We are the first private enterprise that is engaged in the design and manufacture of electro-hydraulic servovalve and hydraulic valve in China. At present, its products includes HTPL801, HTPL802, HTPL803 and HTPL808 Double Flapper-Nozzle, Two Stage Electro-Hydraulic Flow Control Servovalves as well as HTS818 Three Stage Electro-Hydraulic Flow Control Servovalve.
The valves above mentioned are applicable for controlling position, velocity, acceleration and force of electro-hydraulic servo control system, which is widely applied to various fields such as metallurgy, light industry and engineering mechanism, machine building, large scale test facility, aerospace, shipping, radar, rtillery and etc. Those valves can replace MOOG series servovalve.
We accept the consultation from different customer , we will supply the best service at every aspects .
We can take the major repairing for you and design the servo valve eplace your previous ones you are using .
HTPL818 electro hydraulic servo valve Technical Data
See Fig.3 for the operating principle of the valve. The valve is composed of electronic controller, two stage double-nozzle force feedback electro-hydraulic flow control servovalve which is regarded as a pilot valve, and the third stage up rated spool type control valve. There is a displacement transducer at one end of the third stage spool. The displacement of spool is fed back to the input end of electronic controller by way of electric feedback to make of closed position loop. Send an electric signal to the valve, resulting in a corresponding displacement exported by the third stage spool, and a flow rate exported by the third stage valve. The output flow of valve is proportional to the input current signal when the load pressure is at fixed value.
SERVOVALVE SPECIFICATION
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ITEMS
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SPEC.LIMITS
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REMARKS
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Rated Flow
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380L/min+10%
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@7MPa Pressure drop/Land
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Rated Pressure
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30.9 MPa
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Proof Pressure
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52.5 MPa
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Test Pressure 31.5MPa
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Back Pressure
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21 MPa
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Rated Signal
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±10 V
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Spool Stroke
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±1.5 mm
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Lap Condition
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1% Over Lap
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0.5% Over Lap/Land
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Null Bias(Test Press.30.9MPa)
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≤±1.0%
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Percent of Rated Input
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Hysteresis (Test Press.30.9MPa)
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≤0.5%
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Threshold (Test Press.30.9MPa)
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≤0.25%
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Pressure Center Shift
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≤1.25%
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@3.5MPa change in pilot supply pressure
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3rd Stage Leakage
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≤8.7 L/min
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@Supply Pressure 21MPa
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Polarity @lnput D(-), E(+)
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Flow out port C1
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Frequency
Response
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90°PL
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≥100 Hz
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@Supply Pressure 21MPa
±25% Input
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Gain
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≤+2 dB
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Pilot Line
for Pilot valve
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Supply
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External
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Return
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External
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Pin F Out of
Spool Pos.Signal
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Output
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±10 V
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Polarity
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(+)
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@Flow out C1
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Pin"G”Out for Signal of Pilot Valve
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±10 V
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Input Impedance
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Pin D Input
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10KΩ
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Pin E Input
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20KΩ
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Pin F
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100Ω
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