Davey D75G Cast Iron Double Mechanical Seal Submersible Grinder Pump for Grey Water with Open Impeller

Managing domestic sewage and septic effluent in residential pits requires a specialized hydraulic solution capable of reducing solids to a manageable slurry. The Davey D75G is an advanced manual grinder pump engineered to handle black water and grey water containing soft organic solids and sanitary products. By utilizing a heavy-duty shredding and grinding ring at the inlet, the unit prevents blockages in small-diameter discharge pipe systems. This centrifugal unit is specifically designed for sump emptying and water transfer in environments where standard dewatering pumps would fail due to solid accumulation.

Hydraulic force is provided by a 0.75 kW single-phase motor operating on a standard 240v supply to satisfy demanding residential discharge requirements. The assembly delivers a maximum flow rate of approximately 150 L/Min and reaches a maximum total head of 18.5 metres to support connection to pressure sewer mains. An electrical configuration maintaining a 7.5 Amps full load current ensures consistent performance at a synchronous speed of 2900rpm. This robust profile allows for the efficient evacuation of waste water through the 1 1/4" BSP F outlet port.

The internal shredding system features a high chromium steel grinding ring and shredding ring that aggressively macerates textiles and soft solids. This mechanism works in tandem with a cast iron open impeller to maintain high fluid velocity and prevent internal clogging. By shredding waste into a slurry, the pump allows for the use of smaller, more cost-effective piping for long-distance effluent disposal. The centrifugal design is optimized for continuous reliability in sub-surface domestic pits.

Mechanical integrity is reinforced by a heavy-duty powder-coated cast iron pump body and a 304 stainless steel motor shell. Motor protection is achieved through a double mechanical shaft seal in an oil bath, utilizing hard-faced silicon carbide and ceramic materials on the pump side. For operational security, the unit includes an automatic resetting thermal overload and a 10-metre HO7RN-F oil-resistant lead. The architectural casting includes mounting feet with rubber cushions for a stable and firm installation.

FEATURES

• Heavy-duty high chromium steel shredding and grinding ring at the inlet macerates solids into a slurry.
• Open centrifugal cast iron impeller prevents internal blockages while maintaining high head discharge.
• Double mechanical shaft seal in an oil bath with silicon carbide faces ensures maximum motor insulation.
• Corrosive resistant 304 stainless steel motor shell and fasteners provide lasting structural integrity.
• Integrated mounting feet with rubber cushions ensure firm and stable positioning in the pit.
• Automatic resetting thermal overload protects the 0.75 kW motor from electrical and thermal stress.
• HO7RN-F 10 metre oil-resistant power lead with bare wire ends for professional termination.