High Pressure In-Line Hydraulic Filters

Since 1998, Norman Filter Company has been a family-owned manufacturer of precision filtration solutions for the world's most demanding applications. Our full line of high-pressure in-line hydraulic filters is engineered for applications where space, weight, and performance cannot be compromised. 

From aerospace ground support and manned space flight to oil and gas, hydrogen markets, and defense, NFC's AS9100-D-certified in-line filter housings perform where standard solutions fall short.

Why Choose NFC In-Line Filters?

Where T-type filter assemblies demand more footprint, an in-line hydraulic filter offers a compact alternative without sacrificing flow capacity or pressure capability. Our in-line designs consistently offer a higher flow rate per body size, making them a practical choice for systems with tight envelope constraints (including cryogenic service applications where dimensional efficiency is critical).

Every high-pressure hydraulic filter housing NFC produces is manufactured in-house using all-welded construction and a proprietary process field-proven across the most demanding environments on earth and in orbit. As a family-owned business, we bring a level of direct engineering involvement that larger catalog suppliers can't match. Whether you need a standard configuration or a fully custom assembly, NFC's engineering team works with you from design through qualification. 

Key capabilities include:

• AS1098 seal cuts in male fittings for aerospace ground support and flight applications

• ASME Section VIII, Division 1 / B31.3 compliant designs available (consult engineering for pressure rating)

• Custom cantilever element-supported designs for flight and manned space flight hardware

• Operating range: 0–30,000 PSI | -425°F to 400°F* | 0–40 GPM (3,000 SCFM)

• Threaded inlet/outlet ports: 1/4" to 1"

• Micron ratings: 0.2µm to 1,000µm across multiple media types and collapse ratings

For operating temperatures above 400°F, consult the factory specialists.

Materials

NFC's hydraulic in-line filter housings are available in:

• Anodized aluminum

• 300 series stainless steel

• 17-4 PH stainless steel (H900 condition)

Additional exotic materials are available through our engineered solutions program for applications requiring Nickel 200, titanium, or other specialty alloys.

Frequently Asked Questions About In-Line High-Pressure Hydraulic Filters

What is the difference between a high-pressure in-line filter and a T-type filter?

In-line hydraulic filters mount directly in the fluid line with inlet and outlet ports on opposite ends of the housing, whereas T-type (tee-type) assemblies have a perpendicular port arrangement. In-line configurations typically offer a weight and space advantage and a higher flow rate per body size, making them common in aerospace and systems with tight envelope constraints. T-type assemblies are often preferred when accessibility for element servicing is a priority. 

How do I determine the right filter for my system? 

The key parameters are operating pressure, flow rate, fluid type, temperature range, port size, and required micron rating. NFC's engineering team offers pressure drop and flow calculations and can assist with filter selection and sizing. Use the contact form or request a quote to get started.

Can NFC build a custom in-line filter housing for my application?

Yes. NFC specializes in custom-engineered filter solutions, including non-standard port sizes, exotic materials, specialty seal configurations, manifold integration, and B31.3- or ASME-compliant pressure vessel designs. Submit a quote request with your application details, and an engineer will follow up.

Additional Applications

Norman Filters High-Pressure Inline Hydraulic Filters are used in a variety of industries:

• Hydrogen markets
• Processed chemicals
• Aerospace
• Military/Marine
• Polymer industry
• Pharmaceutical
• Oil & gas
• Alternative power

*For operating temps above 400°F, consult the factory specialists.