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An electropneumatic transducer which operates quickly and accurately over a broad range of pressures to control high pressure, high flow devices at their point of operation. The transducer is lightweight and insensitive to position or vibration, and can be readily mounted to the device to be control

An electropneumatic transducer which operates quickly and accurately over a broad range of pressures to control high pressure, high flow devices at their point of operation. The transducer is lightweight and insensitive to position or vibration, and can be readily mounted to the device to be controlled at its workpoint and operated remotely by a process controller or other electrical device. There is also provided both internal and external feedback whereby the repeated accurate operation of the transducer is assured.

대표청구항 ▼

A device for the remote control of a pneumatically operated mechanism, the mechanism having a pneumatic input port, said mechanism operating in response to the pressure applied to its pneumatic input port; said device comprising: (a) input/output means for defining an output control pressure port, a

A device for the remote control of a pneumatically operated mechanism, the mechanism having a pneumatic input port, said mechanism operating in response to the pressure applied to its pneumatic input port; said device comprising: (a) input/output means for defining an output control pressure port, an input supply pressure port, an output vent port, and an electrical connection port, said output control pressure port being configured to interlock in fluid communication with the pneumatic input port of said mechanism, said electrical connection port including a supply voltage connection and a signal voltage connection; (b) a transducer, said transducer having a pneumatic input pressure sensor in fluid communication with said output control pressure port, said transducer including means for receiving a supply voltage from said supply voltage connection, said transducer further including means for generating an electrical signal output in proportion to the pressure sensed by said sensor; (c) a pressure supply valve, said pressure supply valve having a first port in fluid communication with said input supply pressure port and a second port in fluid communication with said output control pressure port; (d) a pressure vent valve, said pressure vent valve having a first port in fluid communication with output control pressure port and a second port in fluid communication with said output vent port; (e) said pressure supply valve and said pressure vent valve being characterized by three static states; an open state in which said valves are fully open, a closed state in which said valves are fully closed, and a seeping state in which said valves seep; (f) control circuitry, said control circuitry including means for receiving a supply voltage from said supply voltage connection, means for receiving a signal voltage from said signal voltage connection and means for receiving the electrical signal output from said transducer, said control circuitry further including means for comparing said signal voltage from said signal voltage connection with said electrical signal output from said transducer and means for generating a control output signal corresponding to the compared difference; (g) said pressure supply valve being responsive to said control output signal by opening when said control output signal indicates said signal voltage to be greater than said electrical signal output by more than a specified difference, and by closing when said control output signal indicates said signal voltage to be less than said electrical signal output by more than said specified difference; (h) said pressure vent valve being responsive to said control output signal by closing when said control output signal indicates said signal voltage to be greater than said electrical signal output by more than specified difference, and by opening when said control output signal indicates said signal voltage to be less than said electrical signal output by more than specified difference; (i) said pressure supply valve being responsive to said control output signal by seeping when said control output signal indicates said voltage to be greater than said electrical signal output by less than said specified difference, and by closing when said control output signal indicates said signal voltage to be less than said electrical signal output by less than said specified difference; and (j) said pressure vent valve being responsive to said control signal by closing when said control output signal indicates said signal voltage to be greater than said electrical signal output by less than a specified difference, and by seeping when said control output signal indicates said signal voltage to be less than said electrical signal output by less than a specified difference.