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Help CenterGenuine HY-PRO Filter Element
Product Spotlights
Graded-density G8 dual glass fiber composite structure provides outstanding deep dirt holding capacity, extending service cycle and lowering maintenance frequency.
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1 Product Overview
Genuine HY-PRO filter element is a high-performance consumable for hydraulic, lubrication and fuel purification systems developed by professional fluid contamination control brand HY-PRO. It is widely matched with industrial hydraulic stations, wind turbine pitch & yaw systems, metallurgical rolling mills, heavy construction machinery, marine hydraulic equipment and steam turbine lubrication systems. During continuous operation of hydraulic and lubrication systems, metal particles, rust oxides and rubber debris are constantly generated inside oil fluid. Meanwhile, moisture and dust invade oil circuits through tank breathers and shaft seals. Tiny hard particles circulate with medium and continuously scour high-precision matching components such as plungers and valve spools, resulting in increased internal leakage, delayed response, pressure fluctuation and abnormal noise. Free water inside medium accelerates oil oxidation and produces sludge, which leads to valve sticking and pump wear.
Most conventional ordinary filter elements adopt precision calibrated only under static laboratory conditions. Their filtration efficiency declines rapidly under real working conditions with flow fluctuation, vibration and alternating pressure. The core advantage of HY-PRO filter elements lies in DFE Dynamic Filter Efficiency technology. The test environment is closer to actual equipment operation, so it can maintain rated filtration precision for a long time under continuously disturbed oil circuits, stabilize ISO 4406 cleanliness level and reduce wear risk of precision hydraulic components fundamentally.
HY-PRO filter elements own a huge interchange model system, covering pressure line filter elements, return line filter elements, suction filter elements, bypass filter elements and offline fine filter elements. Filtration precision includes 1μm, 3μm, 6μm, 12μm and 25μm. Three main product lines are launched for different working conditions: general particle filtration type, water-oil separation type, high temperature corrosion-resistant metal fiber type, adapting to low, medium and high-pressure oil circuits. Products are massively applied in onshore heavy equipment, offshore wind power platforms, continuous metallurgical production lines, power steam turbines and mining hydraulic supports which cannot stop arbitrarily. Stable fluid purification reduces sudden shutdown risks and high maintenance costs.
Many low-cost generic alternative filter elements on the market have obvious defects including rough pleating technology, lack of gradient layered structure, insufficient framework compression strength and uncontrolled seal dimensional tolerance. After installation, they quickly reach dirt saturation and cause contaminant bypass, leading to irreversible damage of expensive servo valves and piston pumps within a short period. Genuine HY-PRO filter elements implement complete original production control system. The whole process including raw material screening, automatic pleating, high-temperature curing bonding, differential pressure sampling test and tightness test is standardized. Performance indicators of every filter element comply with original design specifications. Long-term industrial cases prove that qualified HY-PRO filter elements greatly extend overhaul cycle of hydraulic components, cut spare parts consumption and reduce economic losses caused by production shutdown.
2 Structure Composition
Complete genuine HY-PRO filter element consists of gradient filter layer, inner supporting mesh, outer diversion protective mesh, upper & lower metal end caps, built-in pressure-bearing central framework and elastic sealing gasket.The mainstream G8 dual graded-density glass fiber medium forms the core filtration layer. Randomly intertwined ultra-fine glass fibers build three-dimensional pore structure to realize graded filtration: large particles intercepted on outer layer, tiny pollutants captured inside inner layers. Compared with single-layer homogeneous medium, gradient structure holds contaminants layer by layer and avoids rapid blockage of surface pores, significantly lifting overall dirt holding capacity. Automatic precision pleating machine controls uniform folding height and spacing to maximize effective filtration area. Under the same outer diameter, larger effective filtration area brings smoother medium flow velocity, lower initial differential pressure and higher total pollutant holding capacity to extend replacement cycle.
