Products Description
The FF-791 series electro-hydraulic servo valve is an electric feedback three-stage nozzle baffle high flow servo valve, with a flow rate of 100L/min under a pressure difference of 7MPa 160L/min and 250L/min. This type of servo valve uses a two-stage dual nozzle baffle servo valve as the pilot valve, with fast response and high dynamic performance. 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 two-stage jet tube high flow servo valves, its dynamic response is higher. This series of three-stage servo valves features both high flow rate and high dynamic response. The internal and external oil supply of the pilot stage is available for selection, and the control box is designed with an external electrical zero position adjustment device for more convenient use. At the same time, according to the requirements, the safety position of the valve core can be customized after power-off and pressure interruption.
Product Features:
●Internal integrated controller, combined with LVDT and other components to form an electro-hydraulic servo valve
internal closed-loop control
Technical Parameter：
Item | Unit Of Measurement |
FF-791 Series | ||
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 | 100 | 160 | 250 |
gpm | 26.4 | 42.2 | 66 | |
Hysteresis Loop | % | ≤0.5 | ||
Resolution Ratio | % | ≤0.2 | ||
Nonlinearity | % | ≤7.5 | ||
Asymmetric Degree | % | ≤10 | ||
Pressure Gain | % | ≥30 | ||
Internal Leakage | L/min | ≤5 | ≤7 | ≤10 |
gpm | ≤1.32 | ≤1.85 | ≤2.64 | |
Null Bias | % | ≤±3 | ||
Overlap | % | ≤±2.5 | ||
Null Shift With Temperature (Temperature Changes By 55 ℃ Every Time) |
% |
≤±4 | ||
Step Response |
ms | 3～10 | ||
Spool Displacement | mm | 1.4 | 1.2 | 2.0 |
Valve Core Driving Area | cm² | 2.85 | ||
Pilot Stage Flow Rate △PN=21MPa | L/min | 16.5 | ||
gpm | 4.36 | |||
Net Weight | kg | 13 | ||
Applications:
