Electro-hydraulic Valves - A Technical Look

WHAT MOVES YOUR WORLDELECTRO-HYDRAULIC Valves A Technical LOOK2 MOOG VALVE TYPES EXPLAINEDMoog Electro-hydraulic Valves Whenever the highest levels of motion control performance and design flexibility are required, you ll find Moog expertise at is a registered trademark of Moog Inc. and its subsidiaries. All trademarks as indicated herein are the property of Moog Inc. and its subsidiaries. For the full disclaimer refer to the most current information, visit or contact your local Moog ..2 About Moog, Applications, Assistance ..3 MOOG VALVE TYPES EXPLAINED ..5-9 servo and Proportional Valves ..5 Directly and Pilot Operated Valves ..6 Electrical and Mechanical Feedback Valves ..7 EFB Valves with Analog or Digital Electronics ..8 Pressure and Flow Control and Axis Control Valves ..9 OPERATING PRINCIPLES.

a servo and a proportional valve is the spool overlap in the center position. While a servo valve has a spool overlap of <3% of the spool stroke, a proportional valve has an overlap of 3% or more (as defined in ISO 5598). This usually leads to servo valves being built with a spool that is sliding inside a hardened steel bushing, while propor-

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