Abstract: A pneumatic control device includes a functional assembly that has an interruption valve device for the selective opening or interruption of at least one main working channel used for the pneumatic control of a pneumatic actuator. The functional assembly also contains a manually actuatable valve device that is connected to the interruption valve device by means of at least one auxiliary working channel and which enables manual pneumatic control of the connected actuator, if the at least one main working channel is interrupted by the interruption valve device at the same time. A process control device can also be equipped with a control device of this type.

Abstract: A pneumatic control device includes a functional assembly that has an interruption valve device for the selective opening or interruption of at least one main working channel used for the pneumatic control of a pneumatic actuator. The functional assembly also contains a manually actuatable valve device that is connected to the interruption valve device by means of at least one auxiliary working channel and which enables manual pneumatic control of the connected actuator, if the at least one main working channel is interrupted by the interruption valve device at the same time. A process control device can also be equipped with a control device of this type.

Abstract: A double valve includes a first unitary valve assembly and a second unitary valve assembly. Each unitary valve assembly includes a first outlet port, a second outlet port, and a spool. A first pilot assembly and a second pilot assembly are coupled to the first unitary valve assembly and the second unitary valve assembly, respectively. A plate is coupled to the unitary valve assemblies and includes a passage to provide a first common outlet passage that is coupled to the respective first outlet ports of the unitary valve assemblies and a second common outlet passage that is coupled to the respective second outlet ports of the unitary valve assemblies. When the spools are in a first position, fluid flows through the first common outlet passage, and when the spools are in a second position, the fluid flows through the second common outlet passage.

Abstract: A double valve includes a first unitary valve assembly and a second unitary valve assembly. Each unitary valve assembly includes a first outlet port, a second outlet port, and a spool. A first pilot assembly and a second pilot assembly are coupled to the first unitary valve assembly and the second unitary valve assembly, respectively. A plate is coupled to the unitary valve assemblies and includes a passage to provide a first common outlet passage that is coupled to the respective first outlet ports of the unitary valve assemblies and a second common outlet passage that is coupled to the respective second outlet ports of the unitary valve assemblies. When the spools are in a first position, fluid flows through the first common outlet passage, and when the spools are in a second position, the fluid flows through the second common outlet passage.

Abstract: A double valve having inlet, outlet, and exhaust ports maintains an outlet pressure below one percent of inlet pressure during a faulted state while maintaining a relatively small exhaust for reduced overall valve size. Crossover passages receive inlet pressure through main crossover poppets when the respective valve units are not in a deactuated position. When the valve units are in a deactuated position, then the crossover passages receive inlet pressure through respective bypass passages whose flow rate can be controlled independently from the size of the crossover poppets. The use of bypass passages provides particular benefits for double valves for non-press applications which have a ratio of exhaust flow coefficient to inlet flow coefficient that is less than about 2.5.

Abstract: In a control valve for use in both-hand operation provided with an AND valve (20) and a shuttle valve (21) connected to a main input ports (11a and 11b), a main switching valve (23) connected between the AND valve (20) and a main output port (12), and a tank (30) connected to an output port (21b) of the shuttle valve (21) through an aperture (26) in a valve body (10), valve holes of the AND valve (20), the shuttle valve (21), and the main switching valve (23) are pierced from an upper surface of the valve body (10), and a plate (33) for closing end portions of the valve holes and a cover (31) for forming the tank (30) are fixed in an airtight manner at the upper surface of the valve body (10), and continuous holes (33a and 33b) necessary for connecting the tank (30), the main switching valve (23), and the aperture (26) are pierced in the plate (33).

Abstract: A safety circuit for media-operated consumers, such as steam turbines or gas turbines, includes at least one first solenoid valve (1.1) which acts on a fluid circuit. An actuating device (9) can be connected to the fluid circuit, and acts at the same time on the operating behavior of the consumer. At least one other solenoid valve (1.2, 1.3) is connected at least to one of the other solenoid valves (1.1) such that only with simultaneous triggering of at least two solenoid valves (1.1, 1.2, 1.3) does at least one control valve (2.1), connected to the fluid circuit (10) act on the actuating device (9). Permanent verifiability can occur with simultaneous implementation of the safety function. A process for operating the safety circuit is also involved.

