The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2014
Filed:
May. 03, 2011
Mike Santinanavat, Chesterfield, MO (US);
Mark H. Stark, St. Louis, MO (US);
Shweta Annapurani Panimadai Ramaswamy, Maryland Heights, MO (US);
John Broker, Warrenton, MO (US);
Mike Santinanavat, Chesterfield, MO (US);
Mark H. Stark, St. Louis, MO (US);
Shweta Annapurani Panimadai Ramaswamy, Maryland Heights, MO (US);
John Broker, Warrenton, MO (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A valve unit for adjusting gas flow to a two-stage combustion apparatus includes a valve member that is moved by a magnetic field generated by a coil to vary gas flow rate through the valve unit, and first and second connectors configured to receive a high-stage activation signal and a low-stage activation signal, respectively. The valve unit includes a valve controller that is configured to control the coil to establish a high-stage gas flow rate while the high-stage activation signal is present, and configured to control the coil to establish a low-stage gas flow rate while the low stage activation signal is present up to a predetermined low stage time limit. The valve controller is further configured to establish at least one gas flow rate between the low-stage and high-stage gas flow rates when the low stage activation signal is present beyond the predetermined low stage time limit.