Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1985-04-22
1986-02-18
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 26, 277105, 277112, 277124, 277125, 251214, F16J 1510, F16K 4100
Patent
active
045709424
ABSTRACT:
A "fire-resistant" packing arrangement (30) for use with linear motion or rotary motion shafts (20) characterized by a stepped dual diameter packing chamber provided by successive enlargements of the stem bore (22). A primary packing assembly (31) disposed in the chamber section (20b) of smaller diameter and cross-sectional areas and located nearest the fluid pressure provides for sealing under normal temperature and operating conditions. A secondary packing assembly (32) in the larger diameter chamber section (20c) and fabricated of "high temperature" materials is adapted to maintain sealing effectiveness in the event of abnormally high temperatures. A packing support ring (35) disposed in the larger diameter chamber section (20c) intermediate the two packing assemblies and supportable on the shoulder (62) provided by the stem bore enlargement, supports the secondary packing (32) and in the event of a decomposition of the primary packing (51) induced by extreme temperature conditions permits the secondary "high temperature" packing to maintain a seal. A packing retainer ring (38) located at the outer end of the packing arrangement as an outer packing stop is axially adjustable to provide a preload energization of the primary packings.
REFERENCES:
patent: 2684274 (1954-07-01), Saxon
patent: 3019739 (1962-02-01), Prosser
patent: 3175573 (1965-03-01), Vater
patent: 3752507 (1973-08-01), Maurer et al.
patent: 4379557 (1983-04-01), Saka
Diehl Robert J.
Hollister F. Harold
Meyer Danny S.
Joy Manufacturing Company
Marnock Marvin J.
Ward Robert S.
LandOfFree
Dual diameter valve stem packing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual diameter valve stem packing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual diameter valve stem packing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1547552