SEAL STRUCTURE FOR BUTTERFLY VALVE

WIPO Patent Application WO/2015/147197

A1

Provided is a seal structure for a butterfly valve with which sealing characteristics near a valve vane are improved and an increase in operating torque is prevented by suppressing a force that deforms a resin lining layer during operation when the valve is closed, said butterfly valve being openable/closable while ensuring sealing characteristics and having a low operating torque even when the resin lining layer is thickened. A lining layer (10) comprising a resin material is provided on a disk (2) surface and on the inner peripheral surface of a body (3), and at least a valve vane portion (20) is sealed by press contact to an inner peripheral seal surface (21) of the body (3) when a stem (5) is rotated. The internal diameter of a sheet liner (11) is configured, when the valve is open, to be an internal diameter (φd2) that is deformed by the elastic force of a backup rubber (4) so as to be smaller than the external diameter (φD1) of the disk (2), whereas said internal diameter of the sheet liner (11) is configured, when the valve is closed, to be an internal diameter (φd1) prior to deformation by the elastic force of the backup rubber to a smaller diameter (4) due to a pressing force from the disk (2), said pre-deformation internal diameter (φd1) being configured to be the same as the disk external diameter (φD1) or somewhat larger than the disk external diameter.

KYU MINHEI (JP)

PCT/JP2015/059448

October 01, 2015

March 26, 2015

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KITZ CORP (JP)

F16K1/226

JP2003166654A	2003-06-13
JPS5645663U	1981-04-23
JP2005024013A	2005-01-27
US3991974A	1976-11-16

KOBAYASHI, TETSUO (JP)
Tetsuo Kobayashi (JP)

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