Abstract: A volume booster for a fluid flow control device comprises a supply path for supplying a fluid boost to facilitate actuation of an actuator in a first direction, and an exhaust path for enabling controlled exhaust to facilitate actuation of the actuator in a second direction. The supply path defines a supply resistance that is set by the geometry of a supply trim component. The exhaust path includes an exhaust resistance that is set by the geometry of an exhaust trim component. The supply and exhaust trim components are independently removable and replaceable with replacement components to customize the exhaust and supply resistances, and therefore, the exhaust and supply capacities for specific applications.

Abstract: Vitrectomy probes and system related thereto are disclosed herein. The disclosure describes various example vitrectomy probes having an adjustable cutting port size. Various example features are described for adjusting the size of the cutting port. Further, the disclosure provides examples for adjusting the size of the cutter port while the vitrectomy probe is in operation.

Abstract: A fluid flow control device includes a trim cartridge, a diaphragm assembly, and a control element. The trim cartridge defines a cartridge supply port and an upper planar surface. The cartridge supply port is disposed along a supply path of the volume booster and the upper planar surface is disposed along an exhaust of the volume booster. The diaphragm assembly defines an exhaust port on the exhaust path. The control element is movably disposed in the trim cartridge and includes a supply plug, an exhaust plug, and a stem. The supply plug engages the cartridge supply port and the exhaust plug engages the exhaust port. The exhaust plug further includes a lower planar surface that is coplanar with the upper planar surface of the trim cartridge.

Abstract: A fluid flow control device having a body having a inlet connection, an outlet connection, a discharge port and a booster module disposed within the body. The booster module including a control element and an actuator element having a noise-reducing trim element with a supply path extending between the inlet connection and the outlet connection and an exhaust path extending between the outlet connection and the discharge port. The noise-reducing trim element being coupled immediately adjacent to the discharge port such that the noise-reducing trim element distributes a fluid flow to the discharge port via the exhaust path into a plurality of fluid jets to substantially inhibit jet recombination at the discharge port.

Abstract: A fluid flow control device includes a body having an inlet connection, an outlet connection, and a discharge port. A supply path extends between the inlet connection and the outlet connection and a booster module is disposed within the body. The booster module includes a control element and an actuator element and defines an exhaust path extending between the outlet connection and the discharge port. A supply port is disposed within the booster module along the supply path between the inlet connection and the outlet connection and at least a first damping means operatively connected to the booster module.

Abstract: A door operator includes a housing, a first pressure compartment; a second pressure compartment, a drive unit disposed in the housing and coupleable to a door via an output shaft, the driving unit being associated with the first pressure compartment, a hydraulic pump in hydraulic connection with the first and second pressure compartments, a motor in driving relationship with the hydraulic pump, and a spring force accumulator disposed in the housing. The spring force accumulator is associated with the second pressure compartment and coupled to the drive unit.

Abstract: An asymmetric volume booster assembly includes an actuator movable in a first direction and a second direction, a first booster in fluid communication with the actuator, and a second booster in fluid communication with the actuator. The first booster includes a first supply passage and a first exhaust passage, wherein the first supply passage supplies fluid to the actuator and the first exhaust passage exhausts fluid from the actuator. The first exhaust passage is configured to produce a first fluid flow resistance. The second booster includes a second supply passage and a second exhaust passage, wherein the second supply passage supplies fluid to the actuator and the second exhaust passage exhausts fluid from the actuator. The second exhaust passage is configured to produce a second resistance to fluid flow. The first fluid flow resistance is greater than the second fluid flow resistance, such that the actuator moves substantially symmetrically in the first direction and the second direction.

Abstract: A back-pressure valve comprises a case having first and second oil chambers through which oil passes. A piston is slidably accommodated within the case to partition the first oil chamber and the second oil chamber. A spring urges the piston in a sliding direction. A projecting member and a check valve allow the first oil chamber to communicate with the second oil chamber when the pressure of the oil in the first fluid chamber reaches a predetermined pressure. An area of the piston on which oil pressure is received in the first oil chamber is made lager than an area on which oil pressure is received in the second oil chamber. A part of the piston located at an end thereof opposite to the end thereof which faces the first oil chamber communicates with the outside of the case.

