Model Interpretation

D662: NG16 standard installation base, ServoJet jet pipe pilot, integrated electronic control drive module inside the valve body series

4124: Flow coding, unilateral throttling pressure difference ΔP = 35 bar, rated flow 1340 L/min, flow higher than 4118B (1275 L/min); internal control T return oil + Y independent external oil outlet configuration; standard configuration suffix D02HABO6NSF2-A, O-type neutral function, NBR nitrile seal, ±10V differential voltage command, 7-core circular aviation plug, full stroke LVDT valve core feedback, paired with pilot valve D061-9324. Technical Specifications

Hydraulic parameters

Rated flow rate: 1340L/min (single throttle port with 35bar pressure difference); maximum flow through 70bar pressure difference ≈ 2395L/min

Pressure resistance: Maximum pressure at the main oil ports of P/A/B is 350bar; internal control T return oil working pressure ≤ 50bar; external leakage Y port withstands 350bar pressure

Dynamic response: At 210bar supply pressure condition, 100% full stroke step response < 30ms

Control accuracy: hysteresis < 0.2% FS, resolution < 0.1% FS, zero point drift within -20~55℃ is < 2.3% FS

Zero leakage: 0.78~3.85L/min

Applicable media: Mineral anti-wear hydraulic oil, oil cleanliness NAS6~7 grade (ISO4406 17/14/11), working oil temperature -20℃~+80℃

Overall machine net weight: 3.87kg

Electrical parameters

Power supply: DC24V (18~32VDC wide voltage input), static power consumption of the entire machine ≤ 720mA

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

Electromagnetic compliance: EN55011 industrial EMC certification, matching original factory plug with protection level IP65.

Interface and communication configuration

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

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

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

1. The servojet jet tube pilot structure has a better ability to resist solid impurities in the oil compared to the nozzle baffle structure. It is suitable for harsh working conditions such as metallurgy, forging, and die-casting with high dust content, and has a lower failure rate.

2. The built-in LVDT valve core is fully closed-loop + onboard drive circuit. It can automatically compensate for zero-point offsets due to high and low temperatures in real time and supports 24-hour uninterrupted full-load continuous operation.

3. The D02 model is equipped with an O-type neutral function. In the event of power loss, the spring automatically returns to the neutral position and locks the A/B oil ports. The hydraulic cylinder is locked and maintained in pressure, meeting the safety standards for equipment failure shutdown.

4. The ultra-large flow passage cavity and excellent linear flow gain allow the single valve to seamlessly switch between position, speed, and pressure multi-closed-loop control modes. Applicable scenarios

Ultra-thick plate hot rolling unit AGC hydraulic lowering system, ten-thousand-ton multi-directional forging hydraulic main unit, super-large horizontal cold chamber die-casting high-speed injection unit, high-power marine hydraulic comprehensive test bench, giant carbon fiber composite material molding equipment, super-heavy multi-channel hydraulic fatigue loading test machine.

Operation and maintenance instructions

1. A 3μm high-pressure precision filter must be installed at the front end of the oil inlet main pipe. The first set of filter elements should be replaced 15 working days after the new machine is put into operation.

2. Power strong current cables and shielded control signal lines are laid in separate cable trays to avoid harmonic interference from the frequency converter and high-power motors to the analog control signals.

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

4. When the equipment is idle and sealed for a long time, all P/T/A/B/Y oil ports should be fully blocked, and it should be stored in a dry and dust-proof warehouse to delay the aging and leakage of the sealing parts.