The minimum flow valves from our SIP series is the ideal valve for applications with pressures between 140 and 250 bar in systems with continuous operation, even at load points below the pump minimum quantity. The SIP controls the bypass by means of a multi-stage piston, which enables a defined multi-stage pressure reduction for all flow rates and also guarantees cavitation-free operation at all times. The piston of the SIP is actuated directly by the plug via a lever; the pressure is balanced to reduce the actuating forces. By means of pressure compensation, the actuating forces are reduced to such an extent that a pilot system (as with the SMA /SHP high-pressure series) is not required. With its properties, the SIP is particularly suitable for the protection of boiler feed pumps in combined cycle power plants (CCPP).