Abstract: A detent mechanism for a pressure control valve adapted to control the extent of deflection of each of pressure control springs to control pressure on a secondary side of each of spools to a level depending on the deflection, which is capable of causing each of solenoids to be simplified or small-sized. For this purpose, the control lever is provided with a plurality of suction elements and the solenoids are arranged to suck suction elements thereon. A position at which each of the suction elements is sucked on the solenoid is defined outside of a position at which push rods each are abutted against a forcing section of the control rod.

Abstract: A fluid valve structure is provided having spaced first and second inlet sections connected to a source of pressure fluid and a plurality of side by side valve sections between said inlet sections, each having inlet, work and tank chambers intersected by a passage open at opposite ends to a control chamber and a tank chamber at a common pressure, a valve spool movable in said passage and having both ends at a common pressure and grooves adapted selectively to connect the work chamber to the inlet or tank chamber, a lever in the control chamber removably engaging one end of the spool and rotatable about a shaft transverse to the spool axis, and an external handle means operatively engaging the shaft to rotate the lever to move the spool axially in the passage, all of the spool, lever and shaft being fully enclosed with a valve housing in all operative positions.

Abstract: A flow control and load check valve in a spool valve between a first power core (20) and the motor ports (22,24,26) for controlling the flow therebetween as a function of the differential pressure of the first power core and the inlet pressure. A piston (66) responsive to said two pressure positions a sleeve (76) to determine the flow rate. The sleeve (76) also serves as a load check.

Abstract: A magnetic detent joy stick and stack remote control valve is provided having a traction magnet detent in which a magnet plate activated by the detent is constantly urged against the coil housing to prevent dirt from getting between the coil plate and coil housing face when the power is cut off and/or the valve is in neutral.

Abstract: A fluid controller (17) is disclosed for controlling the flow of fluid to a steering cylinder (19). The controller includes a fluid meter (51) and a valving arrangement (49) including a valve spool (65) and a sleeve (67), which define a main fluid path including a main variable flow control orifice (121), the fluid meter (51), a variable flow control orifice (123), the steering cylinder (19), and a variable flow control orifice (125). In accordance with the invention, the spool and sleeve define an amplification fluid path including a variable amplification orifice (129) in parallel with the main fluid path, and disposed to amplify the flow of fluid through the meter. In one embodiment of the invention, the amplification fluid path communicates with the main fluid path upstream of the main variable flow control orifice, and at a location downstream of the fluid meter, but upstream of the variable flow control orifice (123).

Abstract: A system for hydraulically detecting the seizure of a control valve in a hydraulic servo valve system wherein a hydraulic signal generated responsive to the control valve seizure is utilized to translate a bypass valve from its operational position to its bypass position and simultaneously to provide a hydraulic signal for maintaining the bypass valve in its bypassed position.

Abstract: A wet jig mechanism for handling coal or other minerals wherein a container receives a slurry of water and coal and the water is pulsed by delivering an alternate charge of compressed air beneath the surface of the water and alternately venting the area beneath the surface with the alternate pulsing and venting controlled by a pulsing valve having valve chambers with one chamber having ports connected beneath the surface of the container and to a source of compressed air in the other chamber connected beneath the surface of the liquid in the container and vented to atmosphere with the ports being controlled by butterfly valve plates in each chamber mounted on a common shaft and the chambers having liners or bushings rotatable to control the ports and time and duration of opening of the ports.

Abstract: A multiway valve is provided having a load feedback wherein a pressure-reducing element that reduces the pressure conveyed to a connection through the valve with a control pressure signal line is controlled as a function of the displacement of a valve piston in the multiway valve.

Abstract: A hydraulic control device consists of a housing, a control slide valve displaceable in a bore of the housing, and a control ring. Axial displacement of the control slide valve makes it possible to connect together or to disconnect various connecting lines depending upon the position of the valve. Located in an annular chamber, formed between a section of the housing bore and the control slide valve is a control ring arranged coaxially with the valve and guided displaceably thereupon. Valve seats are spaced axially from each other both in the housing bore and on the control slide valve. The control ring comprises inner mating surfaces and outer mating surfaces cooperating with the valve seats. Provided between the two valve seats in the control slide valve is a flow channel running therein which is closed at one end depending upon the position of the control ring.

Abstract: A progressive hydraulic distributor with a slide for controlling a hydraulic actuator. The distributor has an internal load sensing passage that detects the operating pressure in the hydraulic fluid inlet or outlet passage and superimposes this pressure on the action of the spring of a feed valve. Thus, the difference between the up-flow and the down-flow of progressivity in the slide of the distributor is constant.

Abstract: A valve unit for use in a load sensing system having a fluid operated cylinder. The valve unit permits positioning of an implement between the raise, lower, neutral and float positions and also provides for throttling of fluid flow to the cylinders as well as priority flow to the system. Float is obtained through a lock check valve which includes a main poppet maintained in a seated position by a spring biased pilot poppet. A pilot piston is positioned coaxially opposite the main poppet and is responsive to fluid pressure in the valve to act upon the pilot poppet and unseat the main poppet. In the float position, the fluid pressure within the valve may be stand-by pressure which acts upon the pilot piston to allow it gradual decent of the implement. The pilot pressure is communicated to the pilot piston through a centrally located passage. The location of the passage permits additional lock check valves to be easily added as needed.

Abstract: A vacuum switch for interchangeably connecting a plurality of vacuum lines includes a vacuum housing having a plurality of ports to which the vacuum lines are connectable. The vacuum housing has a plurality of channels molded in one surface of a plate and communicating with the ports. Each channel has at least one passage through the plate to the opposite surface. The channels are arranged to provide the desired fluidic logic. A one-piece seal member seals the channels to maintain a vacuum therein. A plurality of valves are slidable upon the surface of the plate opposite the channels. Each valve has a cavity providing fluid communication between passages when the cavity spans a pair of passages. Electrical contacts, movable with the valves, activate a circuit to provide an electrical signal corresponding to the desired mode selected for the vaccuum lines.

Abstract: A fluid valve structure is provided having spaced first and second inlet sections connected to a source of pressure fluid and a plurality of side by side valve sections between said inlet sections, each having inlet, work and tank chambers intersected by a passage open at opposite ends to a control chamber and a tank chamber at a common pressure, a valve spool movable in said passage and having both ends at a common pressure and grooves adapted selectively to connect the work chamber to the inlet or tank chamber, a lever in the control chamber removably engaging one end of the spool and rotatable about a shaft transverse to the spool axis, and an external handle means operatively engaging the shaft to rotate the lever to move the spool axially in the passage, all of the spool, lever and shaft being fully enclosed with a valve housing in all operative positions.

Abstract: A directional control valve comprising a valve housing, tank-, user-, and pump-ports provided in said housing, a spool reciprocally mounted in said housing and adapted to connect and/or separate said ports, and a pilot controlled flow control valve within said directional control valve.

Abstract: High-pressure, micrometering valves requiring low-actuating torque are combined in a lightweight, portable pressure calibration console, housed in a common valve block. A manual pressure valve and a manual vent valve connect compressed gas from an internal storage cylinder to pressure measuring gages or transducers to be calibrated. Automatically actuated isolation valves connect and disconnect a vernier balancing cylinder assembly, permitting fine manual adjustment of calibration pressures as high as 10,000 psi. Positive shutoff combined with low-torque, fingertip control and non-jamming closure are provided by the frictionally-engaged valve components.

Abstract: A flapper actuated pilot valve is shown in which the output pressure from the valve is dependent upon and proportional to the force exerted by the flapper. The valve includes a valve body with upper and lower chambers and an interconnecting gas passage. A spring-biased poppet in the lower chamber has a primary sealing surface for sealing off the lower chamber and a secondary sealing surface which is contacted by a flapper element located in the upper chamber. The flapper element has an interior bore leading to an exhaust port in an upper end of the flapper element which extends through an opening in the valve body. The flapper element is supported within the upper chamber by means of a pressure sensitive diaphragm. The diaphragm area and primary and secondary sealing areas cooperate so that to provide an outlet gas pressure which is proportional to the external force supplied by the flapper upon the flapper element.

