Proportional valve with direct drive closed-loop pilot valve

Moog’s D680 series proportional valves are throttle valves for 2-, 3-, 4- and 5- way applications, suitable for electrohydraulic position, velocity, flow and force control in hydraulic systems. The D680 product range has integrated electronics, and is suitable for applications with high dynamic response requirements.

The newly launched version is a two-stage valve with a closed loop controlled D633 direct drive servo valve as the pilot stage. More robust than the existing version, it is suitable for use in the most demanding environments.

The D633 direct drive servo valve pilot stage with open loop control has been available for many years. Moog developed the new version in conjunction with machine builders in the plastics metal forming, presses and steel production sectors.

The new pilot stage option is suitable for applications requiring high dynamic performance, where longer service life and energy efficiency are critical.

Moog D680 series proportional valves are said to provide reliable control for machinery in industries such as injection and blow molding, die-casting, steel production, metal forming and presses and lumber processing. The range can be integrated easily into new designs, and configured to meet the exact application and performance requirements of industrial machinery and equipment.

The latest D680 proportional valve design is said to offer the benefit of a long service life and significant energy savings.

Dr. Marco Wiegandt, Moog valve development engineering manager comments: "Our customers in the injection molding, die casting and metal forming and press markets trust the performance and reliability of Moog’s Servo valve products. Some of our lead customers have enjoyed greater repeatability and a long service life by using this energy-efficient, robust design.

"In machine applications where high accuracy and repeatability are required, the new D680 Series Proportional Valve with a closed loop D633 pilot valve is an excellent choice."