Abstract: Dual piston pneumatic actuators used in opening and closing gate valves are disclosed. The actuators allow for pressure to vary based on opening or closing a gate valve versus keeping the gate valve open or closed.

Abstract: A vented pressurized gas-powered actuator includes a housing having a central longitudinal axis and an inner surface. The inner surface has a constant radius between first and second planes extending perpendicular to the axis. At least one vent groove extends from the inner surface in a direction away from the axis. The at least one groove has a first end intersecting the first plane.

Abstract: A fluid-driven motor has a manifold with an arcuate seal including first and second valve openings and a sealing surface. A cylinder pivotally mounted on the manifold has a facing surface cooperating with the arcuate seal. The arcuate seal and the facing surface define a position-responsive valve configuration such that, when the cylinder assumes a neutral position, an aperture of the facing surface faces the sealing surface, and when the cylinder is angularly displaced in either direction, the aperture overlaps one or other of the valve openings, thereby connecting to the correspond fluid flow channel in the manifold. A pressure compensation volume underlies the sealing surface and receives fluid pressure from the fluid flow channels through valves, or from the internal volume of the cylinder, so that a pressure within the pressure compensation volume approaches a value no less than a current pressure within the internal volume.

Abstract: A motor capacity change-over actuator 10 varies a capacity of a hydraulic motor 1 in accordance with the inflow/outflow of a working fluid into/out of a drive pressure chamber 72. A motor capacity change-over valve 20 supplies the working fluid to the drive pressure chamber 72 in a supply position H and discharges the working fluid from the drive pressure chamber 72 in a discharge position L. A flow control valve 15 is interposed between the drive pressure chamber 72 and the motor capacity change-over valve 20, and therefore a shock generated upon deceleration of the hydraulic motor 1 can be alleviated without being affected by leakage of the working fluid in the motor capacity change-over valve 20.

Abstract: Governor valve device for a pressure fluid operated tool having a ball valve (23, 24), the valve ball (24) of which is provided in a cavity (25), open towards the seal ring (23) of the valve, in a movable piston (26). A spring-loaded member (30) urges the valve ball against the seal ring. By movement of the piston, the ball can be moved out of and into, respectively, a sealing position against the seal ring in order to permit and to prevent, respectively, the passage of pressure fluid to a drive chamber (17) in the tool.

Abstract: A working cylinder (A) having at least one working chamber (6, 7) defined by the cylinder barrel (1), at least one of the end sections (2, 3) and a piston (4), at least one supply port (9a, 9b) and a exhaust port (12a, 12b) for the working medium. The exhaust port (12a, 12b) has a valve (13a, 13b) that may be regulated by the pressure of the working medium, which is applied at the supply port (9a, 9b) in order to obtain a smaller dimension of at least the valve and to better utilize the already existing space, specifically within the cylinder, and to better and more efficiently adjust the output capacity of the individual elements. A valve (V), particularly a switch valve (W) of a rocker valve design has therefore at least one inlet (16) and at least one outlet (17a, 17b) for the working medium, as wells as at least one control port (18).

Abstract: The present invention relates generally to agricultural machinery and, more particularly, to a device for controlling a double-acting steering cylinder of a steering system, having two working connections of the steering cylinder, wherein the working connections are each connected by means of an input pipe or an output pipe to a valve unit, which comprises two switching valves that can be moved alternately into a first switching position and into a second switching position and the steering cylinder in the first switching position of the first switching valve admits a fluid at the first working connection and the steering cylinder in the second switching position of the second switching valve admits the fluid at the second working connection.

Abstract: A fluid-operated system which can supply a pressurized fluid (e.g., oil) to one or more adjustable consumers (such as a clutch and/or a transmission) in a motor vehicle. The system employs one or more fluid pressurizing pumps and/or accumulators and an arrangement of valves in a path for pressurized fluid from the pressurizing unit(s) to the consumer(s). The valves can vary the fluid pressure in dependency upon at least one variable (such variable can be selected by a control unit in conjunction with an actor). In accordance with one presently preferred embodiment, the valves can cooperate with one or more flow restrictors to impart to the fluid in the path a first pressure within a first range of varying pressures as a first function of the at least one variable, and a second pressure within a second range of varying pressures as a different second function of the at least one variable. One of the valves can be embodied in or located outside of the mobile valving element and/or housing of another valve.

