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Servo Hydraulics

Servo Hydraulics are fluid based systems which use electronic controls to manipulate hydraulic pumps and valves and use feedback devices to correct itself. Hydraulic systems are notoriously hard to control for extremely fine manipulations. Using electronic sensors and modern valve control systems they can be utilized to bring the strength of hydraulics to machinery that needs fine control oversight.

These feedback mechanisms are normally some type of encoder or resolver, or pressure sensors in hydraulic systems.

How servo hydraulic amplifiers work

Linear amplifier - Curtiss-Wright Antriebstechnik - LVN - LVK - LVH - LVC

There are three main components of the linear amplifier: the pilot motor (normally a stepper motor however could be a DC motor or AC servo motor); the NC-valve; and the hydraulic cylinder.

A flexible coupling is fitted between the pilot motor shaft and the control shaft exiting the NC-valve. At the other end of the control shaft is a thread which enables the movement of the control shaft into/out of the NC Valve. A spool is fitted to the control shaft which is kept in location by a spring inside the spool and around the control shaft. This spring positively locates the spool against a thrust washer at the threaded end of the control shaft.

The rotation of the pilot motor is converted into a linear movement of the spool within the NC-valve using the control thread on the control shaft. As the spool moves either the 'tank' or the 'pressure' ports are opened up. The flow of hydraulic medium is controlled into/out of both the piston area and piston ring area.

The closed-loop within the linear amplifier is achieved mechanically via a feedback spindle located within the piston. Located at the NC-valve end of the feedback spindle is a bush. The feedback spindle (which has an opposite thread to the control shaft) thread rotates in the same direction to the pilot motor input due to the resulting movement of the piston. This rotation moves the spool to it's neutral position. When in the neutral position the piston will once again be stationary.

Linear amplifiers - component parts

 

Below are some Manufacturers of servo hydraulic systems. If you do not see yours listed, call us. We can still help you.

