Hydraulic servo-valve 

Hydraulic servo-valve
Part Number: 
350 bar | SX4
Eaton's Vickers SX4 two-stage, four-way, flapper nozzle servo valves provide closed loop control with exact positional accuracy, repeatable velocity, and predictable force and torque regulation. SX4 servo valves offer extended frequency response for more demanding close loop applications compared to Vickers SM4 servo valves. 
The wide range of sizes allows best suitability for application
Jeweled feedback ball receiver virtually eliminates the wear
Jeweled orifices greatly extend the life
Highly accurate control profiles
Integral filter provides extra contamination protection
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