IM-IBR17-49IN Issue 1 23
Unscrew element assembly
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Remove the cover nuts (2) and cover.
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Undo the 4 main valve assembly nuts (7).
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Remove the main valve assembly (5) and gasket (6).
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Ensure gasket faces are clean and dry.
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Fit new gasket (6) and main valve assembly (5).
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Tighten nuts (7) evenly (see Table 2 for the recommended tightening torques).
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Re-use or replace the ball float (8) as required.
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Replace cover gasket (3) ensuring the gasket face has been cleaned.
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Replace the cover, ensuring the dowel is located correctly.
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Retighten the cover nuts (2) evenly (see Table 2 for the recommended tightening torques).
How to fit the capsule air vent assembly:
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Remove the spring clip, capsule, spacer plate, unscrew the seat and remove the frame
(17) and gasket (18).
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Ensure the gasket faces are clean and dry.
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Fit the new gasket (18), frame and seat (17) and tighten evenly (see Table 2 for the
recommended tightening torques).
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Assemble new spacer plate, capsule and clip.
How to fit the bimetallic air vent assembly for DN15 to DN100:
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Unscrew and remove the element assembly (17) and gasket (18).
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Ensure the gasket faces are clean and dry.
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Fit the new gasket (18) and element assembly (17) and tighten evenly to the recommended
torque (see Table 2).
Table 2 Recommended tightening torques
Item No.
or
mm
N m (lbf ft)
2 24 A/F M16 x 45 80 - 88 (58 - 65)
7 13 A/F M8 x 20 20 - 24 (15 - 17)
17 17 A/F 50 - 55 (37 - 40)
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