Abstract: A hydraulic system is provided. The hydraulic system may include a fluid pressure source in fluid communication with a supply line, a return line in fluid communication with a tank, a hydraulic function having a workport, a first control valve having a first proportional solenoid, a second control valve having a second proportional solenoid, and a controller. The controller being configured to selectively energize the first proportional solenoid, the second proportional solenoid, or the first proportional solenoid and the second proportional solenoid to control a system pressure differential, defined between the return line and the workport, within a range that is defined by a sum of a first predefined range defined by the first control valve and a second predefined range defined by the second control valve.

Abstract: A control device for an agricultural vehicle having a spray boom assembly for spreading material, such as fertilizer, plant protection products or seeds includes a control unit and at least two pressure control valves used for controlling an inclination of the spray boom assembly and connected to the control unit. Each pressure control valve has assigned thereto a check valve and a pressure sensor, the check valve being arranged between the pressure sensor and the pressure control valve. An agricultural vehicle and a method for operating the agricultural vehicle are arranged to spread material, such as fertilizer, plant protection products or seeds.

Abstract: A fluid power system comprises a pump with multiple independently variable outlets, each of which is capable of delivering fluid in individually controllable volume units and a plurality of hydraulic loads. A system of switching valves is configured to create fluid connections between the pump outlets and the loads. A control system commands both the pump and the switching valves, so as to create valve state combinations to satisfy load conditions as demanded by an operator. The number of pump outlets connected to one or more of the loads is changeable to satisfy the flow required of the load due to the operator demand, each pump outlet being commanded to produce a flow depending on the status of other outlets connected a load to which the outlet is connected and the operator demand for that load.

Abstract: A fluid housing for a fluid collection system or a fluid distribution system is described, which comprises at least two fluid housing modules adjoining one another along an alignment direction. On each fluid housing module at least one fluid connection is provided, which is connected fluidically to a first central fluid duct via a respectively assigned lateral fluid duct. In addition, on each of the fluid housing modules at least two contact surfaces are provided, which protrude with respect to an assigned fluid housing module basic body along the alignment direction. Adjacent fluid housing modules are positioned in relation to one another via the contact surfaces. Furthermore, a fluid collection system or a fluid distribution system with such a fluid housing is presented.

Abstract: Disclosed embodiments are directed to distributed hydraulic systems, and power machines such as excavators including distributed hydraulic systems. In the distributed hydraulic systems, electronically controlled distributor blocks are located throughout the machine, particularly along the lift arm, to locally distribute hydraulic power to actuators of the various machine and implement functions. Distributing control of hydraulics in multiple locations reduces the number of hoses that must be routed from a main control valve to the various actuators on the machine.

Abstract: A zoned fluid control system in a valve manifold system has a plurality of manifold blocks connected together and a plurality of control valves mounted to the manifold blocks with the control valves being electrically actuated and pilot pressure operated. The plurality of manifold blocks forms at least first and second separate pilot pressure passages of a respective first zone and second zone not connected to each other for supplying a respective first set and second set of control valves with independently controlled pilot pressure. A pilot supply valve selectively supplies pilot pressure and shuts off pilot pressure to the second pilot pressure passage without affecting the pilot pressure to the first pilot pressure passage thereby disabling the second set of control valves as a separate zone independent from the first set of control valves.

Abstract: A cross-flow dual valve has a supply path, an exit path, and first and second valve holes through which the supply path and the exit path communicate with each other. The cross-flow dual valve has a first intersecting path through which a supply path side of the first valve hole and an exit path side of the second valve hole communicate with each other. The cross-flow dual valve has a second intersecting path through which a supply path side of the second valve hole and an exit path side of the first valve hole communicate with each other. The cross-flow dual valve includes a first valve and a second valve. The first valve includes a first lower valve body and a first spool. The second valve includes a second lower valve body and a second spool.

Abstract: The present invention relates to a valve assembly system including channel valve assemblies. More particularly, the invention relates to a valve assembly system including channel valve assemblies and connecting modules and the tire pressure management system made therewith.

Abstract: A valve assembly system including a supply valve assembly, a control valve assembly and a connecting module and the tire pressure management system made therewith.

