(NFPA) - NFPA T3.21.4
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
| Organization: | (NFPA) |
| Publication Date: | 15 March 2000 |
| Status: | active |
| Page Count: | 12 |
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 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.
This standard encourages manufacturers to use this common method to enhance the credibility of their pressure ratings.
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