US3918349A - Device for controlling the reciprocation of a working piston - Google Patents

Device for controlling the reciprocation of a working piston Download PDF

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Publication number
US3918349A
US3918349A US448211A US44821174A US3918349A US 3918349 A US3918349 A US 3918349A US 448211 A US448211 A US 448211A US 44821174 A US44821174 A US 44821174A US 3918349 A US3918349 A US 3918349A
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passage
chamber
valve
port
hollow rod
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US448211A
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English (en)
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Thomas Nussbaumer
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ADEOLA AG
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ADEOLA AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet valves

Definitions

  • a two-way valve selectively connects a control block to the operating pressure and to atmo- 56] References Cited sphere and the control block is connected to the fluid pressure storage source.
  • the control block includes a UNITED STATES PATENTS pair of fluid pressure responsive valve assemblies. 1.441.759 l/1923 Schwennker 91/442 2.985.490 5/1961 Gates 1 137/6275 X 5 Cl 2 D F. 3.093153 6/1963 Horowitz 137/102 rawmg gums US. Patent Nov. 11, 1975 Sheet 1 of2 3,918,349
  • This invention relates in general to the construction of control devices for operating fluid pressure controlled pistons and, in particular, to a new and useful device which includes a control block connected between an operating fluid pressure source and a storage container maintained under fluid pressure and an operating piston which is movable in a cylinder.
  • a mechanically actuated two-way directional control valve with five ports is used, through which compressed air is selectively admitted to the respective one of the cylinder spaces on one side of the piston and the cylinder space at the opposite side of the piston is simultaneously connected to the outer atmosphere for removing the counterpressure.
  • Such an arrangement is suitable in cases where the control valve can be located at a small distance from the drive unit. If greater distances must be considered, however, the piston under pressure in the drive unit is prevented from a rapid displacement because losses in the long connection line make the pressure difference too small and the air escapes too slowly.
  • the directional control valves are designed as solenoid operated valves and mounted directly on the drive unit while the actuating mechanism is located at any convenient place. Nevertheless, in this arrangement, a shortcoming not to be under estimated is that electric lines are necessary in addition to the pneumatic ones and the help of an electrician is needed for the wiring, inspection and maintenance. Further difficulties occur, for example, in spaces which are humid or involve explosive hazards. That is why, frequently, a slowly working pneumatic equipment is preferred to the electric one.
  • a device for reciprocating a drive piston comprises a two-way control valve with three ports and a control member including a differential piston displaceable in a three-step bore and formed with end portions having unequal crosssectional areas and with a narrower portion therebetween.
  • the bore is axially limited by a smaller-and a larger end surface with each of these surfaces having an opening, the smaller one for a direct connection of a compressed air source and the larger one for connection of the directional control valve.
  • the valve is connected to a compressed air source and to the open air so that in accordance with the position of the valve, the large end of the bore is connected either to the compressed air source or to the outer atmosphere.
  • a bypass is provided in the zone of the large end of the bore and, in the zone of its middle diameter, the bore communicates with an air vent.
  • two connection ports for lines leading to the drive unit are located so that, in each end position of the differential piston, one of the two ports communicates with the respective neighboring end opening of the bore and the other port communicates with the air vent.
  • control members must be located close to and, if possible, immediately adjacent the drive unit.
  • the directional valve which is connected to the control member through a single line may be located at a relatively large distance without incurring time lags due to air escape because air escapes into the atmosphere directly from the control member.
  • this arrangement has a not negligible drawback in the limited possibilities of its application.
  • the differential piston is sealed against its guiding surfaces by a plurality of O-rings causing great frictional resistances.
  • a certain minimum pressure difference between the operating and the atmospheric pressure must be maintained permitting at any time to displace the piston without difficulties.
  • two pressure lines are necessary between the valve and the control member.
  • another device of this type differing from the prior art and comprising a directional control valve with five ports and two distinct positions, a compressed air container, and a control element connected to the latter through pressure lines, in which the control element is formed in its interior with two pairs of conical surfaces including an inner conical surface and an outer conical surface and with two bores each terminating in the center of the respective surface, and a cap-shaped seal is provided between each of the pairs of surfaces and mounted freely displaceable so that each seal hermetically closes one of the bores in both the one and the other end position, the bore of the first inner conical surface being Connected through a line to the input-output port of the directional control valve, the bore of the adjacent first outer conical surface being connected to an outlet port, the space between the two first conical surfaces communicating both with a connection port leading to one of the working spaces of the pneumatic unit and with the bore of the second inner conical surface, the space between the latter and the second outer conical surface communicating
