High-pressure filters
Produkty z kategorii
Universal high-pressure hydraulic filters for the pressure line (280–420 bar)
High-pressure filters for hydraulic systems (pressure filters mounted directly on the pressure line downstream of the main pump, including ductile iron and forged steel housings of the FHP, FHM, FMM series and updated glass microfiber elements) are advanced filtration devices designed to protect the most sensitive and expensive components of power hydraulics. Installed on the high-pressure line, just before proportional valves, servo valves, valve blocks, and working actuators, they effectively stop fine solid contaminants, dust, and filings generated during pump operation. This category includes a wide range of complete filters, heads, and replaceable filter elements adapted to work under pressures from 280 bar to 420 bar and nominal flows in the range of 10 l/min to over 450 l/min (for mineral and synthetic oils with a viscosity class of HL/HLP 30 cSt). The availability of variants with a built-in by-pass valve (e.g., 6 bar) and versions without a by-pass (with high collapse resistance elements Δp = 210 bar) allows for the perfect matching of filtration to the rigorous requirements of modern construction, agricultural, and forestry machinery, as well as advanced stationary industrial lines.
Application and technical characteristics of high-pressure filters
High-pressure hydraulic filters are installed in the pressure zone of the circuit, where the working fluid reaches maximum pressure and flow velocity. Their main task is to capture abrasive microparticles of a few microns in size, preventing spool jamming in valves and seal degradation.
- Armored housing construction (280–420 bar): Massive ductile iron heads and forged steel bowls ensure full resistance to dynamic shocks and high working pressures.
- High filtration efficiency (3 µm, 6 µm, 10 µm, 25 µm): Multi-layer glass microfiber elements are characterized by a very high beta ratio (βx ≥ 200) and huge dirt-holding capacity.
- Protection of servo valves and proportional valves: A guarantee of maintaining oil cleanliness class according to ISO 4406 (e.g., 16/14/13) protects precision control edges from seizing.
- By-pass and non-bypass options: Choice between traditional by-pass protection and absolute full-flow filtration with elements resistant up to 210 bar.
- Continuous element clogging control: Dedicated connection ports allow for easy mounting of an optical (visual) or electrical differential indicator.
Why choose high-pressure filters at the HYDRON store?
The HYDRON store offers complete high-pressure filters manufactured in accordance with the highest ISO 9001 quality standards and pressure directive requirements. The offered solutions exhibit 100% mechanical tightness and are fully compatible with standard mineral, synthetic, and fire-resistant hydraulic fluids. In engineering practice, pressure filters constitute a safety policy for the entire system – their proper selection eliminates sudden production downtimes and extensive failures of pumps and distributors. For the comprehensive construction and professional service of the pressure line, we recommend selecting other compatible components from our offer, such as efficient piston hydraulic pumps, flexible high-pressure hydraulic hoses, precise hydraulic directional control valves and reliable 700 bar hydraulic valves.
Technical specification
Technical parameter | Value / Description |
|---|---|
Product category | High-pressure filters (pressure line filters for hydraulic systems) |
Nominal flow range | from 10 l/min to 450+ l/min (for oil with 30 cSt viscosity / HL 30 class) |
Maximum working pressure | from 280 bar to 420 bar (28 – 42 MPa / 6000 PSI) |
Housing construction materials | Ductile iron head, hardened forged steel bowl |
By-pass valve options | With bypass valve (e.g., 6 bar) or without bypass valve (element resistance Δp = 210 bar) |
Available filtration ratings | 3 µm, 6 µm, 10 µm, 25 µm (glass microfiber / steel mesh) |
Element status signaling | Ports for optical (visual) or electrical differential pressure indicator (5 bar) |
Compatibility and filter series | MP Filtri FHP, FHM, FMM, FMX, Hydac, Parker, AHC, Hydrolider |
Frequently Asked Questions (FAQ)
How does a high-pressure filter differ from a return filter?
A high-pressure filter is mounted on the pressure line behind the pump and has a very durable steel housing (280–420 bar) and denser glass microfiber elements. A return filter is mounted on the return line to the tank at low working pressure (up to 12 bar).
When should high-pressure filters without a by-pass valve be used?
Filters without a by-pass valve are used in systems with proportional valves and servo valves, where unfiltered oil flow cannot be allowed. They require the use of elements with increased collapse resistance (Δp = 210 bar).
Why are glass microfiber elements used in pressure filters?
Glass microfiber elements (Inorganic Microfiber) are characterized by a very high filtration ratio (βx ≥ 200), high absorption capacity, and resistance to pressure surges, ensuring the highest cleanliness class of the working fluid.
How to select high-pressure filter capacity for a system?
The nominal flow of the filter should be selected taking into account the maximum pump flow rate, oil viscosity, and start-up temperature. It is recommended to maintain a flow capacity margin of 20–30% above the nominal pump output.