【精品】eton伺服阀原理（可编辑.ppt

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1、ETON伺服阀原理Servo Valve FeaturesReliable flapper nozzle design2 Stage operation w/mechanical feedbackWide range of coils to meet competitionJeweled orificesJeweled 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 con

2、figurationsIndustry standard mounting patternsFiltered pilot stage flowExternal pilot capabilitiesPressures to 5000 PSIBandwidths up to 350 HZ“Intrinsically Safe”CapabilitiesSERVO VALVESERVO VALVESERVO VALVE-BODYSERVO VALVE-BODYConstruction of the servo valve starts with the body.Directional Servo V

3、alvesSERVO VALVE SLEEVESERVO VALVE SLEEVEThe body is fitted with a sleeve in order that the spool lands can be accurately matched to the sleeve ports.SERVO VALVE-PILOT SUPPLYSERVO VALVE-PILOT SUPPLYThe body end-caps are used to connect pilot oil from the filter to the pilot stage of the valve.SERVO

4、VALVE-NOZZLE BLOCKSERVO VALVE-NOZZLE BLOCKSERVO VALVE-PILOT NOZZLESSERVO VALVE-PILOT NOZZLESThe 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 nozzl

5、es and locates in a recess in the main spool.SERVO VALVESERVO 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.SERVO VALVESERVO VALVEThe torque motor is fitted with a

6、 permanent magnet frame surrounding the armature.SERVO VALVESERVO 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.SERVO VALVESERV

7、O VALVEThe tilting of the armature causes the flapper to move closer to one nozzle and further away from the opposite nozzle.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.SERVO VALVESERVO VALVESERVO VALVE PRODUCTSSERVO VALVE PRODUCTS