Abstract: An asymmetric volume booster assembly includes an actuator movable in a first direction and a second direction, a first booster in fluid communication with the actuator, and a second booster in fluid communication with the actuator. The first booster includes a first supply passage and a first exhaust passage, wherein the first supply passage supplies fluid to the actuator and the first exhaust passage exhausts fluid from the actuator. The first exhaust passage is configured to produce a first fluid flow resistance. The second booster includes a second supply passage and a second exhaust passage, wherein the second supply passage supplies fluid to the actuator and the second exhaust passage exhausts fluid from the actuator. The second exhaust passage is configured to produce a second resistance to fluid flow. The first fluid flow resistance is greater than the second fluid flow resistance, such that the actuator moves substantially symmetrically in the first direction and the second direction.

Abstract: The present invention provides an actuator using a fluid cylinder capable of imparting stiffness to a fluid cylinder such as an air cylinder with a simple constitution, a control method thereof and a choke valve device. The actuator is provided with a fluid cylinder 1, a first choke valve device 3 and a second choke valve device 5. The fluid cylinder 1 has a cylinder chamber 7 and a piston 12 dispose slidably in the cylinder chamber 7 so as to partition the cylinder chamber 7 into a first chamber 9 and a second chamber 11. The first choke valve device 3 is disposed between a fluid pressure source and the first chamber 9; and the second choke valve device 5 is disposed between the fluid pressure source and the second chamber 11. Each of the choke valve devices 3 and 5 is provided with a discharge valve mechanism capable of changing the opening of the valve.

Abstract: An actuator includes a piston within a cylinder, the cylinder having a first fluid port in communication with an open side of the piston, and a second fluid port in communication with a shaft side of the piston. The piston travels in a first direction, toward the shaft side of the piston and in a second direction, toward the open side of the piston. The actuator includes a valve circuit configured to selectively couple the first fluid port with a high-pressure fluid source when piston travel in the first direction is desired, and with a low-pressure fluid source when piston travel in the second direction is desired. The valve circuit is further configured to couple the second fluid port to the high-pressure fluid source when piston travel is desired in the first or second direction, and to close the first and second fluid ports when no piston travel is desired.

Abstract: A controlled piston (20, 62, 102) having a first end (24, 64, 104) mounted in a controlled piston sleeve (22) and a spool (16) movably mounted in a spool sleeve (18), a first fluid passage (40, 66, 108) from the spool (16) to the controlled piston first end (24, 64, 104), the position of the spool (16) affecting a position of the controlled piston (20, 62, 102), an FFV (42, 68, 110) in an FFV sleeve (44, 70, 112) in the first fluid passage (40, 66, 108) having a first end section (46, 74, 116), a second end section (48, 78, 120) and a central section (50, 82, 126) having a third diameter less than the diameters of the first and second sections, the FFV (42, 68, 110) being shiftable between a first position blocking the first fluid passage (40, 66, 108) and a second position allowing fluid flow past the central section (50, 82, 126) to the controlled piston (20, 62, 102), and a second fluid passage (56, 88, 134) from the spool (16) to the FFV first end section (46, 74, 116).

Abstract: A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently controlled valves controlling the flow of fluid into and out of the other end of the actuator. Regeneration of the fluid flow from one end of the actuator to the other end of the actuator is provided by blocking the exhaust flow of fluid to the reservoir by one of the independently controlled valves and redirecting the flow across the other of the independently controlled valves to join with the flow of the pump that is being directed to the other end of the actuator. This arrangement permits a portion or all of the fluid from one end of the actuator to be regenerated to the other end of the actuator.

Abstract: A hydraulic control circuit for controlling the operation of an attachment or tool associated with a particular work machine wherein such circuit includes an actuator for controlling the operation of the attachment or tool, a control valve operable to control fluid flow to the actuator, a fluid path communicating the control valve with the actuator, and a pilot signal control device positioned in communication with both the control valve and a pilot pressure source and having a signal port in communication with the actuator for sensing the pressure associated therewith, the control device being responsive to the pressure associated with the actuator and being operable for sending a control signal to the control valve when a pressure condition in the actuator reaches a predetermined value, the control signal actuating the control valve so as to at least partially close such valve and maintain an operative pressure on the attachment actuator while, at the same time, decreasing the fluid flow through the control

Abstract: A weld gun cylinder and piston assembly includes a common center end wall interposed between two cylinders. The common center end wall functions as a manifold with bores extending therethrough. The manifold houses two spool valves. The spool valves control the passage of pneumatic pressure through passages of the manifold to and from the cylinders to extend and retract two piston rods for controlling jaws and a weld tip on a robotic arm.