Abstract: The supply of operating air or oil to a press, shears or like machine is controlled by a pair of spool valves connected in series and each operates a pair of switches. The switches connect DC current to the solenoids via external relays which open and close the valves. The external relays are standard components on the switchboard of the machine subject to control. Sharing the control between two valves allows malfunction in either valve to indicate the system needs correction while at the same time preventing supply to the machine. The switches are coupled to the DC switchboard of the machine by cables and thus can be retrofitted.

Abstract: A double valve is constructed from first and second unitary valve assemblies each having a respective inlet port, a respective outlet port, a respective exhaust port, a respective first cross-mirror port, and a respective second cross-mirror port. A first plate is coupled to the first and second unitary valve assemblies and includes respective passages to provide a common inlet port coupled to the respective inlet ports of the first and second unitary valve assemblies and a common outlet port coupled to the respective outlet ports of the first and second unitary valve assemblies.

Abstract: A double valve is reset when a source of pressurized fluid is connected to a reset port. When the source of pressurized fluid is removed from the reset port, a first reset piston is retracted so that a second pilot chamber receives pressurized fluid while a first pilot chamber continues to be vented. A second reset piston is retracted after a predetermined delay time following retraction of the first reset piston, the predetermined delay time being sufficient to allow the second pilot chamber to become substantially pressurized. If a second pilot valve is actuated when the second reset piston is retracted, then the pressurized fluid in the second pilot chamber drives the second movable valve unit out of a deactuated position during a time that pressurized fluid in the first pilot chamber is insufficient to drive the first movable valve unit out of a deactuated position.

Abstract: A double valve for controlling a machine tool has a memory such that when the valve is in its normal deactuated state and the inlet air supply is cycled (e.g., turned from on to off or from off to on), then the valve remains in the deactuated (i.e., ready to run) state. When the valve is in a faulted state (e.g., intermediate position) and the inlet air supply is cycled, then the valve remains in the faulted state. The memory is achieved by a balanced condition of the movable valve elements when in the normal deactuated position and an unbalanced or latched condition when in the intermediate or faulted position.

Abstract: A safety valve for compressed air-operated consumers, including a valve housing having bores, and two direction control valves connected in parallel, each of the control valves having a working piston and a valve head connected to the piston. Two pilot control valves are operatively connected to the directional control valves so that each of the direction control valves is switchable by one of the pilot control valves. Each of the two valve heads is guided in a respective one of the bores in the valve housing. The housing has two cross-channels arranged to connect crosswise to each other. A first one of the pilot valves has a valve seat connected via a first pilot channel in the housing to one of the cross-channels which proceeds from the bore of one of the valve heads. A second of the pilot valves has a valve seat connected via a second pilot channel to another of the cross-channels which proceeds from the bore of another of the valve heads.

Abstract: A control valve system in which main valves are actuated and deactuated by operation of pilot valves. Actuation of pilot valves causes actuation of the main valves, which enables fluid pressure to be output from the control valve system. The main valves must shift within a predetermined time period in order to prevent an error condition. A timing chamber stores a predetermined amount of fluid to define a time period in which the main valves must shift.

Abstract: A control Valve system having a housing defining a first inlet, a second inlet, a first outlet, a second outlet, and an exhaust to define an intrinsically safe double valve. The double control valve system of the present invention further includes a pair of cross exhaust passages that eliminates the need for complicated timing devices.