  • the present invention is directed to the problem of eliminating these remaining drawbacks appearing in devices of the mentioned type.
  • a device is provided comprising a control part which does not require a too high precision of adjustment of the individual valves mounted therein and still ensures a completely satisfactory operation.
  • a further object of the invention is to provide a device for controlling the reciprocation of a working piston which is simple in design, rugged in construction, and economical to manufacture.
  • FIG. 1 is a partial'schematic sectional view of a device for controlling the reciprocation of a working piston constructed in accordance with the invention.
  • FIG. 2 is a view similar to FIG. 1 indicating the parts in the other end position.
  • the invention embodied therein comprises a pneumatic drive unit, generally designated 1, which is connected to a control block 2 for controlling the drive unit.
  • a compressed air container 3 and a directional control valve 4, with three ports and two distinct positions, are connected to the control block 2 through separate pressure lines 3a and 4a respectively.
  • the pneumatic drive unit 1 includes a pressure cylinder 1a in which a working piston lb is mounted for reciprocating motion.
  • the working piston 1b subdivides the inner space of the cylinder 1a into two spaces and 1d of which, in the present example, the space 1c shown at the lefthand side of the drawing, is the working space, i.e., the space in which the air is under pressure and acts on the piston during the working stroke.
  • Each of the two spaces is connected, through respective pressure lines 1e, 1 f, to respective connection ports a and 34a provided in control block 2.
  • Directional control valve 4 is formed with three ports of which one is connected through a pressure line 4a to control block 2 and the other two are connected to a compressed air source (not shown) through a line 4b, and the other is connected directly to the outer atmosphere through vent line 40.
  • a compressed air source not shown
  • the valve 4' either compressed air is directed from the line 4b into the control block 2 or compressed air is evacuated from the control block into the open air through line 40.
  • the compressed air container 3 serves as a pressure reservoir and is connected to the control block 2 connected to a line 3a through a central port in chamber 29.
  • the control block is a metal body assembled of several parts joined together and formed with a plurality of bores, passages, and chambers in which rods, valve members and other particular parts are mounted.
  • location or direction such as left, right, lateral, above, below, horizontal and vertical are used in accordance with the representation in the present drawings.
  • the real position of the control block relative to the drive unit will not necessarily correspond thereto.
  • a stepped bore is provided, having a narrower inner portion 5b and a wider outer portion 5a.
  • the opening of the bore in the lateral surface is hermetically closed by a cap-shaped cover 6.
  • a cylindrical body 7 is tightly received in the inner portion Sb of the bore, sealed by means of two gasket rings 8a and fixed by a guard ring 8b which is engaged in a corresponding groove provided in the bore wall.
  • a circular groove 5c formed at the opening of the outer portion 5a of the bore in the lateral wall, retains an elastic diaphragm 9 by which the bore is closed.
  • the diaphragm 9 engages the circular groove 5c by its border and is squeezed and firmly held in its position by the rim of cover 6.
  • the interior space 6a of cover 6 is substantially cyclindrical, its diameter corresponds to that of the outer portion 5a of the bore, and its depth is equal to the depth of the bore portion 5a reduced by the thickness of the diaphragm 9.
  • the sealing is assured by two gasket rings 11a, 1 lb, each retained in a circular groove provided in coaxial bores 12 and 13a, 13b of cover 6 and cylindrical body 7, respectively, the gasket ring 11b being located in the portion 13a of the guide bore of the cylindrical body 7 and the portion 13b having a larger diameter relative to the outer diameter of rod 10 in this Zone.
  • Rod 10 extends through the center of the elastic diaphragm 9 and is secured firmly thereto.
  • rod 10 in its portion close to cover 6, rod 10 is formed with a flange-shaped collar which, at its side facing the diaphragm 9, is provided with a circular groove into which a sealing ring 10b is inserted.
  • a rotationally symmetrical metal cap 10c is fixed to the rod 10 between the collar 10a and the diaphragm 9, the convex side of cap 10c being turned to the diaphragm 9 and the largest diameter of the cap being slightly smaller than the diameter of the inner space 6a of cover 6.
  • a second metal cap 10d is fixed to the rod 10.
  • the two metal caps 100, I011 serve as limiting stops abutting against either the shoulder formed by the different diameters of the bore portions 5a, 5b, or against the inner front face of the cover 6, thereby defining a first, inner end position of the rod 10 shown in FIG. 1,
  • the intermediate space 6a formed by the interior of cover 6 and the wider bore portion 5a serves as the control chamber and is sub-divided into two compartments by diaphragm 9. g
  • the end portion of rod 10 extending through the cover 6 is formed with a cross bore 10f through which the interior of the rod 10 communicates with the outside of the control block 2.
