ISO 16028:1999 download free.Hydraulic fluid power Flush-face type, quick-action couplings for use at pressures of 20 MPa (200 bar) to 31,5 MPa (315 bar) Specifications.
Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Quick-action couplings are used to join or separate quickly fluid conductor lines, without the use of tools or special devices.
1 Scope
ISO 16028 specifies the interface dimensions for interchangeability and specifies the performance requirements for hydraulic, flush-face type, quick-action couplings for use at pressures of 20 MPa (200 bar) to 31,5 MPa (315 bar).
Couplings in accordance with ISO 16028 are not designed to connect or disconnect under pressure.
NOTE Couplings in accordance with this International Standard provide for automatic sealing of the fluid pressure on the upstream side and on the downstream side when the coupling is disconnected.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of ISO 16028. For dated references, subsequent amendments to, or revisions of, any of these publications do not appty. However, parties to agreements based on ISO 16028 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 4397, Fluid power systems and components — Connectors and associated components — Nominal outside diameters of tubes and nominal inside diameters of hoses.
ISO 4399, Fluid power systems and components — Connectors and associated components — Nominal pressures.
ISO 5598, Fluid power systems arid components — Vocabulary.
ISO 7241-2, Hydraulic fluid power — Quick-action couplings — Part 2: Test methods.
3 Terms and definitions
For the purposes of ISO 16028, the terms and definitions given in ISO 5598 apply.
4 DImensional requirements
Hydraulic flush face quick-action couplings shall conform to the dimensions shown in Figure 1 and given in Table 1. The coupling size relates to the nominal inside diameter of the hose, in accordance with ISO 4397, that is recommended for use with the coupling.
5 Performance requirements
5.1 Hydraulic, flush-face, quick-action couphngs in accordance with ISO 16028 shall meet or exceed the performance requirements given in Table 2.
5.2 The operating pressure shall be verified by pressure impulse testing in accordance with ISO 7241-2 for
100 000 cycles in the coupled and uncoupled conditions.
5.3 The rated burst pressure shall be verified by testing in accordance with ISO 7241-2 for one cycle in the coupled and uncoupled conditions.
5.4 The pressure drop at rated flow shall be verified by testing in accordance with ISO 7241-2.
5.5 The fluid loss per disconnect shall be verified by spillage testing in accordance with ISO 7241-2.
5.6 The surge flow capability shall be verified by surge flow testing in accordance with ISO 7241-2.
5.7 Provisions for locking the coupling in the coupled condition, to reduce the probability of accidental
disconnect, shall be agreed upon between the manufacturer and the user.
6 Identification statement (Reference to this International Standard)
Use the following statement in test reports, catalogues and sales literature when electing to comply with ISO 16028:
“Dimensional and performance requirements in accordance with ISO 16028:1999, Hydraulic fluid power — Flush-face type, quick-action couplings for use at pressures of 20 MPa (200 bar) to 31,5 MPa (315 bar) — Specifications.”