Abstract: One or more techniques regarding an atmosphere controlling manifold are provided. For example, one or more embodiments can regard a manifold that can comprise a first channel connected to a first inlet port. The manifold can also comprise a second channel connected to second inlet port. Further, the manifold can comprise a third channel connecting the first channel, the second channel, and an outlet port. Additionally, the manifold can comprise a valve connected to the third channel and regulating fluid communication through the third channel. Moreover, the first channel, the second channel, and third channel can be defined within a body of the manifold.

Abstract: A circuit shut-off solenoid valve for a solenoid valve system can be directly integrated in a solenoid valve system without use of an auxiliary base module and can be interchangeable with any solenoid valve in the system. The circuit shut-off solenoid valve allows for modification of the flow rate of compressed air into the solenoid valve.

Abstract: The devices comprises a distributor (16) that presents distribution ducts opening out into a radial distribution face (16A), and a distributor-counterpart engaged in each other in such a manner that two main enclosures (18, 20) are provided between their opposite axially-extending faces. The device comprises a cylinder-capacity selector comprising two slides (24, 26) arranged after the other in a bore (22) of the element engaged in the other, to which are connected the main enclosures (18, 20) and at least some of the distribution ducts (30, 31). The slides are able to adopt at least three distinct configurations establishing different connections between the main ducts (18, 20) and the distribution ducts via the main enclosures, in order to be able to obtain at least three distinct operating cylinder capacities.

Abstract: A spool valve includes a valve block; a first spool, which is mounted onto one side on the inside of the valve block so as to be moved forward and backward in the lengthwise direction and includes a first notch formed on the outer circumferential surface, for controlling the connection between a first pump flow path and a first cylinder flow path through the first notch which is aligned with the first pomp flow path and the first cylinder flow path formed on the inside of the valve block, when moved according to a change in stroke; and a second spool, which is mounted onto the other side on the inside of the valve block so as to be moved forward and backward in the lengthwise direction and includes a second notch formed on the outer circumferential surface, for controlling the connection between a second cylinder flow path and a first tank flow path through the second notch which is aligned with the second cylinder flow path and the first tank flow path formed on the inside of the valve block, when moved acco

Abstract: A hydraulic circuit is disclosed. The hydraulic circuit may comprise an actuation valve configured to actuate a flow of hydraulic fluid to and from the hydraulic consumer, a first control valve in fluid communication with the actuation valve through a first pilot line and configured to displace the actuation valve to a first position when actuated, and a second control valve in fluid communication with the actuation valve through a second pilot line and configured to displace the actuation valve to a second position when actuated. The first pilot line and the second line may each have a fixed minimum back pressure sufficient to maintain dissolved air in the hydraulic fluid.

Abstract: A solenoid coil includes a coil winding that generates an electromagnetic force when a current is supplied to the coil winding. The solenoid coil also includes an electrically insulative bobbin made of an insulating material having a melting point. The bobbin includes a spool for supporting the coil winding. The spool includes a first end and a second end opposite the first end. The coil winding is positioned between the first end and the second end. The bobbin also includes a flange connected to one of the first end and the second end. A continuous ridge extends from the flange between an outer edge and studs to form a moisture barrier. The solenoid coil further includes an overmold enclosing at least a portion of the bobbin and the coil winding. The overmold bonds to the continuous ridge when the solenoid coil is heated to a temperature above the melting point.

Abstract: First and second insertion holes and first and second recessed grooves are formed such that, on a plane that is perpendicular to a first side surface and a second side surface and that includes an axis of a spool-sliding hole, the shortest distance from the axis of the spool-sliding hole to a hole wall surface of the first insertion hole, the shortest distance from the axis of the spool-sliding hole to a hole wall surface of the second insertion hole, the distance from the axis of the spool-sliding hole to a bottom wall surface of the first recessed groove, and the distance from the axis of the spool-sliding hole to a bottom wall surface of the second recessed groove are equal to one another.

Abstract: A portable oscillating compression system including an for compressing air; an accumulator tank for receiving and storing the compressed air from the air compressor; an air pressure adjustment module for modulating pressure of the compressed air when the compressed air exits the accumulator tank; a valve body assembly attached to the accumulator tank, a plurality of inflatable cuffs connected to the valve body assemble for receiving the compressed air from the valve body assembly; a controller for controlling the valve body assembly; a power supply; and a housing for containing said system.