Abstract: A power-assist device for an automotive steering system employs spool valves of substantially identical construction and identical size to control the fluid pressure in smaller and larger area chambers of an unbalanced cylinder. For compensating difference of effective area between smaller and larger area chambers, the position of bores defned in a housing of a pressure control valve for receiving the spool valves are differed from each other so that the spool valve opening and closing an induction path for the smaller area chamber and opening closing a drain path for the larger area chamber moves at greater magnitude than that of the other spool valve which opens and closes an induction path for the larger area chamber and opens and closes an exhaust path for the smaller area chamber.

Abstract: A load responsive system including individual positive and negative load compensators, for control of positive or negative load and an external logic system for determination of whether the controlled load pressure is positive or negative. The deactivating valve deactivates the positive load compensator, when the negative load pressure exceeds a certain minimum predetermined level, preventing flow of fluid from the system pump to the system actuator controlling a negative load at a pressure higher than a certain predetermined level, and therefore preventing development of excessive pressure in the actuator, while also deactivating the negative load compensator below a certain minimum predetermined negative load pressure level and while the positive load is being controlled by the positive load compensator.

Abstract: A control valve having three motor passageways and a combination sequence and regeneration valve in a common housing, wherein the combination sequence and regeneration valve operates to prevent fluid communication between the third motor passageway and an inlet passageway when the pressure in the inlet passageway is below a first predetermined amount and permits bidirectional fluid communication between the third motor passageway and the inlet passageway when the pressure in the inlet passageway exceeds that predetermined amount.

Abstract: A pressure compensated hydraulic valve (2) is provided with a housing (4) having a reciprocal spool (6) for communicating hydraulic fluid to work ports (8,10). Pressure compensating means (58) is provided in the same housing with the valve and senses work port pressure by hydraulic fluid flow through the spool from the work port and creates a substantially fixed differential pressure across the spool by controlling the pressure after the flow has passed through the spool.

Abstract: This invention relates to a new control valve intended to be used to control the supply and exhaust of fluids to a dual tourniquet system. The tubes supplying and exhausting the tourniquets are of a flexible nature, and as such may be squeezed to stop the flow of fluids therethrough. The inventive valve includes cam members with camming projections formed thereon at various predetermined positions on the circumferences thereof. Simultaneous rotation of the cam members by a control knob results in sequential filling and emptying of the tourniquets in a predetermined sequence. The valve is especially useful in the practice of the Bier block procedure.

Abstract: Into the housing of a multiway valve a pressure balance is incorporated, the end of the control piston subjected to the load report pressure facing a housing recess in which the load report pressure obtains while the opposite end of the control piston is subjected to the supply pressure and in the opposite sense to the supply pressure to the force of a spring. The valve has a simple structure.

Abstract: A valve includes a valve housing having a valve bore with a first valve member movable therein to control fluid communication between a pump, a reservoir and a hydraulic function. The first valve member includes annular grooves which receive pressure controlled seals. A second valve member is movable in the valve bore and is connected to an actuator. The first and second valve members cooperate to form a pre-control valve which controls pressurization of the pressure controlled seals. The second valve member also connects the actuator with the first valve member so that the seals are relieved of pressure before the first valve member is moved.

Abstract: A proportional hydraulic distributor with a hollow, cylindrical compensating slide, a seat at one end of the compensating slide, a reciprocable piston, an end of which is urged against the seat by a spring, a pressure assistance chamber surrounding the seat, and a choke connecting the entry pressure of the hydraulic distributor to the pressure assistance chamber. The balance of forces on the reciprocable piston and on the cylindrical compensating slide is equal to and oppositely directed with respect to the hydrodynamic drag force that develops during transitional phases of the operation of the hydraulic distributor.

Abstract: A 4/2 type distributing control valve characterized by compactness, ruggedness and high sampling frequency, the valve comprising two index plates (6, 7), each having teeth about its perimeter, provided with axial switching bores (8, 9, 10, 11). The two switching bores for each plate are connected with a groove (12, 13) which extends over the center of the relevant index plate.

