JFD Divex SLS Mk IV, Operation And Maintenance Manual

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76 OM131
Chapter 4 P1939-OM-131 R11
8. Check the valve seat (Fig 5.12, Item 3) for wear and replace as necessary. If the valve seat or
valve stem (Fig 5.12, Item 4) has been replaced then the roller fork (Fig 5.12, Item 12,) may
require adjustment, as follows:
a. With the regulator mechanism assembled check the play on the roller fork (Fig 5.12, Item 12).
It should be slack and have approximately 2mm of movement without allowing the regulator
to flow.
b. If the movement is greater than this, adjust by tightening the grub screw (Fig 5.12, Item 21).
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This screw is locked in place with a thread retaining compound and must therefore be resealed if
adjustment is made.
Ensure that NO thread locking compound is located NEAR the roller fork for the shuttle as this will
cause the regulator to malfunction.
a. By using a straight edge across the top of the regulator body (Fig 5.12, Item 1) check that the
roller on the roller fork (Fig 5.12, Item 12) lies approximately 1mm above the top face of the
regulator. If not then gently bend the roller fork until it is.
9. Replace all O-rings. Lightly lubricate O-rings before re-assembly using an oxygen compatible
lubricant (e.g. Christo-lube fluorinated grease - Divex Part No SM034).
10. Re-assembly is the reverse of the above.
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The valve seat is installed with its chamfer towards the valve stem.
4.3.4.5 Perform six monthly maintenance
1. Carry out the six monthly maintenance schedule in accordance with section 4.3.3 of this
Manual.