Step 8: Assemble the housing bottom to the housing and torque the bolts/nuts, in a star pattern, to the value
specified in Table 2.
Step 1: Thread a 1/2" NPT pipe plug in one of the muffler ports and attach shop air to the other port.
Step 2: Using shop air at a pressure of 3-4 barg, raise the gate to the full open position.
Step 3: With the FAV in the open (up) position, remove the nuts retaining the housing bottom.
Step 4: Remove the housing bottom and gate damper and use a light to inspect the gate to flange areas. If the flange
o-rings have been damaged the flanges will have to be removed and the o-rings replaced. Refer to Section 6.4
for this procedure.
Step 5: Remove the gate damper from the housing bottom and thoroughly clean the housing bottom internal surface
using a solvent. Allow the solvent to dry completely.
Step 6: Remove the corrosion inhibitor pads from the piston and replace.
Step 7: The replacement gate damper has been shipped with an adhesive strip. The application temperature range
for the adhesive is 20°C to 35°C. Remove the release paper from the new damper and center it on the
housing bottom.
Step 8: Apply pressure on the top surface of the damper to provide a uniform bond. At room temperature full bond
strength occurs in 72 hours. At a temperature of 65°C full bond strength occurs in 1 hour.
Step 9: Apply new gasket sealer (vacuum grease) to the sealing surface of the housing bottom.
Step 10: Assemble the housing bottom to the housing and torque the bolts/nuts, in a star pattern, to the value
specified in Table 2.
Step 1: Remove the roll pin access plugs or covers from both sides of the upper FAV housing. Using a punch and
hammer, remove the roll pin from the gate and piston rod assembly.
Step 2: With the slit of the new roll pin oriented to the top or bottom of the FAV, use a punch and hammer to insert
it into the assembly. Replace the roll pin access plugs or covers.
NOTE: Flanges using a dovetail feature on the outside diameter of the o-ring groove do not require an adhesive.
Remove the existing o-ring, clean the groove and press the o-ring into the groove to seat.
Step 1: If o-rings need replacing remove the pre assembly screws from the flanges.
Step 2: Remove the flanges from the FAV assembly. Keep the flange shims with each flange to maintain proper
assembly clearances.
Step 3: Remove the o-rings and all adhesive from the grooves. Clean the grooves using a clean wiper and alcohol or
acetone.
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