Centrifugal pump Helix FIRST V series

waterelectricself-priming

Overview
The Wilo-Helix FIRST V is a highly efficient, vertical multistage in-line pump combining a robust grey cast iron pump housing with corrosion-resistant stainless-steel hydraulics and an IE3 motor. It is suitable for water supply, pressure boosting, integration in cooling circuits, industrial applications and more. The compact design and integrated mechanical seal enable space-saving installation and convenient operation.

Key benefits

• IE3 fixed-speed motor ensures high efficiency
• Durable pump housing made of grey cast iron with cataphoretic coating plus laser-welded/cast stainless-steel hydraulics (AISI 304) for corrosion resistance
• Compact, space-saving design with integrated mechanical seal (up to 16 bar; above 16 bar with cartridge mechanical seal)
• Maintenance-friendly: easy access to components (bearing integrated in the lantern, spacer coupling, cartridge mechanical seal when used)
• Suitable for high ambient temperatures up to +50 °C (without power dissipation)

Product features

• Efficient IE3 fixed-speed motor
• Lifting bolts for handling
• Integrated standard mechanical seal (up to 16 bar) to save space
• Laser-welded / cast stainless-steel hydraulics (AISI 304) with high corrosion resistance
• Robust grey-iron pump housing with cataphoretic coating
• Round flanges available (PN 16 / 25 / 40)

Design
Non-self-priming, high-efficiency multistage high-pressure centrifugal pump in vertical in-line design with in-line connections.

Application

• Water distribution and pressure boosting
• Industrial circulation systems
• Process water
• Closed cooling circuits
• Fire-fighting systems
• Washing systems
• Irrigation

Equipment / Function

• Corrosion-resistant impellers, guide vanes and stage housings

Type key (example and explanation)
Example: Helix FIRST V 3606/2-5/25/E/KS/400-50
Helix FIRST V = Vertical high-pressure multistage centrifugal pump in in-line design
36 = Flow rate in m3/h
06 = Number of impellers
2 = Number of trimmed impellers
5 = Pump material (5 = Pump housing EN-GJL 250 cataphoretic-coated, Hydraulics 1.4307 (AISI 304L))
25 = Maximum operating pressure in bar
E = Seal type (E = EPDM)
K = Cartridge type mechanical seal
S = Coupling guard is aligned with suction and discharge ports of the pump
400 = Connection voltage in V

Scope of delivery

• Helix FIRST V high-pressure multistage centrifugal pump
• Installation and operating instructions
• Helix FIRST 2-16 (version PN16 with oval flanges): cast iron counter flanges with corresponding screws, nuts and gaskets (where applicable)

Materials

• Impellers, stage housings and guide vanes: stainless steel 1.4307 (AISI 304L) or 1.4401 (AISI 316)
• Pump housing: EN-GJL 250, cataphoretically coated
• Shaft: stainless steel 1.4057 (AISI 304L)
• Sleeve under mechanical seal: 1.4404 (AISI 316L)
• O-ring: EPDM
• Jacket pipe: stainless steel 1.4301 (AISI 304)

Caractéristiques / spécifications techniques

• Electrical connection: 3~400 V ±10 %, 50 Hz
• Fluid temperature range: -30 to +120 °C
• Max. operating pressure: selectable 16, 25 or 30 bar (depending on version)
• IP rating: IP55
• Max. ambient temperature: -15 °C to +50 °C
• Helix FIRST V 2 – 16: PN 16 with oval flanges; PN 25 / PN 40 with compatible round flanges per ISO 2531 / ISO 7005 (≤ 16 m3/h: oval flanges)
• Helix FIRST V 22 – 52: PN 16 / PN 25 / PN 40 with round flanges per ISO 2531 / ISO 7005