The RAF 683B pressure reducing & sustaining valve is line pressure hydraulically actuated, 3-W pilot.
The RAF 683B maintains a minimum upstream pressure, as set on the 3-W pressure sustaining pilot and a maximum downstream as set on the 3-W pressure reducing pilot, regardless of flow changes.
The 3-W pilots configuration together with Raphael’s patented diaphragm enable smooth and precise pressure control.
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