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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

106 / 206-PR-R Pressure Reducing and Pressure Sustaining Valve

The valve shall be a Singer Valve model 106-PR-R / 206-PR-R, size “_____”, ANSI Class 150 (ANSI 300, ANSI flanges drilled to ISO PN 10 / 16 / 25 or 40) pressure rating / flange standard, globe (angle), style valve. The Model 160 Pressure Reducing Pilot (Normally Open Pilot) spring range shall be “___ to ___” psi / “___ to ___” bar, with set-point preset at Singer Valve to “___” psi / “___” bar.
The Model 81-RP Pressure Relief Pilot (Normally Closed Pilot) spring range shall be “___ to ___” psi / “___ to ___” bar, with set-point preset at Singer Valve to “___” psi / “___” bar. Assembly shall be according to Schematic A-0332C.
The valve shall maintain relatively accurate control of the downstream pressure regardless of fluctuation in flow or upstream pressure until the upstream pressure drops to a pre-determined value.
The sustaining pilot shall override the pressure reducing function at such time as the upstream pressure drops to the pre-determined value maintaining relatively steady upstream pressure.
Refer to Main Valve section, page 11, 106-PG or 206-PG for detailed information pertaining to valve sizes and materials, selection criteria and specifications.
Refer to Pilot and Accessories, page 249, section, Model 160 Pressure Reducing Pilot (Normally Open Pilot), Model 81-RP Pressure Relief Pilot (Normally Closed Pilot) and Model 26 Flow Stabilizer for detailed information pertaining to materials and specifications.