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Singer Valve - Model 106/206-PR-R -Pressure Reducing and Pressure Sustaining Valve
The 106-PR-R and 206-PR-R pressure reducing and pressure sustaining valves are based on the 106-PG or 206-PG main valve with the addition of the sustaining pilot 81-RP and pressure reducing pilot PR-160. Provided the upstream pressure setting is satisfied, the 81-RP pilot is kept open, permitting the valve to be controlled by the 160 pilot. The 160 pilot senses downstream pressure and under flowing conditions, it reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm.
Should high demand cause the inlet pressure to fall to the 81-RP pilot setting, the upstream pressure has priority and the valve will modulate to prevent the upstream pressures from dropping below the set-point.
When the valve is modulating to sustain upstream pressure above the minimum 81-RP pilot set-point, the downstream 160 pilot may try to open the valve to maintain its set-point, but upstream has priority and downstream pressures will fall below expectations.
In typical applications, the reduced port model 206-PR-R is often the best selection.
- Excellent low flow stability
- Ensures minimum upstream pressure
- Easily and precisely set downstream pressure
1. Main Valve - 106-PG or 206-PG
2. Isolation Valve - standard 4 in / 100 mm and larger
3. Strainer - standard 4 in / 100 mm and larger
4. Model 26 Flow Stabilizer / Opening Speed Control
• Standard on valves 8 in / 200 mm 106,
10” / 250 mm 206 and smaller
5. Fixed Restriction
6. Isolation Valve - standard 4 in / 100 mm and larger
7. Model 160 PR pilot
• Specify for 5 to 50 psi / 0.35 to 3.5 bar,
10 to 80 psi / 0.70 to 5.5 bar,
20 to 200 psi / 1.38 to 13.8 bar,
100 to 300 psi / 6.9 to 20.7 bar.
8. Isolation Valve - standard all sizes
9. Model 81-RP pilot - specify for 5 to 50 psi / 0.35 to 3.5 bar; 10 to 80 psi / 0.7 to 5.5 bar; 100 to 300 psi / 6.9 to 20.7 bar; 20 to 200 psi / 1.38 to 13.8 bar standard.
Standard materials for pilot system components are:
- ASTM B62 bronze or ASTM B16 brass
- AISI 303/316 stainless trim