Abstract: A combined spool and rotary disc valve has a quick emergency exhausting means. In normal operation, the spool valve allows pressurized fluid to flow between an inlet and a choice of one or more outlets. When quick emergency exhausting of all of the outlets is desired, the spool valve is disposed such that all the outlets communicate through an exhaust slot in the rotary disc valve, through an interior passageway of the cylinder, further through a second part of the spool valve into a different interior passageway which leads to an annular channel which is exhausted by one or more exhaust openings through the barrel housing. The normal flow of pressurized fluid can also be reversed such that, with blockage of all exhaust openings in the barrel housing, the rotary control valve becomes a mixing valve.

Abstract: A booster steering valve control of the kind that comprises a pair of valve pistons reciprocal in a rotative valve body are driven by a fork shaped member at the end of a steering spindle. The fork shaped member comprises a pair of spaced actuator pins which engage in openings of the respective valve pistons. Thus, the valve body and the fork shaped member have a common axis about which the actuator pins rotate. A particular construction of the invention resides in the displacement of the actuator pins such that their axes are not in a common plane with the steering spindle axis but offset so that the surfaces of engagement between the actuator pins with the respective valve pistons and the spindle axis are coplanar. Engagement is maintained by spring bias acting on the valve pistons.

Abstract: A booster steering valve control device of the kind having a rotative valve body within a steering housing with a pair of piston valves operative upon rotation of a steering spindle is provided with reaction chambers at corresponding ends of the piston valves. The reaction chambers are isolated from an inlet chamber within the steering housing by means of closure caps. The closure caps are secured in place by a resilient clamp held by a bolt carried in a bore of the valve body in which the valve pistons are reciprocal.

Abstract: An electrohydraulic servovalve which includes as an integral part thereof a monitor valve which senses the absence or lack of system pressure in the first or second stages of the valve and translates in the absence thereof to deactivate load control. The torque motor of the electrohydraulic servovalve is biased, electrically or magnetically, to provide a failure indication in the first stage of the valve in the absence of or excess of applied electrical signals to the torque motor.

Abstract: The fluid distributor (D1) is intended to be stacked against similar distributors (D2); it comprises a distributor body (1) in which a slide-valve (2) may slide; this body comprises a transverse channel (8) extending from one bearing face (3) to another bearing face (4), this channel (8) being intended to be combined with at least one pressure selector (S); an upstream housing (9) is connected by a duct (10) to a zone where a working pressure is established, this upstream housing (9) being further connected laterally to said channel (8). The distributor body (1) comprises on its face (3), intended to be turned downstream, a downstream housing (16) communicating with the transverse channel (8), the upstream housing (9) of a downstream distributor (D1) coming, in a stack, opposite the downstream housing (16) of the adjacent upstream distributor (D2) so as to form the pressure selector (S).

Abstract: A steering control valve system for a crawler vehicle has four valve spool bores formed in parallel to each other at equal intervals in a valve body, four valve spools respectively inserted slidably into the four valve bores, four actuator members respectively inserted slidably into the four valve bores so as to respectively actuate the four valve spools, and a link mechanism for operatively connecting between the four actuator members and operating mediators, wherein the valve system is controlled by only a push-in operation of the valve spools. The operating mediators are steering levers and a brake pedal or electric motors and operating buttons.

Abstract: The invention relates to a hydraulic control valve assembly for controlling a consumer unit such as a servomotor of a vehicle steering system. The valve assembly has a conventional port arrangement which includes two selectively pressurizeable and drainable motor ports connectable to a servomotor and supply and exhaust ports connectable respectively to a pump and a drain tank. A slide valve has a central wall section between two motor ports which completely block a central supply port when the slide valve is in a neutral position. Two metering control load sensing ports are on opposite sides of the supply port and when the slide valve is in a neutral position the load sensing ports are in throttling relation to the slide valve motor ports.

Abstract: An improved jam compensating control valve (45) includes a spool (65) which blocks and unblocks a flow passage through the valve. The spool is slidably disposed within an inner sleeve (60) which, upon jammed interengagement with the spool moves therewith, thereby connecting drain passsages (180, 182, 185, 190 and 195) in the surface of the spool with outlet passages (120 and 125) communicating with an associated actuator (5) for actuator draining in response to such valve jamming.

