Abstract:
An electro-pneumatic transducer has a plate (30, 36) mounted on an electrical coil (2) moveable through a restricted arc in a cylindrical gap in a magnet assembly (14) in response to an electrical analogue signal against a hair spring (22) bias. A nozzle (32, 38) is directed substantially perpendicularly against the plate (30, 36) such that upon rotation of the coil (2) and the plate the distance between the nozzle outlet (34, 40) and the plate is varied to produce a variation in back pressure in the air flow upstream of the nozzle outlet in direct proportion to the electrical analogue signal strength.
Abstract:
Systems and methods for a high performance transducer are disclosed. For example, one described transducer includes: a pressure locking chamber with at least one orifice; a two-state solenoid configured to be controlled by a control circuit and a capacitor, the two-state solenoid comprising a solenoid housing; and a permanent magnet assembly configured to be actuated by the two-state solenoid to move between an open and a closed position, the permanent magnet assembly comprising a stopper configured to seal the at least one orifice in the closed position.
Abstract:
A wireless position transducer for a valve in a process control system converts a motion or a position of an actuator of the valve into a wireless signal including a value indicative of the position of the actuator. The transducer causes the wireless signal to be transmitted over a wireless communication channel to a valve controller, such as by using a wireless HART protocol. The wireless communication channel is an exclusive connection between the transducer and the controller, and the transducer is powered by a local rechargeable energy storage device. The controller controls the valve based on the value included in the wireless signal. The transducer may also cause the wireless signal to be transmitted to a control host of the process control system.
Abstract:
A balance beam electro-pneumatic converter (100, 400) adapted to couple to a conduit with a fluid is provided. The balance beam electro-pneumatic converter (100, 400) includes a nozzle (184) adapted to fluidly couple to the conduit, and a flapper (130) rotatably coupled to the nozzle (184) via a pivot (140) wherein the flapper (130) is adapted to regulate a pressure of the fluid and balance about the pivot (140).
Abstract:
The invention relates to a valve having a housing (1) and at least one sealing seat (2, 3) formed therein and one piezoelectrical lamina (6) mounted at its first end so as to be self-supporting on the housing (1) and with its second end closing or opening the sealing seat (2, 3) depending on the control voltage supplied to the lamina (6). The first end of the lamina (6) is embedded in a sealing compound (7) which, in turn, is at least partially incorporated in the housing (1). The lamina (6) is thereby rigidly connected to the housing (1). While the first end of the lamina (6) is being sealed, it is fixedly held in relation to the housing (1). Consequently, the lamina (6) cannot be displaced even during a long period of operation. Subsequent adjustment is therefore unnecessary.
Abstract:
Improvement to pneumatic sensors for the control of pneumatic cycles wherein a fluid jet pump is supplied at the inlet by a compressed air circuit and is connected at the outlet to a nozzle the stopping of which causes a pressure rise in the fluid jet pump, said rise being used as a control signal of a pneumatic component. The space (4) comprised between the jets (2, 3) of the fluid jet pump is connected on one hand to an outlet orifice (14) emitting the control signal and on the other hand to an air vent valve (13b) which, open during the ejection escape, lets the atmospheric pressure into the space (4), the outlet (14) and the conduit (15) preventing the formation of a depression, and which is closed during the obturation of the escape. The invention is used for the control of pneumatic cycles.
Abstract:
A transducer for a connection to a fluid pressure source having a mechanism for setting a pneumatic output by way of an electrical input signal. The transducer provides a lower housing assembly and an upper housing assembly. The lower housing assembly comprises lower housing configured to receive a supply nozzle. The supply nozzle fluidly communicates with a supply port and intermittently fluidly communicates with an output port of the lower housing through an internal fluid passageway. The lower housing further comprises an exhaust nozzle fluidly communicating with an exhaust port and intermittently fluidly communicates with the output port of the lower housing through the internal fluid passageway. The upper housing assembly comprises an upper housing configured to receive a coil and an armature such that the upper housing, coil and armature define a latching electromagnetic circuit that provides alternating contact of the armature with the supply nozzle and the exhaust nozzle of the lower housing assembly.
Abstract:
An electric signal to pneumatic signal transducer (10) comprises a nozzle (12) that accepts an input pneumatic supply and expels a gas stream (20). A receiver (16) that is spaced from the nozzle (12) is positioned to recover at least a portion of the gas stream (20). The recovered portion constitutes a pneumatic output signal (Pout). The position of a deflector (14) relative to the gas stream (20) is controlled by an electric input signal (Iin) to aerodynamically deflect the gas stream (20) expelled from the nozzle (12). The aerodynamic deflection affects the magnitude of the portion of the gas stream (20) recovered by the receiver (16) in a manner having a known relationship to the electric input signal, thereby generating a pneumatic output signal responsive to the electric input signal.
Abstract:
The unit serves to convert an electrical control signal (I) received at the input of the unit into a pneumatic signal (P). This is emitted at the output of the unit and its value should be proportional to the value of the control signal (I). The unit comprises a tongue-shaped piezoelectric element (6) which is loaded with a voltage dependent on the control signal, so that the element (6) carries out a lateral bending movement which varies with the voltage. The unit also comprises a pneumatic line (1) with a chamber (1a) which is supplied with compressed air via a throttle (4) and from which the compressed air is conducted through a nozzle (3) located near to one side of the piezoelectric element (6) so that the air pressure in the chamber is regulated by the piezoelectric element (6) as a function of the said voltage; and an outlet line (5) leading from the chamber for transmitting the regulated air pressure to the control system as the said pneumatic signal (P). To make the pneumatic signal (P) to the control system accurately follow the electrical control signal (1), a pressure transducer (7) is connected to the outlet line (5), being designed to produce an electrical signal (T) which corresponds to the regulated air pressure, and which is fed back via a feed-back circuit to the input of the unit. Furthermore, the input has a circuit (9, 11) which receives both the electrical control signal (1) and the fed-back electrical signal (T). The circuit has a device (9) for forming a difference signal by comparing the two signals (I, T) and a device (11) for integrating the difference signal and thereafter producing from the integrated difference signal the voltage with which the piezoelectric element (6) is loaded.