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NFPA (Fluid) T3.21.4 R2-2000 (R2019)

M00016025

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NFPA (Fluid) T3.21.4 R2-2000 (R2019) Pneumatic valve - Pressure rating supplement to NFPA/T2.6.1 R2-2000, Fluid power components - Method for verifying the fatigue and establishing the burst pressure ratings of the pressure containing envelope of a metal fluid power pneumatic valve

standard by National Fluid Power Association, 03/15/2000

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1.1 This standard provides:

- test and statistical methods for generating fatigue distribution data;
- test and statistical methods for conducting a verification of the pressure ratings on pneumatic valves;
- common requirements and an industry-wide philosophy in judging one type of pressure capability for pneumatic valves;
- uniform methods of product comparison.

1.2 This standard limits conditions as follows:

- constant amplitude, pressure induced loading of the elements that constitute or maintain the pressure containing envelope;
- product life of at least 100,000 cycles;
- defined conditions for pressure levels and pulse durations;
- temperatures from the charpy impact transition temperature to the threshold of creep sensitivity;
- environments which are chemically compatible with the materials of the pressure containing envelope;
- materials that are aluminum, magnesium, steel, iron, copper based alloys, cobalt, titanium, stainless steels, nickel steels, and monel. Specifically excluded are creep sensitive materials such as: zinc, plastic, rubber, and sealing devices.

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