Valve packing

Details Valve packing Valve packing

F - Mech Eng,Light,Heat,Weapons

16

K

251/72

F16K 3/00 (2006.01) F16K 3/26 (2006.01) F16K 39/02 (2006.01) F16K 39/04 (2006.01) F16K 41/00 (2006.01)

Patent

CA 1112632

ABSTRACT OF THE DISCLOSURE In a valve structure, a valve plug apparatus to pro- vide a leak-tight valve shut-off, is disclosed. The valve structure includes a valve body provided with an inlet passage, an outlet passage and an internal web portion intermediate the inlet and outlet passages. A closeable passage-forming means is arranged in the web portion and a two-member valve plug is mounted on a valve stem for controlled axial movement within the web portion and operate to close said closeable fluid passage- forming means to shut the valve. In accordance with the inven- tion, the two-member valve plug comprises a lower plug member and an upper plug member which are in a generally axially spaced relation on the valve stem. Packing means is held in a snug- fitting condition between the lower and upper plug members by an axially resilient member which acts between one end of the valve stem and the valve plug to urge the lower and upper plug members together. When the two-member valve plug closes the closeable fluid passage-forming means, a force is transmitted by the valve stem directly through the upper plug member to the packing means to form a leak-tight seal for the valve plug. The stem force is also transmitted through the packing means and lower plug member to generate a seating force between the valve plug closeable fluid passage-forming means for tight valve shut-off. ABSTRACT OF THE DISCLOSURE

336791

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