Abstract: An automatic depth control system is disclosed. The system includes a Console and remote Controller mounted in the tractor cab, power beyond Valving, and Depth Sensors, either ground contact or non-ground contact, mounted on the frame of the implement. The depth sensing system is provided to sense the actual penetration of an implement tool by determining the height of the implement frame above the ground. A circuit system is provided to receive the depth signal and to signal power beyond valving that will effect hydraulic corrections in order to maintain the select depth penetration. The Console includes an instrument panel having a toggle switch with AUTO, LOCK and MANUAL positions, an LED showing depth of tool penetration and a bargraph depicting variations from a desired depth and flashing lights on the bargraph to show depth corrections in process. The Console also includes a depth window in which no hydraulic correction would be made, a sensitivity switch, depth sensor switches and an UP/REPHASE switch.

Abstract: A fluid flow control for controlling the speed of a piston in a fluid power cylinder is disclosed in which the flow control is located within the confines of the cylinder and includes a rotatable disk having tearshaped slots for communication of the exhaust fluid through the disk and out of the cylinder through discharge ports. Rotation of the disk to selectively position greater or lesser width portions of the tearshaped slot relative to an exhaust discharge opening in the cylinder permits selective, variable adjustment and throttling of the exhaust fluid to control the speed of movement of the piston in the cylinder.

Abstract: A two stage valve assembly responsive to signals from a control system for supplying pressurized fluid to two load lines. The first stage includes a motor that directs pressurized fluid from a jet pipe toward a receiver assembly having two receiver ports and a bleedoff area disposed between and separating the receiver ports. The second stage assembly includes two spool/sleeve assemblies that control the flow of pressurized fluid to and from the two load lines. A drain line from the receiver assembly includes a pressure relief valve, which insures that both spool/sleeve assemblies will be servo-controlled at all times. Cartridges may be inserted in the spool/sleeve assemblies to linearize the relationship between input current from the control system and the output force of an unequal area actuator connected to the load lines.

Abstract: A hydraulic system incorporating a double acting piston and cylinder and a bi-directional pump/motor derives energy from a drive system when operating in the pump mode and delivers energy to the drive system when in the pump mode and includes a circulation valve for supplementing fluid flow to and from and fluid supply in accordance with the unequal demands of the chambers driving the hydraulic actuator in one direction or the other by circulating fluid between the chambers.

Abstract: In the case of a hydraulic control device for an oscillating load moving system comprising a double-acting hydroconsumer (V), which is adapted to be selectively connected to a pressure source (P) or to a reservoir (T) via two separate main lines (9, 10) and a control valve (C), and further comprising a load supporting valve (H), which is arranged in at least one main line (10) between the control valve (C) and the hydroconsumer (V) and which is adapted to be opened from the other main line (9) via a pilot line (16), a damping device (X), which consists of a bypass line (23) and an interference throttle aperture (D2), is connected to the pilot line (16) of the load supporting valve (H). The pilot line (16) has provided therein a throttle aperture (D1) which is smaller than the interference throttle aperture (D2).

Abstract: A flow control valve has a first variable restrictor to control a flow rate of a hydraulic fluid supplied from a hydraulic fluid supply line to a hydraulic actuator and a second variable restrictor to control a flow rate of the hydraulic fluid discharged from the hydraulic actuator to a hydraulic fluid return line. A pressure compensating valve holds constant a differential pressure across the first variable restrictor, and a recovery circuit having a recovery line has a check valve that allows flow of the hydraulic fluid only toward the supply line. The recovery circuit receives at least part of the hydraulic fluid discharged from the hydraulic actuator and returns it to the supply line at a portion between the pressure compensating valve and the first variable restrictor through the recovery line upon controlling of the discharged flow rate by the second variable restrictor to thereby recover the discharged hydraulic fluid.

Abstract: Hydraulic control of reversible hydraulic motors typically requires several different valves to provide for the various operating parameters. The subject hydraulic control circuit has only a pair of electrohydraulic control valves to provide all the typical operating parameters. Operation of the control valves is controlled by a microprocessor in response to receiving command signals from a manually controlled command signal outputting device which establishes a desired fluid flow rate and direction of flow through the control valves.

Abstract: The invention discloses a controlled connector-adjuster permitting two different speeds in the same stroke of a double-acting pneumatic pressure cylinder.In the absence of a control signal at the orifice (13) of the apparatus, the escape pressure from the cylinder (30) effecting its rod extension stroke, finds the return valve (14) closed and holds the piston (2) against the stop (9) whose adjustment defines a first flowrate between the needle valve (15) at the end of the piston and its seat (16), which flowrate corresponds to the high speed. The arrival of a pressure signal into the chamber (6) causes piston (2) to move until it abuts on a second screw (7) whose adjustment permits a second smaller flowrate than the first one and which thus determines the second speed.

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: The drive is controlled such that reduced pressure is applied during a forward motion phase and venting flow from the drive is used as dynamic control pressure to hold off application of full driving pressure until, through physical impediment, piston movement stops. This way rebounding is prevented and strong holding pressure (e.g. on welding electrodes) is made available after a low power motion phase.

Abstract: A fluid pressure-intensifying system of the double-acting type has a recompression valve assembly that meters working fluid of the low pressure hydraulic cylinder to control low pressure piston travel upon reversal at the end of each pressure-intensifying stroke.

Abstract: A pilot hydraulic system comprises a directional control valve having at least one pilot chamber for controlling the operation of a hydraulic actuator; and a pilot valve connected through a pilot line to the pilot chamber of the directional control valve for operation thereof. The pilot line includes a flow control valve which allows a free flow of hydraulic fluid from the pilot valve to the directional control valve while limiting a flow of hydraulic fluid from the directional control valve to the pilot valve.

Abstract: A base means (12) for directing fluid from a pneumatic control assembly to a number of pneumatic cylinders wherein the base means (12) is remotely mounted from the pneumatic cylinder and the pneumatic control assembly is mounted to the base means (12) and is in fluid communication with the base means (12) through base ports (38,40) which extend completely through the base means (12). The base means includes an upper and lower support surface (28,30), as well as side walls (31,32) and end walls (33,34) extending therebetween, and also includes communication ports (35,36) disposed on the faces of the walls. Flow passeges provide (44,46) fluid communication between the base ports (38,40) and the communication ports (35,36) and delivery means (48) extend between the communication ports (35,36) and cylinder ports located on either side of the piston in a pneumatic cylinder.

Abstract: A flow regulating device is placed between a compressed air distributor and a double-acting jack for regulating the admission and exhaust flow of compressed air. The device includes a body with a cylindrical housing in which is mounted for axial sliding a movable member, and within which are two passageways transversed perpendicular to the body. Each passageway issues into a chamber defined by a bottom, the housing and the movable member. The two chambers are isolated by the movable member which comprises a central seal. The opening of the passageways are defined by stop members placed at both ends of the housing.

Abstract: Automatic device for economizing compressed air comprises a means for ensuring the passage of driving fluid under pressure during most of the stroke of the moving element of a user apparatus. The device consists of a single-unit body having a first circuit connecting a fluid supply pipe to one chamber of the cylinder actuator. The first circuit is controlled by a valve moving with a piston subjected to the action of an elastic means and slidably mounted in the body. The piston is actuated by the presence or absence of a pressure signal, the body having a second circuit by-passing the first circuit and connecting a fluid exhaust pipe to the cylinder chamber.

Abstract: A pneumatic control assembly for a pneumatic cylinder having cylinder ports at the opposite ends thereof wherein the control assembly includes a valve body clamped directly to the pneumatic cylinder by a stud extending completely through the valve body and threadedly engaging the bore in the cylinder to provide the only means for maintaining the valve body attached to the pneumatic cylinder. An identical stud extends through an adapter to engage the other port in the cylinder and a pilot body is connected to the valve body by screws and includes electrically actuated solenoids for conducting pilot pressure to the valve body for allowing the full pressure to enter and exhaust from the respective ports in the cylinder to move the piston therein back and forth.

