Singer Valve added an Anticipating Surge Relief feature to its Pneumatic Dynamic Lifter Valve for sewage, dirty and raw water applications. The valve is a responsive compact sewage relief valve that can handle high pressures and uses a compressed-air cylinder to hold the valve closed. This chamber is fitted with a relief pilot that is normally closed as long as the line pressure is lower than the set point. If pressure rises above the set point, the relief pilot opens, causing the air in the cylinder to vent, which in turn opens the valve. The valve closes drip tight when pressure falls below the set point Singer Valve also has a patented spring-loaded version, which is used for lower relief pressure systems and does not have the Surge Anticipator option, but is more economical. The Surge Anticipator employs two three-way solenoid valves to put air into the cylinder under the piston, driving the valve open on power failure. This way when the surge returns back to the pump, it is not coming back to a closed system where it can cause damage; it comes back to an open valve where it can be discharged safely back to the sump in the vicinity of the pump.