13
850 and 950 Series
North America Only
8. Reinstall valve pallets and weights into their proper
chambers. Make sure the lower stem on the
pallet is centered into the valve seat. If the pallet
appears to be o-center to the valve chamber, or
if there is diculty positioning the lid or guide, the
pallet may be inserted improperly.
9. Reinstall weights onto their appropriate
valve pallets.
10. Replace any lid, hood or guide that was previously
removed and fasten securely. When tightening
down lids, make sure the O-ring in each lid has full
contact with the sealing surface.
11. For seat removal, see Figure 7 for the valve
conguration drawings. The valve seats are
installed in machined bores in both the upper
body (pressure) and in the lower body (vacuum)
and are tted with O-ring seals. Remove the
upper body seat by removing the upper body
casting (Model 850) or the Vent Hood assembly
(Model 950). Then remove the seat from the bore.
The lower seat (vacuum) is retained by a Spirolox
®
retaining ring. Remove this ring with a at-bladed
screwdriver as shown above.
Remove ring using a at-bladed screwdriver
Spirolox
®
is a mark owned by Smalley Steel Ring Company.
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