Moog Servo Valve with 25mm-45mm Shaft Diameter Electro-hydraulic Control and Hydraulic Oil Fuel for Precision Flow Regulation

• D761-2612/D791-5009 H19J0GBEVAL
• D761-2619/D791-4028 H10J0GAEVAL
• D061-8411/D662-4010 J15HOBA4VB1
• D061-8412/D663-4007 J15HOBB4VB1
• G761-3002

• Original MOOG D633-7205
• Original MOOG D633-7320
• Original MOOG D633-7368
• Original MOOG D633-7369
• Original MOOG D633E714
• Original MOOG D633E714A
• Original MOOG D634-318C
• Original MOOG D634-319C
• Original MOOG D634-341C
• Original MOOG D634-501A
• Original MOOG D634-514A
• Original MOOG D634-E301B
• Original MOOG D634E301B
• Original MOOG D634E319B
• Original MOOG D634E356B
• Original MOOG D634Z510
• Original MOOG D635K2009E
• Original MOOG D638E120
• Original MOOG D638E126
• Original MOOG D641-163A
• Original MOOG D641-194
• Original MOOG D641-219
• Original MOOG D641-351
• Original MOOG D641-363
• Original MOOG D642-284
• Original MOOG D642-308
• Original MOOG D642-505
• Original MOOG D642-515A
• Original MOOG D643-101
• Original MOOG D643-319
• Original MOOG D643-504
• Original MOOG D643-508A
• Original MOOG D644-308
• Original MOOG D644-319
• Original MOOG D644-519
• Original MOOG D645-305
• Original MOOG D645-403
• Original MOOG D648-129
• Original MOOG D651-129
• Original MOOG D651-129B
• Original MOOG D651-129D
• Original MOOG D651-346A
• Original MOOG D651-347B
• Original MOOG D651-413
• Original MOOG D651-413D-4
• Original MOOG D651-416D-4
• Original MOOG D651-461D
• Original MOOG D651-471
• Original MOOG D651-471D
• Original MOOG D653-2709E
• Original MOOG D656Z130
• Original MOOG D661 UNIDENTIFIED
• Original MOOG D661-1062E
• Original MOOG D661-1718
• Original MOOG D661-1962E
• Original MOOG D661-2057
• Original MOOG D661-205A
• Original MOOG D661-318A
• Original MOOG D661-363
• Original MOOG D661-363A
• Original MOOG D661-363D

An electrohydraulic servo valve is a precision component that acts as an interface between the electrical control system and the hydraulic power system. It receives a low-power electrical analog signal and converts it into a proportional, high-power hydraulic output (flow and pressure).

A Moog servo valve typically consists of a polarized electrical torque motor and a two-stage hydraulic amplifier:

• First Stage: The torque motor deflects an armature and a flapper attached to it. This flapper moves between two nozzles, creating variable orifices that control the pressure on either end of the second-stage spool.
• Second Stage: The differential pressure moves the spool, which then controls the flow of hydraulic fluid to the actuator. A feedback spring creates a force that balances the input signal torque, ensuring precise spool positioning proportional to the electrical command.

• Filtration: Install a precision filter with a rating of 5 microns or less upstream of the servo valve.
• System Flushing: The entire hydraulic system must be thoroughly flushed before installing the servo valve.
• Mounting: The valve can be mounted in any orientation, ensuring port alignments match the manifold.
• Connections: Use O-ring seal connections and avoid welded fittings.