Grundfos 25S50-26 (51536265) Submersible Deep Well Pump 5 HP, 460V, 4" MTR, 1 1/2" NPT, 3-wire, 3 PH, 27.6" Pump End, 26 Stages

Grundfos 25S50-26 (51536265) is a 5 HP 460V Submersible Multistage Well Pump with 4" Motor and 27.6" Pump End (26 Stages) - made for 4" and larger wells or boreholes, recommended for domestic ground water market (approved for drinking water), irrigation/raw water supply, dewatering, groundwater lowering and pressure boosting and is suitable for pumping clean, non-aggressive liquids without solid particles or fibers and designed for residential, commercial, industrial and agricultural applications.

Grundfos Well Pump can be used in closed and open automatic water systems with different type of installation components and configuration. Standard installation requires check valves (recommended every 100'), torque arrestor, pressure switch and should include typical accessories such as lightning arrestor, expansion tank, pressure controls, gate valve, relief valve and tank valve drain - all are sold separately (see included PDF files). Additionally, enhanced protection capability and closer data monitoring can be provided by MP 204 motor protection unit with R 100 remote control.

The Pump is completely encapsulated in Stainless steel and suitable for horizontal and vertical installation. Grundfos Water Well Pump has 1 1/2" NPT discharge with head capacity of 785', maximum 104F operating liquid temperature and is fitted with a built-in non-return valve to minimize the risk of water hammering damage. Grundfos Well Pump boasts patented Stainless Steel Splined Shaft, Nitrile Radial Bellows Type Shaft-Seal and is retrofitted with NBR Rubber, Valox PBT and Tungsten carbide to handle the rigors of contaminated groundwater pumping with long-lasting reliability. Grundfos 25S50-26 is provided with a sand shield and pressure-equalizing diaphragm. Over temperature protection is provided with bi-metallic overloads. Specially designed Michell Type Carbon/Ceramic Thrust Bearing with Heavy-duty 1500 lb. thrust capacity, exceeds NEMA ratings. Grundfos 4 inch Submersible Water Well Pump utilizes High-grade 304 Series Stainless Steel construction for all vital components including impellers, diffuser, shaft, guide vanes, coupling and hardware. The Motor fill fluid (SML2) provides bearing lubrication, protects the motor from freezing down to 4F, prevents the growth of bacteria and requires no additional lubrication. A user friendly cable guard aids in ease of installation.

Powerful, Direct On-Line starter (DOL), 5 HP 3-phase MS 4000 motor (3450 RPM), delivers 25 GPM at 540', producing high efficiency output within a wide load range. In this type of starting a 3-phase motor, full voltage is applied to the motor through relays and contactors. DOL motor starter provides the highest locked-rotor current while causing minimal grid disturbance and will always give the lowest generation of heat, consequently providing the longest life span of the motor. Grundfos submersible motor is especially design to work underwater. In a canned type motor, the Stator Windings are enamel wire, hermetically sealed from the surroundings and filled with embedding material in order to withhold the windings and at the same time increase heat transfer. The motor has thrust and journal bearing system which runs hydrodynamically in the water-based motor liquid, consists of upper and lower radial bearings as well as upthrust and downthrust bearings.

Internal Water Circulation System of Grundfos 25S50-26 enhances motor cooling, where the clean water circulates around the entire motor, transferring heat away from windings and rotor and lubricating the bearing systems. Grundfos Water Well Pump features include filter check valve, pressure equalization diaphragm, sand slinger, epoxy coated bearing support, built-in surge protection and polyurethane self healing resin, provide superior reliability, higher efficiency and longer lifetime operation.