Abstract: A control valve system having housing defining an inlet, an outlet and an exhaust. A first passage extends between the inlet and the outlet and a second passage extends between the outlet and the exhaust. A first plurality of valves are disposed within the first passage, each being selectively actuated to close, open, or partially open the first passage. A second plurality of valves are disposed within the second passage, each being selectively actuated to close, open, or partially open the second passage. A plurality of reset members are selectively engageable with the first plurality of valves and are operable to actuate the first plurality of valves when a pressure is applied to the plurality of reset members. The plurality of reset members each have an anti-tiedown stem extending therefrom to prevent operation of the control valve system if any of the plurality of reset members is tied down.

Abstract: A control valve system has two valve trains each of which has a series of valves which dynamically move between a deactuated position and an actuated position. An inlet of the valve system is connected to an outlet of the valve system when all of the valves are actuated and the outlet of the valve system is connected to an exhaust when all of the valves are deactuated. Each valve train includes a solenoid valve which when actuated moves the remaining valve members to their actuated position. The various valves of each valve train are interconnected with the valve of the other valve train such that actuation of all of the valves in a substantially simultaneous manner will connect the inlet of the valve system to the outlet of the valve system and deactuation of all of the valves in a substantially simultaneous manner will connect the outlet to the exhaust.

Abstract: A control valve system has two valve trains each of which has a series of valves which dynamically move between a deactuated position and an actuated position. An inlet of the valve system is connected to an outlet of the valve system when all of the valves are actuated and the outlet of the valve system is connected to an exhaust when all of the valves are deactuated. Each valve train includes a solenoid valve which when actuated moves the remaining valve members to their actuated position. The various valves of each valve train are interconnected with the valve of the other valve train such that actuation of all of the valves in a substantially simultaneous manner will connect the inlet of the valve system to the outlet of the valve system and deactuation of all of the valves in a substantially simultaneous manner will connect the outlet to the exhaust.

Abstract: A control valve system has two valve trains each of which has a series of valves which dynamically move between a deactuated position and an actuated position. An inlet of the valve system is connected to an outlet of the valve system when all of the valves are actuated and the outlet of the valve system is connected to an exhaust when all of the valves are deactuated. Each valve train includes a solenoid valve which when actuated moves the remaining valve members to their actuated position. The various valves of each valve train are interconnected with the valve of the other valve train such that actuation of all of the valves in a substantially simultaneous manner will connect the inlet of the valve system to the outlet of the valve system and deactuation of all of the valves in a substantially simultaneous manner will connect the outlet to the exhaust.

Abstract: A control valve system has two valve trains each of which has a series of valves which dynamically move between a deactuated position and an actuated position. An inlet of the valve system is connected to an outlet of the valve system when all of the valves are actuated and the outlet of the valve system is connected to an exhaust when all of the valves are deactuated. Each valve train includes a solenoid valve which when actuated moves the remaining valve members to their actuated position. The various valves of each valve train are interconnected with the valve of the other valve train such that actuation of all of the valves in a substantially simultaneous manner will connect the inlet of the valve system to the outlet of the valve system and deactuation of all of the valves in a substantially simultaneous manner will connect the outlet to the exhaust.

Abstract: A control device for controlling and monitoring two fluid valves, wherein each fluid valve comprises a drive means which is adapted for activation by an associated control signal, and a movable valve element which is biassed toward a first position in which fluid flow through the valve is prevented and which can be driven by said drive means to a second position in which fluid is able to flow through the valve, a first switch which is actuable by the displaceable element of the first valve, a second switch which is actuable by the displaceable element of the second valve, wherein each switch is biassed towards a first position and each switch can be driven to a second position when the displaceable element of the associated valve takes its second position.

Abstract: The present invention comprises a double acting actuator having a piston movable within a cylinder, a main poppet control valve connected to a fluid pressure source, and first and second poppet valves connected in series to a rod side chamber of the cylinder. The piston is extended upon actuation of both first and second poppet valves, while allowing retraction of the piston upon release of either the first or the second poppet valves.

Abstract: A safety monitoring system is provided for a pneumatic control system having a double safety valve arrangement. The monitoring system is adapted for preventing further operation of the control system in response to a malfunction of either the double safety valve or the monitoring system itself. The monitoring system preferably includes constantly dynamic monitor valves, and also preferably includes a damper feature for substantially preventing premature, undesired shutdowns of the control system in accordance with predetermined system parameters.

