Valves used in Pipelines - VALVE ACCESSORIES PDF Print E-mail
Written by Norrie   
Sunday, 02 May 2010 18:18
Article Index
Valves used in Pipelines
TYPES OF VALVES - GATE VALVE
TYPES OF VALVES - THE GLOBE VALVE
TYPES OF VALVES - NEEDLE, ANGLE, PLUG, BALL, BUTTERFLY, CHECK VALVE
SAFETY RELIEF VALVES
VALVE ACCESSORIES
VALVE OPERATORS
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VALVE ACCESSORIES

1. STUFFING BOX and PACKING (See Figure : 22)

Packing is a means of preventing leakage around the valve stem to atmosphere. The packing is placed in the 'Stuffing Box' around the stem. It is then held in place and compressed by the 'Gland' and 'Gland Follower' to give a leak-tight seal.

However, having the packing too tight can cause the operation of the valve to be stiff. When tightening down on the packing does not stop leakage or causes valve operation to be stiff, the packing should be replaced.

In some larger valves, a 'Lantern Ring' is inserted between the turns of packing and is placed opposite to a lubrication point where grease can be injected in order to ease the valve operation.

Figure : 22