O-ring face seal SAE J1453 fittings are popular in 
hydraulic lines onboard off road vehicles such as tractors, combines and other heavy equipment used in construction. Due to the frequent vibration and actuation of components in off-road vehicles, it is extremely important to reduce or eliminate the number of potential leak points and incidences of leakage. The SAE J1453 standard for ORFS fittings covers dimensions, threads, fitting and O-ring materials, and performance requirements of for use in hydraulic applications, as well as the interface of the O-ring face and nut portion of hose stem assembly.
A common, yet critical application for SAE J1453 ORFS fittings is with turbine flow meters in hydraulic fluid applications. A turbine flow meter is used for volumetric total flow and flow rate measurement. When the fluid flows through the meter it moves turbine blades that are free to rotate about an axis along the center line of the turbine housing, monitoring flow rate. Turbine flow meters play an important role in many hydraulic and pneumatic applications, including:
- Auxiliary systems in turbine hydraulic controls, liquid fuel control systems,
jacking/leveling and lube oil skids
Chemical plants - Electrohydraulic controls (EHC)
- General industrial equipment
- Generators and transformers
- Hydraulic fracturing operations
- Lube auxiliary systems in hydroelectric plants
- Off-road, construction and agricultural equipment
- Water treatment equipment
- Wellheads in oil & gas
- Wind power turbines
Flow meters that incorporate NPT end-fittings require adapters and can experience a number of leak points. However, units utilizing O-ring face seal fittings do not require adapters, need less space for meter installation and ensure fewer possible leak points.
Another important factor in many applications that use ORFS fittings versus traditional metal-seal fittings is that manufacturers can extend warranty periods in equipment because of the reduction of possible leak points.
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Primary Sources Include:
- Flow Technology
- Hydraulics & Pneumatics
- Mobile Hydraulic Tips
- OEM Off-Highway
- Pumps & Systems
- SAE International
- Windpower Engineering & Development
