PTFE graphite packing sleeves are used in many brands of AB cocks to prevent leakage and to ensure effective opperation. PTFE Packing Sleeves are made from modified PTFE, which helps the sleeves keep solid and high strength in high temperature working condition.PTFE packing sleeves usually do not need steel eyelet.
Fitting around to spindle to ensure its smooth action and prevent leakage The effective sealing properties of PTFE, combined with the ease with which it can be removed and replace ensure PTFE is the material of choice. A popular application of PTFE sleeve is to seal the drain cocks for level gauges (see. fig. below). The use of PTFE sleeves provides smooth and reliable operation of the cocks and high resistance to erosive action of the medium and pollution.
The size of sleeve must be exactly matched to the size of the valve (cock). PTFE packing sleeves come in a range of standard sizes as listed below: