Abstract: An example tool includes a hydraulic actuator cylinder; a piston slidably accommodated within the hydraulic actuator cylinder, where the piston includes a piston head and a piston rod extending from the piston head along a central axis direction of the hydraulic actuator cylinder, the piston head divides an inside of the hydraulic actuator cylinder into a first chamber and a second chamber, and the piston rod is disposed in the first chamber and configured to move one or more jaws of the tool; a pump configured to provide pressurized fluid; and a sequence valve configured to block the pressurized fluid from flowing into the second chamber of the hydraulic actuator cylinder until pressure of the pressurized fluid exceeds a threshold pressure value.

Abstract: The invention is based on the technical problem of improving the pressing in of large press fittings, said problem being solved by a device for transmitting a mechanical force for driving a pressing device for press fittings, having a storage container (4) for hydraulic fluid, having a pump cylinder (8), having a working cylinder (12), having a first line (14) for connecting the storage container (4) to the pump cylinder (8), having a second line (16) for connecting the pump cylinder (8) to the working cylinder (12), and having a third line (18) for connecting the working cylinder (12) to the storage container (4), wherein means (20) for preventing a return flow into the storage container (4) are provided in the first line (14), wherein means (22) for preventing a return flow into the pump cylinder (8) are provided in the second line (16), wherein switching means (24) for opening and closing the third line (18) are provided, and wherein the swept volume (VA) of the working cylinder (12) is configured to be gr

Abstract: The invention is based on the technical problem of improving the pressing in of large press fittings, said problem being solved by a device for transmitting a mechanical force for driving a pressing device for press fittings, having a storage container (4) for hydraulic fluid, having a pump cylinder (8), having a working cylinder (12), having a first line (14) for connecting the storage container (4) to the pump cylinder (8), having a second line (16) for connecting the pump cylinder (8) to the working cylinder (12), and having a third line (18) for connecting the working cylinder (12) to the storage container (4), wherein means (20) for preventing a return flow into the storage container (4) are provided in the first line (14), wherein means (22) for preventing a return flow into the pump cylinder (8) are provided in the second line (16), wherein switching means (24) for opening and closing the third line (18) are provided, and wherein the swept volume (VA) of the working cylinder (12) is configured to be gr

Abstract: A hydraulic pump includes a hydraulic cylinder assembly comprising a cylinder sealed by an upper head and a lower head and carrying a piston which divides the hydraulic cylinder assembly into an upper chamber and a lower chamber. A load is connected to the piston and urges it toward the lower head. A conduit connects a reversible hydraulic pump assembly in fluid flow communication with a pressurized supply of hydraulic fluid and the lower chamber for counterbalancing the load. A control system is operably associated with the reversible hydraulic pump assembly to cause hydraulic fluid to flow back and forth between the lower chamber of the hydraulic cylinder assembly and the pressurized supply of hydraulic fluid. A system is also provided to counteract leakage in the pump by adding hydraulic fluid makeup on an as needed and controlled basis.

Abstract: A hand operated hydraulic pump has a cam that is pivoted by a compensation cylinder that rotates the cam so as to move the pivot of an operating handle closer to the pump plunger as the output pressure of the pump increases.

Abstract: A hydraulic jack including a frame and a pump connected to the frame. The pump includes a rod, a housing, a piston and a plurality of valves. The rod has a cross-sectional area. The housing has an end through which the rod slides. The piston is associated with said rod, with the piston establishing a rod side chamber and a piston side chamber within the housing. The piston having a cross-sectional area. The plurality of valves each are fluidly connected to the rod side chamber and/or the piston side chamber. The piston, the rod and the valves are arranged to provide a first hydraulic fluid flow associated with the cross-sectional area of the piston until a predetermined pressure is reached and a second hydraulic fluid flow associated with the cross-sectional area of the rod after the predetermined pressure is reached.

Abstract: Pump assembly for the lift cylinder of a hand fork-lift truck includes a piston pump activated by a bar of a hand fork-lift truck and has a piston chamber and an annulus collector. A three stage control valve connects the lift cylinder with a tank in the lowered setting and connects the piston chamber with the tank in a neutral setting and in a pump setting, connects the piston chamber with the lift cylinder through a first check-valve, with the tank through a second check-valve, a third check-valve between the piston chamber and the annulus collector open to the piston chamber, and a reversing valve between the piston chamber and the annulus collector.

