Description
RAF 70 & RAF 73 are piloted hydraulic valves activated by line pressure. Normally the RAF 70/73 is partly open to allow a preset constant flow rate.
The flow rate through the RAF 70/73 is determined indirectly using an orifice plate. The headloss across the orifice is proportional to the actual flow rate. On rising headloss, the RAF 70/73 is automatically piloted to close. On the other case, the valve opens. Thus the flow rate is maintained constant, regardless of line pressure fluctuations or the downstream demand.


Applications
Use RAF 70 /RAF 73 Flow Rate Control valve to maintain a compensated constant flow rate to limit the flow downstream. RAF 70 has two-way metal pilot valve for general use in water supply systems of medium pressure rating. The RAF 73 has a three-way plastic pilot valve featuring a cost-effective option for low pressure irrigation or domestic water supply. Apply RAF 70/73 to eliminate excessive pumping or to limit the water demand

RAF 70 - Two-way pilot

RAF 73 - Three-way pilot