Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1990-05-31
1991-09-03
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
251181, 251309, 251314, 277110, 277116, 277123, 277169, F16K 4104, F16K 2500, F16K 514
Patent
active
050446061
ABSTRACT:
A valve stem and packing assembly is provided in which a rotatable valve stem includes a first tractrix surface for sliding contact with a stem packing and also includes a second tractrix surface for sliding contact with a bonnet. Force is applied by means of a spring, gland flange, and gland on the stem packing so the stem packing seals to the valve stem and bonnet. This configuration serves to create and maintain a reliable seal between the stem packing and the valve stem.
The bonnet includes a second complementary tractrix surface for contacting the second sliding tractrix surface, the combination serving as a journal bearing for the entire valve stem and packing assembly. The journal bearing so configured is known as a Schiele's pivot. The Schiele's pivot also serves to maintain proper alignment of the valve stem with respect to the bonnet. Vertical wear between the surfaces of the Schiele's pivot is uniform at all points of contact between the second sliding tractrix surface and the second complementary tractrix surface of a bonnet.
The valve stem is connected to a valve plug by means of a slip joint. The valve is opened and closed by rotating the valve stem. The slip joint compensates for wear on the Schiele's pivot and on the valve plug.
A ledge is provided on the valve bonnet for the retaining nut to bear against. The ledge prevents overtightening of the retaining nut and the resulting excessive friction between stem and stem packing.
REFERENCES:
patent: 128906 (1872-07-01), Reed
patent: 131799 (1872-10-01), Vreeland et al.
patent: 272819 (1883-02-01), Wilbraham
patent: 606754 (1898-07-01), Armstrong
patent: 734633 (1903-07-01), Titus
patent: 1139120 (1915-05-01), Hoffman
patent: 1799335 (1931-04-01), Waddell
patent: 1928122 (1933-09-01), Bennett
patent: 2537230 (1951-01-01), Mueller
patent: 2573832 (1951-11-01), Callahan
patent: 3033581 (1962-05-01), Sims
patent: 3038694 (1962-06-01), Dunbeck et al.
patent: 3386699 (1968-06-01), Petter et al.
patent: 3807692 (1974-04-01), Usab et al.
patent: 3815870 (1974-06-01), Milleville et al.
patent: 4809993 (1989-03-01), Henshaw
patent: 4878652 (1989-11-01), Wordin
"Advanced Mathematics for Engineers", Reddick and F. H. Miller, John Wiley and Son, 1955, pp. 102 and 103.
Albrecht John M.
Cordell Helen S.
Moser William R.
The United States of America as represented by the United States
Walton George L.
LandOfFree
Valve stem and packing assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve stem and packing assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve stem and packing assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1002650