Abstract: Electrohydraulic regulating device, particularly for aircraft controls, iuding a regulating cylinder having a regulating piston therein capable of being loaded at either end thereof for the positioning of which necessary volumes of operating fluid can be supplied separately to either end space of the cylinder by means of magnetically-operable valves; a computer by which switch pulses of variable duration to be fed to the magnetically-operable valves are determined in dependence on the specified adjustment distance of the regulating piston; restrictors which determine the throughput of operating fluid through the magnetically-operable valves and sensors which after the switching of a respective magnetically-operable valve generate electrical signals which are fed back to the computer purely as a confirmation of operation. The restrictors are so arranged in an operating fluid circuit that, on movement of the piston, operating fluid flows through only one of the restrictors.

Abstract: A cylinder driving apparatus, wherein a head chamber and a rod chamber of a cylinder for driving a load upwardly and downwardly are communicated with a pressure accumulation tank by way of a balance pipeway equipped with an electromagnetic proportional flow control valve and a recycling pipeway equipped with a pressure control valve mechanism, respectively, and the load is driven by feeding air at reduced pressure to the rod chamber or discharging it to the external atmosphere by way of the pressure control valve mechanism while applying air pressure into the head chamber of the cylinder against the load by way of the electromagnetic proportional flow control valve for adjusting the driving speed.

Abstract: A load control system is disclosed for preventing the uncontrolled lowering of a load should a line failure occur in a hydraulic system. The system is designed to be used with a hydraulic cylinder having a movable piston therein which divides the cylinder into a head end and a rod end. Attached to the piston and extending out of the hydraulic cylinder is a piston rod which has a load secured to its free end. The load control system includes a source of pressurized fluid, the flow of which is selectively controlled to the hydraulic cylinder by a control valve. Positioned between the control valve and the head and rod ends of the hydraulic cylinder, respectively, are first and second valves each of which is normally biased towards a closed position by a common pressure. The first and second valves are urged toward an open position by fluid pressure taken between the control valve and the first valve and are movable by this fluid pressure in a proportional manner with the second valve being opened first.

Abstract: The invention relates to a steering assembly having a bidirectional servomotor of the differential piston type which is connectable to steerable wheels. A directional control valve unit has a spool valve with two collars which cooperates with the housing to form first and second end control chambers and a middle chamber. A power circuit supplies pressurized fluid equally to the end control chambers and a manually operable control pump is operable to selectively and incrementally increase and decrease the pressures in the end chambers in a push-pull mode to effect movement of the servomotor piston in either direction. The control valve has two ports connected to opposite ends of the servomotor with one port providing fixed and constant fluid communication between the first valve chamber and one side of the servomotor.

Abstract: This relates to a pneumatic feed system for moving a labeler head of a labeling apparatus for depositing labels in mold halves of a blow molding apparatus. The relatively heavy labeler head must be rapidly accelerated and then rapidly decelerated and at the same time moved sufficiently so as to provide for a large number of back and forth cycles per minute. There is provided in association with compressible shock absorbers a pneumatic system including a high pressure supply and a low pressure supply together with throttle valves such that the gas in the unpressurized end of the cylinder is rapidly compressed near the end of the stroke to function as a shock absorber and further, the cylinder is of a much larger diameter than that required for moving the labeler head so as to permit for the rapid acceleration as well as the rapid deceleration.

Abstract: An improved control valve for double-acting piston and cylinder asemblies is disclosed in which pressure for actuating a regeneration valve to direct hydraulic fluid from the contracting side of the piston to the expanding side, is controlled by a cylindrical check valve apparatus (86-112) which surrounds the valve plunger and controls the pressure of fluid flowing from the contracting side to the reservoir.

Abstract: An hydraulic system: a power assisted vehicle steering system which includes such an hydraulic system and a method of alleviating noise in an hydraulic system. The hydraulic system as applied to a vehicle steering gear (1) has an open center valve (3) which directs hydraulic fluid under pressure derived from a pump (12) and in response to a steering maneuver through a shaft (4) to a servo motor of the gear (1). Downstream of the open center valve (3) is a restrictor (8) through which hydraulic fluid from the valve (3) passes to a reservoir (11). The restriction effected by the restrictor (8) to fluid flow from the valve (3) to the reservoir is variable to provide a throttling action and a back pressure in the line (6) to alleviate noise in the valve (3).