Abstract: A manifold for use with a fluid delivery system includes a fluid inlet defining a portion of a common channel, a fluid nozzle outlet, a plunger housing of an integrated valve, a collar of a coupling mechanism, and a mounting structure. The fluid inlet, fluid nozzle outlet, plunger housing, collar and mounting structure of the manifold are integrally-constructed. A manifold assembly for use with a fluid delivery system includes at least a first and a second manifold. Each manifold includes a fluid inlet defining a portion of a common channel, a fluid nozzle outlet, a plunger housing of an integrated valve, and a collar of a coupling mechanism. The fluid inlet, fluid nozzle outlet, plunger housing, and collar are integrally-constructed, and the fluid inlet of the first manifold is received by a portion of a common channel of the second manifold.

Abstract: A main spool (24) has a throttle passage (30) that, when the main spool (24) moves to an axial other side against a first return spring (27) in a main spool insertion hole (13), communicates a pilot pressure chamber (25) with a first tank port (15) and limits a flow amount of hydraulic oil to be discharged to the first tank port (15) from the pilot pressure chamber (25). When the main spool (24) moves to the axial other side along the main spool insertion hole (13), the throttle passage (30) communicates the pilot pressure chamber (25) with the first tank port (15) before a state where a first pump port (17) is communicated with an output port (16) and a state where the output port (16) is blocked from the first tank port (15).

Abstract: A compressed air system contains a compressed air reservoir, a compressed air line system and a drive system connected on an inlet side to the compressed air reservoir by way of the compressed air line system. The drive system has a drive and a drive controller, the drive system has a valve provided so as to pneumatically separate the drive controller from the drive.

Abstract: [Object] To provide a compact, rationally designed, dual 4-port electromagnetic valve that is an electromagnetic valve having functions of two 4-port valves.

Abstract: When the stop valve is in a first shifting position, a torque-transferring shift element is sealed tight against the rest of a hydraulic system by a stop valve, such that the actuating pressure enclosed in the shift element remains essentially constant or does not decrease. The stop valve is formed and arranged in the hydraulic system such that the stop valve is held in the first shifting position by the force of a barrier pressure generated by the pump, and, upon a standstill of the pump or falling below a certain value of the pressure generated by the pump, the stop valve is automatically displaceable at least through the action of the trapped shift element pressure into a second shifting position, in which the respective shift element is connected to the rest of the hydraulic system and the shift element is open.

Abstract: A hybrid swing drive system (1) of a hydraulic construction machine includes a variable displacement hydraulic swing pump (3) operable by a prime mover (2); a hydraulic swing motor (16) for performing a swing function of the machine; an accumulator (10); a controller (244); a swing control valve assembly (15) disposed in a first hydraulic path extending from the swing pump to the swing motor, the swing control valve assembly having a first position fluidly connecting the swing pump to a first side of the swing motor and a second position fluidly connecting the swing pump to a second side of the swing motor; and an accumulator control valve (12) having an open position fluidly connecting the accumulator to the first hydraulic path at an accumulator control valve connection point and a closed position fluidly isolating the accumulator from the first hydraulic path.

Abstract: The present disclosure relates to fault detection, isolation and reconfiguration schemes, architectures and methods for use in electrohydraulic actuation systems for construction equipment. In one embodiment, a supervisory controller adapted to interface with a main controller of the construction vehicle is provided. A plurality of control nodes that interface with the supervisory controller are also disclosed, each of which includes pressure and position sensors. The nodes also include a first actuator control node for controlling operation of a first hydraulic actuator, a second actuator control node for controlling operation of a second hydraulic actuator, and a pump control node. The control system has an architecture in which faults are detected and isolated at the supervisory controller level and, where possible, within each of the control nodes at a sensor level, a component level, and a subsystem level.

Abstract: A method includes controlling a bearing fluid supply system to provide the bearing fluid to a hydrostatic bearing of the turbopump assembly. The bearing fluid includes a supercritical working fluid. The method also includes receiving data corresponding to a pressure of the bearing fluid measured at or near a bearing fluid drain fluidly coupled to the hydrostatic bearing, determining a thermodynamic state of the bearing fluid at or near the bearing fluid drain based at least in part on the received data, and controlling a backpressure regulation valve to throttle the backpressure regulation valve between an opened position and a closed position to regulate a backpressure in a bearing fluid discharge line to maintain the bearing fluid in a supercritical state in the hydrostatic bearing and/or at or near the bearing fluid drain.

Abstract: A valve assembly is disclosed. The valve assembly includes a valve housing defining a bore, a first valve, and a second valve. The first valve and the second valve are disposed within the bore and each of the first valve and the second valve include a first end and a second end. Further, the first end of the first valve and the first end of the second valve are configured to contact each other. The valve assembly further includes a pilot chamber defined within the bore. The pilot chamber is configured to receive a pilot fluid. Further, a pressure of the pilot fluid inside the pilot chamber is controlled to permit independent movement of the first valve and the second valve within the bore.

Abstract: A flow passage switching unit includes a valve body in which plural ports are formed, a spool arranged slidably in axial directions in the interior of the valve body, a spool drive unit for driving the spool in an A direction, a biasing mechanism that is configured to bias the spool elastically in the interior of the valve body, and a piston section that exerts a force on the spool in a B direction based on the pressure of a first output port.

Abstract: A proportional pressure controller includes a body having inlet, outlet, and exhaust ports. A fill valve communicates with pressurized fluid in the inlet port. A dump valve communicates with pressurized fluid from the fill valve. An inlet poppet valve opens by pressurized fluid through the fill valve. An exhaust poppet valve when closed isolates pressurized fluid from the exhaust port. An outlet flow passage communicates with pressurized fluid when the inlet poppet valve is open, and communicates with the outlet port and an exhaust/outlet common passage. An isolation valve assembly selectively isolates fluid flow to and from the inlet port or the exhaust port to achieve a zero pressure condition.

Abstract: A temporary stop water output device includes a main body, which is hollow in shape, and has one end provided with a water output port; a movable core axis, which is hollow in shape and is disposed in the main body, and has one end connected to the water output port; a connector fixing piece, which is of a cap shape, and on which is provided with a water channel, and which is located on a trajectory at other end of the movable core axis, while its inner wall is connected movably to other end of the movable core axis; and a connector, connected to inside other end of the main body through the connector fixing piece. The temporary stop water output device is simple in construction, easy to operate, in achieving good water temporary stoppage effect, and satisfying user demand in application.

Abstract: A priority function control apparatus for a construction machine and a control method thereof are disclosed, which enable an operator to set the order of preference or the extent of preference of an optional device in the case where a work is done through replacement of the optional device attached to an excavator.

Abstract: There is provided a hydraulic excavator in which the highly-accurate land leveling work is possible. A boom-lowering pilot conduit connected to a boom-lowering pilot port is provided with a boom-lowering proportional solenoid valve. When an arm dump signal for performing dump operation of an arm is included in a hydraulic pressure signal, a controller sharply increases a current value outputted to the boom-lowering proportional solenoid valve, as compared with when an arm excavation signal for performing excavation operation of the arm is included in the hydraulic pressure signal.

Abstract: A work machine includes a controller having a first storage unit that can store work machine information and rewrite the stored work machine information, and a processing unit that collects the work machine information, and stores at least one kind of the work machine information in the first storage unit when trigger information for causing the first storage unit to start storing the work machine information occurs. The controller can change from an outside at least one of the number of data prior to a trigger of the work machine information collected by the processing unit before the trigger information, the number of data subsequent to the trigger of the work machine information collected by the processing unit after the trigger information, and a time interval during which the work machine information is collected.

Abstract: A switching valve includes main valve constituted of a five-port electromagnetic switching valve settable to a closed-center position, and a residual pressure exhaust valve including an exhaust valve cavity communicating with a supply port of the main valve and two exhaust ports, two residual pressure discharge flow paths respectively communicating with the exhaust ports, two exhaust valve elements placed inside the exhaust valve cavity and driven by pressure air from the supply port to open and close the residual pressure discharge flow paths, and a release spring that biases the exhaust valve element in a direction to open the residual pressure discharge flow paths.

Abstract: A pressure reducing valve includes main and pilot valves. The pilot valve is configured to regulate a pilot pressure, and includes pilot, drain, and first control-oil ports, a first opening cross section between the first control-oil and pilot ports, a second opening cross section between the pilot and drain ports; and a pilot part. The pilot part is configured to keep the pilot pressure at least substantially constant and control the first and second opening cross sections to be open during a pressure control operation. The main valve is fluidically connected to the pilot port and includes a second control-oil port, an outlet port, a third opening cross section between the second control-oil port and the outlet port, and a control part configured to control the third opening cross section based on the pilot pressure.