Built-in central pressure-bearing framework adopts perforated metal cylinder or high-strength composite supporting barrel to resist forward and reverse differential pressure impact. In case of instantaneous water hammer shock and periodic flow pulsation in hydraulic systems, the framework firmly supports filter medium and prevents inward collapse, fold tearing and filtration failure. Stamped flat metal end caps connect with filter medium by oil-resistant two-component high-temperature curing adhesive. No softening, degumming or cracking occurs after long-term immersion in mineral hydraulic oil, water-glycol and phosphate ester fire-resistant fluid.
Two mainstream sealing options are available: nitrile rubber gaskets fit conventional mineral anti-wear hydraulic oil with cost advantage; fluorocarbon rubber gaskets are designed for high temperature medium, synthetic hydraulic oil and aviation fire-resistant fluid with excellent anti-swelling, anti-aging and anti-corrosion property. Sealing rings are produced strictly according to original drawing tolerances. After assembly, they fit tightly with inner wall of filter housing to eliminate gap channels and prevent contaminated unfiltered fluid bypassing the element into downstream hydraulic circuits.
For water-containing oil medium, optional composite water removal medium interlayer captures free water and emulsified water while filtering solid particles, realizing dual functions of solid-liquid separation and water-oil separation to solve particle pollution and water ingress problems simultaneously.
3 Working Principle
During normal operation of hydraulic systems, oil carrying solid impurities and moisture enters filter housing and flows through multi-layer gradient medium from outer side to inner side of filter element (partial customized models flow inward to outward). Solid particle contaminants are trapped on medium surface and inner pores; clean oil passes through central channel and transports continuously to hydraulic actuators and lubricating bearing assemblies. With continuous operation, accumulated impurities gradually raise differential pressure between inside and outside of filter element. When differential pressure reaches preset alarm value or maximum working differential pressure, the filter element is nearly saturated and requires timely shutdown replacement.
Most filters matched with HY-PRO elements can install differential pressure transmitters and indicators to monitor pressure change online. Electric signals will be triggered once reaching warning threshold. Operators can arrange maintenance window combined with production schedule to avoid insufficient oil supply caused by fully blocked filter element. When filter element is severely blocked and differential pressure exceeds limit, built-in bypass valve of filter opens automatically. Fluid circulates bypassing filter element to guarantee temporary continuous operation. At this moment, oil loses purification protection, so filter element replacement must be finished as soon as possible to prevent massive contaminants impacting high-precision valve assemblies.
The graded interception logic of DFE gradient medium differs from ordinary filter paper: large impurities stay on outer surface, tiny micron particles are captured in inner pores. Surface flow pores will not be blocked quickly, and full medium thickness can be utilized to hold contaminants. This is the core technical advantage that HY-PRO filter elements own stronger dirt holding capacity than copied low-cost elements. Low-quality single-layer filter paper only relies on surface interception. Surface pores close rapidly, differential pressure rises sharply and service life is shortened greatly, unable to meet long-time continuous production conditions.
4 Main Media Types & Technical Advantages
According to working conditions, HY-PRO filter elements adopt four mainstream media systems covering most industrial fluid purification scenarios.Type 1: G8 dual graded glass fiber medium, standard universal version with widest application range. Stable three-dimensional pores formed by intertwined ultra-fine glass fibers deliver excellent micron capture effect against oxide scale, metal wear particles and dust. Stable fiber structure rarely sheds fragments during operation without secondary oil circuit pollution. Suitable for most industrial hydraulic and lubrication systems.Type 2: Dynafuzz stainless steel fiber medium for high-temperature medium, corrosive fluid and phosphate ester fire-resistant fluid, supporting cleaning and regeneration. Metal fiber owns outstanding resistance to high temperature, chemical corrosion and extreme differential pressure impact, widely used in power generation equipment and aviation special hydraulic equipment.Type 3: Composite water removal glass fiber medium integrated with hydrophilic interlayer. It captures solid particles and absorbs free water & emulsified water inside oil simultaneously, suitable for outdoor construction machinery vulnerable to water ingress and steam turbine lubrication systems.Type 4: Stainless steel woven mesh medium for pre-coarse filtration of high-viscosity fluid to trap large-size impurities, usually matched with fine filtration system as primary protection filter.