Abstract: A control system (10) for a limited stall load actuator (60) comprises a servo pressure regulator (20), solenoid valve (40), relief valve (30) and a shuttle valve (50) connected with a piston actuator 60 such that when source pressure P1 is declining the servo pressure regulator (20) will open to permit more flow and maintain a minimum actuation force effected by the actuator (60), and should there occur a failure of the servo pressure regulator (20) that would permit high source pressure to be communicated to the control system (10), the relief valve (30) will operate to limit the amount of high pressure communicated to the control system (10) such that the actuator (60) will attain no greater than a predetermined maximum output force.

Abstract: The actuator for a position-adjusting device, wherein the position-adjusting device has a stationary part, a movable part, and at least one coupling element and wherein the at least one coupling element is hydraulically movable by the actuator for coupling and decoupling the stationary part and the movable part relative to one another, has a housing and at least one valve piston arranged within the housing so as to be movable between two end positions defining an open position and a closed position of the actuator. The housing has a work connector, a pressure-relieved tank connector, and a pressure-loaded tank connector. The pressure-loaded tank connector includes a pressure-limiting valve. The pressure-relieved pressure connector during displacement of the valve piston between the two end positions communicates with the work connector until a respective one of the two end positions is almost reached. In the closed position of the actuator the work connector is connected to the pressure-loaded tank connector.

Abstract: A pneumatic motor including a motor body having a piston chamber with opposed chamber ends, at least two valve chambers, an inlet for flowing a pressurized fluid into the piston chamber and each of the at least two valve chambers, a number of outlets provided in the housing for exhausting the pressurized fluid from the piston chamber and each of the at least two valve chambers. The motor also includes a three-way valve member adapted to be located in each of the at least two valve chambers, the valve members each have at least one open end and at least one port formed along the valve member body. A spool member is located in one of the valve chambers, each spool member has a first end adapted to be located in the open end of the valve member.

Abstract: A counterforce cylinder and piston exert an upward force on the vertically movable slide of a machine. The cylinder pressure line handles reverse flows during operations of the slide. A pilot-operated checkvalve (normally closed) is inserted in the cylinder line between a pressure source and the counterforce cylinder, and is held open during usual operation of the machine. An accumulator is branch-connected to the cylinder line, at a point between the checkvalve and counterforce cylinder. During machine operations, the accumulator stores pressurized fluid; at shutdown of power, the fast-acting checkvalve closes and reliably seals the cylinder line while the accumulator provides pressure to maintain the counterforce cylinder and slide in a substantially constant holding position for several days.

Abstract: A valve block in a mine hydraulic system contains a non-return valve which is opened when a hydraulic control signal occurs to connect a pressure fluid feed or return line to a working chamber of an appliance such as a prop. A auxiliary valve is mounted in the block and is operated manually to relieve the working chamber even if the non-return valve remains closed.

Abstract: A valve with four passages controls a piston (15) disposed in a cylinder (16). Between the body (1) of the valve and the cylinder (16) is disposed a plate (23) having passages (24, 25) which are used and a passage (26) which is not used in FIG. 1. By turning plate (23) 180.degree., the passage (24) is located in the non-use position, while the passage (26) connects the conduits (19 and 13) in such a way as to cause the space (21) of the cylinder (16) to communicate continuously with an exhaust orifice (6).

Abstract: A directionally controllable air cylinder has a set of circumferentially disposed air passages formed at each end of a closed tube. A sleeve manifold surrounds the tube and is pneumatically sealed thereto by means of a plurality of O-rings. The O-rings are positioned such that they selectively expose the sets of air passages to the manifold for receiving compressed air and to the atmosphere for venting. The direction of piston movement is determined by the set of passages exposed to compressed air. A pilot piston moves the manifold in response to a pilot air signal in one embodiment and an electrically operated solenoid moves it in another version. The manifold may also be manually or mechanically moved to operate the air cylinder. Hydraulic cylinders utilizing fluids, other than air, are also disclosed.

