Servo-Proportional Valves Series D661 Servo-Proportional Valves Series D662 Servo-Proportional Valves Series D663 Servo-Proportional Valves Series D664 Servo-Proportional Valves Series D665 with integrated electronics A significant increase in the useable flow yield (> 90% of the control flow) helps to save energy, particularly in machines with several valves. High dynamics due to high intrinsic frequency (500Hz) of the servo jet pilot stage. Reliable function. The high pressure yield of the ServoJet pilot stage (to 80% Δp at100% input signal) enables high actuating forces for the long-stroke control spools and thus ensures that it also reliably assumes its pre-specified position against pollution and current forces. MOOG D662 moog d662 valve moog d662 pdf moog ventil d662 moog proportionalventil d662 moog servoventil d662 moog servo valve d661 moog servo valve null adjustment moog servo valve 072