Abstract: A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction transmission are adapted to output a torque of the least about 160 oz-in with the gear reduction transmission being adapted to provide a gear reduction of between about 8:1 to about 15:1 or less, and the hydraulic pump being adapted to output at least about 6000 psi of pressure or more.

Abstract: A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction transmission are adapted to output a torque of the least about 160 oz-in with the gear reduction transmission being adapted to provide a gear reduction of between about 8:1 to about 15:1 or less, and the hydraulic pump being adapted to output at least about 6000 psi of pressure or more.

Abstract: A multilevel speed regulation jack includes an input oil cylinder, an output oil cylinder, and a fluid conduit member between the cylinders. The output oil cylinder includes a cylinder body containing an annular space and a tube piston, which fits in the annular space. A sliding sleeve of the tube piston is movably positioned in the annular space. An annular in-flow oil chamber is formed between the end annular surface of the tube piston and the cylinder body, and a central in-flow oil chamber is formed between the inner central surface of the piston and the cylinder body. The fluid conduit member includes at least two parallel fluid channels connected to the central in-flow oil chamber and the annular in-flow oil chamber, respectively. A control valve in one of the fluid channels opens/closes the channel. The jack can automatically switch between different jacking speeds based on the load sensed by the system and therefore has a high jacking efficiency.

Abstract: A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction transmission are adapted to output a torque of the least about 160 oz-in with the gear reduction transmission being adapted to provide a gear reduction of between about 8:1 to about 15:1 or less, and the hydraulic pump being adapted to output at least about 6000 psi of pressure or more.

Abstract: A multilevel speed regulation method for a jack and a multilevel speed regulation jack use a hydraulic speed regulation line which includes at least two parallel hydraulic sub-lines extending between the input and output cylinders and the pressure applied by the output cylinder against the load is taken as the control signal to control the opening and closure of the hydraulic sub-lines or their combination at different speed levels. Application of the method in this invention provides the jack with the capability to automatically transfer between different speed levels in the case of different loads, and thus the lifting efficiency is improved. Additionally, this invention also provides a multilevel speed regulation jack, in which a hydraulic speed regulation line of at least three speed levels is connected in series between the input and output cylinders. This hydraulic speed regulation line consists of at least two parallel hydraulic sub-lines.

Abstract: A speed regulation jack comprises at least one input cylinder and one output cylinder, and parallel hydraulic lines between the input and output cylinders. A differential oil circuit is connected between the inlet cavity and the return cavity of the output cylinder, and a control valve is connected in series between the return cavity of the output cylinder and the oil tank, and this control valve controls the return oil of the return cavity. This speed regulation jack takes the magnitude of the load as its signal and transfers automatically between different lifting speeds, thus enhancing the lifting efficiency of the jack.

Abstract: A hydraulic jack with dual pump system includes two fluid reservoirs, two pumps for pumping the hydraulic fluid from the fluid reservoirs to an inner fluid chamber of a hydraulic cylinder respectively, and two sequence valves each opening at a predetermined control pressure to enable the hydraulic fluid flowing from the inner fluid chamber back to the respective fluid reservoir, wherein the control pressure preset at the first sequence valve is smaller than that preset at the second sequence valve. Therefore, at a no load condition, the pumps are pumping the hydraulic fluid to the inner fluid chamber to speed up the lifting up of the lifting arm, and at a load condition, the first sequence valve is opened by means of a loading pressure while the second pumping means keeps pumping the hydraulic fluid to the inner fluid chamber to substantially lift up the lifting arm.

Abstract: A hydraulic jack with dual pump system includes two fluid reservoirs, two pumps for pumping the hydraulic fluid from the fluid reservoirs to an inner fluid chamber of a hydraulic cylinder respectively, and two sequence valves each opening at a predetermined control pressure to enable the hydraulic fluid flowing from the inner fluid chamber back to the respective fluid reservoir, wherein the control pressure preset at the first sequence valve is smaller than that preset at the second sequence valve. Therefore, at an no load condition, the pumps are pumping the hydraulic fluid to the inner fluid chamber to speed up the lifting up of the lifting arm, and at a load condition, the first sequence valve is opened by means of a loading pressure while the second pumping means keeps pumping the hydraulic fluid to the inner fluid chamber to substantially lift up the lifting arm.

