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NFPA/T3.5.26 R2-2000 (R2019)
Hydraulic 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 hydraulic valve
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 fluid power hydraulic valves; common requirements and an industry-wide philosophy in judging one type of pressure capability for hydraulic valves typically used in fluid power applications; uniform methods of product comparison; hydraulic valve(s) may contain one or more pressure zones. Each pressure zone may have pressure ratings based on a maximum differential pressure to an adjacent lower pressure zone or atmosphere; attachments (see 3.3) can be rated as integral parts of hydraulic valves or as an independent component. 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; pressure levels and pulse durations as defined in NFPA/T2.6.1 R2-2000; temperatures from the charpy impact transition temperature to 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 more 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.
National Fluid Power Association [nfpa-fluid]