Hawle HAWIDO 1405, Manual

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5. Setting the reaction speed
If the HAWIDO does not operate quietly, or pressure surges occur in the supply network, this can be
corrected by adjustment one-way flow restrictor (5).
Procedure:
Loosen the locknut. Screw in the setting screw clockwise with a screwdriver until the valve operates quietly,
and then retighten the lock nut.
Attention:
The setting screw must always remain open by at least 3 - 5 turns; otherwise the valve will not reopen
sufficiently quickly after the closing sequence. A special setting may be required for very high inlet pressures.
6. Checking for leakages
HAWIDOs are tested for both leakage and functionality during manufacture. When checking for leakage
under operational conditions, particular attention must therefore be given to the seals of the flange
connections, the control lines and the central screw plug on the valve cover, and these must be further
tightened if necessary.