RAF 90 is a Normally Open piloted hydraulic valves activated by line pressure. Only in case of flow rate higher than a preset maximum, due to a burst or excessive demand downstream, the RAF 90 are automatically closed down and can re-open manually.
The actual flow rate through the RAF 90 is determined by comparing the headloss across an orifice plate.
The valve is closed down by a hydraulic relay which guarantees a tight closing and manual re-opening.
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