Abstract: An actuating device for a hydraulic lifting device has a body, a piston and a lever. The body has an inlet channel communicating with an oil tank and an outlet channel connected to a cylinder. The piston is moveably received in the body to divide a chamber into an upper chamber and a lower chamber that communicates with the inlet channel and the outlet channel in the body. Two check valves are respectively received in the inlet channel and the outlet channel in the body. A slight gap is defined between the periphery of the piston and the inner surface of the chamber in the body. Accordingly, some oil in the lower chamber is allowed to flow into the upper chamber when the pressure in the outlet channel is over a desired level, and the structure of the actuating device is simple.

Abstract: A load-settable rapid lifting jack comprises a switching oil cylinder between a pump oil chamber and an inner oil tank. A little and limited hydraulic oil in the pump oil chamber is utilized to push a switching piston as the hydraulic oil flows into the switching oil cylinder; and a larger amount of hydraulic oil is provided to the inner oil tank of the jack so that the jack lifting spindle is lifted rapidly in a predetermined load. Moreover, when the load is over a rated value, a sequential valve can be opened rapidly so as to restore to a general lifted speed.

Abstract: A multilevel speed regulation method for a jack and a multilevel speed regulation jack use a hydraulic speed regulation line which includes at least two parallel hydraulic sub-lines extending between the input and output cylinders and the pressure applied by the output cylinder against the load is taken as the control signal to control the opening and closure of the hydraulic sub-lines or their combination at different speed levels. Application of the method in this invention provides the jack with the capability to automatically transfer between different speed levels in the case of different loads, and thus the lifting efficiency is improved. Additionally, this invention also provides a multilevel speed regulation jack, in which a hydraulic speed regulation line of at least three speed levels is connected in series between the input and output cylinders. This hydraulic speed regulation line consists of at least two parallel hydraulic sub-lines.

Abstract: A hydraulic raising apparatus with automatic regulated speeds can automatically adapt its raising speeds for various load conditions. It mainly comprises additional hydraulic circuits, check valves and adjustable relief valves arranged between the piston rod side chamber and the rodless side chamber of hydraulic cylinders and pumps. The arrangement enables hydraulic cylinders and pumps to change their working modes in a hydraulic circuit, depending on loaded conditions, from a piston type to a spool type and vice versa. Hence the hydraulic apparatus can adjust its raising speeds in agreement with loads. When the apparatus bears a light load, it will quickly carry the load to position. On the other hand, when the load is heavy the apparatus will move it at a slower speed and thus need just reduced input energy. Therefore, the apparatus according to the invention can enhance efficiency to the greatest extent.

Abstract: A hydraulic jack device has a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat. A hydraulic shaft is inserted through the hydraulic cylinder and connected to the rocking arm. The rocking arm is connected to the lifting seat. The pump has a main body connected to the hydraulic cylinder, a chamber formed in the main body, a piston cylinder, a piston, and a C-shaped ring. The driven rod has a round end and a hollow box end. The driven rod passes through the piston cylinder, a coiled spring, and the piston. The round end of the driven rod is inserted in the chamber. A first and a second oil channels are formed in the hydraulic cylinder.

Abstract: An oil circuit of a jack for rising an object to a preset position rapidly, wherein the oil inlet circuit of a hydraulic loop system is improved. An oil channel is installed between the inner oil chamber of the piston rod and the sequential valve. A check valve is installed between the oil channel and the sequential valve. An oil channel is installed between the sequential valve and the check valve for being connected to the inner oil chamber of the piston rod. By changing the positions of the check valve and the oil channel. When in the working conditions of dump load or light load, the sequential valve is closed, thus, the hydraulic oil may enter into the inner oil chamber of the piston rod from the pumping oil chamber through the check valve so that the piston rod will rise rapidly to a still condition. In the still condition, since the check valve closes the oil channel, the sequential valve will open automatically so that the inner oil chamber of the piston rod is communicated to the inner oil reservoir.

