Siemens has extended its proven Acvatix range by the introduction of a new range of pressure-independent control combi valves, types VPP46 and VPI46 to complement the existing VPI45 range. These have a control valve for temperature control, a differential-pressure controller for balancing pressure fluctuations in the hydraulic system, a facility for pre-adjusting the required flow rate, and pressure test points for measuring the differential pressure — all integrated in one valve body. They reduce planning, installation and commissioning costs, and increase the control accuracy under all operating conditions, leading to increased energy efficient operation.