Description
RAF 80 & RAF 83 are piloted hydraulic valves activated by line pressure. The pilot valve has a spring- loaded membrane which is exposed to the upstream pressure. The valve is normally closed. Only when the line pressure rises above a preset point, the RAF 80/83 opens to relieve the excessive pressure downstream without causing surge hazards. When the line pressure drops the RAF recloses.

Applications
Use the pressure sustaining/relief valve to maintain constant upstream pressure & to avoid undesirable high pressure. This protection is required for most irrigation devices, domestic & industrial utilities.
Use RAF 80 for general water supply systems with medium pressure rating. The elaborated 2-way command with Raphael's patented diaphragm enables smooth & precise pressure control. The plastic pilot model, RAF 83, provides high resistance to corrosion & cost-effective price. It is best for irrigation, filtration manifolds, water treatment circulation & low pressure domestic applications

RAF 80 - Two-way pilot

RAF 83 - Three-way pilot