Abstract: The invention relates to an improved hydraulic quick lifting unit used in a jack, especially to improvements made on the valves of the hydraulic system, a fastener assembly and an oil return tube of the lifting shaft. The hydraulic system can return hydraulic liquid to the outer oil reservoir in a slow rate when the lifting shaft according to the invention bears a load. Thus the lifting shaft moves down slowly. When the load on the lifting shaft is removed, the hydraulic liquid flows back to the outer oil reservoir in a larger quantity in a short time. Hence the lifting shaft can quickly return to the its original position. Further, the fastener assembly is located between the lifting shaft and the mandrel, which has the advantages of enhancing the accuracy of the clearance between the mandrel and the inner oil reservoir of the lifting shaft, and preventing the positional shift of the mandrel in the inner oil reservoir. The invention has the benefit of enhancing the stability of product performance.

Abstract: A control unit for hand-operated hydraulic jack comprises a control handle (1), a small hand-operated pump (2), a lifting cylinder (4), an inlet pipe and an outlet pipe, wherein the inlet pipe of said lifting cylinder (4) is connected with the small hand-operated pump (2) having a back-moving spring through a lifting oil circuit having a non-return valve (3), which the small hand-operated pump (2) is controlled by the control handle (1); said lifting oil circuit with a non-return valve (3) has an underload-accelerating oil circuit for quickly lifting the load when underloaded; and a release valve is provided on the outlet pipe of said lifting cylinder (4). This unit has the function of quickly lifting the load when underloaded, as well as increasing the force for lifting load when have loaded, and it can be operated simply and reliably.

Abstract: A hydraulic tool having a frame, a conduit system in the frame, a pump in the conduit system, a ram movably connected to the frame, and a mechanical actuator provided in the conduit system for contacting a rear end of the ram. The conduit system is adapted to conduit hydraulic fluid from the pump against both the rear end of the ram and a rear end of the mechanical actuator.

Abstract: A hydraulic circuit system for one-touch jack and its structure has an inlet circuit, a return circuit and an overload protection circuit with a hydraulic cylinder, a piston rod, a sequence valve, a safety valve and a relief valve, in which the inlet circuit extends from an outer reservoir of a hydraulic cylinder via a check valve to connect to an oil chamber of a manual pump. The oil chamber of the pump is connected to an oil guide tube via another check valve, the oil guide tube is inserted into an inner oil chamber formed in a piston rod to form a closed circuit. The oil chamber of the pump is connected to an inner chamber of the hydraulic cylinder via a sequence valve and the inner chamber is connected to the outer reservoir via a check valve.

Abstract: A portable punching machine is disclosed which has a hydraulic, single acting, spring return cylinder for linearly moving a punch toward and away from a die. The cylinder is driven in turn by a hydraulic pump disposed in a fluid chamber built into the machine. The pump fluid chamber is in constant communication with a fluid control chamber accommodating an elastic air bag capable of contraction and expansion for keeping constant the amount of hydraulic oil in the pump fluid chamber. Characteristically, a spacer of polyurethane foam or like elastic material is loosely inserted in the air bag in order to prevent the mutual contact of the inside surface of the bag, such contact being undesirable because the inside surface of the bag is customarily covered with a sticky parting agent that has been used in molding the bag from rubber.

Abstract: A hydraulic circuit system for one-touch jack and its structure has an inlet circuit, a return circuit and an overload protection circuit with a hydraulic cylinder, a piston rod, a sequence valve, a safety valve and a relief valve, in which the inlet circuit extends from an outer reservoir of a hydraulic cylinder via a check valve to connect to an oil chamber of a manual pump. The oil chamber of the pump is connected to an oil guide tube via another check valve, the oil guide tube is inserted into an inner oil chamber formed in a piston rod to form a closed circuit. The oil chamber of the pump is connected to an inner chamber of the hydraulic cylinder via a sequence valve and the inner chamber is connected to the outer reservoir via a check valve. When the maximum effect capacity of the oil chamber of the piston rod, a single touch of the pump can raise the hydraulic jack to the required loading position for raising at no load or light load conditions.

Abstract: An oil pressure device for a jack whereby a hydraulic jack is adapted to raise rapidly until the lifting portion of the jack reaches a load sufficient to overcome a spring operating force, at which point the operation of the jack shifts to a slower, more powerful mode to raise the load.