Abstract: A switch and valve assembly for inflating or deflating a pair of bladders mounted in the back and seat regions of a vehicle seat. The assembly houses two normally-closed valve assemblies and two normally-open electrical switch assemblies, with two pushbutton-actuated stems adapted to selectively either partially open the valve assemblies by partial depression of the pushbuttons to thereby bleed-off fluid under pressure from respective bladders, or to fully open the valve assemblies while closing the switch assemblies by full depression of the pushbuttons to thereby actuate the pump to provide fluid under pressure to fill the respective bladders as desired for operator riding comfort or support. Pressures in the two bladders may be changed individually or concurrently.

Abstract: A shift valve for an automatic transmission wherein governor pressure acts on a spool in such a direction as to compress a first spring, and throttle representative pressure acts on a plug in such a direction as to compress the first spring. The shift control valve further comprises a second spring arranged to act on the spool in the same direction as the direction in which the governor pressure acts on the spool.

Abstract: An apparatus for positioning an adjustable member as a function of a command signal and a control condition, especially for the positioning of a hoisting mechanism on a tractor or the like, comprises an operating circuit and a control circuit. The operating circuit has a bidirectional positionable valve with a valve side and first and second control devices for regulating flow of pressure medium from a supply tank to the adjustable member. The control circuit connects a control pressure medium source to the control devices at first and second junctions and includes adjustable throttles and a flow-regulating valve. A first adjustable throttle is connected between the supply tank and the first junction. The second adjustable throttle is connected between the control pressure medium source and the first junction and in series with the first adjustable throttle.

Abstract: A pneumatic metering pump apparatus, having a pump member, working in combination with power head means wherein a pneumatically driven piston would cooperate with the pump means. There would be further provided a fluid inlet providing fluid flow to the power head and a valving element in communication with the first fluid inlet and the piston. Further, a timer would be in fluid communication with the valve and piston, would also include a valving element housed in the valving member for providing fluid communication between the valving member and the piston when the valving member is in the first position and blocking fluid communication between the valving member and the piston and establish fluid communication between the piston and an exhaust when the valving member is in a second position.

Abstract: A spool valve for use in a hydraulic ram includes a piston journalled for axial movement within a cylinder under the influence of a fluid fed under pressure to the cylinder. The spool valve is journalled within a valve block closing an end of the cylinder through which passes a piston rod. The valve is biased from one position to another by means of differential areas of a circumferential groove around the spool and by applying fluid to a chamber at one end of the spool.

Abstract: The valve disclosed herein functions, in one sense, as a flow matching device and, in another sense, as a reciprocative check valve. By employing the valve, a hydraulic system may be implemented in which filling and emptying of a variable volume load, such as a hydraulic piston may be accomplished through a single check valve structure at controlled flow rates.

Abstract: A light weight heavy duty blind rivet setting tool having one piece upper housing containing a rivet setting mechanism and a one piece lower pressure vessel having an air activated piston operable to pressurize a medium in the upper housing to activate the rivet setting mechanism. The upper housing has a handle area containing a trigger which, through a trigger linkage, operates a valve on the bottom of the pressure vessel which is connectable to an air source. A muffler is positioned adjacent the valve to receive the exhausted air from the pressure vessel after the tool has been operated, to minimize the noise level of the tool operation. The trigger linkage is adjustable to eliminate the tolerance stack-up in the linkage.

Abstract: A free-flowing granular material storage bin of the type having an inflatable dual-walled, cup-shaped bag with a fan for inflating and deflating the bag has a single valve assembly of unique construction for controlling high volume low pressure flow for inflation and deflation cycles. The cycles are themselves automatically controlled from sensing units which sense when the bag is fully emptied and fully deflated.

Abstract: A hydraulic control device for the pressurization of a clutch or the like for a transmission operable under load comprises a spool-type valve displaceable in one direction to pressurize the clutch and in the opposite direction to vent the same. The valve spool operates with a damping piston which receives the clutch pressure buildup and acts against a control piston which, in turn, is displaced by an operative valve. According to the invention, the pressure head is maintained substantially constant by providing a sleeve or bushing within the damping piston chamber which bears against the spool by a spring and which can be biased by a spring between the damping piston and the sleeve.

Abstract: A multi-way valve for precisely controlling supplying pressure to a load device, comprising a housing and a control slide slidably mounted in the housing. The housing has annular, internal passages axially spaced along the length of the housing, with first and fifth passages located on opposite sides of second, third and fourth passages in fluid communication with a supply tank, the load device and a fluid pressure source, respectively. The control slide is slidably mounted in the passages and has parts axially spaced along the slide and axially separated by annular grooves, and an internal, longitudinal passages. First and second springs are coupled to opposite ends of the slide and bias the slide to a middle, rest position. First and second control chambers are located in the housing adjacent the slide opposite ends for applying varying pressures to the slide opposite ends.

Abstract: Multiple pins are affixed in the holes of a ceramic substrate by simultaneously impacting the pins with a piston assembly which temporarily places the pins in a viscoelastic fluid state. Upon return of the pins and the resultant fluid flow to its undisturbed solid state, each pin is left with an extension that is in interlocking engaged relationship with the ceramic particles of the substrate in the region surrounding the particular holes in which the pins have been located.The piston assembly is driven by a pneumatic high pressure system which is adjustable to the number of pins being simultaneously impacted. Release of the piston assembly is delayed until the air pressure becomes stabilized prior to impact. A vacuum pressure system returns the piston to its originating position after impact whereupon the piston assembly is ready for the next impact cycle.

Abstract: The floating control valve of a vacuum operated booster has a recess or groove and a smaller steel washer which allows the seating portion of the control valve to seek its own plane. The insert is linearly aligned with the air valve seat. The outer portion of the control valve aligned with the vacuum valve seat on the power piston is not supported by the steel insert. The groove is positioned radially between the portions of the floating control valve engaging the two seats and may be on either the front or the rear side of the floating control valve.

Abstract: A selector valve selectively communicates pressurized fluid from an inlet to an outlet and is adapted to be connected to a clutch of a transmission. The selector valve comprises a spool normally blocking communication between the inlet and outlet, a selector piston responsive to a control signal for movement towards the spool and a load piston reciprocally mounted in the selector piston and adapted to be moved thereby to control movements of the spool. A modulating orifice is interconnected between the outlet and the load piston to control movements of the spool for modulating fluid pressure in the outlet to a predetermined level.

Abstract: A two position slide valve has an inlet port connected to a source of fluid under pressure and is configured so that in one position it will load the fluid into a pressure operated device and in the other position it will evacuate the loaded fluid from the device by passing the fluid from the source through a venturi which reduces the static pressure at the outlet port of the valve.

Abstract: A blind riveter comprises a chuck, a hydraulic system for moving the chuck, and a pneumatic system comprising a cylinder, a piston, a movable piston rod attached to the piston, a longitudinally slidable valve tappet, and valve means for a supply of compressed air. The longitudinal sliding of the valve tappet operates the valve to supply compressed air into the cylinder. The movable piston rod of the pneumatic system moves in the hydraulic system under the working stroke of the piston to effect movement of the chuck. The valve tappet, the cylinder, and the piston of the pneumatic system are each sealed parallel to their respective axis and are all interspersed longitudinally.

Abstract: A hydraulic system for use in extremely cold environments has a pump for passing hydraulic fluid from a reservoir to a hydraulic cylinder of a work element via a control valve that is positioned a relatively great distance from the hydraulic cylinder. Fluid pathways are provided for substantially continuously moving hydraulic fluid between the control valve and hydraulic cylinder during operation of the pump.

Abstract: A valve for introducing air or other fluid into a fluid actuated mechanical device has an L-shaped passage through a valve stem. The valve stem is movable lengthwise between open and closed positions. In a fully open position the L-shaped passage delivers fluid from a source of fluid under pressure to a channel in a housing. In closed position the delivery end of the L-shaped passage is blocked. The valve stem also provides means for venting fluid from the channel while the L-shaped passage is blocked, when the stem is in an intermediate position.

Abstract: Two solenoid controlled ball valves are employed in such a way that dual w rate control is provided to a missile control vane actuator. The result is the superior performance of an open center valve actuator over that of a closed center valve actuator with gas consumption savings approaching that of the closed center valve design and having the same complexity as a closed center design.