  • a bell-shaped top 14 is provided at the end of rod 10, with its cavity turned to the cover 6, and is fixed by means of a nut 14a.
  • the escaping air is deviated and does not flow out as a jet.
  • the cylindrical body 7 is formed, at its end facing the interior of control block 2, with a coaxial cylindrical recess or main valve chamber 15 whose depth is approximately equal to a third of the bodylength.
  • the recess 15 has a larger diameter than the bore 13b in the central part of the cylindrical body which terminates rearwardly in a circular rim 16 projecting into the recess and which forms a main valve seat.
  • the bottom of bores 5a and 5b include is formed a cylindrical coaxial recess 17 in which a helical spring 18 is received.
  • the free end of spring 18 carries a cylindrical main valve shutter 19 and urges the same in the direction of the main valve seat 16.
  • the length of the hollow rod 10 is exactly dimensioned so that, in its first end position represented in FIG. 1, the rod extends through the main valve seat 16 thereby displacing the main valve shutter or valve disc 19 from the seat 16. Simultaneously, the main valve disc l9closes the frontal opening of the hollow rod 10. In the second end position of the rod 10, shown in FIG. 2, the open end of the rod 10 does not project beyond the main valve seat 16 so that the shutter 19 is applied against the seat. In this position, the bore portion13b communicates with the interior of the hollow rod 10. The combination of the rod 10 with the seat 16 and the valve disc 19 forms a two-way directional control valve with three openings.
  • a passage 20 is provided in the control block 2 extending perpendicularly to the hollow rod 10 and leading from the upper part of the block to a cross bore 21 of the cylindrical body 7.
  • the cross bore 21 terminates in the wider bore portion 13b so that the passage 20 communicates or can communicate with the recess 15.
  • Another passage 22 extends from the bottom part of the control block 2 up to the level of the recess 17 where it terminates in the area within the helical spring 18 thereby opening into the recess 15.
  • the passage 22 communicates with the outside of the control block 2 through a connection port 22a to which the line 4a, leading from the directional control valve 4 and serving as a feeding and control line, is connected.
  • the passage 20 terminates in a connection port 20a which is connected by a pressure line 1e to the working space 16 of the drive unit.
  • the passage 20, cross bore 21, bore portion 13b and recess 15 serve as a main valve chamber and, with the passage 22, they form the main conduit of the control block 2.
  • the main valve chamber 15 By the main valve chamber 15, the main conduit is divided into two portions of which one is located at the drive unit side and the other at the control line side.
  • the control block 2 is formed with a multiple-step bore comprising five coaxial portions 23a, 23b, 23c, 23d and 23a and having an axis parallel to the hollow rod 10.
  • Theoutermost portion 23a is cylindrical and it is the largest portion both in diameter and'in length. Its length is approximately equal to the total length of all of the other four portions.
  • the second portion 23b is also cylindrical and its diameter is only slightly smaller so that a circular shoulder is formed between the two portions. The length of the second portion 23b is about one-eighth of the length of the first portion 23a.
  • the next portion 23c is cylindrical again and about 2% times longer than the preceding portion 23b and its diameter is smaller by about the double length of portion 23b.
  • the subsequent portion 23d- is tapered, narrowing inwardly down to a diameter which is approximately equal to the double length of portion 23b.
  • the innermost portion 23e is a cylindrical blind hole having a conical bottom. The last two portions are crossed by and communicate with the full section of passage 20 so that communication is established between the five portion bore and the step of the main conduit which is located at the drive unit side.
  • a rotationally symmetrical insert 24 resembling a hollow truncated cone with an annular socle is received in the multiple-step bore that the socle engages the lefthand part of portion 23a and abuts the shoulder formed between this portion and the narrower portion 23b.
  • the socle is sealed against the wall of portion 231! by a gasket ring 24a received in a circular groove.
  • insert 24 having the shape of a truncated cone, projects toward the bottom of the multiple-step bore and its frontal face lies in the plane separating the two portions 230 and 23d.
  • the insert 24 is formed with an axial bore 24b having a diameter approximately equal to that of the frontal face of the frustum so that this frontal face is actually reduced to a rim.
  • the outer boundary surface 240 of the insert 24 conically extending from the rim serves as a secondary valve seat for a secondary valve shutter or valve comprising a capshaped seal 25 of synthetic material terminated by a lip-like border.
  • the seal 25 is dimensioned so that its inner surface fits the secondary valve seat 24c and its border lip has a diameter which is only slightly smaller than the diameter of the third bore portion 231'. In a position where the seal 25 is applied against the head of the insert 24, the border lip extends up to the shoulder surface between the second and third bore portions 23b and 230.
  • a flat circular groove 24d is machined in the secondary valve seat 240, communicating with the axial bore 24b of the insert 24 through'a transverse bore 242. The function of the latter will be explained hereinafter.
  • a tubular piece 26 open at both ends is received in the outermost bore portion 23a, engaging the latter along a flange collar 26a provided on the insert and sealed by mean of a gasket ring 26b.
