ENGINEERING & DESIGN
System Check
Command voltage/current, electrical power supply, LVDT feedback signal, and hydraulic pilot pressure are evaluated.
FLOWART // PROPORTIONAL & SERVO VALVE TEST
Proportional & Servo Valve Repair & Bench Testing
Proportional valve glitches are rarely purely mechanical. Driver card command signals, onboard electronics (OBE), LVDT feedback, fluid cleanliness, and spool wear are examined together.
0-10V / 4-20mA
Signal Response & Hysteresis Profiling
LVDT Calibration
Sub-Micron Spool-Sleeve Alignment
Functional Test
Factory Output Dynamic Baseline
FLOWART // ENGINEERING SCOPE
Scope of Service & Application Details
Precision overhaul of proportional and servo valves featuring spool-sleeve micro-clearance measurement, LVDT sensor calibration, and electronics testing.
● LVDT CALIBRATION● SPOOL-SLEEVE HONING● ON-BOARD ELECTRONICS● HYSTERESIS TEST
Model code & electronics check
Driver card & command signal test
Fluid contamination assessment
Mechanical-hydraulic teardown
Seal replacement & spool cleaning
Bench flow & response calibration
SYSTEMATIC WORKFLOW
Implementation Methodology & Engineering Steps
Controlled engineering process from initial calculation and modeling to machining, dynamic pressure testing, and commissioning.
FABRICATION & MACHINING
Valve Teardown
Ultrasonic cleaning, spool-sleeve clearance measurement, solenoid coil testing, and seal kit replacement.
TESTING & VERIFICATION
Bench Calibration
Hysteresis, zero-point offset, frequency response, internal leakage, and step response are verified on automated test rigs.
Technical Data & Standards
Uluslararası endüstriyel standartlar (ISO 4413 / DIN), malzeme toleransları ve saha doğrulama gereksinimleri.
TECHNICAL VERIFICATION & DATA SPECIFICATIONS
ISO COMPLIANT
Positional error, oscillation, delayed response, zero-point drift, irregular speed
Command signal, power supply, spool movement, internal bypass, oil cleanliness
Rebuilt valve, calibration test sheet, zero-point adjustment report
Frequently Asked Questions
Unstable command signals, fluid contamination sticking the spool, improper gain settings, or pressure fluctuations cause humming.
If contamination is minor, ultrasonic cleaning may resolve it; however, worn spool-sleeve clearances require lapping and recalibration.
Yes. We test onboard electronics (OBE) or external driver cards alongside the valve to ensure total system compatibility.
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Combined mechanical, hydraulic, and electronic diagnostic testing, spool lapping, seal renewal, and response calibration.
Information for technical assessment
- Component model, nameplate and photos
- Application, operating conditions and fault symptoms
- Available drawings, measurements and maintenance records
- Site location, access and delivery requirements
Service Areas
Sakarya, Kocaeli, İstanbul, Düzce, Bolu, Ankara, Bursa, Yalova.
Site visits depend on scope, safe access and team availability. Component shipping, delivery timing and testing requirements are agreed during quotation.
Explore service coverage and working arrangements →Related technical guides
- Hydraulic Circuit Diagram & Schematic Reading Guide | ISO 1219 Symbols
- Oil Contamination & Hydraulic Filtration Standards
FLOWART ENGINEERING
Submit Your Engineering & Service Request
Contact our engineering team directly for your projects, overhaul needs, and hydraulic troubleshooting.