Low Consumption Pneumatic Controller
OwnerGeorge W. Gassman, Alexander C. Pesekinventors
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Abstract
A pneumatic controller for controlling a process advantageously reduces fluid consumption by providing a proportional adjustment to a feedback signal. The pneumatic controller comprises a pneumatic control stage, a process pressure detector, and a feedback proportioning device. The feedback proportioning device uses a feedback cantilever component to provide the proportional adjustment of the feedback signal, thereby reducing the fluid consumption of the pneumatic controller.
Claims20
A pneumatic controller for controlling a process comprising:
- a pneumatic control stage providing a process control signal to a control element;
- a pneumatic feedback assembly providing a feedback control signal representative of the process to the pneumatic control stage, wherein the feedback control signal modifies the process control signal;
- and
- a cantilever feedback assembly connected to the pneumatic feedback assembly wherein the cantilever feedback assembly provides an adjustment to the feedback control signal.
A feedback proportioning device for a pneumatic process controller having a pneumatic control stage and a pneumatic feedback assembly, the feedback proportioning device comprising:
- a feedback detector providing a feedback signal representative of a control signal produced by the pneumatic control stage;
- and
- a cantilever assembly providing a predetermined adjustment of the feedback signal.
The feedback proportioning device of claim 16, wherein the length of the cantilever is determined by a position of the adjuster.
Dependencies are inferred from the claim text.