NFPA publishes standard on pneumatic fluid power.
Press Release Summary:
ISO 6358-2:2013 Pneumatic fluid power – Determination of flow-rate characteristics of components – Part 2: Alternative test methods specifies discharge test and charge test as alternative methods for testing pneumatic fluid power components that use compressible fluids. It does not apply to components whose flow coefficient is unstable during use. In addition, document does not apply to components that exchange energy with fluid during flow-rate measurement.
Original Press Release:
New Technical Standard Now Available from NFPA
Milwaukee, WI -Â A new technical document has recently been published and is now available from the National Fluid Power Association (NFPA).
ISO 6358-2:2013 (supersedes ISO 6358:1989) Pneumatic fluid power – Determination of flow-rate characteristics of components – Part 2: Alternative test methods
Scope:
This part of ISO 6358 specifies a discharge test and a charge test as alternative methods for testing pneumatic fluid power components that use compressible fluids, i.e. gases, and that have internal flow passages that can be either fixed or variable in size to determine their flow-rate characteristics. However, this part of ISO 6358 does not apply to components whose flow coefficient is unstable during use, i.e. components that exhibit remarkable hysteretic behavior (because they can contain flexible parts that deform under flow) or that have an internal feedback phenomenon (such as regulators) or components that have a cracking pressure such as non-return (check) valves and quick-exhaust valves. In addition, it does not apply to components that exchange energy with the fluid during flow-rate measurement, e.g. cylinders, accumulators, etc.
The charge test cannot be performed on components that do not have downstream port connections.
Benefits:
ISO 6358-2 will help 1) a manufacturer determine characteristics for publication in a catalog, and 2) a system designer understand what the characteristics mean in order to compare pneumatic valves from various suppliers. The standard provides information superior to the traditional CV values.
NFPA list price:
$178.00
NFPA member price:
$141.00
NFPA provides a forum for the fluid power industry¡¦s channel partners¡Xmanufacturers, suppliers, distributors, customers and educators. Its U.S. and multinational members work cooperatively in advancing hydraulic and pneumatic technology through the association¡¦s many programs and initiatives. NFPA coordinates standards development for fluid power at the industry and international levels. These standards are intended as guides to aid the manufacturer, the consumer, and the user.