All media pass fluid compatibility test before delivery, compatible with all commercial hydraulic oil and lubricating oil without dissolution or impurity precipitation pollution. Automatic pleating production line guarantees uniform folding spacing without local extrusion deformation, ensuring even medium flow across all filtration zones. Automatic constant-temperature bonding avoids virtual adhesion and partial leakage gaps caused by manual assembly.
5 Key Technical Parameters
5.1 Filtration Precision: Evaluated by dynamic DFE beta value, mainstream specification βx[C]≥4000, which means capture efficiency of corresponding micron particles ≥99.75%, fitting real dynamic equipment operation conditions. Most low-cost filter elements only mark nominal precision without dynamic beta index, leading to obvious efficiency decline under load fluctuation. Optional precision: 1μm, 3μm, 6μm, 12μm, 25μm.5.2 Working Differential Pressure: New filter element maintains low initial differential pressure; maximum allowable differential pressure differs by model. Pressure line filter elements bear higher differential pressure while return and suction filters have lower limits. Long-term operation exceeding rated differential pressure brings risk of medium tearing and permanent failure.5.3 Working Temperature: Standard version applicable oil temperature range: -25℃ ~ +100℃; fluorocarbon rubber sealing version supports short-time peak high temperature. Continuous long-time over-temperature accelerates aging of seals and filter media.5.4 Applicable Medium: Conventional mineral HLP, HM anti-wear hydraulic oil; water-glycol medium; phosphate ester fire-resistant hydraulic oil; diesel oil and lubricating oil. Special synthetic fluid is available with matched sealing structure. Strong acid and strong alkaline corrosive medium is prohibited.5.5 Installation Type: Standard thread and flange interface matching HY-PRO filter housing. Identical installation dimensions support direct original replacement without modifying mounting brackets and on-site pipelines.5.6 Test Standards: ISO 2941 filter burst resistance test; ISO 2942 structural integrity; ISO 2943 fluid compatibility; ISO 16889 multi-pass filtration performance test.
6 Application Fields
Wind Power Industry: Pitch hydraulic system, yaw lubrication hydraulic station and gearbox lubricating oil bypass filtration of wind turbine generators.Metallurgy Industry: Oil purification of hot rolling lines, cold rolling units, continuous casting equipment and hydraulic servo systems.Plastic Machinery: Pressure and return filtration of hydraulic power units for large injection molding machines and extruders.Construction Machinery: Main hydraulic system filtration for excavators, shield machines, road rollers and loaders.Power & Energy: Lubrication system, hydraulic speed control system and hydraulic test bench of steam turbine units.Machine Tool Industry: Hydraulic circuit fine filtration for CNC machining centers, forging machines and die casting machines.Shipbuilding Industry: Deck machinery, steering gear hydraulic devices and auxiliary engine lubrication systems.Mining Equipment: Underground hydraulic supports and crusher lubrication hydraulic circulation systems.General Industry: Complete hydraulic equipment matched with imported hydraulic valve groups, piston pumps and servo systems.
7 Installation & Operation Specifications
7.1 Pre-installation Preparation: Shut down equipment and fully release internal pressure of hydraulic system. Do not disassemble filter under pressure to prevent oil ejection safety accidents. Clean dust outside filter housing to avoid external impurities falling into cylinder and polluting clean oil circuit during assembly.7.2 Disassembly Steps: Open filter end cap slowly, take out waste filter element and clean sediment and metal impurities at cylinder bottom. Clean inner cylinder with clean hydraulic oil from the same system; ordinary cotton yarn wiping is forbidden, because fiber residue will form new system pollution sources.7.3 New Element Inspection: Unpack and check appearance of new HY-PRO filter element. Confirm no collision deformation, distorted end cap and damaged sealing ring. Verify model, precision and sealing material match working requirements.7.4 Assembly Process: Place sealing gasket stably into positioning slot on filter element, insert vertically into cylinder. Do not squeeze or twist forcibly. Tighten end cap bolts evenly in diagonal sequence to avoid sealing offset and leakage caused by unilateral stress.7.5 No-load Trial Run: Start hydraulic system without load after assembly, continuously check external leakage of filter housing and monitor stable differential pressure alarm value of control cabinet. Conduct re-inspection after continuous operation for 30 minutes. Installation is qualified without leakage and stable differential pressure.
