JS JST SV Sewage Vortex Submersible Pumps 400v

The JST SV range is a three-phase submersible sewage vortex pump series built for commercial and industrial wastewater applications that a domestic pump simply cannot handle. Each model uses a cast iron vortex impeller, which creates a swirling flow pattern that lets soft solids pass through the pump body rather than through the impeller itself. This keeps blockages to a minimum when pumping sewage effluent, viscous liquids, or drainage water carrying suspended debris.

Nine models cover flow rates from 250 l/min up to 3,175 l/min, with heads ranging from 8m to 30m depending on the specific model. All units in the range are supplied with twin mechanical seals in carbon ceramic and silicon carbide, running in a lubricated chamber for extended service life, along with 10 metres of power cable as standard. The construction is cast iron throughout, with a stainless steel shaft and motor casing to withstand rough handling and abrasive water.

These pumps suit facilities managers and contractors specifying equipment for commercial kitchens, hotel and leisure wastewater, remote pumping stations for housing developments, agricultural effluent, and any application where raw sewage or dirty water needs to move reliably against gravity.

Choosing the right JST SV model

The model number after “JST” refers to the motor power in kW multiplied by 10, so a JST-4 SV runs a 0.4kW motor and a JST-75 SV runs a 7.5kW motor. Larger numbers mean higher flow rates and, in most cases, greater head capacity, though this isn’t a straight line: the JST-22 SV is offered in both 2-pole and 4-pole versions, and these behave quite differently.

The 2-pole JST-22 SV spins faster and is tuned for higher head at a moderate flow rate (1,000 l/min at up to 20m head), while the 4-pole version prioritises volume over pressure (1,000 l/min+ but limited to 10m head). If your installation involves a long pipe run or lifting the discharge to a higher point, the 2-pole model is the better fit. If you’re simply moving a high volume of water over a short vertical distance, the 4-pole model is more efficient to run.

The JST-37 SV is also split into two variants by solids handling capability: an 80mm version for standard sewage and drainage duty, and a 57mm high-head version for applications needing greater lift. All outlet sizes from 2″ through to 4″ are covered across the range, so the right choice depends on matching your pipework, expected flow, and required head against the table below.

Prices shown are ex VAT and may vary. Click through to any model above