Title:
SHAFT SEAL PACKING AND SHAFT SEAL STRUCTURE FOR VALVE
Document Type and Number:
WIPO Patent Application WO/2008/007685
Kind Code:
A1
Abstract:
A shaft seal packing exhibiting high sealing ability in initial assembly and also
exhibiting, even after the packing is retightened, excellent sealing ability by
an increased seal surface pressure obtained through an effect of pressing and
by self-sealing ability obtained through an effect of fluid pressure. A valve element
installed in a valve body is provided so as to be rotatable about or liftable along
a valve shaft. The shaft seal packing is installed in a shaft seal chamber of a valve
in which the valve shaft is set. The shaft seal packing is used for a shaft seal structure
for the valve, and in the shaft seal packing, annular packing bodies having a generally
V-shape cross- section are stacked on each other, the stack surfaces on the inner
diameter side are made to be in intimate contact with each other, and a predetermined
gap is formed between adjacent stack surfaces on the outer diameter side. In the
shaft seal structure, force applied to the packing bodies by tightening force
and fluid pressure is converted into radial force by the taper angle of the stack
surface on the inner diameter side. This causes the inner peripheral surfaces
of the packing bodies on the inner diameter side and the outer peripheral surface
of the valve shaft on the sliding side are sealed between each other by surface
contact, and also the gaps allow lip parts on the outer diameter side to be pushed
and expanded, causing the lip parts and the shaft seal chamber on the fixed side
to be sealed between each other by line contact.
Inventors:
SUGITA YASUNORI (JP)
YAMASHITA YOSHIHIRO (JP)
YAMASHITA YOSHIHIRO (JP)
Application Number:
PCT/JP2007/063789
Publication Date:
January 17, 2008
Filing Date:
July 11, 2007
Export Citation:
Assignee:
KITZ CORP (JP)
SUGITA YASUNORI (JP)
YAMASHITA YOSHIHIRO (JP)
SUGITA YASUNORI (JP)
YAMASHITA YOSHIHIRO (JP)
International Classes:
F16J15/24; F16K41/04
Foreign References:
| JPH0519735U | 1993-03-12 | |||
| JPH08145187A | 1996-06-04 | |||
| JPH10231823A | 1998-09-02 | |||
| JPH09509726A | 1997-09-30 | |||
| JP2006064111A | 2006-03-09 | |||
| JPH0821537A | 1996-01-23 | |||
| JPS6330665A | 1988-02-09 | |||
| JPS4528813Y1 | 1970-11-06 | |||
| JPS39762Y1 | ||||
| JPH10231823A | 1998-09-02 |
Other References:
See also references of EP 2045489A4
Attorney, Agent or Firm:
KOBAYASHI, Tetsuo (3-6 Toranomon 1-chom, Minato-ku Tokyo, JP)
Download PDF: