2024年4月23日发(作者：)

专利内容由知识产权出版社提供

专利名称：VALVE STEM PACKING STRUCTURE

发明人：HAMID J. SAKA

申请号：AU8015082

申请日：19820203

公开号：AU551106B2

公开日：19860417

摘要：A "fire-safe" packing arrangement (104) for a valve stem (72) which extends

through a packing chamber in a valve bonnet bore (42) to a valve chamber (50) in a valve

body (12). The packing arrangement (104) comprises a low temperature packing

assembly (112)positioned within the packing chamber between the stem (72) and the wall

of the bonnet bore (42) for sealing therebetween at normal temperatures and resting on

an inner annular shoulder (62) provided in the bonnet bore (42). A metal spacer ring (116)

is positioned within the packing chamber axially outward of the low temperature packing

assembly (112) with respect to the flow passage (18, 20) through the valve. The spacer

ring (116) has a lower side or inner end (140) thereof resting on the low temperature

packing assembly (112). The packing arrangement includes a high temperature packing

assembly (114) positioned within the packing chamber between the stem (72) and the

wall of the bonnet bore ( 42) and axially outward of the spacer ring (116) with respect to

the flow passage (18, 20). The high temperature packing assembly (114) is sandwiched

between the outer end portion (138) of the spacer ring (116) and a retainer (106) seated

on an annular shoulder (58) provided in the bonnet bore (42). The high temperature

packing seals between the stem (72) and the valve body (12) at above normal

temperature conditions of the valve body (12) which are destructive of the low

temperature packing assembly (112). The packing arrangement (104) effectively seals

throughout the range of low and above normal temperatures without imposing frictional

drag on the valve stem.

申请人：JOY MANUFACTURING CO.

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