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Oct . 11, 2025 10:45 Back to list

4 Inch Deep Well Submersible Pump | High Flow & Head

A Field Tester's Take on 4-Inch Deep-Well Performance: 300QJR Series, OEM-Ready

If you’re speccing a 4 inch deep well submersible pump for farms, resorts, or small municipal retrofits, the 300QJR Deep Well Submersible Pump family is one I keep seeing on jobsites—often with quiet, unfussy reliability. The factory in Hebei (No. 6 Xingyuan Road, West District, Lincheng Economic Development Zone) leans hard into OEM work, which, to be honest, is where a lot of the value is these days.

4 Inch Deep Well Submersible Pump | High Flow & Head

Why this 4 inch deep well submersible pump niche still matters

Water tables are moody. You need lift (head), steady flow, and a motor that won’t blink at sandy surprises. The 300QJR platform covers multiple diameters, and the maker supports non-standard builds—handy for tight boreholes or unusual chemistry (slightly aggressive water, higher TDS). Many customers say the “plug-and-pump” simplicity is what won them over; personally, I like the traceable test sheets and the practical spare-part ecosystem.

Typical specs for a 4-inch configuration (OEM build)

Parameter Typical Value (≈, real-world may vary)
Flow 1–6 m³/h @ 50 Hz
Head 40–160 m
Power 0.75–3.0 kW (single/three-phase 220/380 V)
Motor Asynchronous, oil- or water-filled; IP68; Insulation Class F
Materials Casing/impellers: SS304/SS316 optional; Shaft: 431 SS; Diffusers: Noryl/SS
Discharge 1.25"–2" BSP/NPT
Water Temp ≤35°C (higher on request)
Standards GB/T 2816-2014, GB/T 2818-2014; ISO 9906 Grade 2B

Manufacturing and test flow (short version)

  • Materials: SS304/316 sheets and bars, precision-cast impellers, stator laminations.
  • Methods: CNC turning, laser welding for casings, dynamic balancing of rotors, VPI motor varnish.
  • Performance testing: ISO 9906/GB/T 3216 curves; hydrostatic pressure at 1.5× max working pressure; insulation ≥100 MΩ @ 500 VDC.
  • Service life: ≈10,000–20,000 hours in clean water with proper NPSH and cooling sleeve; sand-handling versions available.
  • Traceability: Serial-numbered test sheet per pump and motor.

Where it’s used

Agriculture pivots, remote lodges, construction dewatering, small municipal backup lines, and geothermal feed (low temp). In fact, a 4 inch deep well submersible pump is the workhorse for 100–150 mm boreholes.

4 Inch Deep Well Submersible Pump | High Flow & Head

Vendor snapshot (what you actually want to know)

Vendor OEM/Customization Standards Materials Lead Time
ACT (300QJR, Hebei) Yes; non-standard motors/pumps GB/T 2816, GB/T 2818, ISO 9906 SS304/316, 431 shaft ≈15–35 days
Global Brand B Limited options ISO 9906, IEC 60034 SS304, engineered plastics Stock/fast
Local Importer C Some mix-and-match Varies Mixed Varies

Real-world notes, testing, and certifications

  • Hydraulic curves validated to ISO 9906 Grade 2B; factory can provide curve sheets on request.
  • Electrical tests per GB/T 2818 and IEC 60034-1; routine HV test at 2× rated +1 kV (type test).
  • CE marking available; ISO 9001 QMS at the plant (ask for current certificate copy—always a good habit).

Mini case studies

  • Vineyard, 120 m head: OEM SS316 wet end lasted two seasons with iron bacteria; switched to anti-fouling cable and saw fewer trips.
  • Resort well retro: Narrow 110 mm casing; custom shorter stage stack delivered target 3 m³/h without overheating using a cooling sleeve.

Customization is the point: different impeller trims, extra cable length, sand-slinger bearings, and even non-standard voltages. WhatsApp: 17855846335. It seems small tweaks—like a thicker discharge head—often pay back in downtime saved. For a workhorse 4 inch deep well submersible pump, that’s the story.

Citations

  1. GB/T 2816-2014: Well submersible pump standard (China).
  2. GB/T 2818-2014: Well submersible asynchronous motor standard (China).
  3. ISO 9906:2012/2017: Rotodynamic pumps—Hydraulic performance acceptance tests; GB/T 3216-2019 (CN equivalent). Also see IEC 60034-1 for motor tests.


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