after the supply pressure P is removed.
  • the seat 3 which no longer serves to hold the poppet l by pressure differentials applied thereacross, may have its effective cross-sectional area reduced to a minimum so that X reset signals, when applied to diaphragm 11, can overcome both the force generated by the magnet 19 and the force generated by the pressure P applied to the effective cross-sectional area of seat 3.
  • the memory that has just been described in conjunction with FIGS. 1-3, comprises a single output memory.
  • the single output S at the conduit 15' is either in communication with the greater pressure P of the conduit 4 or with the lower or atmospheric pressure of the conduit 6.
  • These input pressures, as described above, can selectively be applied to the output conduit 15' by the application of suitable set and-reset signals to the conduit 4 and the conduit 6 respectively.
  • the just described memory relay may be modified by connecting to the same a NOT relay in the form of a switch 20.
  • the switch is in communication with the conduit 4 via a conduit 21.
  • the pressure P taken from the input conduit 4 can be selectively applied to the output S and the output S which is the inverse of the output S.
  • the actual construction of the NOT relay is known and does not form part of the present invention.
  • the NOTrelay 20 is adapted for connection to the memory relay as shown.
  • Conduit means are provided in the housing, including the conduit 21 which is in communication with the conduit 4.
  • the pressure P is simultaneously applied to the conduits 4 and 21, the latter being bounded by a seat 2' having a smallei effective cross section.
  • the conduit 22 of the NOT relay is in communication with the space 1.
  • a control signal X is supplied to the conduit 4', the control pulse is applied to the diaphragm 9.
  • the second output of the memory relay is designated by reference S to indicate that it is the complement of the output S.
  • duit 6 is also applied to the diaphragm 23.
  • the pressure P exerts a force on the poppet 24.
  • the pressure differential on the poppet 24 causes the l atter.to abut against the seat 3 and thereby the output S is essentially at the pressure P this being the supplement of the output S.
  • the basic memory relay is in the state since the output S of the concuit is at the 0 while the auxiliary output S is in the 1 state. Accordingly, when the main relay is set, as described above, the pressure in the space I rises to the pressure P. Since conduit 22 communicates the pressure in the space 1' to the diaphragm 23, the latter, via a piston 23', urges the poppet towards the seat 2. In the set position of the main relay, therefore, the relay has its output at S at the 0 level.
  • the above described memory function very much used in automation, has heretofore remained difficult and costly to obtain in penumatic devices as compared to the memory functions obtained with electrical or electronic devices.
  • the pneumatic memory relays with magnetic locking achieve the object of this invention 'dependably, and the relays are easy to construct in miniaturized form.
  • a pneumatic relay of this type makes the use of such relays practical in many applications where up to this point they have been impractical.
  • a pneumatic memory relay comprising a housing having a space interiorly therein: first and second input conduits in said housing, said conduits respectively having outer ends accessible exteriorly of said housing and respectively having inner ends each communicating with said space; first and second seat means respectively provided at said inner ends; an output conduit in said housing comm juxtaposing with said space and with the exterior of said housing; poppet means arranged to move in said space between a first position in which said poppet means sealingly engages said first seat means and places said output conduit in communication with said second input conduit, and a second position in which said poppet means sealingly engages said second seat means and places said output conduit into communication with said first input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions, respectively, in response to application of said set and reset signals; and retaining means for retaining said poppet means in at least one of said positions absent the application of the respective signal, wherein said retaining means comprises magnetic means, wherein said poppet means is made from a magnetiz
  • a pneumatic memory relay comprising a housing having a space interiorly therein; first and secondinput conduits in said housing, said conduits respectively having outer ends accessible exteriorly of said housing and respectively having inner ends each communicating with said space; first and second seat means respectively provided at said inner ends; an output conduit in said housing communicating with said space and with the exterior of said housing; poppet means arranged to move in said space between a first position in which said poppet means sealingly engges said first seat means and placessaid output conduit in communication with said second input conduit, and a second postion in whichsaid poppet means sealingly engages said second second seat means and places said output conduit into communication with said first input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions respectively, in response to application of said set and reset signals; and retaining means for retaining said poppet means in at least one of said positions absent the application of the respective signal, wherein said first and second input conduits are connected to stronger first and weaker second sources of pressure, respectively,
  • said retaining means comprises means automatically operative after said poppet means has been moved to said first position thereof for maintaining said poppet means in said first position even in the absence of a reset signal and even in the absence of operation of one of both of said sources of pressure, and automatically operative after said poppet means has been moved to said second position thereof for maintaining said poppet means in said second position even in the absence of a set signal and even in the absence'of operation of one or both of said sources of pressure.
  • a pneumatic memory relay comprising a housing having a space interiorly therein; first and second input conduits in said housing, said conduits respectively having outer ends accessible exteriorly of said housing cation with said second input conduit, and a second position in which said poppet means sealingly engages said second seat means and places said output conduit into communication with said first input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions, respectively, in response to application of said set and reset signals; and retaining means for retaining said poppet means-in at least one of said positions absent the application of the respective signal, wherein said retaining means comprises magnet means, wherein said poppet means is made from a magnetizable material, wherein said first and second seat means are spaced from each other; and wherein said magnet means is positioned in the region of one of said seat means and is so selected that it retains said poppet means in the position associated with said one seat means when said first and second input conduits are atmospheric pressure.
