Stem tip seal

Details Stem tip seal Stem tip seal

1986-02-14

1987-04-21

Rosenthal, Arnold

Valves and valve actuation

Reciprocating valve

Diverse material seal at valve interface

251210, F16K 136

Patent

active

046590609

ABSTRACT:
A stem tip seal for a shut-off valve including a valve member adapted for selective movement axially toward and away from an associated valve seat. A generally cylindrical sleeve is carried by the valve member and has an end defining an outer annular seal surface adapted for cooperative sealing engagement with the seat. Mounted centrally within the sleeve for limited axial movement is a rigid cylindrical body that defines a first inner annular seal surface adapted for engagement with the seat at a location radially inwardly of the outer annular seal surface. Formed between the sleeve and the rigid body is an annular chamber which opens axially inwardly from a narrow slot located between the first inner annular seal surface and the outer annular seal surface. A mass of resilient packing material substantially fills the chamber and extends axially outwardly of the slot to define a second inner annular seal surface. Means are associated with the rigid body for generating pressure on the packing material when the body is forced axially toward the valve member. In addition, the first inner annular seal surface is configured to engage the seat prior to engagement by either the second inner annular seal surface or the outer annular seal surface.

REFERENCES:
patent: 2414908 (1947-01-01), Smith
patent: 2885176 (1959-05-01), Bryant
patent: 2936154 (1960-05-01), Von Platen et al.
patent: 3084903 (1963-04-01), Parks
patent: 3095900 (1963-07-01), Newhall
patent: 3809362 (1974-05-01), Baumann
patent: 4341370 (1982-07-01), Banks

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