Abstract: In a method or device for operating a pneumatic drive system for actuating a control valve, a pneumatic working chamber is loaded with pneumatic pressure in order to move the control valve into a desired position. At least two pneumatic control signals are supplied to the working chamber by means of electropneumatic conversion.

Abstract: A spool valve is equipped with a valve body, a spool arranged in a valve chamber such that the spool can be displaced between a first position, which allows communication between an inlet port and an outlet port, and a second position, which blocks communication between the inlet port and the outlet port, a pilot valve mechanism disposed in the valve body and which causes displacement of the spool along an axial direction under the pressure of a pilot fluid that acts on one end surface of the spool, and a spring that biases the spool toward one side in the axial direction.

Abstract: A positioning apparatus for moving connection equipment on a drilling rig is disclosed. The positioning apparatus includes a piston and cylinder having a cylinder, a piston and a piston rod. The piston and piston rod are moveable relative to the cylinder (601)from a retracted position to an extended position. The positioning apparatus further includes a transfer barrier linked to the piston and cylinder for setting a maximum extension of said piston rod.

Abstract: Systems and methods are described for actuating a plurality of pneumatic valves to positively isolate one or more pieces of equipment. A manual valve can be disposed on a supply conduit that fluidly couples each of the pneumatic valves to a fluid supply source. To place the pneumatic valves in a safe position, the manual valve can be closed, which disrupts a flow of fluid from the source. Closing the manual valve can also open a drain conduit that allows the supply conduit to be depressurized.

Abstract: A gas supply apparatus of the present invention includes: an operating valve that is placed in the middle of a piping for letting at least gas in a plant flow and that operates a valve main body by the gas flowing in the piping; a first electromagnetic valve that is placed in the middle of the piping and that opens or closes a flow of the gas to the operating valve; and a gas supply source that supplies the first electromagnetic valve with the gas. A gas discharge line of the first electromagnetic valve has a switching valve placed therein and has a second electromagnetic valve placed between the switching valve and the gas supply source. The switching valve switches between a gas discharge from the first electromagnetic valve and a gas supply to the first electromagnetic valve. When a power source is lost, the switching valve is switched to connection to the gas supply source so as to supply the first electromagnetic valve with the gas.

Abstract: A hydraulic system is disclosed. The hydraulic system may have a pump, a tank, a displacement actuator having first and second chambers, a regeneration valve, and a load-holding valve. The hydraulic system may also have a displacement control valve including a valve element, and a stationary cage portion at least partially forming a high-pressure passage fluidly connecting the pump and valve element, a low-pressure passage fluidly connecting the valve element and tank, a first displacement actuator passage fluidly connecting the valve element and first chamber, a second displacement actuator passage fluidly connecting the valve element and second chamber, a load-holding control passage fluidly connecting the valve element and load-holding valve, and a regeneration control passage fluidly connecting the valve element and regeneration valve.

Abstract: A ground force control circuit (162) for an articulated harvesting head is provided that comprises, an ECU (164); and a first hydraulic control valve (166, 170) driven by the ECU (164), wherein the first hydraulic control valve (166, 170) is coupled to at least one actuator (158, 160) and is configured to maintain a constant pressure in the at least one actuator (158, 160).

Abstract: An oil pressure regulation valve includes a spool supported in a sleeve to be slidable in an axial direction, a solenoid actuator disposed to generate an electromagnetic force for driving the spool to one axial end side, and a biasing portion configured to bias the spool to the other axial end side. The sleeve is provided with an input chamber to which an oil pressure input port is open, and an output chamber to which an oil pressure output port is open. The spool includes a land portion that is exposed to the output chamber to be biased to the one axial end side by using oil pressure in the output chamber, and the spool is movable to the one axial end side when the land portion is biased to the one axial end side by using the oil pressure in the output chamber.

