Moog 31 Cross Reference Electro-Hydraulic Flow Control Servo Valve
Model NO.: 31
Trademark: WK
Specification: Standard
Origin: China
HS Code: 84818010
Model NO.: 31
Trademark: WK
Specification: Standard
Origin: China
HS Code: 84818010
 Performance indicesÂ
| Item | Unit | Index | |
| Supply pressure Ps | MPa | 2~25 | |
| Rated supply pressure Pn | MPa | 21 | |
| Rated flow Qn () | L/min | 20 | |
| Rated current In | mA | 40 | |
| Hysteresis | % | ≤4 | |
| Threshold | % | ≤0.5 | |
| Nonlinearity | % | ≤±5 | |
| Unsymmetry | % | ≤±5 | |
| Pressure gain | % | >30 | |
| Internal leakage | L/min | ≤2.0 | |
| Null bias | % | ≤±1 | |
| Null shift with temperature (ΔT=56ºC) | % | ≤±2 | |
|
Null shift with supply pressure of  (80~110%) Pn |
% | ≤±2 | |
|
Null shift with return pressure of  (0~20%) Pn |
% | ≤±2 | |
|
Frequency response |
Amplitude ratio with (-3dB) | Hz | ≥100 |
| Phase lag with (-90°) | Hz | ≥100 | |
| Working temperature | ºC | -15~100 | |
| Weight | kg | ≈0.4 | |
Electrical interface
Â
| Item | Unit | Single coil | Parallel coil | Series coil |
| Coil resistance | Ω | 100 | 50 | 200 |
| Rated current | mA | 40 | 40 | 20 |
| Coil inductance | H | 1 | 0.5 | 2 |
Overall and installation dimensions
Overall dimensions
Installation dimensions
*Requirement: Flatness less than 0.01mm, roughness below .
| 0 | P | A | B | T | G | F1 | F2 | F3 | F4 |
|  | Ф5 | Ф5 | Ф5 | Ф5 | ф3 | M4 | M4 | M4 | M4 |
| X | 22 | 14 | 30 | 22 | 32 | 0 | 44 | 44 | 0 |
| Y | 9 | 17 | 17 | 25 | 29 | 0 | 0 | 34 | 34 |
Comparison between Servo Valve Model and Moog Model
                                   Â
| WK Â Â Â Model | MOOGÂ Â Â Model |
| SFL218Â Â Â Â Series | MOOG 760/761Â Series |
| SFL218AÂ Â Â Â Â Â Series | MOOG G631Â Â Â Â Series |
| SFL218BÂ Â Â Â Â Â Series | MOOG062Â Â Â Â Series (PLASSER) |
| SFL214,216Â Â Series | MOOG 072Â Â Â Â Â Â Series |
| SFL212AÂ Â Â Â Â Â Series | MOOG 30Â Â Â Â Series |
| SFL212/BÂ Â Â Â Â Series | MOOG 31Â Â Â Â Series |
| SFZ141Â Â Â Â Â Series | MOOG D633Â Â Â Â Series |
| SFZ142Â Â Â Â Â Series | MOOG D634Â Â Â Â Series |
| SFL317Â Â Â Â Series | MOOG792Â Â Â Â Series |
| SFL316Â Â Â Â Series | MOOG791Â Â Â Â Series |
| SFD234Â Â Â Â Series | MOOG D661Â Â Â Â Series |
Certificate test
  Performance indices
Â
| Item | Unit | Index | |
| Supply pressure Ps | MPa | 2~25 | |
| Rated supply pressure Pn | MPa | 21 | |
| Rated flow Qn () | L/min | 20 | |
| Rated current In | mA | 40 | |
| Hysteresis | % | ≤4 | |
| Threshold | % | ≤0.5 | |
| Nonlinearity | % | ≤±5 | |
| Unsymmetry | % | ≤±5 | |
| Pressure gain | % | >30 | |
| Internal leakage | L/min | ≤2.0 | |
| Null bias | % | ≤±1 | |
| Null shift with temperature (ΔT=56ºC) | % | ≤±2 | |
|
Null shift with supply pressure of  (80~110%) Pn |
% | ≤±2 | |
|
Null shift with return pressure of  (0~20%) Pn |
% | ≤±2 | |
|
Frequency response |
Amplitude ratio with (-3dB) | Hz | ≥100 |
| Phase lag with (-90°) | Hz | ≥100 | |
| Working temperature | ºC | -15~100 | |
| Weight | kg | ≈0.4 | |
Electrical interface
Â
| Item | Unit | Single coil | Parallel coil | Series coil |
| Coil resistance | Ω | 100 | 50 | 200 |
| Rated current | mA | 40 | 40 | 20 |
| Coil inductance | H | 1 | 0.5 | 2 |
Overall and installation dimensions
Overall dimensions
Installation dimensions
*Requirement: Flatness less than 0.01mm, roughness below .
| 0 | P | A | B | T | G | F1 | F2 | F3 | F4 |
|  | Ф5 | Ф5 | Ф5 | Ф5 | ф3 | M4 | M4 | M4 | M4 |
| X | 22 | 14 | 30 | 22 | 32 | 0 | 44 | 44 | 0 |
| Y | 9 | 17 | 17 | 25 | 29 | 0 | 0 | 34 | 34 |
Comparison between Servo Valve Model and Moog Model
                                   Â
| WK Â Â Â Model | MOOGÂ Â Â Model |
| SFL218Â Â Â Â Series | MOOG 760/761Â Series |
| SFL218AÂ Â Â Â Â Â Series | MOOG G631Â Â Â Â Series |
| SFL218BÂ Â Â Â Â Â Series | MOOG062Â Â Â Â Series (PLASSER) |
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