5/Maintenance
5-4 1503-0151-000 5/26/0
3. Inspect the flapper and valve seat for nicks, debris and cleanliness.
4. Pull the tail of the new free breathing valve flapper through the cen-
ter of the valve seat until it locks in place.
5. Trim the tail in line with the bottom edge of the valve seat, see
figure 5-3.
Figure 5-3
Free Breathing Valve flapper replacement
6. Replace the O-ring. Lubricate with a thin film of KRYTOX
™.
7. Back the seat threads counter clockwise until you feel the thread
engage. Hand screw the assembly into the manifold.
8. Replace the deflection tube on the valve. The tube has a rolled edge.
Ensure that the edge slips over the ridge of the valve seat.
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