--- title: PFHB High Pressure Full Flow Bi-Directional Filter Assemblies Specifications description: PFHB high-pressure filter assemblies are ideal for applications where flow direction changes and fluid must be filtered with full flow in both directions. --- [![Donaldson Hy-Pro](https://www.hyprofiltration.com/hs-fs/hubfs/Donaldson%20Hy-Pro%20Logo_Blue.png?width=170&height=76&name=Donaldson%20Hy-Pro%20Logo_Blue.png) ![Donaldson Hy-Pro](https://www.hyprofiltration.com/hs-fs/hubfs/Donaldson%20Hy-Pro%20Logo_Blue.png?width=170&height=76&name=Donaldson%20Hy-Pro%20Logo_Blue.png) ](https://www.hyprofiltration.com?hsLang=en) [**](https://www.hyprofiltration.com/products/filter-assemblies/high-pressure-assemblies/pfhb-specifications#tmpmodule_1710871496765239) [![Distributors](https://no-cache.hubspot.com/cta/default/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4) [![eCatalog](https://no-cache.hubspot.com/cta/default/170326/4050f587-90b6-4151-8b5e-82d87ca58336.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/4050f587-90b6-4151-8b5e-82d87ca58336) ** ## PFHB High Pressure Full Flow Bi-Directional Filter Assemblies Hy-Pro’s PFHB high pressure filter assemblies are designed for applications where flow direction changes and fluid must be filtered with full flow in both directions. Protect both components and clean fluid that typically does not return to the reservoir. Ideal for steel mills, board plants, scrap yards, and concrete mixers. **Max Operating Pressure: 7252 psi (500 bar)**   [![Download Brochure](https://no-cache.hubspot.com/cta/default/170326/573487b2-9f3a-4721-8e6e-4620a273849d.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/573487b2-9f3a-4721-8e6e-4620a273849d) - PFHB Drawing - Bi-Directional Schematic ![PFHB drawing ](https://www.hyprofiltration.com/hubfs/Hy-Pro%20Website%20Images/PFHB/PFHB%20CATALOG%20INSTRUCTIONS.jpg) ![PFHB bi-directional schematic ](https://www.hyprofiltration.com/hubfs/Hy-Pro%20Website%20Images/PFHB/Artboard%202.jpg) Operating Temperature #### Fluid Temperature 30°F to 225°F (0°C to 105°C) #### Ambient Temperature -4°F to 140°F (-20C to 60C)  Operating Pressure 7252 psi (500 bar) ΔP Indicator Trigger 73 psid (5 bard) Element Collapse Rating #### HP419NL 450 psid (31.0 bard) max #### HP419Hl 3000 psid (206.8 bard) max #### HP419Cl 250 psid (17.2 bard) max materials of Construction #### Head Cast steel #### Bowl Extruded steel #### Interior Coating Phosphate #### Exterior Coating Industrial power coating Media Description #### M G8 Dualglass, our latest generation of DFE rated, high performance glass media for all hydraulic & lubrication fluids. βx[C] ≥ 4000 #### A G8 Dualglass high performance media combined with water removal scrim. βx[C] ≥ 4000 #### W Stainless steel wire mesh media βx[C] ≥ 2 (βx ≥ 2) Fluid Compatibility Biodegradable and mineral based fluids. For high water based or specified synthetics, consult factory. Replacement Elements ![PFHB replacement elements ](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Website%20Images/PFHB/Screen%20Shot%202018-06-28%20at%2010.28.38%20AM.png?width=1862&name=Screen%20Shot%202018-06-28%20at%2010.28.38%20AM.png "PFHB replacement elements ") ΔP Factor ![PFHB ΔP Factors](https://www.hyprofiltration.com/hs-fs/hubfs/PFHB_%CE%94P%20Factors.png?width=844&name=PFHB_%CE%94P%20Factors.png "PFHB ΔP Factors") Max flow rates and ΔP factors assume υ = 150 SUS, 32 cSt. See filter assembly sizing guideline for viscosity conversion formula on page 22 for viscosity change. Filter Sizing Chart ![PFHB filter sizing chart](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Website%20Images/All/page22-1.png?width=1273&name=page22-1.png "PFHB filter sizing chart") Max flow rates and ΔP factors assume υ = 150 SUS, 32 cSt. See filter assembly sizing guideline for viscosity conversion formula on page 22 for viscosity change. ## Have a Question for Donaldson Hy-Pro? [![Contact Us](https://no-cache.hubspot.com/cta/default/170326/82b6a151-2481-4e91-9cac-0d88a5679d18.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/82b6a151-2481-4e91-9cac-0d88a5679d18) [**](https://www.linkedin.com/company/hy-pro-filtration) [**](https://www.youtube.com/c/hyprofiltration) [![Donaldson Hy-Pro Logo](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo%202.png?width=130&height=58&name=Donaldson%20Hy-Pro%20Logo%202.png "Donaldson Hy-Pro Logo")](https://www.hyprofiltration.com?hsLang=en) Donaldson Hy-Pro 6810 Layton Road Anderson IN, 46011 | +1 (317) 849-3535 | info@hyprofiltration.com | All Rights Reserved 2026 ** [[fa icon="chevron-up"]](https://www.hyprofiltration.com/products/filter-assemblies/high-pressure-assemblies/pfhb-specifications#)