Abstract: An airless hand held hydraulic pump unaffected by gravity continuously maintains pressure on the fluid in a dynamic reservoir chamber to enable pumping into a dynamic pressure chamber for actuating a forcing rod irrespective of the orientation of the pump. A release valve permits fluid return from the pressure chamber into the reservoir chamber. The pump can be fitted with a tool such as a door forcer.

Abstract: According to the invention, a valve for use with a variable speed motor and pump in an hydraulic elevator balances a fluid pressure force on a pump side of a control valve with a fluid pressure force on a cylinder side of the control valve before an elevator cab moves either upwardly or downwardly. On the pump side of the valve, a separate circuit, which is controlled by a solenoid, directs the pump fluid pressure force behind the valve until the sum of the fluid pressure acting on the pump side of the control valve overcomes the fluid pressure on the cylinder side of the control valve to open the valve.

Abstract: A valve for use in a hydraulic compression tool. The valve has a frame with a central chamber, a first inlet, a second inlet and a discharged outlet. A first gate is located at the first inlet. A plunger assembly having a first plunger member and a second plunger member are movably mounted in the central chamber with a spring biasing the plunger member against the second plunger member. The second plunger member has a conduit between the second inlet and the first plunger member. The valve has a first home position that substantially prevents fluid from flowing therethrough. The valve has a second manual release position wherein fluid can flow into the first inlet and out the discharge outlet. The valve also has a third automatic relief position such that in the event a predetermined maximum fluid pressure is exceeded a gate will open between the first plunger and the second plunger member to allow fluid to flow from the second inlet through the valve and out the discharge outlet.

Abstract: The hydraulic crimping tool includes a piston follower mechanism to provide an automatically sequentially reduced crimping force and extent of crimping deformation in predetermined manner in dependence on the extent of travel of a movable crimping jaw toward a stationary jaw.

Abstract: An actuator control system is disclosed using fluid dispensing means to selectively add or remove fluid from a closed actuator system, whereby the movement of the actuator is volume rather than pressure responsive.

Abstract: A portable hydraulic lifting jack for automobiles comprising a ram cylinder receiving a ram therein, and a plunger cylinder receiving a plunger therein so that the lift head may be hydraulically lifted as the plunger is pumped by a lever, wherein a socket for receiving the lever for activating the plunger is divided into two parts so that the distance between the fulcrum belonging to one of the two parts of the socket and the working end belonging to the other part may be varied according to the need.

Abstract: A force-delivering tool such as a log splitter wherein a pusher member carried on a cylinder is forced against a blade carried on a frame to which the piston is secured. The cylinder is driven relative to the piston by means of a reciprocating plunger carrying a cup on the end that forces fluid past a one-way valve ahead of the piston. Oil is pressurized by both the bottom of the cup and its annular end but, when resistance is encountered to build up pressure, a relief valve evacuates the annular chamber so that all the force is concentrated in the area at the bottom of the cup. The entire actuating valve may be backed away to relieve pressure as desired or at the completion of a desired stroke.

Abstract: A log splitter wherein a wedge having a cutting edge and a hydraulic power unit are arranged on one and the other ends of an I beam horizontally supported by supports, is disclosed. A log to be split is placed on the I beam between the wedge and the hydraulic power unit and is pushed towards the wedge by a ram of the hydraulic power unit. The hydraulic power unit is actuated by either air pump means or manual pump means, or by both the two means in the same time.

Abstract: A hydraulic force-delivering hand tool, such as a cable crimper, comprising a body with a large axial bore at one end forming a cylinder. A piston is slidable in the cylinder and has a nodular mass at the outer end to drive against a member to be crimped. A plunger pumps a quantity of fluid past a transfer one-way check valve and into the cylinder, to drive the piston forward a small increment each stroke. When the piston passes through its full predetermined stroke to effect a complete crimp, interengaging means on the transfer check valve and on the piston, lift the transfer check valve from its seat to prevent further travel and to relieve fluid back to the transfer chamber. A button may then be pressed to unseat a relief check valve, to relieve the cylinder to the reservoir.

