Global Patent Index - EP 2859258 B8

EP 2859258 B8 20171220 - CURVED FLAPPER SEAL WITH STEPPED INTERMEDIATE SURFACE

Title (en)

CURVED FLAPPER SEAL WITH STEPPED INTERMEDIATE SURFACE

Title (de)

GEKRÜMMTE KLAPPENDICHTUNG MIT GESTUFTER ZWISCHENFLÄCHE

Title (fr)

JOINT D'ÉTANCHÉITÉ À VOLET INCURVÉ COMPORTANT UNE SURFACE INTERMÉDIAIRE ÉPAULÉE

Publication

EP 2859258 B8 20171220 (EN)

Application

EP 13800652 A 20130605

Priority

  • US 201213490073 A 20120606
  • US 2013044205 W 20130605

Abstract (en)

[origin: WO2013184737A1] A recess is provided at the periphery of the flapper so that a corner that defines this recess engages an o-ring seal in a seat for the flapper. A reduced contact area of the flapper on the o-ring seal results in increased pressure over the actual contact area. The pressure applied over the contact area also forces a distortion in the o-ring that has a part of the o-ring not restrained due to the presence of the recess moving out of the surrounding o- ring groove so that the corner on the flapper pinches the o-ring that now is partly in and partly extending from its surrounding groove. Sealing is obtained at lower differential pressures and the o-ring is better fixated as a result of the pinch effect of the corner on the flapper.

IPC 8 full level

F16K 1/18 (2006.01); E21B 33/00 (2006.01); E21B 34/00 (2006.01); E21B 34/10 (2006.01); F16K 1/42 (2006.01); F16K 15/03 (2006.01)

CPC (source: EP US)

E21B 34/10 (2013.01 - EP US); F16K 1/42 (2013.01 - US); F16K 15/03 (2013.01 - EP US); E21B 2033/005 (2020.05 - US); E21B 2034/005 (2020.05 - US); E21B 2200/01 (2020.05 - EP); E21B 2200/05 (2020.05 - EP)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

WO 2013184737 A1 20131212; AU 2013271713 A1 20141218; AU 2013271713 B2 20160811; BR 112014030198 A2 20170627; DK 2859258 T3 20180129; EP 2859258 A1 20150415; EP 2859258 A4 20160323; EP 2859258 B1 20171115; EP 2859258 B8 20171220; US 2013327974 A1 20131212; US 9068661 B2 20150630

DOCDB simple family (application)

US 2013044205 W 20130605; AU 2013271713 A 20130605; BR 112014030198 A 20130605; DK 13800652 T 20130605; EP 13800652 A 20130605; US 201213490073 A 20120606