Dynamic Lifter Air Operated Pressure Relief Valve
Surge Anticipating Electronically Timed DL Pressure Relief Valve
The Model A106-DL-Air is a compact sewage relief valve that is suitable for high pressures up to 200 psi, responds very quickly and retains all the features and benefits of the Model A106-DL Spring– Hydraulic version. It is an attractive solution to what may be otherwise a difficult application due to higher pressures or space height limitations.
The Model A106-DL-Air-ET retains all the features and benefits of the Model A106-DL-Air with the additional feature of two 3-way solenoid valves which forces the valve open upon power failure.
For the Singer Model A106-DL-Air-ET, utilize the above specifications and include this additional specification:
Dynamic Lifter Spring Pressure Relief Valve
The A106-Dynamic Lifter (DL) sewage pressure relief valve is a direct acting spring loaded relief valve.
The valve is adjusted to open when the pressure exceeds the set-point, which is approximately 10% above the normal operating pressure. The valve closes drip-tight when pressure falls below the set-point. The DL is connected on a tee off the main line and usually discharges relief flow back to the main sump to reduce the surge over-pressure. A speed control permits adjustment of the closing speed.
The opening force is boosted by the line pressure operating, via the separation chamber, on the piston. By applying external pressure to the test connection, the valve may be cycled open for routine maintenance.
• raw water that contains organics
• lower pressure sewage lift stations
• booster sewage stations
Pressure Relief Valve
The 106-RPS and 206-RPS pressure relief valves are based on the 106-PG and 206-PG main valves.
The 81-RP pilot senses the upstream pressure through a connection to the valve inlet. The valve and pilot remain closed until the inlet pressure exceeds the pilot setting. The valve opens rapidly to relieve damaging overpressure and closes smoothly at an adjustable speed, when the pressure returns below the set-point. The upstream pressure is limited to the pilot set-point.
Pressure Sustaining Valve
The 106-RPS and 206-RPS pressure sustaining valves are based on the model 106-PG or 206-PG main valve.
The 81-RP pilot senses the upstream pressure through a connection to the valve inlet. The valve and pilot remain closed until the inlet pressure exceeds the pilot setting.
Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm.
Should the upstream pressure fall below the set-point, the valve will close or modulate to ensure that the set-point is maintained.
Surge Anticipating on Rate of Rise of Pressure Relief Valve
The 106-RPS-RR and 206-RPS-RR surge anticipating relief on rate of rise valves are based on the 106-PG or 206-PG main valve.
The valve is installed downstream of the pump check valve(s) and has two pilots, the 81-RP and the 81-RPD. Both pilots sense pressure through a connection to the header pipe. The 81-RP high pressure pilot acts as a standard relief pilot, opening on excessive pressure. The 81-RPD differential pilot responds to the pressure differential across its diaphragm. A pressure differential is created when there is a system pressure increase. The flow into the accumulator creates a pressure drop across the fixed restriction, which lowers the pressure in the connection between the fixed restriction and the pilot.
The pilot senses the pressure difference between this lower pressure and the header pressure. This difference occurs at the initiation of the pressure surge, providing the time necessary for the valve to open in anticipation of the high pressure.
Surge Anticipating Relief Valve
The 106-RPS-L&H and 206-RPS-L&H anticipating surge relief valves are based on the 106-PG or 206-PG main valve.
The valve is mounted in a tee, downstream of the pump check valve(s). It is designed to anticipate surges to avoid the severe water hammer often associated with power failure surges.
The RPS-L&H pilot system is comprised of two pilots, the 81-RP and the 82-PR. Both pilots sense pressure through a connection to the header pipe. The 81-RP high pressure pilot opens the valve to relieve excess pressure. The model 82-PR low pressure pilot opens quickly on below normal pressures prior to the return of a surge wave, initiating the opening of the main valve in anticipation of the high pressure wave’s arrival.
Pressure Differential Sustaining Valve
The 106-RPS-D and 206-RPS-D pressure differential sustaining valves are based on the 106-PG or 06-PG main valve.
The RPS-D uses the 81-RPD pilot valve and has two sensing connections. The valve and pilot remain closed until the difference between the two pressures exceeds the pilot setting. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm. The pilot setting establishes a differential pressure that is held relatively steady despite changes in system pressure or flow.