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DO NOT nick or scratch seal seats
5. If any seal is worn flat on the outside diameter, torn, scored or experiencing chemical degradation, remove seals
from carriers and sleeve .
6. Check to ensure spindle is not bent and all parts are smooth and free of score marks . Scored or damaged parts
should be repaired or replaced .
7. Reassemble the components of the plunger assembly in reverse order of disassembly . If you are unsure of
component orientation, reference the attached drawings .
8. Reinstall plunger assembly onto piston rod and tighten with wrenches .
9. Replace the pipe plug in the rear cylinder head .
10. Apply air pressure to port B to return the sampler to the fully retracted position before reinstalling .
Sampler Seal Replacement
1. Remove plunger assembly as described above .
2. Remove the four (4) nuts and washers retaining the rear cylinder head .
3. Remove rear cylinder head and rear cylinder tube .
4. Remove rear piston and rod assembly .
5. Remove four (4) tie rods from center cylinder head .
6. Remove four (4) bolts holding front cylinder together .
7. Remove center cylinder head .
8. Remove front cylinder tube and piston .
9. Remove and replace all cylinder head to cylinder tube O-rings .
10. Remove and replace two (2) rear piston seals .
11. Remove and replace two (2) front piston OD seals and two (2) front piston ID seals .
12. Remove and replace center cylinder head ID seal .
13. Remove and replace inner spacer, rear inner seal .
14. Remove and replace rear sleeve outer seal (front nose of sampler) .
15. Inspect bore of cylinder for scoring or wear . Wipe out with a dry, non-abrasive cloth .
16. Wipe seals with a light film of Dow Molykote® 33 Grease (or process compatible equivalent) as aid in assembly .
17. Reassemble sampler in reverse order of disassembly .
Valve Stem Packing Adjustment
ƒ The block valve stem packing nut is adjusted from the factory to pass a 550 psi (37 .9 bar)
leak test . If the process pressure being sampled is less than the maximum rating of the
valve, a looser stem packing adjustment may be desirable for ease of manipulation and
longer seal life .
ƒ To adjust the stem packing nut, remove the block valve handle and loosen or tighten the
packing nut using the optional valve packing nut wrench (see DBB Tools list) .
Sentry ISOLOK SAL-DBB Sampler
11
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