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1. WO1997029309 - RETROFIT VALVE STEM SEAL ASSEMBLY

Publication Number WO/1997/029309
Publication Date 14.08.1997
International Application No. PCT/US1997/001817
International Filing Date 31.01.1997
IPC
F16K 41/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
41Spindle sealings
02with stuffing-box
CPC
F16K 41/026
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
41Spindle sealings
02with stuffing-box ; ; Sealing rings
023for spindles which only rotate, i.e. non-rising spindles
026for rotating valves
Applicants
  • WORDIN, John, J. [US]/[US]
Inventors
  • WORDIN, John, J.
Priority Data
08/600,40312.02.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) RETROFIT VALVE STEM SEAL ASSEMBLY
(FR) ENSEMBLE ETANCHEITE INSTALLE APRES COUP SUR UNE TIGE DE SOUPAPE
Abstract
(EN)
A retrofit valve stem seal assembly (100), which can be retrofitted to existing quarter-turn valves already in service, is provided. The retrofit valve stem seal assembly is added to the valve stem (2) by inserting a valve stem adaptor (3) onto the valve stem and firmly attaching the adaptor to the valve stem. The inner surface fo the valve stem adaptor fits on the valve stem. To prevent leaks between the valve stem adaptor and the valve stem 'O' rings (5) are installed in the valve stem adaptor to bear against the valve stem. A rotatable valve stem adaptor includes a sliding tractrix surface (7) for sliding contact with a stem packing (6). The stem packing includes a complementary tractrix surface (8) for contacting the sliding tractrix surface on the valve stem. Wear between the contacting surfaces is uniform at all points of contact between the sliding tractrix surface and the complementary tractrix surface, creating and maintaining a dynamic seal.
(FR)
On décrit un ensemble étanchéité (100) destiné à une tige de soupape et que l'on peut installer après coup sur des soupapes quart de tour déjà en service. On pose cet ensemble sur la tige (2) de la soupape en insérant un adaptateur (3) de tige de soupape sur la tige et en le fixant solidement sur celle-ci. La surface intérieure de cet adaptateur s'ajuste sur ladite tige. Afin d'empêcher toute fuite entre l'adaptateur et la tige, on a monté des joints toriques (5) dans l'adaptateur, lesquels doivent appuyer contre la tige de la soupape. Un adaptateur rotatif comporte une surface tractrice coulissante (7) destinée à entrer en contact par coulissement avec une garniture (6) de tige, laquelle garniture présente une surface tractrice complémentaire (8) destinée à entrer en contact avec la surface tractrice coulissante de la tige de soupape. L'usure entre les surfaces de contact est uniforme au niveau de tous les points de contact entre la surface tractrice coulissante et la surface tractrice complémentaire, l'agencement de ces surfaces créant et maintenant une étanchéité dynamique.
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