Pall HH8300 – High-flow filtration, coreless efficiency, lasting protection for industrial oil systems.

Product Overview

The housings are precision-manufactured from anodized aluminum, offering an excellent strength-to-weight ratio and 

outstanding corrosion resistance. This material choice not only extends service life in harsh industrial environments but

 also facilitates easier handling and installation compared to conventional steel-bodied filters. The anodized surface provides 

additional protection against moisture, chemicals, and atmospheric oxidation, making the HH8300 series equally reliable 

in indoor hydraulic stations and outdoor wind turbine gearbox applications.

At the heart of the HH8300 series lies its core mission: to efficiently remove solid particulates, colloidal sludge, 

and other harmful contaminants from industrial fluids. By maintaining system cleanliness to ISO-specified targets, 

these filters protect critical downstream components such as servo valves, bearings, pumps, and gear sets from abrasive wear, 

ensuring extended equipment life and uninterrupted production continuity.

Product Performance

The Pall Filter HH8300 Series delivers industry-leading flow capacity through its optimized high-flow hydraulic design.

 Single-unit configurations support nominal flow rates up to 1135 L/min, while dual-manifold arrangements can achieve

 combined flows up to 2270 L/min – a capacity range that comfortably accommodates the circulation needs of large-scale 

steel rolling mills, power generation turbine lube systems, and petrochemical process units without the need for multiple

 parallel filter banks.

Filtration efficiency is guaranteed by the integration of Ultipor III high-performance filter elements, which are globally 

recognized for their precision microglass fiber media. These elements achieve a filtration ratio of β≥1000 at rated micron sizes, 

capturing particles ranging from 1 to 100 μm with exceptional consistency. The advanced media structure ensures that even 

sub-micron contaminants are effectively retained, significantly reducing the risk of spool sticking, orifice plugging, and bearing 

surface scoring in sensitive hydraulic circuits.

A standout feature of the HH8300 series is its coreless element architecture, which eliminates the internal metal support tube 

found in conventional filters. This design innovation provides two distinct advantages: firstly, it increases the available void

 volume within the element, substantially boosting dirt-holding capacity and clogging resistance; secondly, it allows for more 

uniform flow distribution across the entire media surface, preventing localized saturation and extending element service life. 

Field data indicates that coreless elements can achieve up to 30% longer operational intervals under equivalent contamination 

challenges compared to cored designs, directly translating to reduced maintenance frequency and lower total ownership costs.

To safeguard continuous system operation, each HH8300 filter housing is equipped with a built-in full-flow bypass valve. 

This valve responds immediately when differential pressure exceeds the preset threshold – typically due to element loading

 or cold-start high-viscosity conditions – opening to allow unfiltered oil to bypass the element and maintain flow to downstream

 equipment. The rapid response characteristic prevents cavitation damage to pumps and ensures that production processes are 

never interrupted by filter blockage alone.

Technical Conditions

The Pall Filter HH8300 Series operates within a maximum working pressure of 28 bar (400 psi), with a fatigue-rated pressure of

 23 bar and burst pressure capacity of 145 bar, making it ideally suited for low-pressure industrial oil circuits where flow

 demand is high but pressure ceilings remain moderate. The robust anodized aluminum housing maintains structural integrity

 across a wide temperature spectrum: standard nitrile (NBR) seals support continuous operation from -43℃ to +107℃, while 

optional FKM fluororubber seals are available for applications involving elevated temperatures up to 120℃ or aggressive oil

 formulations with high sulfur or acidic content.

Versatile porting options include 1.5-inch, 2-inch, and 2.5-inch connections for single units, and a 3-inch port for dual-manifold

 configurations, ensuring compatibility with a broad range of piping standards. User-friendly maintenance features include a 

T-handle quick-remove cover that enables fast element changeouts without specialized tools, as well as integrated vent and 

drain ports for safe, clean servicing. O-ring seals are utilized throughout to guarantee leak-free performance, and optional

 differential pressure indicators (visual or electrical) can be fitted to provide real-time monitoring of element loading status, 

enabling condition-based maintenance strategies.

Scope of Application

The Pall Filter HH8300 Series finds extensive use across heavy industries including metallurgy (hydraulic stations for rolling 

mills and continuous casters), petrochemicals (lube oil circulation for compressors and turbines), power generation

 (wind turbine gearbox lubrication and transformer oil purification), as well as construction machinery and marine applications.

 It is ideally deployed in hydraulic power units, forced-feed lubrication systems, gearbox oil circuits (particularly in wind energy 

drivetrains), and industrial oil recirculation loops, handling a wide variety of media including hydraulic oils, lubricating oils, 

gear oils, and synthetic fluids.

FAQ – Frequently Asked Questions

Q1: What is the primary advantage of the coreless element design in the Pall Filter HH8300 Series?

A: The coreless design eliminates the internal metal support tube, increasing effective media volume and dirt-holding capacity 

by approximately 25–30%. This translates to longer element life, lower pressure drop, and reduced maintenance frequency 

compared to traditional cored elements.

Q2: Can the HH8300 series be used with synthetic or fire-resistant fluids?

A: Yes. The anodized aluminum housing is compatible with most synthetic hydraulic fluids and fire-resistant water-glycol or 

phosphate-ester types. However, please verify seal material compatibility – FKM seals are recommended for phosphate-ester 

and high-temperature applications, while NBR suits standard mineral oils and water-glycol fluids.

Q3: How do I select the correct micron rating for my application?

A: Selection depends on the cleanliness target of your system. For servo-valve controlled circuits, we recommend 3 μm or 5

 μm absolute ratings. For general lubrication systems, 10 μm to 25 μm ratings are typically sufficient. Consult your Pall 

representative for detailed application-specific recommendations.

Q4: What is the recommended replacement interval for HH8300 elements?

A: Replacement intervals depend on operating conditions and oil contamination levels. We recommend monitoring differential

 pressure and replacing elements when ΔP reaches 80% of the bypass valve setting (typically 2.4 bar for a 3 bar bypass). 

In clean applications, intervals may exceed 12 months; in heavily contaminated environments, more frequent changes may be

 required.

Q5: Is the HH8300 housing compatible with other brands' filter elements?

A: The HH8300 is engineered specifically for Pall Ultipor III elements to ensure optimal sealing, flow distribution, and filtration

 performance. While mechanical interchange may be possible, we strongly recommend using genuine Pall elements to 

guarantee performance specifications and avoid voiding warranty.

Q6: Can the HH8300 be installed in outdoor or high-humidity environments?

A: Absolutely. The anodized aluminum housing provides excellent corrosion resistance against moisture and atmospheric

 contaminants. We recommend fitting the optional weather cover for extended outdoor exposure and ensuring drain ports are 

positioned for easy moisture evacuation.

Q7: What differential pressure indicator options are available?

A: Both visual pop-up indicators and electrical switch indicators (24V DC or 220V AC) are available as field-installable accessories,

 allowing for remote monitoring and integration with plant control systems.