nullDirectional Servo ValvesDirectional Servo Valves
SM4-10
SM4-12
SM4-15
SM4-20
SM4-40
SM4-60 New in 2007
SX4-10 thru 20Servo Valve FeaturesServo Valve FeaturesReliable flapper – nozzle design
2 Stage operation w/ mechanical feedback
Wide range of coils to meet competition
Jeweled orifices
Jeweled feedback eliminates spool rotation and “null glitch”.
Flow ranges from <1 GPM to 40 GPM (@ 1000 PSI.)
Custom spools from over lap to under lap configurations
Industry standard mounting patterns
Filtered pilot stage flow
External pilot capabilities
Pressures to 5000 PSI
Bandwidths up to 350 HZ
“Intrinsically Safe” Capabilities
null````SERVO VALVE
Directional Servo ValvesSERVO VALVE - BODYConstruction of the servo valve starts with the body. Directional Servo ValvesnullSERVO VALVE SLEEVEThe body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.nullSERVO VALVE - SPOOLThe body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.nullSERVO VALVE - PILOT FILTERA filter for the pilot supply is also fitted in the main body.nullSERVO VALVE - PILOT SUPPLYThe body end-caps are used to connect pilot oil from the filter to the pilot stage of the valve.nullSERVO VALVE - NOZZLE BLOCKnullSERVO VALVE - PILOT NOZZLESThe pilot stage includes two nozzles ...nullSERVO VALVE - TORQUE MOTOR... and a torque motor. Attached to the torque motor armature is a flapper plate which extends down through the two pilot nozzles and locates in a recess in the main spool.nullSERVO VALVEWhen the valve is de-energised, the flapper is centred relative to the two pilot nozzles so pressures on either end of the main spool are equal and the main spool is also centred.nullSERVO VALVEThe torque motor is fitted with a permanent magnet frame surrounding the armature.nullSERVO VALVEPassing a current through the torque motor coils magentises the armature and causes it to tilt. The direction of the tilt is determined by the voltage polarity and the amount of tilt by the magnitude of the current.nullSERVO VALVEThe tilting of the armature causes the flapper to move closer to one nozzle and further away from the opposite nozzle.nullSERVO VALVE... causing the main spool to move and flow to pass through the valve.
As the main spool moves, the flapper is dragged back to the centre of the two nozzles when the pilot pressures equalise and the spool stops moving.nullSERVO VALVEnullSERVO VALVE PRODUCTS
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