Abstract: A hydraulic safety valve which is controlled by two electromagnetically actuatable pilot valves is provided with two valve bodies movable in opposite direction towards each other and including control pistons for regulating the connection between one pump port, two working ports and two tank ports. Upon occurrence of a faulty switching, the valve bodies move into a hydraulically locked end position. One of both pilot valves is designed as a proportional pressure differential valve and the control pistons associated therewith are provided with fine control notches so that the valve can be proportionally controlled to thereby allow a control of the pressure buildup, the speed and direction of motion of a consumer which is connected to the valve.

Abstract: A hydraulically actuated safety valve includes two electromagnetically actuable pilot valves and is provided with two coaxial valve bodies movable in opposite direction towards each other. One of both pilot valves is designed as a proportional pressure differential valve and one of both valve bodies is provided with fine control notches. Thus, upon suitable actuation of the proportional pressure differential valve, the fine control notches clear a respective cross-section between the pump port and the working port and between the working port and the tank port to thereby allow a control of the speed and pressure buildup of a consumer such as e.g. a cylinder or a motor which is connected to the working port.

Abstract: A hydraulic safety valve which is controlled by electromagnetically actuated pilot valves includes two valve bodies movable in opposite direction towards each other for regulating the connections between a pump port, two working ports and two tank ports. Upon occurrence of a faulty switching, both valve bodies are moved in a hydraulically locked end position so that the safety valve can be operated again only after eliminating the malfunction. By coupling the safety valve with a proportional pressure reducing valve, the pressure buildup and the speed of a consumer which is connected to the safety valve can be controlled.

Abstract: A hydraulic operated control system for remotely operating a walk-behind soil compactor. A remotely operated three-position valve is connected to the pressure line of the hydraulic system of the soil compactor and serves to control the flow of hydraulic fluid to opposite ends of a hydraulic cylinder unit that is operably connected to a hydraulic pump which operates the speed and direction control for the compactor. The cylinder unit includes a piston that is slidable within the cylinder and the piston is biased to a neutral position by springs. Through remote operation of the valve, hydraulic fluid will be directed to either end of the cylinder to provide direction and speed control for the compactor. A deadman switch is located on the remote control panel and manual release of the deadman switch will open the hydraulic circuit between the opposite ends of the cylinder to prevent fluid from being directed to the cylinder and will enable the springs to return the cylinder to a neutral no speed position.

Abstract: A solenoid valve including two valve members which are operable independently each other, wherein the inlet port and the outlet port may communicate only when both valve members are operated. The solenoid valve further includes annular opening and closing members slidably fitted around the respective first valve bodies of the two valve members and the synchronizing members. The synchronizing members are movable synchronized with each valve member and are coupled to the annular opening and closing member of other valve member.

Abstract: A two hand safety control mechanism for a consumer actuated by pressure medium includes a safety valve blocking the supply of pressure medium during a faulty switching and venting the consumer. For maintaining a working position of the consumer, a plurality of control valves are provided which are dynamically self-regulating. By actuating a further control valve, the automatic retention can be cancelled in order to allow the consumer to return in its idle position.

Abstract: A safety monitor for a dual valve of the type that provides a malfunction signal when one of the valve members of the dual valve is not in its intended position. The monitor comprises a simple pressure sensing device that senses the pressure downstream of the inlet valve element of each of the valve members for sensing when a pressure exists downstream of the valve element.

Abstract: A valve position monitoring and control system incorporates a proximity sensor positioned near a movable valve element to detect the operational position of the valve and includes circuit means coupled to a valve actuating solenoid for deactivating the solenoid in the event the valve fails to respond to command signals for positioning the valve in a predetermined position. In one embodiment, the system incorporates a pair of series connected valves used in presses which valves in turn are operated by solenoid actuated pilot valves. In the event either one of the valves do not operate either by opening within a predetermined time after actuation or closing within a predetermined time after their deactuation, the system of the present invention will not permit further operation of the valves until the system has been manually reset.