8 Maintenance Rules & Common Fault Analysis
8.1 Standard Maintenance Cycle
Maintenance cycle depends on on-site environment and initial fluid cleanliness. Clean indoor closed environment: monitor differential pressure after 2000~3500 running hours. Outdoor dusty construction machinery and mining equipment detect differential pressure every 800~1500 hours. Replace filter immediately once differential pressure triggers alarm instead of delayed usage. Even without alarm, regularly replacement is recommended for long-time continuous operation equipment. Long-term pollutant absorption leads to permanent pore blockage and reduces flow efficiency.
8.2 Typical Fault Analysis
Fault 1: Persistent oil leakage at filter end cap. Causes: aging or damaged sealing ring, offset installation of gasket, uneven bolt tightening force. Solutions: replace new original specification seal and lock bolts evenly in diagonal sequence.Fault 2: Differential pressure rises rapidly after short operation. Causes: heavily contaminated hydraulic oil, continuous dust ingress caused by failed tank seal, massive metal debris generated by worn pipeline components. Eliminate system pollution sources, replace filter element and test oil contamination level.Fault 3: Frequent wear and aggravated internal leakage of hydraulic servo components. Key inspection points: filter failure and contaminant bypass. Verify authenticity of filter element and confirm low-precision copied products. Replace qualified HY-PRO filter element and test oil ISO cleanliness.Fault 4: Filter element reaches maximum differential pressure within short service time. Check direction: pipeline rust, water ingress from tank, impurities brought by cooler leakage, eliminate continuous external pollution sources completely.
9 Selection & Purchasing Guide
A large number of copied filter elements circulate on the market with similar appearance but huge gaps in medium technology and filtration performance. Genuine HY-PRO filter elements carry clear printed marks on body, complete model code and batch information on outer package; copied products own fuzzy printing without formal traceability batch codes.Prioritize complete verification of original model code and strictly refer to official HY-PRO sample parameters. Do not select products only depending on overall dimensions. Products with identical sizes may have completely different medium precision, dirt holding capacity and pressure resistance. Long-term use of low-cost copied filter elements brings higher pump and servo valve maintenance cost than price difference of filter elements.Choose suppliers with formal supply qualification. Check product marks after delivery and keep purchasing documents. Regularly take oil samples to detect ISO 4406 contamination grade and verify actual purification effect of filter element through data.Select sealing material according to medium: NBR nitrile seal for conventional mineral hydraulic oil; FKM fluorocarbon seal directly for high temperature and synthetic fire-resistant medium to avoid seal swelling failure risk.
10 Product Advantages Summary
Genuine HY-PRO filter elements adopt core DFE dynamic filtration technology, and performance parameters fit real dynamic working conditions of industrial hydraulic systems. Graded composite medium combines high filtration efficiency and large dirt holding capacity. Stable sealing structure prevents contaminant bypass and fully protects all kinds of high-precision hydraulic and lubrication components. Complete standardized model series owns excellent interchange compatibility with most mainstream imported hydraulic equipment. Regular filter replacement maintains long-term stable ISO cleanliness level of oil fluid, reduces sudden equipment failures, extends overall overhaul cycle and lowers comprehensive operation and maintenance cost for enterprises.For key production scenarios such as continuous metallurgical production lines, offshore wind power platforms, heavy construction machinery and power steam turbines which cannot stop arbitrarily, high-performance HY-PRO filter elements are core vulnerable spare parts to guarantee stable continuous production. Long-term industrial practice proves that systematic fluid purification scheme matched with genuine HY-PRO filter elements significantly extends service life of hydraulic piston pumps, servo valves and hydraulic motors, and greatly reduces spare parts consumption and economic losses caused by production shutdown.
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