  • the flange collar 26b abuts on the frontal face of the socle of insert 24.
  • a cup-shaped cover 27 projecting outwardly of the control block 2 has its flanged rim applied against the flange collar 26a thereby closing the whole multiplestep bore toward the outside.
  • the cover .27, the tubular piece 26, and the insert 24 are held in their position by a guard ring 28engaging a corresponding circular groove provided in the wall of the outermost portions 23a.
  • the tubular piece 26' extends to both sides of its flange collar 26a, outwardly approximately up to the outer surface of the control block 2 and inwardly into the zone of the socle of insert 24.
  • the outer diameter of the piece 26 is smaller than that of the socle so that a cavity 29 is formed therebetween with an approximately U-shaped corss-section and communicating with the axial bore 24b of the insert 24.
  • the legs of the U-shaped cross-section extend up to the flange collar of the tubular piece 26.
  • the inner end of the tubular piece 26 is not completely open, the respective frontal face being provided only with a coaxial bore 260 having a diameter equal to that of bore 24b of the insert 24.
  • the thus formed circular bottom of the tubular piece 26 is not plane but formed with a circular rim 26d surrounding the opening of bore 26c and serving as a check valve seat.
  • a rod 30 is received in the bores 24b and 26c extending coaxially therethrough.
  • the seal is rigidly secured by means of a screw and a stiffening metal cap 25a.
  • the outer end portion of rod projecting into the tubular piece 26 carries a check valve shutter or valve disc comprising a metal support 31a and a sealing ring 31b fixed thereto and secured by a nut 310.
  • the diameter of the rod 30 is substantially smaller than that of the bores 24b, 260 so that compressed air can pass through the latter without hindrance.
  • the length of the rod 30 is dimensioned so that when the cap-shaped seal 25 is applied against the secondary valve seat 240, the check valve shutter, i.e, the sealing ring 31b. is displaced from the check valve seat 26d. This position of the rod 30 is the first and position.
  • the seal 25 is displaced from the secondary valve seat 240 and its stiffening cap 25a is applied against the tapering wall of the fourth bore portion 23d while the sealing ring 31b of the check valve shutter is pressed against the check valve seat 26d.
  • the sealing ring 31b and the seat 26d form a check valve.
  • valve is provided within the cup-shaped cover 27 and intended to permit the passage of air only in the direction from the tubular piece 26 into the cover 27 which latter communicates with the outside of the control block 2 through a bore 27a.
  • the valve includes a supporting plate 321;, a sealing disc 32c secured thereto, and a helical spring 32a resting against the bottom of cover 27 and urging the plate with the sealing disc mildly against the opening of the tubular piece 26.
  • connection port 33 is provided communicating through a passage with the second bore portion 23b in the space adjacent the outer surface of insert 24. This port 33 is connected to pressure line 3a leading to the compressedair container 3.
  • Another passage 34 extending through the control block 2 from the cavity 29 having the U-shaped crosssection upwardly is also terminated by a port 34a to which a pressure line If leading to the second space 1d of the drive unit is connected.
  • the passage 34, the cavity 29, the bore 24b, the bore portions 23d, 23c, 23b serving as the secondary valve chamber, and the passage leading to the port 33 form together a secondary conduit which is divided into two portions, namely the portion located at the side of the compressed-air container and the portion located at the drive unit side.
  • connection conduits and 36 comprising individual passages are provided in the lower part of the control block 2.
  • Conduit 35 connects the passage 22 vi. the interior 6a of the cover 6 and conduit 36 establishes a communication between the right-hand compartment of the control chamber, i.e. the bore portion 5a located at the inner side of the diaphragm 9, and the cavity 29.
  • the just described device operates as follows:
  • the directional control valve 4 For displacing the working piston 1b into its end position shown in FIG. 1, i.e., for effecting the working stroke, the directional control valve 4 is brought into a position in which compressed air flows through the pressure line 4a and the connection port 22a into the passage 2.
  • This compressed air simultaneously passes through the connection conduit 35 into the left-hand compartment of the control chamber 5a, 6a thereby acting on the diaphragm 9 so that, so far as the pressure in the right-hand compartment of the control chamber is smaller which, as will be shown in the following, is surely the case, the diaphragm 9 is deflected in the direction of the interior of the control block 2, as shown in FIG. 1.
  • the portion 20 of the main conduit located at the drive unit side also communicates with the secondary valve chamber formed by the portions 23d, 23c, and 23b of the upper bore of the control book 2 so that the compressed air also acts upon the cap-shaped seal 25 and presses the same firmly against the secondary valve seat 246. Consequently, the compressed air can not pass through the axial bore 24b into the cavity 29 and presses the elastic border lip of seal 25 toward the insert 24 thereby clearing its way through the portion 23b, the respective passage leading to the port 33, and further through the pressure line 3a into the compressed-air container 3 so that the latter is brought under operational pressure.
  • the rod 30 occupies its first and position.
