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Vonk Choke Valves
September 2019
Retightening Nuts Body Bonnet Connection
Due to the design of the choke valve, the nuts of the studs (body-bonnet connection) needs to be tightened
sufficiently to provide a proper connection.
Valve Internals and Bonnet Maintenance
A replacement set of soft seals is required.
Disassembly
1. Complete steps 1 to 10 of the Maintenance of Valve Internals Disassembly section in this manual.
2. Take the shaft key out of the bonnet shaft and push the bonnet shaft out of the bonnet.
3. Remove all the seals, bearings,and scrapers.
4. Clean all the parts.
5. Clean all the sealing surfaces of bonnet and shaft very carefully and inspect them for corrosion, pitting or scratches.
Assembly
1. Complete steps 1 to 13 of Maintenance of Valve Internals Assembly section in this manual.
2. Grease all the sealing surfaces with PTFE spray lubricant.
3. Mount seals, bearings, and scrapers on the bonnet shaft. (For correct position, refer to applicable drawing and parts
list.)
Note
For easy mounting, the O-ring needs to be pushed in (create a heart shaped form), to decrease the outer diameter. When the
O-ring is in position push it back to its original shape.
4. Check if all the seals are mounted correctly (per applicable drawing and parts list) and fully in position.
5. Grease the seals with PTFE spray lubricant.
CAUTION
The seals are easily damaged. The right way to mount the seal holder is to carefully and gently push while turning it over
the bonnet shaft.
6. Mount the remaining seals around the bonnet. Then mount bearings and grease all with PTFE spray lubricant.
7. Push the bonnet shaft gently to the bonnet.
8. Place the bonnet on the body. Be sure the adjusting pin is placed in the hole of the protecting bush.
(1-inch TS bonnet has no adjusting pin.)
9. Complete steps 11 to 13 of the Maintenance of Valve Internals Assembly section in this manual.
8
Instruction Manual
D104485X012
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