NFPA/T3.21.4 R2-2000 (R2014)
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NFPA/T3.21.4 R2-2000 (R2014)Standard Title: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 valveReferenced Standards:NFPA/T2.6.1 R2, ISO 1000, ASTM E466, ISO 5598Standard Scope: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. This standard limits the conditions as follows: constant amplitude, pressure induced loadings of the elements that constitute or maintain the pressure containing envelope; product life of at last 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. This standard encourages manufacturers to use this common method to enhance the credibility of their pressur ratings.