  • a pneumatic memory relay comprising a housing move in said space between a first position in which said poppet means sealingly engages said first seat means and places said output conduit in communication with said second input conduit, and a second position in which said poppet means sealingly engages said second seat means and places said output conduit into communication with said first input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions, respectively, in response to application of said set and reset signals; and retaining means for retaining said poppet means in at least one of said positions absent the application of the respective signal, wherein said first actuating means comprises an actuating member having a first movable portion and at least one second portion extending towards said space and arranged to abut against said poppet means in response to movement of said first portion toward said space; and diaphragm means adjacent to said first portion and arranged to displace said actuating member so as to abut against said poppet means in response to receipt of a set signal, to thereby urge said pop
  • aid retaining means comprises magnetic means positioned in the region of said first seat means, and said poppet means is of magnetizable material, whereby said, poppet means is attracted towards said first seat means subsequent to being urged from said second position by said actuating member.
  • said prising means for establishing in at least one of said input conduits a predetermined pressure different from I atmospheric pressure
  • said retaining means comprises means automatically operative after said poppet means has been moved to said first position thereof for maintaining said poppet means in said first position even in the absence of a reset signal and even in the absence of said predetermined pressure, and automatically operative after said poppet means has been moved to said second position thereof for maintaining said poppet means in said second position even in the absence of a set signal and even in the absence of said predetermined pressure.
  • a pneumatic memory relay comprising a housing having a space interiorly therein; first andsecond input conduits in said housing, said conduits respectively having outer ends accessible exteriorly of said housing and respectively having inner ends each communicating with said space; first and second seat means respectively provided at said inner ends; an output conduit in said housing communicating with said space and with the exterior of said housing; poppet means arranged to move in said space between a first position in which said poppet means sealingly engages said first seat means and places said output conduit in commication with said second input conduit, and a second postion in which said poppet means sealingly engages said second seat means and places said output conduit into communication with saidfirst input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions, respectively, in response to ap plication of said set and reset signals; and retaining means for retaining said poppet means in at least one of said positions absent the application of the respective signal, wherein one of two complementary output signals appears at the output conduit; and further comprising-associated relay
  • a pneumatic memory relay comprising a housing having a space interiorly therein; first and second input conduits in said housing, said conduits respectively having outer ends accessible exteriorly of said housing and respectively having inner ,ends each communicating with said space; first and second seat means respectively provided at said inner ends; an output conduit in said housing communicating with said space and with the exterior of said housing; poppet means arranged to move in said space between a-first position in which said poppet means sealingly engages said first seat means and places said output conduit in communication with said second input conduit, and a second position in which said poppet means sealingly engages said second seat means and places said output conduit into communication with said first input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions, respectively, in response to application of said set and reset signals; means for establishing in at least a predetermined one of said input conduits a predetermined pressure which when said poppet means is in the position thereof sealingly engaging the seat means associated with said predetermined one of said input conduits exert
  • saidretaining means comprises means automatically operative after said poppet means has been moved to said first position thereof for holding said poppet means in said first position even in the absence of a reset signal and even in the absence of said predetermined pressure, and automatically operative after said poppet means has been moved to said second position thereof for holding said poppet means in said second position even in the absence of a set signal and even in the absence of said predetermined pressure.
  • a pneumatic memory relay comprising a housing having a space interiorly therein; first and second input conduits in said housing, said conduits respectively having outer ends accessible exteriorly of said housing and respectively having inner ends each communicating with said space; first and second seat means respectively provided at said inner ends; an output conduit in said housing communicating with said space and with the exterior of said housing; magnetically attractable poppet means arranged to move in said space between a first position in which said poppet means sealingly engages said first seat means and places said output conduit in communication with said second input conduit, and a second'position in which said poppet means sealingly engages said second seat means and places said output conduit into communication with said input conduit; first and second actuating means including means for receiving set and reset signals for moving said poppet means to said second and first positions, respectively, in response to application of said set and reset signals; and magnetic retaining means operative after said poppet means has been moved to said first position thereof for holding said poppet means in said first position even in the absence of a reset signal by applying to said poppet means a magnetic attracting

