Pedrollo JSW 1-2 Self-Priming Jet Pump 0.37-0.9 kW

Pedrollo JSW 1-2 pump explained

The Pedrollo JSW 1-2 is a self-priming centrifugal jet pump for clean water, with flow up to 70 l/min (4.2 m³/h), head up to 58 m and suction lift up to 9 m. It has a cast iron body, a stainless steel AISI 304 impeller and pump cover, and a Noryl ejector unit. Seven Star LLC supplies the JSW 1-2 in Oman and the GCC as an independent supplier in Muscat.

JSW 1 and JSW 2 are two size classes, and the final letter chooses the impeller: C is the smallest and A the largest. The datasheet lists JSW 1C at 0.37 kW, JSW 1B at 0.48 kW, JSW 1A at 0.55 kW, JSW 2C at 0.75 kW and JSW 2A at 0.90 kW. A lower-case m after JSW (JSWm) means single-phase 230 V. A cost-effective version with a technopolymer impeller, the JSW X, is available on request.

JSW 1-2 technical specifications

The values above come from the manufacturer technical data for the series. Individual models inside the JSW 1-2 range differ in power, head and current, so always confirm the exact model code before ordering.

How the JSW 1-2 works and what limits it

Pump pressure limits are 6 bar, liquid temperature -10 to +40 °C and ambient up to +40 °C, with IP X4 protection. The shutoff head shown in the table goes from 34 m for the JSW 1C to 58 m for the JSW 2A. In practice, the JSW 1-2 works with a small to medium pressure tank, where its ability to draw water with air in the suction line is more valuable than very high flow.

A self-priming jet pump combines a centrifugal impeller with an ejector fitted in the pump body. Part of the delivery flow is recirculated through the ejector nozzle, which creates the depression that draws air and water up the suction line, so the pump can evacuate the suction pipe and prime itself after the body has been filled once. Because the pump tolerates air mixed into the suction flow, it suits wells, tanks and cisterns where the water level changes. The suction lift is limited to the manometric value on the data sheet, and the check valve at the end of the suction line keeps the pipe full between starts.

JSW 1-2 models and performance data

The heads in this table are read from the first point of the manufacturer 50 Hz performance table and fall as flow increases, so use the full curve for the real duty point. Where a 60 Hz version is needed, ask us: the manufacturer states that 60 Hz motors are available on request for many models.

Where the JSW 1-2 fits: related Pedrollo pumps

For higher heads see the JSW 3 (up to 97 m and 160 l/min), for an all stainless body see the JCR, and for multi-stage self-priming duty see the PLURIJET 90-120.

Selecting a JSW 1-2 pump: checklist

• Set the required head: 34 to 58 m at the first table point across five models
• Check suction conditions, up to 9 m manometric lift
• Pick single-phase JSWm or three-phase JSW
• Confirm liquid is clean water below 40 °C
• Decide between the stainless steel impeller and the JSW X technopolymer version

Installing and maintaining the JSW 1-2

Install the pump close to the water source on a rigid base with the motor shaft horizontal. Use a suction pipe of at least the pump port size, laid with a constant upward slope and with all joints sealed, because any air leak lengthens priming time or stops it altogether. Fit a foot valve or check valve at the lower end of the suction pipe and a strainer to keep debris out of the ejector. Fill the pump body through the filling plug before the first start. On three-phase versions confirm the rotation direction. When the pump feeds a pressure tank, set the pressure switch and tank pre-charge to suit the duty so the unit does not cycle too often, and drain the pump in cold weather or when it will stand unused.

JSW 1-2 applications in Oman and the GCC

Typical use in the GCC includes house and farm water supply from a well or underground tank, garden irrigation and top-up of overhead tanks. Because the suction lift is limited to 9 m and the water must be below 40 °C, avoid installing the pump in direct sun and use a shaded, ventilated enclosure for the summer months.

Many Omani villas and farms use a ground tank with a transfer pump, and a self-priming pump is practical because the suction line can drain and refill with air. The main risks are warm water above the stated limit, sand from wells, and suction leaks. Shade the pump, fit a strainer, and check the foot valve for scale every year.

Information to send with your JSW 1-2 RFQ

• Flow and delivery pressure required at the point of use
• Water source (well, tank, cistern), suction lift and suction pipe length and diameter
• Liquid temperature and quality, including any sand in the source
• Supply: single-phase or three-phase, voltage, frequency
• Pressure tank, switch or control accessories needed, and the quantity required

Documents and quotation

The manufacturer datasheet for the JSW 1-2 is attached on this page, and the performance tables in it should be checked against your duty point. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.

Send the model code, quantity, voltage and frequency and the duty point, and we will confirm availability and prepare a quotation for Oman and the GCC.