  • the sealing ring 31b is displaced from the check valve seat 26d so that the check valve is open. Therefore, air coming from the space 1d of the drive unit, which is not under pressure, can freely escape through the line 1f, port 34a, passage 34, cavity 29, bore 26c, tubular piece 26, and cover 27 into the outer atmosphere.
  • the sealing disk 32c is displaced from the opening of the tubular piece 26 automatically by the outflowing air. Because all air can escape through the open check valve, there is no pressure in the connection conduit 36 either and the right-hand compartment of the control chamber is under atmospheric pressure.
  • the directional control valve 4 is reversed so that the pressure line 4a is vented. Thereupon, as soon as the pressure in the main conduit decreases, for example, at 5 atm in excess, by a half atmosphere, the elastic border lip of the seal 25 moves back, away from the insert 24, which movement is simultaneously supported by the air now flowing from the compressed-air v3 through the pressure line 3a and the secondary conduit, i.e. the port 33, valve chamber 23b, 23c, transverse bore 24e, axial bore 24b, cavity 29, passage 34, and port 34a, and through the pressure line if into the right-hand space 1d of the drive unit and act upon the piston 1b.
  • the secondary conduit i.e. the port 33, valve chamber 23b, 23c, transverse bore 24e, axial bore 24b, cavity 29, passage 34, and port 34a
  • connection conduit 36 passes through the connection conduit 36 into the right-hand compartment of the control chamber 5a, 6a, acts on the diaphragm 9 and deflects the same toward the outside because the pressure at the opposite side has been released by the venting.
  • the hollow rod 10 is thereby displaced into its second end position in which its inner end portion no more extends through the main valve seat 16 but is displaced from the main valve shutter 19 and retracted into the bore 13b while the shutter 19 is applied against the seat 16 thereby blocking the main conduit.
  • the interior of the hollow rod 10 communicates with the bore 13b so that the air coming from the left-hand space 10 of the drive unit, which is no more under pressure can pass through the line'le, port 20a, passages 20, cross bore 21, bore 13b, interior of rod 10, and cross bore 10 into the outer atmosphere.
  • a device for reciprocating the working piston of a pneumatic drive unit comprising, in combination, a directional control valve with three ports and a control element movable between two distinct positions, with a first port being connected to a source of air under pressure, a second port being connected to atmosphere, and said movable control element being selectively operable to connect the third port to either said first port or said second port; a compressed air storage container; a control block connected to both said directional control valve and said container; said pneumatic drive unit including a cylinder and a working piston therein dividing said cylinder into first and second cylinder chambers; said control block being formed with first and second interior chambers and with a first passage connecting said first interior chamber to said second interior chamber and terminating in a first connection port of said control block; a first connection line connecting said first connection port to said first cylinder chamber; a hollow rod movable axially in said first interior chamber and having an outer end projecting externally from said control block and formed with a cross bore connecting the interior of said hollow rod, at its outer
  • a device including a cover surrounding that portion of said control block where the outer end of said hollow rod projects from said control block, said cover forming a shield around the periphery of the outer end of said hollow rod so that air vented through said cross bore is not discharged directly.
  • a device including stop means on said hollow rod for limiting the movement thereof.
  • a device wherein said second interior chamber is divided into a plurality of successive chamber portions each of a different respective diameter, the first one being substantially conical and located adjacent the connection to said first passage and the remaining ones being cylindrical of increasing respective diameters said insert having a cylindrically formed axially extending portion at its periphery engageable in the last of the cylindrical portions which is of maximum diameter.
  • a device for reciprocating the working piston of a pneumatic drive unit comprising, in combination, a directional control valve with three ports and a control element movable between two distinct positions, with a first port being connected to a source of air under pressure, a second port being connected to atmosphere, and said control element being selectively operable to connect the third port to either said first port or said second port; a compressed air storage container, a control block connected to both said control valve and said container; said pneumatic drive unit including a cylinder and a working piston therein dividing said cylinder into first and second cylinder chambers; said control block being formed with a main conduit therein extending between a first connection port and a second connection port; a first connection line connecting said first connection port to said first cylinder chamber; a second connection line connecting said second connection port to the third port of said directional control valve; said main conduit having a relatively larger diameter portion intermediate its ends serving as a main valve chamber; a main valve shutter mounted in said main valve chamber for axial displacement therein between a first end position,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
US448211A 1973-03-05 1974-03-05 Device for controlling the reciprocation of a working piston Expired - Lifetime US3918349A (en)

