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:
Dec. 20, 2016
Filed:
Jul. 18, 2013
Applicant:
Abb Schweiz Ag, Baden, CH;
Inventors:
Assignee:
ABB Schweiz AG, Baden, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16K 31/02 (2006.01); F15B 13/043 (2006.01); F15B 20/00 (2006.01);
U.S. Cl.
CPC ...
F15B 13/0433 (2013.01); F15B 13/0438 (2013.01); F15B 20/002 (2013.01); F15B 13/0431 (2013.01); F15B 2211/30575 (2013.01); F15B 2211/328 (2013.01); F15B 2211/355 (2013.01); F15B 2211/527 (2013.01); F15B 2211/6336 (2013.01); F15B 2211/6355 (2013.01); F15B 2211/8623 (2013.01);
Abstract
An on-off pilot stage valve arrangement for controlling at least one main stage valve. The on-off pilot stage valve arrangement includes a first pilot valve discretely operable between two states, an on and an off state, the first pilot valve having an input at which there is a first pressure and an output connected to the main stage valve, a second pilot valve discretely operable between two states, an on and an off state, the second pilot stage valve having an input at which there is a second pressure and an output connected to the main stage valve. Both the valves are configured to be set in one of the two states in case the arrangement loses power.