AUKOR Electro-hydraulic Servo Valve Test Bench

Function: Through this test bench, the collection, processing, management of static and dynamic

data of electro-hydraulic servo valves can be realized, and the pressure loss curve,

internal leakage curve, safety valve pressure characteristic curve and directional valve

micro-motion characteristic curve can be printed.

Test Projects

Test Projects:

Static characteristic test includes below items:

1: Withstand test

2: Pressure pulse test

3: Load flow characteristics

4: No-load flow characteristic

5: Pressure gain characteristics

6: Internal leakage characteristics

7: Durability

8: Resolution

9: Anti-pollution capabilities

10: Environmental testing, etc.

2. Dynamic characteristic test:

1: Frequency response

2: Transient performance

Performance Parameters:

Meet Standards:GB/T15623

Total Power:55KW, 75KW, 90KW, 132KW, 160KW

Test Pressure Range:0 ... 31.5MPa

Return Oil Port Pressure:<3% of rated pressure

Pressure Pulsation of Oil Source: <2.5% of the rated pressure.

Hysteresis: <0.5% of the rated pressure output

Repeatability: <0.5% of the rated pressure output

Rotational Speed Range: 0 ... 3000r/min

Flow Rate Range: 0 ... 1000L/min

Hydraulic Oil Type: Aviation hydraulic oil or other types of hydraulic oil

Viscosity Grade: The kinematic viscosity is 17-43 mm²/s at 50℃

Hydraulic Oil Cleanliness Grade: ISO4406 13/10 - 17/14

Operating Ambient Temperature: -10 - 60℃

Temperature Drift: < ±0.05%

Sensitivity Temperature Drift: < ±0.05%/℃

Initial Bridge Unbalance: < ±0.5% of the rated pressure output

Bridge Impedance: 350Ω

Overload Capacity: 150% F.-S.

System Temperature Control Mode: Water cooling, Electricity cooling, Freezer cooling

The electro-hydraulic servo valves testing

Testing Explanation

No-load Flow Characteristics:When the load pressure difference is zero, the input current changes for one working cycle, test the change of no-load flow, draw the

no-load flow curve, and calculate the rated flow, flow gain, hysteresis, zero offset, linearity, symmetry, etc..

Resolution Test:When the load pressure difference is zero, the input current changes slowly within 10% of the rated current. Test the minimum current

required for the flow to change from the increasing state to decreasing state (or from the decreasing state to the increasing state), and calculate the resolution index.

Pressure Gain Characteristic:When the output flow is zero, the input current changes cyclically within 50% of the rated current, test the relationship between the load

pressure and the current, calculate the pressure gain value.

Internal Leakage: When the output flow is zero, the input current changes for one working cycle,test the relationship between the leakage at the oil return port and the current, and calculate the maximum leakage.

Frequency response: The sine sweep method is adopted. The frequency of the excitation signal changes sequentially from small to large (or from large to

small). Test the variation characteristics of the amplitude ratio and phase difference of the input and output signals of the servo valve with the excitation frequency,draw the amplitude-frequency characteristic curve and phase-frequency characteristic curve,and calculate the amplitude-frequency bandwidth (-3db) and phase-frequency bandwidth (-45°).