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CH321873A CH565949A5 (de) 1973-03-05 1973-03-05

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US (1) US3918349A (de)
JP (1) JPS49119228A (de)
BR (1) BR7401609D0 (de)
CA (1) CA1002403A (de)
CH (1) CH565949A5 (de)
DE (1) DE2410183C3 (de)
ES (1) ES423944A1 (de)
FR (1) FR2220698B1 (de)
IT (1) IT1009198B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036106A (en) * 1975-04-03 1977-07-19 Southwestern Manufacturing Co. Actuator control system
US6349627B1 (en) 1996-08-21 2002-02-26 Siemens Ag Electropneumatic positioner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506469C1 (de) * 1995-02-24 1996-04-18 Honeywell Ag Doppeltwirkender elektropneumatischer Stellungsregler
DE19537493C1 (de) * 1995-09-25 1996-12-19 Siemens Ag Elektro-pneumatischer Stellungsregler

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US1441759A (en) * 1920-03-04 1923-01-09 Gen Electric Valve
US2985490A (en) * 1959-10-05 1961-05-23 Bendix Westinghouse Automotive Fluid pressure valve
US3093153A (en) * 1961-09-14 1963-06-11 Berg Airlectro Products Co Quick release valve
US3107693A (en) * 1961-05-24 1963-10-22 Robertshaw Controls Co Pneumatic relay
US3636968A (en) * 1970-10-05 1972-01-25 Watts Regulator Co Cross-connection control valve
US3850082A (en) * 1971-11-30 1974-11-26 Adeola Ag Fluid flow control elements

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Publication number Priority date Publication date Assignee Title
JPS4513104Y1 (de) * 1966-12-21 1970-06-05

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1441759A (en) * 1920-03-04 1923-01-09 Gen Electric Valve
US2985490A (en) * 1959-10-05 1961-05-23 Bendix Westinghouse Automotive Fluid pressure valve
US3107693A (en) * 1961-05-24 1963-10-22 Robertshaw Controls Co Pneumatic relay
US3093153A (en) * 1961-09-14 1963-06-11 Berg Airlectro Products Co Quick release valve
US3636968A (en) * 1970-10-05 1972-01-25 Watts Regulator Co Cross-connection control valve
US3850082A (en) * 1971-11-30 1974-11-26 Adeola Ag Fluid flow control elements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036106A (en) * 1975-04-03 1977-07-19 Southwestern Manufacturing Co. Actuator control system
US6349627B1 (en) 1996-08-21 2002-02-26 Siemens Ag Electropneumatic positioner

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DE2410183C3 (de) 1979-03-22
IT1009198B (it) 1976-12-10
ES423944A1 (es) 1976-06-01
FR2220698A1 (de) 1974-10-04
CH565949A5 (de) 1975-08-29
FR2220698B1 (de) 1979-09-28
CA1002403A (en) 1976-12-28
BR7401609D0 (pt) 1974-11-19
DE2410183B2 (de) 1978-07-06
JPS49119228A (de) 1974-11-14
DE2410183A1 (de) 1974-09-26

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