Fisher D4 Instruction Manual page 20

D4 Valve
July 2015
8. Install the Belleville springs (key 11). The Belleville springs (key 11) should be single stacked with the I.D. of the
inner spring contacting the packing spacer (key 14) and the O.D. of the outer spring contacting the packing retainer
(key 10). The final Belleville spring should be within the 1.26 inch diameter bore of the bonnet.
9. Adjust the packing retainer by hand until it makes contact with the Belleville springs. Do not tighten by hand, simply
install the packing retainer until it makes contact with the Belleville springs. Tighten the packing retainer clockwise
precisely 1.16 turns (7 flats on the retainer) to seat the packing. This should fully compress the Belleville springs as
detected by an increase in torque between 6 and 7 flats.
10. Loosen the packing retainer completely. Adjust the packing retainer by hand until it makes contact with the
Belleville springs. Do not tighten by hand, simply install the packing retainer until it makes contact with the
Belleville springs. Tighten the packing retainer clockwise precisely 1/2 turn (3 flats on the retainer).
11. Lock the packing retainer (key 10) solidly in place by tightening the packing retainer locknut (key 22) using a
spanner wrench or a hammer and punch or chisel.
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Chatham, Kent ME4 4QZ UK
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www.Fisher.com
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E 2002, 2015 Fisher Controls International LLC. All rights reserved.
Instruction Manual
D103042X012