Products Description
The FF-638M series electro-hydraulic servo valve is a linear direct drive flow servo proportional valve with a flow range of 50L/min and 100L/min under a pressure difference of 7MPa. This type of servo valve is directly driven by a proportional solenoid, without a pilot stage or internal throttling holes, resulting in low leakage, low hydraulic power consumption, strong anti pollution ability, and minimal impact on valve dynamics due to reduced system oil supply pressure. The LVDT valve core position sensor is used internally for position closed-loop control, resulting in small hysteresis, high resolution, and good repeatability accuracy. Compared to general servo valves, this series of products has multiple power-off safety position functions to choose from, which can keep the system in a set safe state after unexpected power failure. The control box is designed with an external electrical zero adjustment device, making it more convenient to use. It is widely used in heavy machinery, steel, metallurgical industries, as well as blowing and injection molding machines.
Product Features :
● No pilot stage leakage, low leakage
● High structural strength
Technical Parameter:
Item
| Unit Of Measurement |
FF-638M
| ||||||||
| Oil Supply Pressure Range | MPa | ≤31.5 | ||||||||
Rate Supply Pressure Ps | MPa | 21 | ||||||||
bar | 210 | |||||||||
psi | 3050 | |||||||||
Rate Flow Qn(±10%) △PN=7MPa |
L/min | L | D | T | DT | |||||
50 | 100 | 50 | 100 | 50 | 100 | 50 | 100 | |||
gpm | 13.21 | 26.42 | 13.21 | 26.42 | 13.21 | 26.42 | 13.21 | 26.42 | ||
Hysteresis Loop | % | ≤0.5 | ||||||||
Resolution Ratio | % | ≤0.1 | ||||||||
Linearity | % | ≤7.5 | ||||||||
Symmetry | % | ≤10 | ||||||||
Pressure Gain | % | ≥40 | ||||||||
Internal Leakage | L/min | ≤1.2 | ||||||||
gpm | 0.24 | |||||||||
Null Bias | % | ≤±2 | ||||||||
Overlap | % | ≤2.5 | ||||||||
Null Shift With Temperature (Temperature Changes By 540℃ Every Time) |
% |
≤1 | ||||||||
Frequency Response | Amplitude Bandwidth (-3dB) | Hz | ≥50 | |||||||
Phase Bandwidth (-90°) | Hz | ≥50 | ||||||||
Step Response |
ms | ≤12 | ||||||||
Net Weight | kg | 6.2 | ||||||||
Applications:
