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ISO Standards Help Users Of Fluid Power Deal With Pressure
Four new international technical standards have recently been published and
are now available from the National Fluid Power Association (NFPA).
Valves that control pressure play an important role in hydraulic systems, and
the second edition of an ISO standard that helps to ensure interchangeability
of these valves has just been published. ISO 5781:2000, Hydraulic fluid power
? Pressure-reducing valves, sequence valves, unloading valves, throttle valves
and check valves ? Mounting surfaces, specifies the dimensions and other characteristics
of surfaces on which these types of valves are mounted. The standard applies
to valves that are generally used in industrial equipment.
Buyers of compressed air pressure regulators and filter-regulators will find
it easier to compare characteristics of components that come from different
suppliers, if those suppliers comply with the two parts of ISO 6953: ISO 6953-1:2000,
Pneumatic fluid power ? Compressed air pressure regulators and filter-regulators
? Part 1: Main characteristics to be included in literature from suppliers and
product-marking requirements specifies the characteristics of compressed air
pressure regulators to be included in literature from companies that supply
these components. In addition, it specifies product marking requirements for
pressure regulators and filter-regulators. ISO 6953-2:2000, Pneumatic fluid
power ? Compressed air pressure regulators and filter-regulators ? Part 2: Test
methods to determine the main characteristics to be included in literature from
suppliers specifies tests, test procedures and a method of presenting the results
related to the main characteristics specified in ISO 6953-1 to be included in
literature from suppliers of regulators and filter-regulators.
Sometimes people find it necessary to diagnose a hydraulic system while it
is pressurized. A new ISO standard provides the dimensions of a coupling that
allows for that. ISO 15171-2:2000, Connections for fluid power and general use
? Hydraulic couplings for diagnostic purposes ? part 2: Coupling with M16 x
2 end for connection under pressure, specifies dimensions, performance requirements
and test procedures for a diagnostic coupling with an M14 x 1,5 straight stud
end to mate with an ISO 6149-1 port and an M16 x 2 connection end that can be
connected under pressure without tools to a maximum pressure of 40 MPa (400
bar). The dimensions of the coupling counterpart are also specified. The coupling
is designed for use in hydraulic systems that use mineral oil.
To order any or all of these documents, contact NFPA's publications department
by phone at 414-778-3353
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