US 9,810,248 B2
Control fluid power apparatus and related methods
William Kenneth LeBlanc, Mansfield, OH (US); and David John Hoke, Richmond, TX (US)
Assigned to Emerson Process Management, Valve Automation, Inc., Houston, TX (US)
Filed by Emerson Process Management, Valve Automation, Inc., Houston, TX (US)
Filed on Mar. 19, 2015, as Appl. No. 14/662,672.
Prior Publication US 2016/0273561 A1, Sep. 22, 2016
Int. Cl. F16D 31/02 (2006.01); F15B 20/00 (2006.01); F15B 1/02 (2006.01); F15B 3/00 (2006.01); F15B 1/04 (2006.01); F15B 13/04 (2006.01); F15B 15/12 (2006.01)
CPC F15B 20/00 (2013.01) [F15B 1/024 (2013.01); F15B 1/025 (2013.01); F15B 1/04 (2013.01); F15B 3/00 (2013.01); F15B 13/0401 (2013.01); F15B 15/12 (2013.01); F15B 2201/00 (2013.01); F15B 2201/20 (2013.01); F15B 2211/20515 (2013.01); F15B 2211/212 (2013.01); F15B 2211/275 (2013.01); F15B 2211/865 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A control fluid power apparatus, comprising:
a first housing having a first piston defining a first chamber and a second chamber, the first chamber to receive a control fluid and the second chamber to receive a process fluid from a process system, the first chamber to be oriented above the second chamber when the control fluid power apparatus is coupled to a control valve assembly; and
a second housing having a second piston defining a third chamber and a fourth chamber, the third chamber to receive the control fluid and the second chamber is to receive the process fluid, the third chamber to be oriented above the fourth chamber when the control fluid power apparatus is coupled to the control valve assembly.