CATEGORY
RAF 88 Surge Anticipating Control Valve
RAPHAEL Valves Industries Control Valves
Description
RAF 88 is adjusted to eliminate hazardouz pressure surges typical of water hammer conditions. A water hammer is caused by an abrupt shutoff of a pump or rapid closure of a main valve, causing a fast propagation of low-pressure font, followed by an extremely hig-pressure back-wave. A series of pressure waves, each one composed of altering low and high pressure is created within a few seconds.
RAF 88 is a piloted hydraulic valve activated by line pressure. The valve has two pilots, gor high and low pressure. Under normal conditions the RAF 88 is closed. It opens when the line pressure drops below a preset pressure, in anticipation to the following surge, and remains open until the fluctuations subside.
Recommended Flow
| Nominal Diameter | Flow Rate M3/h | |
| mm | Inch | Max. |
| 40 | 1.5 | 35 |
| 50 | 2 | 60 |
| 65 | 2.5 | 80 |
| 80-50-80 | 3-2-3 | 60 |
| 80-65-80 | 3-2.5-3 | 100 |
| 80 | 3 | 120 |
| 100-80-100 | 4-3-4 | 120 |
| 100 | 4 | 180 |
| 125-100-125 | 5-4-5 | 200 |
| 150-100-150 | 6-4-6 | 200 |
| 150 | 6 | 400 |
| 200 | 8 | 750 |
| 250 | 10 | 1150 |
| 300 | 12 | 1700 |