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The 106-RF and 206-RF Singer Flow Limiting Control Valves from HMA Flow & Industrial are based on the 106-PG or 206-PG main valves. These valves are ideal for limiting the flow to a predetermined maximum (via maintaining a continuous pressure differential across an orifice). When the pressure differential is less than the setpoint, the valve opens, allowing flow to meet pre-determined demand.
At the desired maximum setpoint, the pilot reacts to small changes in sensing pressure and controls the main valve position by modulating the pressure above the diaphragm. When the pressure drop across the orifice exceeds the setpoint, the valve closes slightly, limiting the flow to the preset maximum. The orifice is usually sized to generate a pressure differential of 3 to 5 psi/0.2 to 0.35 bar at the desired flow. Adjusting the pilot setting permits the maximum flow to be changed in the field above or below the original point.