Idex FITZPATRICK D6B Operating Instructions Manual page 15

The Fitzpatrick Company
3.5 Procedure for Proper Rotary Valve Packing Adjustment
The infeed and discharge rotary valve are supplied with an air seal ring and a backup piece
of packing on each rotor shaft end. The air seal helps keep product from leaking out of the
rotary valve. The packing ensures powder no-leak integrity.
1. Install the air seal ring in each rotary valve endcap.
2. Place the packing behind the air seal ring.
3. Install the packing gland and secure loosely with (2) hex head screws.
DO NOT TIGTHEN AT THIS TIME.
4. Only after the rotor has been installed and the end caps have been bolted on the
rotary valve body can the packing glands be tightened. Tighten the packing gland
screws until hand tight, applying light pressure to the packing.
5. Using a wrench, tighten each bolt ¼ to ½ turn (beyond hand tight) to apply additional
compression to the packing.
Tighten the packing gland hex screws just enough to prevent product leakage. Over
tightening the packing gland can cause excessive heat, premature wear and shorten
packing life.
Packing
Gland
Packing
Gland Screw
A Unit of Corporation
D6B Manual Ver 1_24 Jan 2012-DRAFT.doc
3.5.1 Rotary Valve Cross Section
Packing
Air Seal
Ring
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