Title:
CONTROL VALVE HAVING LIVE LOADED PACKING FOLLOWER WITH LEAK-OFF AND INDEPENDENT SECONDARY SEAL
Document Type and Number:
WIPO Patent Application WO/2011/075248
Kind Code:
A8
Abstract:
A control valve includes a valve body 112, a valve stem, and a control element. The valve body receives the stem and includes a packing 128 box housing a packing set 130. A packing follower 132 includes a bore 133 sized to receive the stem and includes an upper portion 136, a lower portion 138, and a bearing surface 140, the lower portion sized to extend into the valve bonnet to engage the packing set to apply a first compressive force to the packing set, the upper portion including threads 144 and having an upper counterbore 146 housing a secondary seal ring 166. A nut 148 operatively engages the threads of the upper portion of the packing follower, the nut positioned to apply a second compressive force to the secondary seal ring, and a spring 170 is positioned between the packing flange 160 and the bearing surface 140 of the packing follower, wherein the first compressive force is independent of the second compressive force.
Inventors:
BRESTEL RONALD R (US)
Application Number:
PCT/US2010/056408
Publication Date:
September 27, 2012
Filing Date:
November 11, 2010
Export Citation:
Assignee:
FISHER CONTROLS INT (US)
BRESTEL RONALD R (US)
BRESTEL RONALD R (US)
International Classes:
F16K41/02
Attorney, Agent or Firm:
READ, David, C. (Gerstein & Borun LLP233 S. Wacker Drive,6300 Willis Towe, Chicago IL, US)
Download PDF: