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The J761-003A Servo Valve is specifically designed for the EH oil system of steam turbines to supply oil to the actuator of the safety regulation system, ensuring its normal operation. Due to the high pressure of the EH oil, small clearances in the hydraulic moving parts, and a servo valve clearance of 5 to 10 micrometers, it is essential to ensure that the oil particle size meets the specified SAE 2 or NAS 5 level before proceeding to the next stage of the debugging process.
Structure:
The J761-003A flow control servovalves are designed to provide high-performance control for electrohydraulic systems. The valve consists of a closed center, four-way sliding spool as its output stage, ensuring precise control and efficient operation. The pilot stage features a symmetrical double-nozzle and flapper, driven by a double air gap, dry torque motor. To provide accurate spool position feedback, a cantilever spring is used in the mechanical feedback system.
The J761-003A Servo Valve stands out with its simple and rugged design, ensuring dependable and long-lasting performance. The design incorporates a carbide-tipped feedback wire, controlled by a carbide ball at its end, which is a mandatory requirement to ensure high accuracy, reliable operation, and extended service life.
| Technical Specification of Servo Valve for Reference | |
| Valve Type | SM4 series Electro hydraulic servo valve |
| Connection | Aviation plug |
| Material | Stainless steel |
| Maximum Rated Flow | 76l/min |
| Maximum Total Null Leakage | 2l/min |
| Maximum Pilot Flow | 0.35l/min |
| Maximum Supply Pressure | 210bar |
| Minimum Supply Pressure | 14bar |
| Proof Pressure | 150% At Supply Port |
| Burst Pressure Return Port Open | 250% |
| Maximum Operating Temperature | 135°C |
| Hysteresis Around Null | ≤3% |
| Symmetry Error | <10% |
| Linearity Error | <10% |
| Threshold | ≤0.5% |
| Condition | Brand-New |
| After-service | Cleaning and testing |
Yoyik offers different types of Hydraulic solenoid valves for industrial users:
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IGV SERVO VALVE ELECTRO HYDRAULIC FLOW CONTROL G771K202
Moog valve 0508.2303T0102.AW009
Servo valve SM4-20(15)-80/40-10-S182
Servo valve J761-003
Servo valve G761-3005
Servo valve 0508.902T0102.AW018
servo valve SM4-20(15)57-80/40-10-H607
DDV Valve for Turbine HPCV TYV4-06
servo valve SM4-20
Servo valve SM4-40(40)151-80/40-10-S205
servo valve 072-120-10
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