A direct-acting, normally closed control proportional valve family is being piloted from Comatrol. The updated valves build from the company’s experience with both proportional relief valves and fan drive control and are available in a 350-bar (5075-psi) high pressure HPRV08-DAC version and 210-bar (3045-bar) standard pressure PRV08-DAC version, with flows of 1.2 L/min (0.32 gal/min) and 2.1 L/min (0.55 gal/min), respectively. The valves are suitable for piloting fan drive systems where pressure control is the optimum solution. Type HPRV08-DAC and PRV08-DAC valves can be combined with a logic element, such as the HLE10-CVO, to create a high-flow, high-pressure proportional relief valve.