NFPA (Fluid) 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

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 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 valves 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 components.

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;
pressure levels and pulse durations as defined in NFPA/T2.6.1 R2-2000;
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 more 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.

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