NFPA T3.21.4

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Pneumatic valve – Pressure rating supplement to NFPA/T2.6.1 R2-2000, Fluidpower components – Method for verifying the fatigue and establishing theburst pressure ratings of the pressure containing envelope of a metal fluidpower pneumatic valve
Revision R2, March 15, 2000
Includes all amendments and changes through Reaffirmation Notice , 2014

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  • Revision:Revision R2, March 15, 2000
  • Published Date:January 2014
  • Status:Active, Most Current
  • Document Language:English
  • Published By:National Fluid Power Association ((NFPA))
  • Page Count:12
  • ANSI Approved:No
  • DoD Adopted:No
  • This standard provides:

    − test and statistical methods for generating fatiguedistribution data;

    − test and statistical methods for conducting a verification ofthe pressure ratings on pneumatic valves;

    − common requirements and an industry-wide philosophy in judgingone type of pressure capability for pneumatic valves;

    − uniform methods of product comparison.

    This standard limits conditions as follows:

    − constant amplitude, pressure induced loading of the elementsthat constitute or maintain the pressure containing envelope;

    − product life of at least 100,000 cycles;

    − defined conditions for pressure levels and pulsedurations;

    − temperatures from the charpy impact transition temperature tothe threshold of creep sensitivity;

    − environments which are chemically compatible with thematerials of the pressure containing envelope;

    − materials that are aluminum, magnesium, steel, iron, copperbased alloys, cobalt, titanium, stainless steels, nickel steels,and monel. Specifically excluded are creep sensitive materials suchas: zinc, plastic, rubber, and sealing devices. 

    This standard encourages manufacturers to use this common methodto enhance the credibility of their pressure ratings.