Abstract:
A hydrofluidic oscillator including a momentum exchange fluidic amplifier (10) coupled to a four-way reciprocal valve (12). The four-way valve is connected to control flow of hydraulic fluid from a source (42) thereof to a using apparatus (C1, C2). The fluidic amplifier is connected to provide input signals (90, 80) to the four-way valve to cause the four-way to reciprocate responsive to the input signals. Both negative (84, 94) and positive (88, 98) feedback paths are provided from each outlet (16, 18) of the fluidic amplifier to the respective control ports (20, 22) to control oscillation of the four-way valve.
Abstract:
A jet reflector servovalve includes a flexure tube and reflector that opposes a fluid nozzle and fluid receivers of the servovalve. During operation, the nozzle directs a pressurized fluid jet toward the reflector. The pressurized fluid travels within a second stage of the servovalve, toward the reflector. The reflector directs or reflects the fluid back toward the fluid receivers to adjust a position of a spool of the servovalve. The configuration of the reflector, the nozzle, and the receivers allows transmission of the pressurized fluid within the second stage of the servovalve and minimizes the necessity for multiple o-rings between the second stage of the servovalve and a torque motor of the servovalve, thereby reducing manufacturing costs of the servovalve.
Abstract:
A solenoid valve for use in controlling the flow of pneumatic fluid under pressure between a pair of flow ports defined by a housing. The flow of fluid is controlled by a spool disposed within a bore and is movable between first and second positions. When in one of said first and second positions, the spool blocks communication between the ports and when in the other of said positions it allows communication between the flow ports. The spool is reciprocated by a motor means which includes a core of magnetic material connected to the spool so that when the motor is energized, the spool is placed in one of its first and second positions and when the motor is de-energized, a spring moves the spool to the other of its positions.
Abstract:
A servovalve assembly includes a motor having a flapper shaft (112). A flapper (114) couples to a first end of the flapper shaft such that the flapper shaft orients the flapper between a first nozzle (118) and a second nozzle (120) of the servovalve assembly. An adjustment assembly adjusts a position of the flapper relative to the nozzles of the servovalve. The adjustment assembly enables a servovalve manufacturer to set the flapper of the servovalve at a null position without disassembling the servovalve. Rather, the manufacturer is capable of simply installing the adjustment assembly and deforming an arm portion of the adjustment assembly for proper null position calibration.