Selection of Alternative HYDAC Filter Elements for Different Working Conditions

Selection of Alternative HYDAC Filter Elements for Different Working Conditions

Introduction

Hydraulic and lubrication systems operate in vastly diverse working conditions, and no single type of alternative HYDAC filter element can adapt to all scenarios. The correct selection of replacement elements must fully combine operating pressure, ambient temperature, fluid medium, contamination level, equipment precision requirements and running modes. High-quality alternative products follow ISO 16889 filtration standards and retain the structural dimensions of original HYDAC elements, which ensures direct installation and interchangeability. Based on typical industrial working conditions, this article classifies common operating environments, analyzes corresponding selection criteria for alternative filter elements, matches suitable filter media, β-value grades, sealing materials and structural types, and summarizes tabulated guidelines for practical on-site application. It aims to help users avoid improper selection, prevent system failures caused by mismatched filters, and give full play to the cost-performance advantages of alternative HYDAC filter elements.

1. Classification of Core Working Condition Parameters for Selection

Before selecting filter elements, it is necessary to clarify six key parameters that determine product matching, which are also the core evaluation indicators for alternative HYDAC filters. First, system working pressure, which is divided into low pressure, medium pressure, high pressure and ultra-high pressure, directly determining the pressure resistance grade of the filter material and framework. Second, operating temperature, including normal temperature, high temperature, low temperature and alternating temperature environments, affecting the stability of filter media and sealing rings. Third, fluid medium, covering mineral hydraulic oil, synthetic oil, water-glycol, emulsified liquid and corrosive chemical fluids, which puts forward different requirements for chemical compatibility of materials. Fourth, contamination degree, divided into light pollution, medium pollution and heavy pollution, deciding the dirt-holding capacity and structural form of filter elements. Fifth, filtration precision, corresponding to different β-value standards, matching the clearance of hydraulic components such as servo valves and plunger pumps. Sixth, operation mode, including intermittent operation, long-term continuous operation and mobile working conditions with strong vibration, which relates to the fatigue resistance and service life of filter elements.

All alternative HYDAC filter elements are designed according to original installation dimensions, so interface matching is basically guaranteed. The focus of selection is concentrated on filter media, β-value, seal material and pressure resistance grade. In the following chapters, we will carry out targeted selection analysis for each typical working condition.

2. Selection for Normal Temperature & Medium Pressure Conventional Working Conditions

This is the most widely applied scenario in general industrial production, covering standard machine tools, ordinary injection molding machines, general assembly equipment and conventional industrial hydraulic stations.

2.1 Working Condition Characteristics

The system working pressure ranges from 70 bar to 210 bar, which belongs to medium pressure. The operating temperature is stably kept between 10°C and 80°C, with no extreme temperature fluctuation. The working medium is conventional mineral hydraulic oil, and the internal contamination of the fluid is at a medium level, with regular oil maintenance and external dust isolation. The equipment runs stably with slight vibration, and most of the hydraulic components are ordinary directional valves and gear pumps, with medium precision requirements. The required fluid cleanliness is NAS 6 to NAS 7.

2.2 Selection Rules for Alternative HYDAC Filter Elements

β-value grade: Choose elements with β₅ ≥ 200. This grade reaches 99.5% filtration efficiency for 5μm particles, which fully meets the protection demand of medium-precision hydraulic components and is the mainstream standard for conventional industrial systems.

Filter media: Prioritize high-quality multi-layer glass fiber media, the equivalent model of HYDAC BN series. Glass fiber features stable filtration efficiency, moderate dirt-holding capacity and cost advantages, perfectly matching medium pollution environments. For equipment with slightly higher contamination, composite gradient filter media can be selected. Its outer coarse layer intercepts large particles and the inner fine layer ensures filtration precision, effectively extending the service cycle.

Sealing material: Adopt NBR (nitrile rubber) seals. NBR has excellent compatibility with mineral oil, stable performance within -30°C to 100°C, low cost and long service life under normal temperature conditions.

Structural type: Standard folded structure with conventional metal support frame. It can withstand medium pressure and slight vibration without deformation or damage.

Recommended models: Conventional D series such as 0110D010BN4HC, 0240D020BN4HC, which are universal alternative models for HYDAC and have sufficient inventory in the market.

3. Selection for High Temperature Working Conditions

Typical application scenarios include metallurgical equipment, die-casting machinery, thermal power plant lubrication systems and industrial furnaces. These devices are accompanied by high ambient temperature or high-temperature working media.

3.1 Working Condition Characteristics

The fluid temperature or ambient temperature is continuously above 80°C, and the peak temperature can reach 120°C to 200°C. The system pressure is mostly medium and high pressure (100 bar to 315 bar). Some systems use water-glycol fire-resistant fluid instead of mineral oil. High temperature will accelerate the aging of ordinary filter paper and rubber seals, and easily cause seal failure and filter media damage. The fluid is prone to generate oil sludge at high temperature, leading to increased internal contamination.

3.2 Selection Rules for Alternative HYDAC Filter Elements

β-value grade: Select β₅ ≥ 200 or β₁₀ ≥ 200 according to component precision. For high-temperature lubrication systems of power equipment, β₃ ≥ 200 is recommended to ensure high cleanliness of lubricating oil.

Filter media: For continuous temperature below 120°C, still choose high-temperature resistant glass fiber media with high-temperature aging treatment. For long-term working temperature above 120°C, replace with 316L sintered stainless steel mesh media (equivalent to HYDAC V/W series). Metal media will not soften or deform at high temperature up to 400°C, with outstanding thermal stability.

Sealing material: Abandon ordinary NBR seals and use FKM (fluorine rubber) seals. FKM can work stably for a long time at -20°C to 200°C, resisting aging and corrosion caused by high-temperature oil and water-glycol medium.

Structural type: Reinforced thickened support frame to prevent structural deformation under high temperature and high pressure. For systems with a large amount of oil sludge, increase the folding area to improve dirt-holding capacity.

Recommended models: High-temperature customized versions of 1300R series and high-pressure stainless steel mesh elements.