Abstract: A multiposition selector valve of the rotary type includes a valve body having a single inlet port and a plurality of outlet ports. Fluid communication between the inlet port and any one of the outlet ports is provided via a check valve assembly mounted on the valve body, and via a fluid-providing conduit connected at one end to the inlet port via the check valve. The other end of the conduit is movable in rotary fashion for fluidtight engagement with any one of a plurality of valve seat areas associated with the outlet ports. The valve seat areas are integral portions of a flat metal disk that can be removed from the valve body to facilitate maintenance of the valve. A single handle rotates the conduit through its various selected outlet positions and operates the check valve assembly to open and close the valve at selected outlet positions.

Abstract: A pilot valve having a universally tiltable joy stick further includes a cam attached to said joy stick and movable therewith. A plunger is selectively movable into engagement with the cam for latching the joy stick in a selected one position. Fluid is supplied to the plunger for developing a force acting thereon to move the plunger into engagement with the cam. The fluid force is eliminated and the plunger disengaged from the cam to delatch the joy stick.

Abstract: A valve assembly with a bank or row of switching valves has a base plate of u-like cross section with two flanges and a web therebetween. Within one of the flanges there is a common supply duct and in the other there is a common air outlet duct for the valves placed on the plate. The housings of the valves are generally block-like and their inlet and outlet ports are placed in opposite sides thereof. The sides with the air outlet ports furthermore have electrical connection pins for the solenoid magnets of the valves. A common electrical plug connector is placed covering over the pins of all the switching valves. There is a single muffler for all the switching valves.

Abstract: A four-way valve with a built-in flow control function which is convertible between a two port meter-in mode and a two port meter-out mode; and, alternatively, from a two port meter-out mode to a three port meter-in mode.

Abstract: A hydraulic valve is provided which can be modified to provide priority compensation, parallel pressure compensation, inlet check functions and a float function by changing a flow through inlet valve portion in the inlet chamber of the valve.

Abstract: A hydraulic valve is provided which can be modified to provide priority compensation, parallel pressure compensation, inlet check functions and a float function by changing a flow through inlet valve portion in the inlet chamber of the valve.

Abstract: A control valve cartridge which may be seated within the end plate of an actuator cylinder has a number of two way, two position solenoid valves placed in series axially and by way of which the space on each side of the piston may be connected by a respective control valve cartridge with a high pressure source or a low pressure source so as to give a programmable choke function.

Abstract: A valve assembly (16) for use in a fluid system (10) includes a flow control valve (82) which controls fluid flow between a fluid inlet port (34) and a fluid supply passage (36) in response to the load requirements. A main control spool (96) is selectively movable between a neutral position and first and second actuated positions. A load sensing passage (78) communicates a load signal from an actuator (26) to the spring chamber (50) of the flow control valve (82). A drain passage (80) communicates the load sensing passage (78) with the reservoir (14) when the main control spool (96) is in the neutral position. A blocking mechanism (138) blocks the load sensing passage (78) when the main control spool (96) is in the neutral position and opens one of the inlet port (34) and the supply passage (36) to the spring chamber (50) so that the flow control spool (82) is held in an open position.

Abstract: A multimode push operated fluid flow selector valve is disclosed having modular construction including an individual slidable selector plate for each mode that is ported and cooperates with a common ported stator to effect the desired mode of communication.

Abstract: A flow limiting, surge damping directional control valve (11) utilizes flow regulating and surge damping means (30) for limiting the rate of flow of an operating fluid in a fluid flow path so as to absorb surge irregularities during the operation of the valve (11). The flow regulating and surge damping means (30) is carried by a movable valve member (25) adapted to control the flow and direction of flow of the operating fluid of the fluid flow path. This arrangement includes a flow regulating piston (35) having metering ports (37) for regulating the rate of flow of the operating fluid across the piston (35) and means (29) for slidably mounting the flow regulating piston on the movable valve member (25) so that the flow regulating piston (35) is positioned adjacent a selected port of the valve (11) during the operation thereof.

Abstract: A steering control system for crawler tractor type vehicles with dual power trains which is capable of separately driving left and right endless track mechanisms and comprises an interlocking valve unit and a hydraulic circuit, the interlocking valve unit being located between a manually operated section and an actuating section and adapted to operatively connect these two sections with each other, the manually operated section including left and right steering levers and a commonly used brake pedal, the actuating section including left and right steering brake units and a center clutch unit, the hydraulic circuit selectively supplying hydraulic fluid delivered by a hydraulic pump into the actuating section in response to the action of the interlocking valve unit caused by the manipulation of either of the steering levers and/or the brake pedal.

Abstract: The present invention relates to fast-fit unions for removably joining pipes, wherein a tubular lock element loaded by a spring carries on its inner wall three teeth offset axially of the union with respect to one another, the central tooth being provided opposite the other two so that, to unlock the two elements of the union, two successive inward displacement maneuvers must be exerted on the lock element, consequently allowing the compressed fluid time in which to be evacuated to the atmosphere.

Abstract: A vacuum control valve includes a body having a vacuum inlet port, a vacuum outlet port and an atmospheric inlet port formed therein, a movable diaphragm type mechanism positioned within the body to define a vacuum chamber and an atmospheric chamber within the body wherein the vacuum chamber is in communication with the vacuum outlet port and the atmospheric chamber is in communication with the atmospheric inlet port and wherein the movable mechanism is movable in response to change in vacuum pressure within the vacuum chamber, a spring mechanism normally biasing the movable mechanism in a first position, a valve mechanism movable in association with the movable mechanism to thereby control fluid communication between the vacuum inlet port and the vacuum chamber, and between the atmospheric inlet port and the vacuum chamber and a regulating mechanism which further includes a cam mechanism rotatably mounted within the body and operatively associated with the spring mechanism wherein the cam mechanism is rotate

Abstract: A closed center, load sensing hydraulic system is disclosed which contains a primary work circuit which has priority in flow demand over a secondary work circuit. The system includes a variable displacement pump fluidly connected between a reservoir and a control valve with the primary work circuit. The primary work circuit includes a control valve which regulates fluid flow from the pump to a primary hydraulic function and which includes a feedback mechanism connected thereto. The secondary work circuit also includes a manually operable control valve for regulating fluid flow from the pump to a secondary hydraulic function. A priority valve is connected between the pump and the secondary work circuit and movable between an open and a closed position to regulate the pressure of fluid discharged by the pump.

Abstract: The signal generating device provides both an electrical signal as well as a vacuum signal in response to the degree of opening of a throttle valve in a single body which has a vacuum inlet port and a vacuum outlet port as well as a atmospheric inlet port and which includes a movable diaphragm positioned within the body to define a vacuum chamber in communication with the vacuum outlet port and an atmospheric chamber in communication with the atmospheric inlet port with the movable diaphragm being responsive to the vacuum pressure within the vacuum chamber. The movable diaphragm is controlled by biasing springs and a valve member is associated with a diaphragm to control fluid communications between the vacuum inlet port and the vacuum chamber as well as fluid communication between the vacuum chamber and the atmospheric chamber.

Abstract: A pneumatic wave generator for a surf pool, comprising a caisson divided into a plurality of wave generating chambers, and a ventilator space with a source of compressed air capable of alternately effecting aspiration and expiration above the water surfaces in the wave generating chambers via a conduit system provided with air inlet and air outlet valves. According to the invention, in each of the wave generating chambers, the air inlet valve and the air outlet valve are coupled together and provided with a common drive.

Abstract: A load sensing hydraulic system is disclosed which essentially eliminates kickback from a feedback mechanism contained in a manually operable control valve which in turn is fluidly connected to a hydraulic function. The system includes a power on demand pump fluidly connected between a reservoir and the control valve for supplying pressurized fluid to the hydraulic function. A load signal line is also connected between the control valve and the pump which serves to transmit pressure signals, which are generated by loads acting on the hydraulic function, to the pump for controlling the pressurized output thereof. A load signal control valve is positioned in the load signal line and is fluidly connected to the discharge side of the pump. The load signal control valve is capable of sensing pressure variations between the fluid discharged by the pump and the upstream fluid present in the load signal line.