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ISO , Fluid power systems and components Three-pin electrical plug connectors with earth contact Characteristics and requirements. ISO , Hydraulic fluid power Particulate contamination analysis Extraction of fluid samples from lines of an operating system. ISO , Fluid power systems and components Vocabulary.
ISO , Fluid power systems and components Two-pin electrical plug connector with earth contact Characteristics and requirements. ISO , Hydraulic fluid power Four-port modular stack valves and four-port directional control valves, sizes 02, 03 and 05 Clamping dimensions. ISO , Metallic tube connections for fluid power and general use Part 1: 24 compression fittings. ISO , Metallic tube connections for fluid power and general use Part 2: 37 flared fittings. Revision of ISO 2 To be published.
Revision of ISO ISO , Metallic tube connections for fluid power and general use Part 3: O-ring face seal fittings. ISO , Metallic tube connections for fluid power and general use Part 4: 24 cone connectors with O-ring weld-on nipples.
ISO , Hydraulic fluid power Plain-end, seamless and welded precision steel tubes Dimensions and nominal working pressures. The supplier shall be responsible for ensuring that the translation has the same meaning as the original text. This assessment may include the influence of the fluid power. Standards listed in annex B may be used in this assessment.
So far as is practicable, the hazards identified shall be eliminated by design and, where this is not practicable, the design shall incorporate safeguards against such hazards. In each case, components shall be selected, applied, fitted and adjusted so that in the event of a failure, safety of personnel shall be the prime consideration. The prevention of damage to the system and the environment shall be considered.
Components shall be selected or specified to operate reliably under all intended uses of the system. Particular attention shall be paid to the reliability of components that could cause a hazard in the event of their failure or malfunction.
The preferred means of protection against excessive pressure are one or more pressure relief valves located to limit the pressure in all parts of the system.
Alternative means, such as pressure compensator pump controls, may be used, provided those means satisfy the application requirements. Systems shall be designed, constructed and adjusted to minimise surge pressures and intensified pressures. Surge pressures and intensified pressures shall not cause hazards. Loss of pressure or critical drop in pressure shall not expose persons to a hazard. Examples of information required are a. The following information shall be included on or with the circuit diagram: a.
This unique item number shall be used to identify the component on all diagrams, lists and layouts. It should be clearly and permanently marked on the installation adjacent to, but not on, the component. The order of stacking modules shall be clearly indicated adjacent to, but not on, the stack. The identification shall correspond to the data on the circuit diagram. When components have standard port identifications applied by the component supplier, these shall be supplemented by identifications corresponding to the circuit diagram see 5.
The function plate information shall be relevant and easily understood, providing positive identification of system function controlled. Components made in accordance with recognised international or national standards should be selected. Hydraulic components including piping shall be accessible and fitted so as not to interfere with adjustment or maintenance.
Particular attention shall be given to the location of systems and components that need regular maintenance. The installation height of the bottom edge of a component should normally be at least 0,6 m above the working platform, and the top edge not more than 1,8 m above the working platform. The fluid temperature shall not exceed that at which it can reliably be used and be within the specified working temperature range of any component in the system.
All drive shafts and couplings shall be suitably guarded. Drains, air bleeds and auxiliary ports shall be so installed that they do not allow ingress of air into the system and shall be so dimensioned and installed that no excessive back pressure will be generated. High pressure air bleeds shall be installed so as to minimise the hazard to persons. NOTE Cylinder pressure ratings may reflect only the capability of the pressure-containing envelope and not the force transmitting capability of mounting configurations.
The supplier or manufacturer should be consulted for mounting configuration ratings. The mounting shall minimise the following conditions: a. The cylinder shall be mounted to enable ease of access for maintenance, adjustment to cushioning devices and complete unit replacement. As far as possible the fasteners should be free from shear forces. Foot mounted cylinders should have means to absorb shear loads, rather than depending on mounting fasteners.
