ISO 8434 consists of the following parts, under the general title Metallic tube connections for fluid power and general use:
⎯Part 1: 24° cone connectors
⎯ Part 2: 37° flared connectors
⎯ Part 3: O-ring face seal connectors
⎯ Part 4: 24° cone connectors with O-ring weld-on nipple
⎯ Part 6: 60° cone connectors with or without O-ring sealing
Today this blog will give you a comprehensive introduction about ISO 8434-3 standard.
ISO 8434-3 ORFS Connectors
This part of ISO 8434-3(also known as SAE J453 standard specifies the general and dimensional requirements for the design and performance of O-ring face seal connectors made of stainless steel or steel for tube outside diameters or hose inside diameters of 6 mm through 38 mm, inclusive. These connectors are for use in fluid power and general applications where elastomeric seals can be used to prevent fluid leakage, including leakage caused by variations in assembly procedures. They are intended for the connection of tubes and hose fittings to ports in accordance with ISO 6149-1.
These connectors provide leakproof, full-flow connections in hydraulic systems operating from a vacuum of 6,5 kPa [0,065 bar 3)] absolute pressure to the working pressures shown in Table 1. Because many factors influence the pressure at which a system performs satisfactorily, these values shall not be understood as guaranteed minimums. For every application, it is recommended that sufficient testing be conducted and reviewed by both the user and manufacturer to ensure that required performance levels are met. Both metric and inch tubing can be accommodated by changing the sleeve. In the past, these
connectors have been used predominantly with inch tubing. For new and future designs, the use of metric
tubing is preferred.
This part of ISO 8434-3 also specifies a performance and qualification test for O-ring face seal connectors.
ISO 8434-3: Connector Bodies
Bodies shall be manufactured from stainless steel or carbon steel that will provide the minimum pressure/temperature requirements specified in Clause 5, when tested in accordance with Clause 15. They shall have characteristics that make them suitable for use with the fluid to be conveyed and that will provide an effective joint. Weld-on sleeves shall be made of materials classified as suitable for welding.
ISO 8434-3: Nuts & Sleeves
Nuts to be used with carbon steel bodies shall be made of carbon steel and those for use with stainless steel bodies shall be made of stainless steel unless otherwise specified. Nuts to be used with copper alloy bodies shall be made of a material similar to the bodies.
Sleeves shall be manufactured from a material similar to the bodies.
ISO 8434-3: O-ring
Unless otherwise specified, for use with petroleum-based hydraulic fluids at the pressure and temperature
requirements in Clause 5 and Table 1 and for testing, the O-rings shall be made of NBR (nitrile) with a
hardness of (90 ± 5) IRHD, measured per ISO 48, and shall conform to the dimensions given in Table 6 and shall meet or exceed the O-ring quality acceptance criteria for grade N of ISO 3601-3:—. In those cases, where the pressure and temperature requirements of this part of ISO 8434 and/or the hydraulic fluid used in the system differ from those specified in Clause 5 and Table 1, the connector manufacturer shall be consulted to ensure that an appropriate O-ring material is selected.
ISO 8434-3: Requirements for tubes
The connectors shall be suitable for use with tubes with limits of outside diameter as given in Tables 2
and 3. These limits include ovality.
Metric tubing shall be preferred. Tubing shall comply with the relevant dimensions given in Table 2 or 3.
Carbon steel tubes shall, except for dimensions of inch tubes, comply with ISO 3304 (seamless
cold-finished as-drawn or annealed or normalized) or ISO 3305 (welded cold-finished as-drawn or annealed or normalized).
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