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  • Electrohydraulic Servo Valve Qdy6 - China

    price: contact company for price

    Two-Stage Electrohydraulic Flow Controlling Servo Valve with Two Nozzles

    and Flapper Force Feedback

    Design Features

    (1) Using dry torque motor and two stages of hydraulic amplification structures: The pre stage is a friction free flapper valve of two nozzles.

    (2) High valve-core driving force, steady zero, high sensibility, high resolution, low hysteresis, and long reliability in service.

    QDY6

    Supply oil pressure range (MPa) 1.5-31.5

    Rated supply oil pressure (MPa)31.5

    Rated flow Qn (L/min) (at valve pressure drop of 7MPa) 4, 10, 20, 40, 60

    Rated current ln (mA) 15, 30, 40, 80

    Hysteresis(%) ≤3

    Resolution(%)≤0.5

    Non linearity(%) ≤±8

    Asymmetry(%) ≤±10

    Internal leakage (L/min)≤1.3

    Bias(%)≤±3

    Zero drift of supply oil pressure ≤±2

    Zero drift of return oil pressure ≤±4

    Frequency characteristics

    Amplitude frequency width(-3dB)(Hz) 60-100

    Phase frequency width(-90°)(Hz)60-100

    Net weight(kg) 1.2

    Model: QDY10

    Supply oil pressure range (MPa)1.5~28

    Rated supply oil pressure (MPa)25

    Rated flow Qn (L/min) (at valve pressure drop of 7MPa)100, 125, 150

    Rated current In (mA)40, 80

    Hysteresis (%)≤3

    Resolution (%)≤0.5

    Non linearity (%)≤±10

    Asymmetry (%)≤±10

    Pressure gain (%Ps/1%In)>30

    Internal leakage (L/min)≤2.5

    Bias (%)≤±3

    Zero drift of supply oil pressure (80-110% Ps) (%)≤±3

    Zero drift of return oil pressure (0-20% Ps) (%)≤±2

    Zero drift in temperature (-30~+150C) (%)≤±4

    Frequency characteristics

    Amplitude frequency width (-3dB) (Hz)>35-50

    Phase frequency width (-90°) (Hz)>30-50

    Net weight (kg) 4.0 for al. body, 7.5 for steel body

    Model: QDY11B

    Supply oil pressure range (MPa)1.5-21

    Rated supply oil pressure (MPa)16

    Rated flow Qn (L/min) (at valve pressure drop of 7MPa)200, 250

    Rated current In (mA)15, 30, 40

    Hysteresis (%)≤4

    Resolution (%)≤1

    Pressure gain (%Ps/1%In)>25

    Internal leakage (L/min)≤3.2

    Zero drift in temperature (-30~+150 C) (%)≤±4

    Frequency characteristics

    Amplitude frequency width (-3dB) (Hz)>20

    Phase frequency width (-90°) (Hz)>25

    Net weight (kg) 6.5

    Model: QDY12

    Supply oil pressure range (MPa)1.5-25

    Rated supply oil pressure (MPa)21

    Rated flow Qn (L/min) (at valve pressure drop of 7MPa)4, 10, 20, 40

    Rated current In (mA)30, 40

    Non linearity (%)≤±8

    Pressure gain (%Ps/1%In)>30

    Internal leakage (L/min)≤1.2

    Zero drift of supply oil pressure (80-110% Ps) (%)≤±2

    Amplitude frequency width (-3dB) (Hz)>120

    Phase frequency width (-90°) (Hz)>120

    Net weight (kg)1.4

    Model: QDY14

    Amplitude frequency width (-3dB) (Hz)60-100

    Phase frequency width (-90°) (Hz)60-100

    Net weight (kg)0.9

    Model: QDY15

    Internal leakage (L/min)≤1.5

    Amplitude frequency width (-3dB) (Hz)>50

    Phase frequency width (-90°) (Hz)>60

    Net weight (kg)0.8


    Company Contact:


    • Phone: 15801624867

    • Address: No. 4 Wangjing Road, Chaoyang District, Beijing, China

    • Email: Email


    Published date: August 20, 2013 -

    • Business Description: BMTI Precision Mechatronics Co., Ltd. started research of pneumatic and

      hydraulic automatic control technology as early as in 1950s, and her

      research results and application level are leading in China. In more

      than 50 years, she always adheres to the road combining scientific

      research with production, and the hydraulic and pneumatic products

      researched & developed independently by her have been widely used in

      metallurgy, aerospace, shipbuilding, automobile, textile, and printing

      industry. Her modern manufacturing equipment and inspection conditions

      as well as perfect quality management system have ensured the steady and

      reliable quality of her products. She owns a professional and complete

      R&D team with rich practical experiences, and can undertake research of

      subjects specified by the state as well as development of new products,

      also complete turnkey projects for hydraulic and pneumatic subjects, and

      customize personalized solutions for the users focused at pneumatic and

      hydraulic technology.

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