The mounting fasteners shall be adequate to absorb overturning moments. The cylinder shall be mounted in a way that avoids unintended side loads during operation. Piston rods should be protected against foreseeable damage from dents, scratches, corrosion, etc. Protective covers may also be provided. For assembly purposes, piston rods with male or female screwed ends shall be provided with flats to suit standard wrenches. Flats on the piston rods may be omitted in cases where the rods are too small to allow provision of the flats.
In special situations where pressure is required after the machine is shut down, the above requirements need not be fulfilled. The gas-loaded accumulator and any associated pressurised components shall be applied within the rated limits of pressure, temperature and environmental conditions. Protection against excessive pressure on the gas side may be required in special circumstances.
Depressurise system before maintenance. Duplicate information shall be provided on the circuit diagram. If gas-loaded accumulator liquid pressure isolation is required by design when the system is shut off, complete information for safe servicing shall be referenced on or near the accumulator in a visible location.
A gas-loaded accumulator shall be installed according to the instructions of the accumulator supplier and be accessible for ease of maintenance. Only apparatus and procedures recommended by the supplier for gas pre-charging of accumulators shall be used.
The charging medium shall be nitrogen or other suitable gas. Pressure checks shall be carried out by the method recommended by the accumulator supplier. Care shall be taken not to exceed the rated pressure of the accumulator. After any check or adjustment there shall be no leakage of gas. Before disassembly of the gas-loaded accumulator commences it shall be fully depressurised on both liquid and gas sides.
Internal passages, including cored and drilled holes, shall be free of detrimental foreign matter, such as scale, burrs, swarf, etc. IEC For hazardous operating conditions, the appropriate degree of protection e. Electrical connections to valves should be separable, oil-tight, plug-in connector conforming to ISO or ISO Solenoids shall be protected against the entry of extraneous fluid or dirt in accordance with IEC These shall be designed or selected so that they cannot be operated inadvertently, and they shall reset when the manual control is removed, unless otherwise specified.
Associated piping or connectors may be loosened to provide removal clearance. Fluids should be described in accordance with recognized International Standards.
Where a fire hazard exists, consideration shall be given to the use of a fire-resistant fluid. Supplementary information shall be supplied if needed to ensure that the following points are included: a. All fluid and lubricant fill openings shall be clearly and permanently marked. Special attention should be paid to fire-resistant fluids. If the fluid reservoir is of the pressure-sealed type then the special requirements of that type of unit shall be considered.
The reservoir circulation shall not promote the entrainment of air;. The covers shall provide access to all internal areas for cleaning and inspection;. When such finishes are not used, ferrous interior surfaces should be coated with a rust inhibitor compatible with the fluid;. The lifting points should be identified.
The contamination level shall be expressed in accordance with ISO The use of a separately pumped filtration system should be given due consideration.
This device shall be readily visible to the operator or maintenance personnel. In severe cases, damping devices should be installed. Inlet screens or strainers are acceptable. If used, suction filtration devices shall be equipped with an integral bypass valve to limit the maximum pressure drop at rated system flow to a value that ensures that the requirements of 6.
An electrical device is recommended to indicate unacceptable pump inlet pressure or to enable automatic system shut down. Particular attention should be paid to this under cold start conditions. Cooling media control valves should be on the input line. Shut-off valves shall be provided in the cooling medium lines for maintenance. The heat exchanger shall be protected from corrosion caused by the cooling media.
Measuring points should include provisions for permanent installation of sensors and for service without loss of fluid. Automatic thermal controls shall be applied to maintain the desired hydraulic fluid temperature. ISO specifies general rules and safety requirements for hydraulic fluid power systems and components used on machinery as defined by ISO ISO deals with all significant hazards associated with hydraulic fluid power systems and specifies the principles to apply in order to avoid those hazards when the systems are put to their intended use.
ISO applies to the design, construction and modification of systems and their components, also taking into account the following aspects: assembly, installation, adjustment, uninterrupted system operation, ease and economy of maintenance and cleaning, reliable operation in all intended uses, energy efficiency and environment.
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