In-line return filters
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In-line return filters 325 l/min universal hydraulic filters for return systems
In-line return filters with a flow of up to 325 l/min (complete Spin-On type canister filters of the AMF 601 CV series and filters with a double canister) are advanced filtration devices designed for continuous and efficient purification of hydraulic oil in large-scale power systems. Mounted directly on return lines or oil tank walls, they effectively capture mechanical impurities, metal shavings and deposits formed during the operation of pumps, motors and hydraulic cylinders. This category includes high-performance complete filters, heads and replaceable canister inserts adapted to work at a working pressure of up to 12 bar and a nominal flow of 325 l/min (for oil with a density of 30 cSt / HL 30 class). The integrated bypass valve with an opening pressure of 1,7 bar protects the structure of the filter elements from bursting during the cold start of the installation and during heavy clogging of the filter mesh. In-line return filters 325 l/min are the most important solution ensuring stable operation and long service life of construction, agricultural, forestry machines and extensive stationary industrial power units.
Application and technical characteristics of in-line return filters 325 l/min
High-capacity hydraulic return filters 325 l/min find common application in power hydraulic circuits with a high flow rate of the working medium. Their primary task is to accurately filter the oil returning to the main tank, which prevents the recirculation of dangerous abrasive particles throughout the hydraulic main line.
- Maximum nominal flow up to 325 l/min: Enables efficient and trouble-free filtering of large oil streams in high-performance mobile and stationary hydraulic systems.
- Element filtration accuracy (25 µm): Cellulose and synthetic elements stop fine mechanical impurities, guaranteeing the maintenance of the appropriate cleanliness class of the working fluid.
- Safe by-pass valve (1,7 bar): The built-in differential system opens a direct bypass in the event of the element blocking, protecting the canister and the installation from overpressure damage.
- Standard of normalized threaded connections: Solid aluminum-steel housings guarantee a secure connection with return lines and high resistance to bursting pressures up to 25 bar.
- Fast Spin-On service: The design with screw-on canisters (e.g. AMF 601 CV AHC or Sofima) allows for instant and tool-free replacement of consumable elements.
Why choose in-line return filters 325 l/min at the HYDRON store?
The AMF 601 series in-line return filters offered in the HYDRON store are manufactured in accordance with strict ISO 9001 criteria, which translates to their reliability in the most difficult working conditions. They show full resistance to the action of mineral and synthetic oils. Good engineering practices dictate selecting hydraulic filters with a capacity reserve about 30–40% greater than the output of the supply pump. This is dictated by the fact that negative ambient temperatures and high viscosity of cold oil can lower the actual flow through the filter element. For the comprehensive construction and service of the power hydraulic system, we recommend selecting other compatible products from our offer, such as flexible hydraulic hoses, matching hose fittings, efficient hydraulic pumps and extensive hydraulic control valves.
Technical specification
Technical parameter | Value / Description |
|---|---|
Product category | In-line return filters (flow up to 325 l/min / AMF 601 CV series) |
Maximum nominal flow | 325 l/min (for oil with a viscosity of 30 cSt / HL 30 class) |
Maximum working pressure | 12 bar (1,2 MPa) |
Housing bursting pressure | 25 bar (2,5 MPa) |
By-pass valve opening pressure | 1,7 bar (1,75 bar) |
Element filtration accuracy | 25 µm (microns) – replaceable Spin-On canister element |
Mounting position in the installation | Hydraulic system return line (before the tank inlet) |
Compatibility and equivalents | AMF 601 CV AHC, AMF 601 CV Sofima, MP Filtri MPS 300 / MPS 350 |
Frequently Asked Questions (FAQ)
Where are 325 l/min in-line return filters used?
325 l/min in-line return filters are mounted on the return line of high-flow power hydraulic systems, directly before the oil outlet to the main tank.
What function does the by-pass valve perform in the AMF 601 CV filter?
The by-pass valve opens an emergency bypass of the filter element after exceeding a differential pressure of 1,7 bar. This protects the filter canister from bursting during a cold start or when the mesh is very heavily soiled.
Why should a filter with a capacity reserve be chosen?
Low ambient temperature causes an increase in oil density, which raises flow resistance through the element by up to 40%. An appropriate capacity reserve prevents unnecessary opening of the bypass valve and guarantees continuous filtration.
How often should the canister element be replaced in the 325 l/min return filter?
The filter element should be replaced periodically during technical inspections (usually every 500–1000 operating hours) or immediately after indicating contamination by an optical or electrical indicator.