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6.1 Replacing the stem O-ring seal (BFS/BRS valves)
WARNING:
Do not remove or disassemble a pressurised valve!
· Make sure that all spare parts needed for maintenance are available.
· Keep the valve and the pipeline non-pressurised whenever the gear is not connected.
· Remove the actuator as instructed in chapter 5.
· Disconnect the key (3) from the stem (5).
· Remove the retaining ring (1).
· Pull the O-ring sleeve (2) out using an extraction tool. Check that the stem is intact, and clean it
carefully.
· Lubricate the O-rings with, for example, Würth HHS2000 lubricant spray. Replace the O-rings on the
O-ring sleeve.
· Check that there are no sharp edges on the place for the key groove, elsewhere on the stem, or on
the stem sleeve, as these could damage the O-rings during installation. Hone or tape over any sharp
edges if necessary.
· Push the O-ring sleeve back in place. We recommend using an insertion tool.
· Re-insert the retaining ring and the key.
· Install the actuator as instructed in chapter 5.
For Part numbers please refer to Parts list, Appendix 7.1.
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