Abstract: A hydraulically operated crimping tool (1) for attaching an electrical connector to an electrical conductor, consisting of a hydraulic oil reservoir (27), which is connected to a pump unit (26) which when operated will pump oil under pressure into an enclosed space (25), into which is introduced a pin (1k), said pin being so arranged as to move out of the space as pressure is applied. Upon the initial activation of the pump unit (26) oil is pumped into a small space (24) of small area and volume, where a small quantity of oil will produce large movement of the pin (1k). This movement will then cause a second enclosed space (25) of greater area and of greater volume to be filled with oil. As resistance begins to occur to the movement of the pin (1k) the pump unit (26) will pump the quantity of oil to the second enclosed space (25) of greater area.

Abstract: A manually operated log splitter is provided. The log splitter comprises a bi-ended main beam, a splitter wedge fixed at one end of the main beam, and manually operated hydraulic power means fixed to the other end of the beam. In accordance with the invention, this hydraulic power means includes a ram reciprocably moveable toward and away from the splitter wedge. A manually operated low pressure, high volume pump and a manually operated high pressure, low volume pump urge the ram toward the wedge. Automatically operable release valve means relieves pressure from the high pressure, low volume pump to the reservoir when necessary.

Abstract: A hydraulic tool comprising a cylinder which is open at one end with a piston extending partially therein, but having a substantial portion extending outside. A lateral bore through the extending portion accommodates intake and exhaust check valves, but the bore is sealed off between them, forming an inlet chamber. Surrounding the inlet and exhaust ports and sealed at its opposite ends to the piston and cylinder, respectively, is a flexible, extendable sleeve forming an annular reservoir. A transfer duct extends from the inlet chamber to a pressure chamber formed between two seals around the piston, and a longitudinal bore opens into the inlet chamber from the extending end of the piston to slidably accommodate a manually-operated pump plunger.

Abstract: In a hydraulic riveter wherein an extension on a piston carries a jaw holder containing an annular array of gripping segments with conical outer surfaces slidable on a conical inner surface of the holder, a second piston is slidable in a bore and is operative to force the segments along the wedging surface to grip a rivet. A fluid passageway brings the bore into communication with the cylinder, so that as pressure builds up in the cylinder to increase pulling force, the second piston is forced against the gripping segments with increasing force to build up clamping force on the rivet in direct relation to the pulling force of the tool.

Abstract: A manually operable hydraulic actuator which utilizes a main pump and an auxiliary pump to quickly develop a relatively large useful hydraulic force, for example, in applying compression accessories to stranded conductors such as cables. The main pump develops a relatively high pressure from a low volume of hydraulic fluid to develop the primary hydraulic force. The auxiliary pump develops a relatively low pressure from a high volume of hydraulic fluid to produce rapid advancement of a force-applying piston relative to a work piece. Both the main and auxiliary pumps are operated by the opposed swinging movement of two manually operable handles. One of the handles is selectively movable between a first position for simultaneously actuating both the main and auxiliary pumps and a second position for actuating the main pump only. A pressure relief system is provided to ensure development of the maximum rated pressure of the force-applying piston before retraction thereof can be effected.

Abstract: An improved remote control assembly for mechanically controlling the operation of a hydrostatic pump which may be used to power the attachments on a tractor-like vehicle. The assembly includes a first control unit positioned at a first remote location on the tractor and a second control unit positioned at a separate and distinct remote location. The assembly includes a control arm secured to a pump control element whose rotation controls the pump operation. A pivot arm is pivotally carried by the control arm and has a first control cable from the first control unit connected to one end and a second control cable from the second control unit connected to the opposite end.

Abstract: An improved controller assembly is utilized in a hydrostatic steering system having an engine driven pump with a servomotor which is effective to vary the displacement of the pump upon operation of a pressure responsive valve assembly. The controller assembly includes a housing having a valve chamber with an inlet port which receives fluid from the pump. Upon rotation of a steering wheel, a controller valve member is moved to an actuated position and a metered flow of fluid is conducted from the valve chamber through a motor port to a steering motor. In addition, fluid is conducted from the steering motor through another motor port to the controller valve chamber. The fluid from the steering motor is then discharged from the valve chamber to reservoir or drain through an outlet port. The controller assembly also includes a control port connected in fluid communication with the pressure-responsive valve assembly.