Description
RAF 90 & RAF 93 are piloted hydraulic valves activated by line pressure. Normally the valve is open. Only in case of flow rate higher than a preset maximum, due to a burst or excessive demand downstream, the RAF 90/93 are automatically closed down & can reopen 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. The RAF 93 closes automatically whenever the upstream pressure drops below a preset point. It reopens manually.



Applications
Use Anti-Burst Control valve to eliminate water loss & damage due to piping burst. The valve is best in networks susceptible to burst due to old piping, vandalism or pressure surge. The RAF 90 features a metal pilot valve & hydraulic relay to ensure precise & reliable response in general use. The RAF 93 with an all-plastic pilot valve is best for agricultural applications, features a cost effective, simple & reliable command loop.

RAF 90 - Two-way pilot

RAF 93 - Three-way pilot