ISO 8434 consists of the following parts, under the general title Metallic tube connections for fluid power and general use:
⎯ 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 sealingg
Today this blog will give you a comprehensive introduction about ISO 8434-1 standard.
ISO 8434-1: 24° cone connectors
This part of ISO 8434(as known as DIN 2353 in DIN standard) specifies the general and dimensional requirements for 24° cone connectors using
cutting ring and O-ring seal cone (referred to as DKO) suitable for use with ferrous and non-ferrous tubes with outside diameters from 4 mm to 42 mm inclusive. These connectors are for use in fluid power and general applications within the limits of pressure and temperature specified in this part of ISO 8434.
They are intended for the connection of plain end tubes and hose fittings to ports in accordance with
ISO 6149-1, ISO 1179-1 and ISO 9974-1.
ISO 8434-1: Connector bodies
Bodies shall be manufactured from stainless steel or carbon steel that will provide the minimum pressure/temperature requirements specified in Clause 5. They shall have characteristics that make them suitable for use with the fluid to be conveyed and that will provide an effective joint. Weld connector types and weld-on nipples shall be made of materials classified as suitable for welding.
For bodies manufactured from stainless steel and copper alloys, the pressure/temperature ratings need to be defined by the manufacturer.
ISO 8434-1: Nuts & Cutting Rings
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.
The ring material shall be compatible with the fluid to be conveyed and provide an effective joint.
Steel cutting rings are to be used in combination with other steel connector components and steel
tubes.
Stainless steel cutting rings are to be used in combination with other stainless steel connector
components and stainless steel tubes.
Brass cutting rings are to be used in combination with other brass connector components and copper
tubes.
Other combinations of materials shall be agreed upon between the purchaser and supplier.
ISO 8434-1: Weld Nipple
A complete weld-on nipple, including O-ring, with a light-duty connection end.
ISO 8434-1: O-rings
O-rings for use with connectors in accordance with this part of ISO 8434 shall be made of NBR (nitrile) with a hardness of (90 ± 5) IRHD, measured in accordance with ISO 48, and shall conform to the dimensions given in Table 5 and shall meet or exceed the O-ring quality acceptance criteria of ISO 3601-3:2005, grade N. 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. The connector manufacturer shall be consulted to ensure that an appropriate O-ring material is selected.
ISO 8434-1: Pressure/temperature requirements
Connectors in conformance with this part of ISO 8434 made of carbon steel shall meet or exceed
without leakage the requirements from a vacuum of 6,5 kPa (0,065 bar) absolute pressure to the working
pressures given in Tables 1 to 3 when used at temperatures between −40 °C and +120 °C with
petroleum-based hydraulic fluids.
Connectors complying with this part of ISO 8434 may contain elastomeric seals. Unless otherwise
specified, connectors are made and delivered with elastomeric parts giving their specified working
temperature range with petroleum-based hydraulic fluids. The connectors may have a reduced working
temperature range or may be completely unsuitable for applications with other fluids. Manufacturers may
supply on request connectors with appropriate elastomeric seals meeting the required working temperature range for use with different hydraulic fluids.
The connector assembly shall meet or exceed all applicable performance requirements given in
Clause 15. Testing shall be conducted at room temperature.
For applications under conditions other than the pressure and/or temperature limits given in Tables 1 to
3 and in 5.1 and 5.3, the manufacturer shall be consulted.
According to different applications and different pressure ratings, there are three series of connector,
designated by
⎯ LL, for extra light-duty,
⎯ L, light-duty, and
⎯ S, heavy-duty.
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