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Multiple-Way Valves (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Fluid Pressure (AREA)
US28106072 1971-08-18 1972-08-16 Pneumatic memory relay Expired - Lifetime US3818943A (en)

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FR7130746A FR2149322B1 (enrdf_load_stackoverflow) 1971-08-18 1971-08-18

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AU (1) AU469774B2 (enrdf_load_stackoverflow)
BE (1) BE787709A (enrdf_load_stackoverflow)
BR (1) BR7205630D0 (enrdf_load_stackoverflow)
CA (1) CA971441A (enrdf_load_stackoverflow)
CH (1) CH564695A5 (enrdf_load_stackoverflow)
DE (1) DE2240716C3 (enrdf_load_stackoverflow)
ES (1) ES405930A1 (enrdf_load_stackoverflow)
FR (1) FR2149322B1 (enrdf_load_stackoverflow)
GB (1) GB1406875A (enrdf_load_stackoverflow)
IT (1) IT964009B (enrdf_load_stackoverflow)
SE (1) SE386961B (enrdf_load_stackoverflow)
SU (1) SU629899A3 (enrdf_load_stackoverflow)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2544304A1 (de) * 1974-10-07 1976-04-08 Telemecanique Electrique Magnetisch gehaltenes pneumatisches zustandsspeicherelement
US4105047A (en) * 1974-12-06 1978-08-08 Fairchild Industries, Inc. Valve apparatus
US5007447A (en) * 1989-02-13 1991-04-16 Quiet S.A. Pneumatic feed safety apparatus with re-setting control
FR2654176A1 (fr) * 1989-11-03 1991-05-10 Briffault Sa Detendeur de gaz a securite vis-a-vis d'une crevaison de la membrane.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2278972A1 (fr) * 1974-07-19 1976-02-13 Crouzet Sa Relais-memoire pneumatique
FR2348523A1 (fr) * 1976-04-16 1977-11-10 Telemecanique Electrique Circuit de commande pour cellule de phase pneumatique et module pour sa mise en oeuvre
US4194533A (en) 1977-04-14 1980-03-25 La Telemecanique Electrique Control circuit for pneumatic shift register
CH689735A5 (de) * 1994-05-09 1999-09-30 Balzers Hochvakuum Vakuumventil.

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Publication number Priority date Publication date Assignee Title
US2991805A (en) * 1958-01-07 1961-07-11 Royal Mcbee Corp Pneumatic valves
US3463442A (en) * 1965-08-03 1969-08-26 Henryk J Leskiewicz Multi-input diaphragm logic element
US3559945A (en) * 1969-04-28 1971-02-02 Westinghouse Air Brake Co Diaphragm operated fluid logic valves
US3601155A (en) * 1970-02-02 1971-08-24 Westinghouse Air Brake Co Pneumatic logic valve device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991805A (en) * 1958-01-07 1961-07-11 Royal Mcbee Corp Pneumatic valves
US3463442A (en) * 1965-08-03 1969-08-26 Henryk J Leskiewicz Multi-input diaphragm logic element
US3559945A (en) * 1969-04-28 1971-02-02 Westinghouse Air Brake Co Diaphragm operated fluid logic valves
US3601155A (en) * 1970-02-02 1971-08-24 Westinghouse Air Brake Co Pneumatic logic valve device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2544304A1 (de) * 1974-10-07 1976-04-08 Telemecanique Electrique Magnetisch gehaltenes pneumatisches zustandsspeicherelement
US4105047A (en) * 1974-12-06 1978-08-08 Fairchild Industries, Inc. Valve apparatus
US5007447A (en) * 1989-02-13 1991-04-16 Quiet S.A. Pneumatic feed safety apparatus with re-setting control
FR2654176A1 (fr) * 1989-11-03 1991-05-10 Briffault Sa Detendeur de gaz a securite vis-a-vis d'une crevaison de la membrane.

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DE2240716B2 (de) 1979-07-05
ES405930A1 (es) 1975-07-16
IT964009B (it) 1974-01-21
BE787709A (fr) 1972-12-18
CH564695A5 (enrdf_load_stackoverflow) 1975-07-31
FR2149322B1 (enrdf_load_stackoverflow) 1976-05-28
ZA725564B (en) 1973-05-30
DE2240716A1 (de) 1973-03-01
SU629899A3 (ru) 1978-10-25
GB1406875A (en) 1975-09-17
DE2240716C3 (de) 1980-03-13
AU4558772A (en) 1974-02-21
CA971441A (en) 1975-07-22
SE386961B (sv) 1976-08-23
AU469774B2 (en) 1976-02-26
BR7205630D0 (pt) 1973-09-25
FR2149322A1 (enrdf_load_stackoverflow) 1973-03-30

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