NFPA T3.5.26 : 2000 : R2009

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Units of measurement
5 Letter symbols
6 General background for fatigue verification
7 Program organization
8 Rated fatigue verification test program
9 Rated burst pressure test program
10 Establishing a failure distribution
11 Rating by similarity
12 Data presentation
13 Test/production similarity
14 Identification statement

Specifies: - 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 can be rated as integral parts of hydraulic valves or as an independent component.