Vega DZA Pumps

The Vega DZA(S) is a flanged end-suction centrifugal pump with a stainless steel 304 casing and impeller, built to the DIN 24255 standard for irrigation, water transfer and pressure boosting. It comes in four frame sizes, 50, 65, 80 and 100, either as a stub-shaft (bareshaft) pump for your own motor or complete with a 220V, 380V or 525V motor. This guide explains the model codes, performance, materials and current prices.

Why choose a stainless steel DZA?

A cast iron end-suction pump is cheaper, but it rusts in aggressive or slightly acidic water, sheds iron into clean process water and seizes after standing idle. The DZA's casing and impeller are 304 stainless steel with a 316L shaft, so it suits borehole water with a low pH, food and beverage transfer, water treatment, and liquids compatible with 304 stainless steel. It also handles water with a little grit.

It is not self-priming. Like any end-suction centrifugal pump the DZA needs a flooded suction, or a foot valve and a full suction pipe, before it starts. Keep suction lift short and never run it dry: the mechanical seal fails in minutes without water.

Reading the model code

Take DZA 65-40-160/4.0: 65 is the suction flange (DN65), 40 the discharge flange (DN40), 160 the nominal impeller diameter in mm, and 4.0 the motor power in kW. A larger impeller gives more head; a larger flange size gives more flow.

Stub-shaft or complete with motor?

Models, performance and prices

Shut-off head is the head at zero flow from the Vega performance table. Select at your working flow from the curve on the product page. – means not listed or not published.

Sizing a DZA pump

1. Flow. Work out the flow you need in m³/h: irrigation area × application rate, or the transfer volume divided by the time available.
2. Total head. Static height from water level to outlet + friction in the pipes and fittings + the pressure needed at the outlet (10 m per bar).
3. Series. Larger flows need a larger frame: the 50 series for smaller duties, 65 and 80 for irrigation and transfer, 100 for high-volume work.
4. Model. Choose the model whose curve passes through your flow at your head, close to the middle of the curve where efficiency is best.
5. Motor. Match the supply: 220V single-phase up to 2.2 kW, otherwise 380V or 525V three-phase.

Worked example

A packhouse must transfer water at 20 m³/h to a tank 18 m above the pump, with about 7 m of pipe friction: total head 25 m. The 65-40-125/2.2 has a shut-off head of 26 m, too close to the duty. The 65-40-160/3.0 (31 m shut-off) or 65-40-160/4.0 (39 m) sit comfortably above it; check the curve at 20 m³/h and pick the smaller one that meets 25 m.

Construction and operating limits

Installation notes

• Bolt the pump and motor to a rigid base and align the coupling on stub-shaft installations; misalignment destroys bearings and seals.
• Suction pipe one size larger than the pump inlet, short, airtight, with an eccentric reducer flat side up so no air collects.
• Fit valves on both sides so the pump can be removed without draining the system, and a non-return valve on the discharge.
• Support the pipework independently; the pump flanges must not carry pipe weight.
• Protect the motor with a correctly set overload, or use a Vega 30Y / 30A controller or VSD for dry-run and soft-start protection.

Price guide

Prices include VAT and are correct at the time of writing. The product page always shows the current price.

Frequently asked questions

Related guides

• Vega Surface Pumps
• Vega DL Pumps — vertical multistage
• Vega Variable Speed Drives
• Vega Pumps
• Vega Stainless Steel 304 Centrifugal Pumps (Flanged) — shop the category