Abstract: A gate valve having a top inlet and bottom outlet is provided with a horizontally disposed head slidable between closed and open positions. The valve body includes a seat concentric with an inlet passage and adapted to cooperate with a sealing surface on the head. An annular sleeve is provided within the inlet passage with one end of the sleeve being in contact with the sealing surface on the head. The sleeve and seat cooperate with the valve body and head to define an annular space. A means is provided to pressurize the space immediately prior to contact between the head and the seat. The head is biased to a closed position in the event of power failure. The valve is particularly designed for controlling downward flow of high temperature particulate material under high pressure.

Abstract: A power assisted vehicle steering system has a pressure biased piston and cylinder (1) actuation of which effects in the power assistance. The piston (2) has axially opposed faces (5, 7) with different effective pressurized areas of which the face (5) with the smaller area communicates with a first chamber (6) and the face (7) with the larger effective area communicates with a second chamber (8). A valve (10) which is axially adjustable (but may be rotary) in response to a steering manoeuvre controls flow of pressure fluid from the pump (9) to the piston and cylinder (1) for providing power assistance.

Abstract: The direction control valve comprises a housing having a stepped central boring for accommodating a sliding control piston having a section of larger diameter and a section of smaller diameter. The housing defines two load ports each communicating with an assigned boring section through an annular gap. One load port is directly connectable through its annular gap with a pressure releasing or venting port and the other load port is connectable to the same venting port through a central passage in the piston.

Abstract: A machine adapted for travel along a pair of railway rails supported by concrete crossties and arranged to be attached thereto by a pair of clips disposed inside and outside of each rail together with a bolt passing through each clip into threadable engagement within the crosstie. An engine on the machine powers a pressurized fluid system which, according to control signals from an operator on the machine, moves the machine along the rails and according to other control signals moves work heads so as to position fluid driven sockets in engagement with the heads of the four bolts to be inserted into or removed from a crosstie. Devices on the machine then are operated to simultaneous screw or unscrew the bolts into or from the crosstie and during this operation each bolt is torqued to a specified limit.

Abstract: The self-actuating fluid holding system includes a fluid pump and two fluid valves and two fluid motors all fluid-flow connected together. The valves are arranged to sense the proportionate flow therethrough and to the two motors, and when the flow is out of proportion, such as when one of the connecting lines or a connection breaks to permit the fluid to leak, then the valves have shut off closures which protect the system against fluid leakage.

Abstract: A hydraulic control system for use with double-acting shifting rams in a mine working.The system has a pump for supplying pressure fluid and main and return feed lines or conduits connected to the pump and laid along the working. An adjustable pressure-regulating device or devices serves to provide fluid at variable pressure in a further feed line or conduit.Each ram has its working chambers connected to a control device which is in turn connected to the main and further feed lines or conduits and to the return line or conduit. The devices can each be set to various positions to operate the rams in order to extend one of the rams its associated device is set to connect the working chamber used for extension (having the larger piston working surface area) to the further feed line or conduit, and to connect the other working chamber used for retraction (having the smaller piston working surface area) to the to the main feed line or conduit.

Abstract: A closed center control valve for double acting motors having an inlet passage and a pair of control passages is provided with pre-sized restrictions in the control passages to control the flow rate to the motor so that a pre-selected velocity of movement of the motor is achieved.

Abstract: A flow control valve comprises a body having a longitudinal bore therethrough at one end terminating in a first port and intermediate its ends a second port which communicates with said bore and is adapted for a connection to a cylinder port. The body has an apertured valve seat intermediate said ports and communicating with said first port. A valve element is adapted for registry with and for adjustment away from said seat. An apertured cap is threaded into the other end of the body and receives a manually adjustable valve control pin threaded thereinto and nested and sealed within said cap for relative longitudinal movements therein. A valve pin retainingly engages the valve element and at one end is secured to the valve control pin. A spring is interposed in compression between said valve element and valve control pin normally biasing said valve element towards said seat.

Abstract: The invention specifically relates to an improved rotary actuator for operating a reciprocating member used for transferring articles from one position to another. The rotary actuator is air driven, and linkage is provided between the actuator and the reciprocating member for uniformly accelerating and decelerating the member between two positions. Cushioning of the actuator also improves the acceleration and deceleration characteristics of the actuator.

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.