Abstract: A safety valve assembly includes a pair of parallel-connected directional control valves controlled by solenoid-operated preliminary control valves; each directional control valve has a working piston and a valve member movable in a separate bore; the bores are interconnected by crossing passages and each passage is branched into a preliminary control channel communicating via a valve seat of the preliminary control valve with the working piston to admit sufficient amount of pressure medium against the working piston to switch the same over when the preliminary control valves are simultaneously operated.

Abstract: A safety valve assembly for pressurized medium-operated devices has a housing with a supply inlet, a consumer outlet, and a return outlet, two valves operating in parallel with one another, and each having a working piston and a valve member guided in chambers of the housing and operative for establishing and interrupting the communication between the inlet and outlets via two cross-passages wherein a pressure sensing element is provided having two opposite sides each communicating with a respective one of the cross-passages and displaceable in the event of malfunctions from its inoperative to its operative position so as to act in the latter position upon an actuating member arranged to turn off a consumer in response to the displacement of the pressure sensing element to its operative position.

Abstract: Means for sensing a discrepant position between two normally closed valves of a double valve assembly used to control an industrial machine such as an air-operated press clutch and brake. The indicating means comprises switch means responsive to the movement of each of the valves and so positioned that the switch means is actuated very close to the closed position of each valve. The switch means controls power to solenoid-operated pilot valves for the two main control valves of the double valve assembly. By controlling the switch means immediately adjacent the closed valve positions, the safe or closed part of the cycle is monitored for these valves, which are in themselves stable because of their normally closed nature. The switch means may be either cam-operated mechanical switches, proximity switches, photoelectric sensors, or contacts directly engageable by the inlet valve elements and utilizing the valve body itself as part of the electrical circuit.

Abstract: The invention relates to a security pneumatic control apparatus comprising an OR cell, an AND cell, a capacitor, connected to the OR cell by means of a debit regulator, and a priority cell connected to the capacitor and to the AND cell. The AND cell comprises a valve member, for engaging two seats, and a diaphragm, for moving the valve member onto one of the two seats. The cross-sections of the diaphragm and of the last mentioned seat of the AND cell are S'.sub.3 and S'.sub.2 respectively. The priority cell comprises a valve member, for engaging two seats, and a diaphragm, for moving the valve member onto one of the two seats. The cross-sections of the diaphragm and of the last mentioned seat of the prioritary cell are S.sub.3 and S.sub.1 respectively. In the invention,S'.sub.3 /S'.sub.2 <S.sub.3 /S.sub.1.When the supply pressures at the OR cell and AND cell are not equal, the security remains guaranteed for the control of dangerous machines.

Abstract: A safety valve assembly for pressurized medium-operated devices has two valves operating in parallel with one another and each having a working piston and a valve member. The assembly has a housing provided with a supply inlet, a consumer outlet and a discharge outlet. The valve members of the valves are guided in chambers provided in the housing and communicating with one another by passages which crosswise connect the chambers. The valve members in the chambers establish or interrupt communication between the inlet and outlets. When a malfunction occurs, at least one valve member blocks the cross passages so that the consumer outlet does not communicate with the inlet but, instead, is vented through the discharge outlet so that no residual pressure develops in the consumer outlet.

Abstract: A double safety valve for stamping presses and the like having a monitor responsive to asynchronous pressures, to disenable a press. The assembly comprises two valve stems each being radially supported by a piston at one end and by an outboard bearing at the other end. Each valve stem carries an inlet poppet valve adjacent one end, a spool valve on an intermediate portion and an exhaust valve adjacent the other end. Cross passages connect the inlet poppet valve of each valve stem in series with the spool valve of the other valve stem. A common outlet chamber receives pressurized fluid from both spool valves, this outlet chamber being connected in parallel to both exhaust valves. The assembly thus has the advantages of a double safety valve in which the inlet valves are in series and the exhaust valves in parallel, but is capable of being monitored by a monitor responsive to asynchronous pressures or movements.

