Three-Stage Electrohydraulic Flow Controlling Servo Valve with Two Nozzles and Flapper Force Feedback
Design Features
(1) Using a double-nozzle flapper valve as the pilot stage, and furnished with electric feedback for main valve core position.
(2) Good dynamic behavior, and low energy consumption. Able to meet requirements for valves with high frequency response and flow from industrial fields.
(3) Using an external controlling amplifier for easy adjustment, and allowing a user selecting external controlling and discharging way for pilot controlling oil.
|
Item Model |
QDY3 |
|
Supply oil pressure range (MPa) |
2~21 |
|
Rated supply oil pressure (MPa) |
21 |
|
Rated flow Qn (L/min) (@ valve pressure drop of 7MPa) |
400,500 |
|
Rated signal |
±10mA, ±10V |
|
Hysteresis (%) |
≤4 |
|
Resolution (%) |
≤1 |
|
Non linearity (%) |
≤±10 |
|
Asymmetry (%) |
≤±10 |
|
Pressure gain (%Ps/1%In) |
>30 |
|
Internal leakage (L/min) |
≤4 |
|
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~+150 °C) (%) |
≤±4 |
|
Frequency characteristics |
Amplitude frequency width (-3dB) (Hz) |
≥30 |
|
Phase frequency width (-90°) (Hz) |
≥35 |
|
Work temperature (°C) |
-30~+100 |
|
Net weight (kg) |
9.8 |
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.
The main products of BMTI PRECISION MECHATRONICS Co., Ltd include hydraulic products, such as electrohydraulic servo valve, servo amplifier, quantitative grease valve, electric cylinder and hydraulic system, and electromachining products, such as electric discharge machine, FANUC wire electric discharge machine and YGS series small hole drilling EDM.
