Singer Pressure Reducing Valves sense the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to maintain a steady downstream pressure.
The 106-PR-48, and 206-PR-48 series Pressure Reducing Valves with low flow by-pass are based on the 106-PG, or 206- PG main valve. A direct acting pressure reducing valve is piped in parallel, using the main valve back port connections.