Abex Denison FORD PARKER PNEUMATIC DIV
AIPHONE FRAM PARKER SCHRADER BELLOWS
AIR DRO GENERAL ELECTRIC PARKER TELEMECANIQUE
AIR HYDRO POWER INC GENERIC AUTOMATION Parker-Servo Valves
AIR LIQUIDE GENERIC VALVE Pegasus-Servo Valves
ALLENAIR GIRLING PENINSULAR CYLINDER CO
AMC GOULD WATERMAN PENN BASO
AMERICAN CYLINDERS GRACO PHD INC
ARO GRAINGER PNEUMATIC DIVISION
ARO FLUID POWER GREER ACCUMULATORS PNEUMATICS
AROFLEX HALDEX BARNES HYDRAULICS Poclain
ATCHLEY HAMAC POWERS PROCESS CNTRLS
ATCHLEY CONTROLS HANNIFIN PRINCE
Atchley-Servo Valves HARNISCHFEGER RACINE
ATOS HARTNESS INTL REGO
Atos-Servo Valves HASKEL Republic
AURORA AIR PRODUCTS HAUNI REXROTH
BARBER COLMAN HAWE HYDRAULIK Rexroth-pumps & motors
BELLOWS HEB HYDRAULIK Rexroth-Servo Valves
BERINGER HENNELLS RIMA
BETTIS HOERBIGER ORIGA ROHM
BIJUR LUBRICATING CORP HONEYWELL ROSS
BIMBA HONEYWELL SSEC Ross / Parker
Bobcat-pumps & motors only HPI INC RUCKE
BOSCH HUMPHREY SAUER DANFOSS
BOSCH HYDRAULIC HUNKAR LABS Sauer Sundstrand
BOSCH REXROTH HYDAC SCHELLENBERG
Bosch-pumps & motors HYDRALIGN Schenck Pegasus-Servo Valves
Bosch-Servo Valves HYDRAULIC ACCUMULATOR DIVISION SCHRADER BELLOWS
Brand HYDRAULIC VALVE DIVISION SCOVILL
BRASS PRODUCTS DIVISION HYDRO LINE SEALED UNIT PARTS
BROWN & SHARPE HYTEC SERVTEK
BURGMASTER HYTEK SHEFFER
Calzoni INGERSOLL RAND SHIMIZU KIDEN
Casappa-pumps & motors INTERNATIONAL FLUID POWER SHOKU HERION
Caterpillar-pumps & motors only ITT SIEMENS
CESSNA IVERSEN SIEMENS BUILDING TECHNOLOGIES
Chal-Flow JERGENS SIEMENS MOORE
Char-lynn / Eaton JOHN BARNES SIGPACK
Chelsea JOHNSON CONTROLS SITEMA
CIRCLE SEAL VALVE LEHIGH FLUID POWER SKIL BOSCH
CKD CORP LIN ACT SKINNER
CLIPPARD LINCOLN AUTOMOTIVE SMC
CM SMILLIE LINDE SNAPTITE
Commercial / Parker LYNAIR SOUTH BEND CONTROLS
Commercial Scheering MAC VALVES INC SPEEDAIRE
Commerical Intertech MACMILLIN HYDRAULIC SPERRY VICKERS
COMPACT CONTROLS MACO SPORLAN
Continental MAGNATROL STABILUS
CONTINENTAL HYDRAULICS MAGNET SCHULTZ Staffa
CROSS MAIER STERL TRONIC
CTC CORPORATION MANNESMANN REXROTH STERLCO
CTC PARKER AUTOMATION MCC POWERS STERLING INC
CUNNINGHAM MFG MEAD STILL
Custom Hoist MEAD FLUID DYNAMICS SUN HYDRAULICS
CYLINDER DIVISION MEIWA INDUSTRIES LTD Sundstrand / Sauer Danfoss
CYLINDERS & VALVES INC MIDLAND GRAU SUSPA
Daikin MILLER ELECTRIC SWAGELOK
DAMAN MANIFOLDS MILLER FLUID POWER Teledyne
DAMAN PRODUCTS MILLER WELDER PARTS Teledyne Republic
DANFOSS MILWAUKEE CYLINDER TELEMECANIQUE PNEUMATICS
DAYTON MONARCH HYDRAULICS TOKIMEC
DE STA CO TOOLS MOOG TOKYO KEIKI
DELTROL CORP MOORE PRODUCTS TOL O MATIC
DELTROL CORP VALVES MOSIER NORGREN TOMKIN JOHNSON
DELTROL FLUID PRODUCTS MOTION INDUSTRIES TOOL O MATIC
Denison NATIONAL INSTRUMENT TOWA SEIKI
DEPENDABLE DISTRIBUTORS NEUMATICS TRD CYLINDERS
DESTACO NIBCO TRW/Ross
DOUBLE A NISSEI KOUKI Tyrone
Dowty-Gear Pumps NOK Uchida
DUPLOMATIC NORGREN VEKTEK
Dynapower NORTHERN IND TOOLS VICKERS
Dynex NUMATICS Vickers / Eaton
DYNEX RIVETT NUPRO CO VIDEO JET
Dynex/Rivett OBARA CORP VIDEOJET TECHNOLOGIES INC
EATON CORPORATION ORIGA Volvo / Parker
EEC AEG ORTMAN FLUID WALTER PNEUMATIK
ENERAC P&H HARNISCHFEGER WATTS
ENERGY VALVES PARKER WATTS FLUIDAIR
ENERPAC PARKER AUTOMATION WATTS REGULATOR
ERMANCO PARKER BRASS PRODUCTS DIV Webster
EXCELON PARKER FLUID CONNECTORS White
FABCO PARKER FLUID POWER WILLY VOGEL
FABCO-AIR INC PARKER GREER ACCUMULATORS YARWAY
FESTO ELECTRIC PARKER HANNIFIN YUKEN
FLUID POWER DIVISION PARKER HYDRAULIC VALVE DIV Yuken-Servo Valves
FLUTEC PARKER LIN ACT DIV

 

 


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The designated brand names and trademarks described on this website are the property of their respective owners.


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