Abstract: Exemplary embodiments are direct to a valve system for actuating the piston of a piston cylinder arrangement for a hydraulic or fluid device, and for actuating the piston cylinder arrangement for actuating the movable contact piece of a high-voltage circuit breaker. The system including a main control valve arrangement, having two 2/2-way valves used as main valves and which can be controlled by a pilot control valve arrangement. The main control valve arrangement directs a path for the high pressure fluid to the chamber above the piston and connects the chamber to a low-pressure tank for discharging the chamber above the piston. Two 2/2-way valves which form the pilot control valve arrangement are associated with the main control valve arrangement such that the 2/2-way valves direct or supply either a high-pressure control pressure or a low-pressure control pressure to the main control valve arrangement.

Abstract: A manual override device for controlling at least one valve in a power system includes a rod having a first end and a second end. An attachment is configured to attach to a spool of the at least one valve and includes a clearance with respect to the first end of the rod so as to allow the attachment to move with the spool, during ordinary operation of the power system, without contacting the rod. A lever is connected to the second end of the rod and is configured to activate the manual override device by moving the rod in a longitudinal direction such that the first end of the rod makes contact with the attachment to move the spool.

Abstract: A valve assembly including a housing (24?) provided with an inlet port (12?), a delivery port (14?), and an exhaust port (16?), the valve assembly further including a first movable element (32?), a first valve member (34a?) and a second valve member (26a?), the first movable element (32?) being engageable with the first valve member (34a?), engagement of the first valve member (34a?) and first movable element (32?) substantially preventing flow of fluid between the inlet port (12?) and the delivery port (14?), and the first movable element (32?) also being engageable with the second valve member (26a?), engagement of the second valve member (26a?) with the first movable element (32?) substantially preventing flow of fluid between the delivery port (14?) and the exhaust port (16?), the valve assembly further including a second movable element (26?) which divides the housing (24?) into a control chamber (22?) and a main chamber (30?) and which is movable relative to the housing (24?) under the influence of flui

Abstract: A traction valve is provided for use in combination with a relay valve. The traction valve includes a body configured for connection to a housing of the relay valve and defining inlet, outlet and traction supply ports. A first fluid control valve used for traction control is supported on the body and includes a valve member that alternately permits and prevents fluid communication between the traction supply and outlet ports in the body. The body and the first fluid control valve are configured to receive any of a plurality of interchangeable second fluid control valves between the inlet port in the body and the first fluid control valve. Each of the plurality of interchangeable second fluid control valves is configured to perform a different function such that the traction valve assumes different configurations upon assembly of the various second fluid control valves with the body and the first fluid control valve.

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: Exemplary embodiments relate to a valve arrangement for actuating a piston cylinder arrangement, that includes a pilot control valve arrangement and a main control valve arrangement, wherein both the pilot control and main control valve arrangement include a 3/2-way valve as a pilot control valve and as a main control valve. Each valve has a control-pressure, high-pressure, and low-pressure connection. Said connections are connected to each other such that the main control valve is controlled via the control-pressure connection of the pilot control valve and the pressures on the control-pressure connection of the pilot control valve and the pressures on the control-pressure connection and on the high-pressure connection of both valves, are statically inverted relative to each other. The 3/2-way valves are designed as seat valves and are only hydraulically connected to each other.

Abstract: A pressure control system remotely controls pressure within one or more remote zones, each respectively connected to an enclosure through a conduit, by controlling flow of a fluid into and out of each enclosure. The pressure of the fluid is measured within each enclosure. An estimated pressure within each zone is computed, as a function of the measured pressure in the enclosure and known characteristics of the conduit and the zone. For each zone, an inlet proportional valve and an outlet proportional valve of each enclosure is operated so as to control the input flow rate of the fluid into the respective enclosure and the output flow rate of the fluid out of the enclosure as a function of a pressure set point and the estimated pressure, thereby regulating pressure within the zone in accordance with the pressure set point.

Abstract: A hydraulic trip unit for a valve unit in a prime mover plant is described, with monitoring passages which are grouped together in a hydraulic block and interconnected forming a 2 out of 3 circuit, of which each monitoring passage is provided with a solenoid valve unit, with a power oil line connection which is provided on the hydraulic block and from which an emergency oil passage and an auxiliary emergency oil passage extend inside the hydraulic block, of which the emergency oil passage can be connected to the valve unit and the auxiliary emergency oil passage is connected via connecting lines to a solenoid valve unit in each case, wherein a first connecting line feeds a first and third solenoid valve unit, a second connecting line feeds the second and a first solenoid valve unit, and a third connecting line feeds the third and second solenoid valve unit.