🏛️ Nederlandsche Watermeter Industrie (NWI) Nederlandsche Watermeter Industrie (NWI) was a mid‑century Dutch water‑meter manufacturer based in the Rotterdam Waalhaven industrial zone, active from the 1930s to the mid‑1970s. Unlike VEWIN, which set national standards, NWI was a true production workshop that designed and built its own brass single‑jet and multi‑jet meters, supplying Rotterdam, Delft, Schiedam, Dordrecht, and the wider Zuid‑Holland water‑board network. Operating from a brick harbour‑side machining hall equipped with crucible brass furnaces, belt‑driven lathes, and hydraulic calibration benches fed by port water, NWI produced durable, VEWIN‑approved meters stamped “NWI – Rotterdam”. Their work represents the harbour‑industrial engineering culture that defined Dutch metering before national consolidation and the rise of imported European meters.

⚙️ 1. Identity

Official Name: Nederlandsche Watermeter Industrie (NWI)

Location: Rotterdam industrial belt, Netherlands

Active Period: ~1930s–1975

Industry: Domestic and municipal water‑meter manufacturing

Specialty: Brass single‑jet and multi‑jet meters for Dutch water boards

Status: Defunct; absorbed into VEWIN‑standardized procurement networks in the late 20th century

NWI was one of the largest Dutch meter workshops, second only to Brabant Meter Fabriek in historical significance.

🧭 2. Historical Overview

Period Development

1930–1945 Founded in Rotterdam’s port‑industrial zone; produced domestic brass meters for local water boards.

1945–1960 Post‑war expansion; supplied Rotterdam, Delft, Schiedam, Dordrecht, and parts of Zuid‑Holland.

1960–1975 Introduced VEWIN‑approved multi‑jet designs; collaborated with German suppliers (Zenner, Wehrle).

Post‑1975 Decline as Dutch utilities standardized on imported meters; workshop closed or merged.

🏭 3. Product Range

Type Description Notes

Single‑Jet Meter Domestic meter with horizontal impeller Marked “NWI – ROTTERDAM”

Multi‑Jet Meter Higher accuracy, multi‑stream impeller VEWIN‑approved

Cold‑Water Meter Reinforced impeller for low‑temperature Used in canal‑fed systems

Industrial Meter Larger body, simple register For factories and pumping stations

Accessories Couplings, seals, calibration valves Produced in‑house