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3. Next, remove the four (4) 3/8 in . hex head bolts holding the sampler to the gate valve . Turn the insertion/
extraction handle at the end of the actuator assembly in a counter clockwise direction . The actuator assembly
should now start to withdraw from the Gate Valve . When the air cylinder's end cap has stopped against the
insertion/extraction tool's end plate, the sampler's wear sleeve should be clear of the travel path of the valve's
"knife, " but still sealing inside the bore of the Gate Valve . Now turn the handle on top of the Gate Valve until the
Gate Valve is completely closed .
4. Open any bleed port valves on the gate valve to allow any excess pressure inside the gate valve or sampler's wear
sleeve to be released .
5. Remove the four (4) 3/8 inch button head screws holding the end plate to the side rails . The actuator assembly,
complete with the insertion/extraction tool, now can be removed . Remove the rails and install the blanking flange
on the valve .
6. Remove the four (4) 316 SS dome head nuts holding the sample chamber to the rod gland . The air cylinder
assembly, complete with the process seals assembly still connected to the piston rod, now can be removed from
the main sample chamber . Using a suitable spanner, separate the spool assembly by unscrewing the end process
seal mount/nut while holding the piston rod with another spanner .
7. Clean the disassembled spool assembly and replace any worn parts . Fit new process seals back onto the seal
mounts . Thread each seal mount back onto the M16 stud and tighten it down by gripping it with a pair of
multigrips pliers while holding the end seal mount with a wrench . Refer to the accompanying actuator assembly
drawing for lubricants, sealants and torque values .
8. Inspect and clean the sample chamber wear sleeve . Fine grade emery paper can be used on the bore to remove
any light scratches or product build-up . If a new process seal will slide easily through the old wear sleeve with any
clearance, the wear sleeve needs to be replaced . To replace it, loosen the set screw located on the side of the main
sample chamber behind the sampler's discharge port, then remove the wear sleeve out the front of the sampler .
Replace the wear sleeve o-rings located in the bore of the main sample chamber if required . Ensure the discharge
port and flush port openings on the wear sleeve align with those in the sample chamber .
9. Insert the completed air cylinder assembly back into the wear sleeve/sample chamber and reinstall the four
(4) 316 SS dome head nuts in accordance with the accompanying actuator assembly drawing . The seal/spool
assembly will be tight and may require use of a suitable process compatible lubricant .
10. Slide the now fully reassembled actuator assembly back onto the side rails and insert the actuator partially back
into the gate valve until the 3/8 in . tapped holes in the endplate align with the holes on the side rails . Screw in and
tighten the four (4) 3/8 inch button head bolts in accordance with the accompanying actuator assembly drawing .
Do not open the gate valve yet . Continued insertion is a reversal of steps 2, 3 and 4 . Refer to the accompanying
actuator assembly drawing for lubricants, sealants and torque values .
Air Cylinder Seals Change-Out
Change-out of the air cylinder seals is completed in much the same way as the process seals change-out; however,
these seals should not need replacing as often as the process seals and should be replaced only on an as-needed
basis .
1. To remove the actuator assembly from the process line, please refer to and follow steps 1-6 of the Process Seals
Change-Out section of this manual .
2. Remove the four 316 SS dome head nuts and remove the cylinder end cap . Separate the barrel(s) and the piston/
rod assembly from the rod gland . When servicing a neutral position actuator, the middle rod gland slides off the
end of the four (4) tie rods, allowing access to the first air cylinder . Remove the worn seals from the rod gland,
piston(s) and end cap . Usually only the piston and rod gland seals need replacing .
ISOLOK SAL-Q Sampler
9
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