Water supply and wastewater networks in Australian cities and regional infrastructure rely on thousands of manually and automatically operated valves for flow control, isolation, and pressure management. For valves of DN250 and above, a worm gearbox actuator is the industry-standard mechanism for mechanical advantage multiplication, enabling one operator or a small electric motor to generate the high operating torque needed to move large valve discs or gates against full pipeline pressure.
The worm gearbox serves two roles in valve actuation: it multiplies the input torque by the reduction ratio, and it mechanically locks the valve disc in its commanded position between operations. This second function — the inherent self-lock — is critical in water infrastructure, where valve position instability under pipeline pressure fluctuations could cause uncontrolled flow surges or water hammer events.
Australian water utility specifications — Water Services Association of Australia standards, state utility specifications including Sydney Water, Melbourne Water, SA Water, and Water Corporation WA — routinely specify worm gear actuators for butterfly, gate, and sluice valve installations in transmission mains, treatment plants, and pumping stations.
In the water and wastewater sector, worm gearboxes are deployed across the full range of valve types and sizes:
Material specification for water/wastewater service: Worm shaft in stainless steel 316 — essential for resistance to chloride-bearing water in coastal treatment plants and to the chlorine residual in potable water systems. Worm wheel in cast phosphor bronze — self-lubricating, corrosion-resistant, with excellent durability at 0.2–2 RPM output speeds typical of large valve actuators. Housing in stainless steel 316 for coastal environments; ductile iron with epoxy lining for inland freshwater installations.
AS compliance: Worm gearboxes for valve actuators in Australian water infrastructure must meet dimensional compatibility requirements per AS 4795 (butterfly valves) and AS 2638 (gate valves). Our ウォームギアボックス are available with ISO 5211 actuator mounting flanges — the interface standard referenced by AS 4795 — ensuring direct compatibility with all major butterfly valve brands used in Australian water projects.
以下の表を使用して、適切なモデルを特定してください。主なパラメータには、減速比、出力トルク、シャフト寸法、ハウジング材質が含まれます。常に正しいものを適用してください。 サービス係数（SF） 使用サイクルに合わせて。
| パラメータ | 標準範囲／値 | 選考ノート |
|---|---|---|
| 比率 | 20:1 – 100:1 | Select based on manual input torque limit or motor torque |
| 出力トルク | 50 – 4,200 N·m | Covers DN50 ball valve to DN2000 butterfly valve |
| Input Interface | Handwheel, IEC 60034 motor flange, or square drive | All three input types available on same gearbox body |
| Output Interface | ISO 5211 actuator flange (F07–F25) | Directly compatible with AS 4795 butterfly valve stem |
| ハウジング材 | Ductile Iron or SS316 | SS316 mandatory for coastal / potable chlorinated water |
| Shaft Seals | FKM double-lip (water-grade) | Superior chlorine and chemical resistance vs standard NBR |
| 保護等級 | IP65 standard; IP67 valve chamber duty | IP67 for valve pits subject to inundation |
► サービス係数（SF）： 均一荷重SF=1.0 | 中程度の衝撃SF=1.25～1.5 | 重度の衝撃／24時間連続SF=1.75～2.0
► 周囲温度： 標準ユニットの動作温度範囲は-10℃～+40℃です。オーストラリアの高温環境（45℃以上）で使用する場合は、高温用潤滑剤と15%規格に基づく熱定格低減が必要です。
フレームサイズは025～150までご用意。単段減速比は5:1～100:1。出力トルクは最大4,200 N·m。ハウジングはアルミニウムまたはダクタイル鋳鉄製。モーターフランジはIEC B5/B14規格。IP65標準、IP66/IP67オプション。潤滑油は合成油または鉱物油。
顧客の課題： A metropolitan water treatment plant was experiencing corrosion-related failures on valve actuator worm gearboxes in the filtration cell gallery. The chloramination dosing system maintained approximately 3 mg/L free chlorine in the water atmosphere, attacking the standard grey iron housing and NBR shaft seals within 18 months.
解決： SS316 housing worm gearboxes (ratio 40:1, FKM double-lip seals, ISO 5211 F10 output flange, IP65) were installed on all 24 filtration cell butterfly valves.
結果： No corrosion failures in 36 months of monitoring. Scheduled replacement interval extended from 18 months to the target 10-year asset lifecycle. Annual actuator maintenance cost reduced by 68%.
顧客の課題： A wastewater pumping station in Brisbane was using chain-wheel manual operation on DN600 gate valves — a two-person operation requiring 45 minutes per valve. A safety review mandated conversion to single-operator handwheel gearbox operation.
解決： NRV series worm gearboxes (ratio 50:1, ductile iron with epoxy lining, IP65, SS316 shaft extension, handwheel input) were fitted to all six pump isolation gate valves. The 50:1 ratio reduced the required handwheel force from over 250 N to under 60 N.
結果： Single-operator valve operation achieved. Valve exercise time reduced from 45 minutes to under 8 minutes per valve. Ergonomic risk assessment rating improved from ‘high’ to ‘acceptable’.
顧客の課題： A regional water authority was converting manual isolations on a 220 km rural transmission main to remote motorised operation. The existing manual gate valves required 2 operators and 90 minutes to isolate each section — unacceptable for emergency response during pipeline burst events.
解決： NMRV-130 worm gearboxes (ratio 80:1, 415V 3-phase motor with SCADA relay interface, ductile iron IP65, solar-backup panel for remote sites) were installed at 7 key isolation points.
結果： Emergency isolation time reduced from 90 minutes to under 4 minutes via SCADA command. The authority’s emergency response plan was revised to include remote valve isolation as the primary containment response.
NMRV / NRVシリーズウォームギアボックス - フレームサイズ025～150、ISO 9001:2015規格に準拠して製造
20年以上の製造実績
2003年よりISO認証取得済みの生産体制。ウォームギアボックスは60カ国以上に出荷されています。
リモートテクニカルサポート
オーストラリアのタイムゾーンをまたいだビデオ通話による診断。現地訪問なしで迅速な対応が可能。
OEM/ODMカスタマイズ
非標準シャフト、中空ボア、特注フランジ、各種比率に対応可能です。図面レビューも承ります。
工場直販価格
販売代理店のマージンは一切ありません。透明性の高いボリュームディスカウントで、リピート注文で大幅な割引が受けられます。
当社のエンジニアは、お客様の用途に最適なウォームギアボックスのモデル、ギア比、シャフト構成、および取り付け方法をご提案いたします。
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