Model Interpretation

D662: NG16 installation base, jet pipe pilot, built-in electrically controlled closed-loop servo valve series

4038: Flow code, unilateral pressure difference ΔP = 35bar, rated flow 510L/min, higher than 4037 (460L/min); standard configuration includes internal control T return oil + external Y leakage oil port; common suffix D02HABF6VSX2 is equipped with O-type neutral position, nitrile seal, ±10V voltage control, 7-pin aviation plug, full travel LVDT feedback. Technical Specifications

Hydraulic parameters

Rated flow rate: 510L/min (single throttle port with 35bar pressure difference); 70bar pressure difference limit flow ≈ 1040L/min

Pressure resistance: Maximum 350bar for the main oil ports of P/A/B; Internal control T return oil ≤ 50bar; Y external oil outlet withstands 350bar pressure

Dynamic response: Under 210bar supply pressure condition, 100% full stroke step response < 20.5ms

Control accuracy: Hysteresis < 0.2% FS, resolution < 0.1% FS, -20~55℃ full temperature zero drift < 1.8% FS

Zero position leakage: 0.40~2.4L/min

Applicable media: Mineral hydraulic oil, oil cleanliness NAS6~7 grade, working oil temperature -20℃~+80℃

Overall machine net weight: 3.25kg

Electrical parameters

Power supply: DC24V (18~32VDC wide-range power supply), static power consumption of the entire machine ≤ 500mA

Standard control instructions: ±10VDC differential voltage, optional ±10mA, 4~20mA current signal

Electromagnetic standard: EN55011 industrial EMC certification

Interface and communication configuration

Hydraulic interface: ISO4401-07 NG16 standard installation holes, P inlet, T internal return oil, A/B load oil ports, Y independent external return oil port

Electrical interface: 7-pin circular aviation socket, integrated power supply, control signal, LVDT feedback wiring, control line double-layer shielding, control cabinet single-point grounding

Control form: Pure analog closed-loop control, no industrial bus communication interface Core function

The servojet jet pipe's pilot structure has a better resistance to oil impurities than the nozzle baffle, resulting in a lower failure rate in dusty and impure conditions.

The built-in LVDT valve core is fully closed-loop, and the onboard circuit automatically compensates for zero drift caused by high and low temperatures, ensuring excellent stability during long-term continuous operation.

The D02 model is equipped with an O-type neutral function. In the event of power loss, the spring automatically returns to the center and locks the A/B oil ports, ensuring the pressure retention lock of the hydraulic cylinder and safeguarding the safety of equipment during shutdown.

With an extremely large flow capacity and linear flow characteristics, a single valve can independently complete multi-mode closed-loop switching control of position, speed, and pressure. Applicable scenarios

High-speed injection system of the giant cold chamber die-casting machine, closed-loop injection for the ten-thousand-ton heavy injection molding machine, AGC hydraulic lowering for medium-thick plate rolling machines, large-scale forging hydraulic units, heavy-load hydraulic comprehensive test bench, heavy-duty component fatigue testing equipment.

Operation and maintenance instructions

At the front end of the oil inlet pipeline, a 3μm high-pressure precision filter is installed. The first set of filter elements should be replaced after 15 working days when the new machine is put into use.

The power cable and shielded control line are laid in separate channels to avoid harmonic interference from the frequency converter and high-power motor to the analog signal.

Zero point and gain are factory-calibrated. Only minor electrical fine-tuning is allowed on site. It is strictly prohibited to disassemble the pilot valve and main valve core components of the jet pipe privately.

All P/T/A/B/Y oil ports are sealed and stored for long-term inventory. They are stored in a dry and dust-proof warehouse to delay the aging and leakage of the seals.