Abstract: The coupling and brake of a press receive pressurized fluid through a safety valve. The safety valve comprises two switching valves, so that if one of the switching valves fails and cannot close the other one can be closed. The safety valve is provided with a pressure-responsive switch which generates a shut-off signal commanding that the press be shut off, in response to a variety of malfunction situations, e.g., when the switching valves are closed but nevertheless a pressure build-up is occurring, or when the switching valves are open but the pressure being furnished to the coupling and brake does not reach or suddenly drops below the threshold levels to which the coupling and brake can respond.

Abstract: Means for sensing a discrepant position between two normally closed valves of a double valve assembly used to control an industrial machine such as an air-operated press clutch and brake. The indicating means comprises switch means responsive to the movement of each of the valves and so positioned that the switch means is actuated very close to the closed position of each valve. The switch means controls power to solenoid-operated pilot valves for the two main control valves of the double valve assembly. By controlling the switch means immediately adjacent the closed valve positions, the safe or closed part of the cycle is monitored for these valves, which are in themselves stable because of their normally closed nature. The switch means may be either cam-operated mechanical switches, proximity switches, photoelectric sensors, or contacts directly engageable by the inlet valve elements and utilizing the valve body itself as part of the electrical circuit.

Abstract: A single small safety valve is furnished for use with hazardous machinery that requires simultaneous actuation and continuous pressure on two hand valves at points out of the danger zone of such machinery. Operating characteristics are achieved by a housing having an axial bore, a piston moving within that axial bore, input ports, output ports and an exhaust port located at suitable positions on the housing. The arrangement of these ports is such that open fluid communication can exist between the two input and output ports only if the input ports are pressurized within a small time interval necessary to retain the piston in a neutral position in the axial bore, and if said inputs are held to maintain pressurization during the time that it is desired to maintain pressure in the output ports. Operation of the hazardous machinery is contingent upon continuous pressurization at the output ports.

Abstract: A no tie down valve or device for the actuation of hazardous machinery. The device comprises a spool moving within a cylindrical cavity having capped ends; input ports, an output port, and an exhaust port are located at suitable positions on the cylindrical cavity wall such that a pressurized output can only be obtained if both inputs are pressurized, and subsequently held, within a small time interval determined by design parameters of the device. An equivalent construction in terms of poppet or diaphragm-type seals, which is inherently more reliable and maintainance-free than spool construction, is also described.

Abstract: Logic circuitry in combination with a limit switch on a press automatically controls the operation of the press during the press cycle without visual monitoring of the cycle by an operator.

Abstract: The specification discloses an air logic circuit with two, five port valves connected between an air supply and a volume chamber for supplying an output signal at an output port when both valves are activated substantially simultaneously. When both valves are in a released condition there is no output signal and the air supply is connected through the serial combination of both valves to a volume chamber. When either of the two valves is activated alone, the volume chamber is coupled to the atmosphere through an exhaust orifice. When both valves are simultaneously activated, the volume chamber is coupled to an output through the serial combination of both valves.

Abstract: A safety control valve for pneumatically operated cyclic machines, such as power presses and press brakes, including a pair of solenoid valves connected to a pneumatic pressure source and adapted to operate as a series flow when the system is on, and a parallel exhaust when the system is off, and with either of said solenoid valves blocking communication to the pneumatically operated cyclic machine when such valve is not operated.

Abstract: A valve assembly for a pressurized fluid line controlling a clutch and brake made up of a pair of valves having movable valve members with separate actuators, each of the valve members having inlet ports and outlet ports, the inlet ports being connected in series and the outlet ports being connected effectively in parallel so that both valves must be activated to pass the pressurized fluid to the control line and so that upon unwanted sticking of one of the valve members in activated position, pressure fluid to the control line is cut off and exhaust fluid from the line is promptly and directly vented.