Instruction Manual

Instruction Manual

D101643X012

ENVIRO-SEAL System - Rotary Valves

November 2011

Figure 4. Typical ENVIRO-SEAL Rotary Packing Arrangements with Graphite Packing for Fisher Vee-Ball, Eccentric

Plug, A41, and 8560 Valves

42B8445-C/DOC

GRAPHITE PACKING

STANDARD DEPTH BOX

STACKING ORDER

GRAPHITE PACKING RINGS

GRAPHITE PACKING, OUT-

BOARD

STANDARD DEPTH BOX

8510B

GRAPHITE PACKING

OPTIONAL DEEP PACKING BOX

V500

NOTES:

APPLY LUBRICANT

THESE TWO SURFACES MUST REMAIN PARALLEL AS YOU ALTERNATELY AND

EVENLY TIGHTEN THE PACKING NUTS (KEY 101)

VALVE WITH SHAFTS LARGER THAN 38.1 mm (1 -1/2 INCH) USE THREE GRAPHITE RINGS

14B0086-A/DOC

Note the following definitions. You will need them for the next few steps. The target load isthepointwherethe

Belleville springs are designed for optimum performance, when they are compressed to 85% of their maximum

deflection, or nearly flat. Maximum deflection is when the springs are 100% compressed, or completely flat.

12. You will obtain maximum benefit from your ENVIRO-SEAL packing system when you tighten the packing flange

nuts and compress the Belleville springs to their “target load”.

To obtain the target load of 85% compression of maximum deflection, perform the following:

D Tighten the packing flange nuts alternately and evenly, keeping the packing flange parallel with the valve flange

(see figure 7), until the Belleville springs are compressed 100% (or completely flat).