Hydraulic Repair Schematic

Caterpillar Hydraulic

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Category: Hydraulic Proportional

Hydraulic Proportional

Hydraulic Proportional – Servo Solenoid – Pilot Operated

Posted on July 25, 2022

Main stage has proportional spool in cast housing Pilot stage has sleeve/spool (4WRPEH) Nominal Flow rated at 10 bar ?p for pilot operated Servo Solenoid…

Hydraulic Proportional

Hydraulic Proportional – Fuse OBE on Servo Solenoids

Posted on July 25, 2022

Protect each OBE with 2.5 Amp, Fast acting Fuse!  

Hydraulic Proportional

Hydraulic Proportional – Servo Solenoid – Direct Operated

Posted on July 21, 2022

Smooth cross-over (through center) like Servo, important to Most Reliable OBE Available 25g mechanical shock and vibration for 24 hours in 3 Axis Long Service…

Hydraulic Proportional

Hydraulic Proportional – Spool/Sleeve in Direct Operated Servo Solenoid

Posted on July 21, 2022

Zero overlap matched spool and sleeve Failsafe position with overlap, by spring offset during power off / fault), which may eliminate need for an external…

Hydraulic Proportional

Hydraulic Proportional – Nominal Flow Conversion

Posted on July 21, 2022

Easily convert between – Sleeve/Spool rated Nominal Flow @1000 psi ?p – Proportional rated Nominal Flow @ 145 psi ?p • Servo to Proportional nominal…

Hydraulic Proportional

Hydraulic Proportional – Servo Solenoid – Direct Operated

Posted on July 21, 2022July 21, 2022

Very Fast Stroke Solenoid – Directly Positions Spool – No Flapper/Nozzle – No Jet-pipes – No Pilot Leakage Spool and Sleeve Assembly – Zero Overlap…

Hydraulic Proportional

Hydraulic Proportional – Tester for Integrated Electronic Valves

Posted on July 21, 2022

VT-VETSY-1-1X/1-2-1-1-0/USA – R978050422 Includes 24vdc power supply with US power cord, 2 cables for 7-pin, servo adapter, VET tester  

Hydraulic Proportional

Hydraulic Proportional – Bode Diagrams

Posted on July 21, 2022

Valve frequency response @ -3dB amplitude Phase Lag @ -90 degrees  

Hydraulic Proportional

Hydraulic Proportional – Step Response

Posted on July 20, 2022

Time for spool transition given a stepped input Standard test conditions (fluid temp, pressure) may not match your application If only given a time, you…

Hydraulic Proportional

Hydraulic Proportional – Performance Terms

Posted on July 20, 2022

Hysteresis is max. position error which depends on direction history Reversal Error is the smallest signal that moves spool in the opposite direction Response Sensitivity…

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