Model Interpretation

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

4087: Flow coding, unilateral throttling pressure difference ΔP = 35 bar, rated flow 980 L/min, flow greater than 4083 (920 L/min); internal control T return oil + Y independent external oil outlet configuration; standard configuration suffix D02HABF6VSX2, O-type neutral function, NBR nitrile seal, ±10V differential voltage command, 7-core circular aviation plug, full stroke LVDT valve core position closed-loop feedback. Technical Specifications

Hydraulic parameters

Rated flow rate: 980L/min (single throttle port with 35bar pressure difference); 70bar pressure difference limit flow ≈ 1860L/min

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

Dynamic response: Supply oil at 210bar condition, 100% full stroke step response < 26ms

Control accuracy: Hysteresis < 0.2% FS, resolution < 0.1% FS, -20~55℃ full temperature zero drift < 2.2% FS

Zero position leakage: 0.60~3.2L/min

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

Overall machine net weight: 3.52kg

Electrical parameters

Power supply: DC24V (18~32VDC wide voltage input), total machine static power consumption ≤ 600mA

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

Electromagnetic compliance: EN55011 industrial EMC electromagnetic compatibility certification

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 round aviation socket, integrated power, control signal, LVDT feedback wiring, control line double-layer shielding, control cabinet single-point grounding

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

The servojet jet tube pre-installed structure has superior performance in resisting solid impurities in hydraulic oil compared to the nozzle baffle structure. It has a lower failure rate in harsh metallurgical and die-casting environments with multiple impurities.

The built-in LVDT valve core is fully closed-loop, and the onboard drive circuit automatically compensates for zero-point offsets due to high and low temperatures, supporting 24-hour uninterrupted continuous full-load 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, locking the hydraulic cylinder and maintaining pressure, meeting the safety standards for equipment failure shutdown.

With an extremely large flow capacity and excellent linear flow characteristics, a single valve can independently achieve seamless switching between position, speed, and pressure multi-closed-loop modes. Applicable scenarios

Hot rolling unit for thick plates, AGC hydraulic lowering system, multi-directional forging hydraulic main unit for 10,000-ton capacity, high-speed injection system for ultra-large heavy horizontal cold chamber die-casting machine, high-power marine hydraulic comprehensive test bench, giant carbon fiber composite material molding equipment, super heavy-duty hydraulic fatigue loading test machine.

Operation and maintenance instructions

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

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

Zero point and gain are factory-calibrated. Only minor electrical fine-tuning is allowed on site. Unauthorized disassembly of the jet pipe pilot and main valve core assembly is strictly prohibited.

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