SERVO VALVE - BODY Construction of the servo valve starts with the body.
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SERVO VALVE - BODYSERVO VALVE - BODY
Construction of the servo valve starts with the body.
Construction of the servo valve starts with the body.
SERVO VALVE SLEEVESERVO VALVE SLEEVE
The body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.
The body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.
SERVO VALVE - SPOOLSERVO VALVE - SPOOL
The body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.
The body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.
SERVO VALVE - PILOT FILTERSERVO VALVE - PILOT FILTER
A filter for the pilot supply is also fitted in the main body.
A filter for the pilot supply is also fitted in the main body.
SERVO VALVE - PILOT SUPPLYSERVO VALVE - PILOT SUPPLY
The body end-caps are used to connect pilot oil from the filter to the pilot stage of the valve.
The body end-caps are used to connect pilot oil from the filter to the pilot stage of the valve.
SERVO VALVE - NOZZLE BLOCKSERVO VALVE - NOZZLE BLOCK
SERVO VALVE - PILOT NOZZLESSERVO VALVE - PILOT NOZZLES
The pilot stage includes two nozzles ...
The pilot stage includes two nozzles ...
SERVO VALVE - TORQUE MOTORSERVO 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.
... 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.
SERVO VALVESERVO VALVE
When 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.
When 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.
SERVO VALVESERVO VALVE
The torque motor is fitted with a permanent magnet frame surrounding the armature.
The torque motor is fitted with a permanent magnet frame surrounding the armature.
SERVO VALVESERVO VALVE
Passing 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.
Passing 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.
SERVO VALVESERVO VALVE
The tilting of the armature causes the flapper to move closer to one nozzle and further away from the opposite nozzle.
The tilting of the armature causes the flapper to move closer to one nozzle and further away from the opposite nozzle.
SERVO VALVESERVO VALVE
This unbalances the pressures on either end of the main spool ...
This unbalances the pressures on either end of the main spool ...
SERVO VALVESERVO 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.
... 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.
SERVO VALVESERVO VALVE
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