Baxi 18 System Installation And Service Manual page 67

10 Maintenance
Fig.79 Remove safety pressure relief valve
10.4.4 Safety pressure relief valve
1. Drain the primary circuit.
2. Disconnect the discharge pipe from the valve and remove the seal­
ing grommet.
3. Using a suitable hexagon key undo the grub screw sufficiently to re­
lease the valve.
4. Note the orientation of the valve, rotate it and withdraw it from the
manifold.
5. Fit the new valve and 'O' ring seal and set to the previously noted
orientation. Tighten the grub screw.
6. Reconnect the discharge pipe ensuring the sealing grommet is in
place to maintain the integrity of the case seal.
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