PREFILTER 65/65 Cast iron prefilter DAB.PREFILTER

Product detailed description

Industrial water circulation systems often require coarse particulate removal to protect downstream centrifugal pumps and filtration components. This cast iron prefilter is suitable for installations involving large-scale filtration systems, particularly those using monoblock centrifugal pumps or variable speed drives. The unit is typically found in commercial and industrial settings such as water treatment plants, cooling towers and chemical processing facilities where consistent water quality is essential.

Its design allows integration with a range of pump types, ensuring compatibility with existing infrastructure. The prefilter is installed upstream of the main pumping equipment to intercept debris and prevent damage to sensitive mechanical components. It is especially useful when handling raw water sources prone to carrying suspended solids or when the system includes reverse osmosis or ultrafiltration units that require pre-treatment stages.

Technical parameters

Nominal bore	DN 65
Code	60164699
Brand	IVAR

The nominal diameter defines the flow passage size and is critical for matching the prefilter to pipe diameters and pump inlet requirements. It ensures hydraulic compatibility with pump inlets and piping systems designed for similar flow rates.

Installation and connection

To install, align the prefilter body with the pipeline and secure it using the appropriate flange connections. The nominal diameter should match the pipe and pump inlet sizes. Check that the sealing surface is clean and free from debris before tightening the three or four special closure bolts. Avoid over-tightening to prevent warping of the lid. Common mistakes include mismatching the flange type or using incorrect gasket materials, which can lead to leaks or compromised performance.

Compatibility and accessories

This model is compatible with monoblock centrifugal pumps from the NKM-G/NKP-G series with inlet sizes between DN 40 and DN 150. It also works with KDN series pumps and MCE frequency converters. For complete setup, ensure that the correct flanges and gaskets are available for the specific installation conditions.

Technical background for designers

The prefilter operates by capturing particulate matter in a stainless steel AISI 316 basket, which retains particles larger than the mesh aperture. The cast iron construction provides durability and resistance to thermal expansion, while the stainless steel basket offers corrosion resistance in aggressive environments. Integration into a system requires careful consideration of flow velocity and pressure drop across the prefilter, which affects overall system efficiency. The lifetime of the unit depends on regular cleaning and proper maintenance of the basket and sealing surfaces.

Service and operation

Periodic inspection of the basket is necessary to remove accumulated debris and maintain unrestricted flow. Check the integrity of the lid seal after prolonged operation or following system shutdowns. No scheduled service intervals are specified, but visual checks during routine maintenance are recommended to identify signs of wear or blockage.

Frequently asked questions

Can this prefilter be used with variable speed drives?
Yes, the unit is compatible with MCE frequency converters, making it suitable for systems requiring variable flow control.

What types of pumps are compatible with this model?
The prefilter works with monoblock centrifugal pumps from the NKM-G/NKP-G series and also with KDN series pumps.

How does the sealing mechanism work?
The lid is secured with three or four special closure bolts depending on the model, ensuring a tight seal against leakage under operational pressures.

Is the basket removable for cleaning?
Yes, the stainless steel basket can be removed for cleaning to restore full flow capacity and prevent clogging over time.