JS JST KB Industrial Heavy Duty Pumps 400v

Where JST KB Slurry Pumps Work Best

KB pumps earn their keep wherever water picks up abrasive solids: quarry and gravel pit sumps, open-pit mine floors, settling basins and retention ponds, dam drainage and large construction excavations in sandy ground. The high-chrome wet end resists wear that would quickly finish a standard drainage pump, and the agitator keeps the solids moving so the pump keeps drawing.

Size the pump on the duty point, not the headline figures. The maximum flow is only reached at very low head, and every metre of lift and every length of hose eats into it, so read the curve at your real total head. Our guides to reading a pump curve and pump head and flow rate walk you through it.

Stand the pump on firm ground or suspend it, so the strainer does not bury itself in silt. Where the water is clean or only lightly dirty, the JST and JST-H drainage pumps are a simpler choice, and our full range of dewatering pumps covers other site duties.

Frequently Asked Questions

What does the agitator on a KB pump do?

The agitator sits at the pump inlet and stirs sand and silt that has settled in the sump back into suspension, so the pump moves it away with the water rather than letting it build up around the inlet and choke the impeller. It is high-chrome iron, like the impeller and wear plate.

What is the difference between KB and KBH models?

KBH is the high-head version. It uses the same motor as the matching KB model with a smaller outlet and a pump end designed for pressure, so it lifts water higher but moves less of it. The JST-75KBH, for example, reaches 43 m at up to 1,200 l/min, while the JST-75KB reaches 31 m at up to 1,950 l/min.

Should I choose a JST KB or a JST KZN pump?

Both have a built-in agitator. KB pumps run at 3,000 rpm, pass solids up to 10 mm and reach higher heads, which suits sandy and silty water that must be lifted a long way. The JST KZN range runs at a slower speed and is built to pass larger solids in thicker sludge, with the KZN-H and KZN-L versions covering higher-head and higher-volume duties.

What power supply and controls do KB pumps need?

Every KB model needs a 400v three-phase supply, from the mains or a generator rated for the motor, which runs from 5.5 kW to 22 kW. The built-in thermal overload is a backstop, so run the pump through a suitable three-phase starter or control panel with motor protection. For unattended running, add level control through the panel; see our pump controls.

What size hose do I need?

Match the outlet: 3-inch on the JST-55KBH, 4-inch on the JST-55KB, JST-75KBH and JST-110KBH, and 6-inch on the JST-75KB, JST-110KB, JST-150KB and JST-220KB. On long runs, going a size larger cuts friction losses; our guide to discharge pipe sizing explains why, and you can find layflat and fittings in our hose and accessories range.

Can a KB pump handle sewage?

No. KB pumps are designed for water carrying sand, silt and light slurry, not raw sewage, rag or fibrous material, which can wrap around the impeller. For sewage on a three-phase supply, look at the JST SV sewage vortex pumps.

If you would like help matching a KB pump to your site, sump or discharge run, call the AES Rewinds team on 01252 515169 or email sales@aesrewinds.com. You can also browse the full JS Pumps range or our industrial water pumps.