What’s ISO 8434-3 O-ring face seal connectors

The ISO 8434-3 standard, titled “Metallic Tube Connections for Fluid Power and General Use – Part 3: O-ring Face Seal Connectors,” was first released in 1995. This initial edition was prepared by the Technical Committee ISO/TC 131, Fluid Power Systems, Subcommittee SC 4, Connectors and Similar Products and Components. The current valid version of the standard is ISO 8434-3:2005.

This standard originated from SAE J1453, which was issued in 1987 and focused on fittings with O-ring face seals, commonly known as ORFS fittings. The ORFS connectors introduced by this standard gained widespread usage in the United States.

What content does ISO 8434-3 specify?

ISO 8434-3 specifies the general and dimensional criteria governing the design and functionality of O-ring face seal connectors crafted from steel, applicable to tube outside diameters or hose inside diameters ranging from 6 mm to 38 mm.

How work and connect in hydraulic fluid power system?

In fluid power systems, the transmission and control of power occur through a fluid (either liquid or gas) under pressure within a sealed circuit. In typical applications, fluids may be conveyed under pressure.

Connectors and conductors (tubes and hoses) facilitate the connection of components through their ports. Tubes serve as rigid conductors, while hoses function as flexible conductors.

What use for ISO 8434-3 O-ring face seal ORFS connectors?

ISO 8434-3 specifies O-ring face seal (ORFS) connectors designed for utilization in both fluid power systems and general applications, adhering to the defined limits of pressure and temperature as outlined in the standard.

These ORFS connectors are intended for linking tubes and hose fittings to ports.

What is the typical connection?

Below is the typical example of a ISO 8434-3 O-ring face seal ORFS connection.

What need pay attention when install O-ring face seal ORFS connectors?

Installation of ORFS connectors onto other connectors or tubes should be performed without external loads. Tightening the connectors should be executed in accordance with either the specified number of wrenching turns or the recommended assembly torque.

Where will use O-ring face seal ORFS connectors?

ORFS connectors find widespread usage in the United States and are employed in hydraulic systems across various applications, including mobile and stationary equipment such as excavators, construction machinery, tunnel machinery, cranes, and more.

Does QC Hydraulics have compatible product for ISO 8434-3?

QC Hydraulics refers to this type of connectors as ORFS (O-ring face seal) adapters or connectors or fittings, and all ORFS parts specified in ISO 8434-3 are accessible through QC Hydraulics. Please feel free to reach out to us if you are interested.