1 Scope
This standard specifies the main structure, technical requirements, test methods, inspection rules as well as marking, packaging, storage and transport of automatic brake valve for derailment of railway freight car (hereafter referred to as derailment brake valve).
This standard is applicable to the manufacture and inspection of derailment brake valve.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 1184 Geometrical Tolerancing - Geometrical Tolerances for Features Without Individual Tolerance Indications (GB/T 1184-1996, eqv ISO 2768-2:1989)
GB/T 1804 General Tolerances - Tolerances for Linear and Angular Dimensions Without Individual Tolerance Indications (GB/T 1804-2000, eqv ISO2768-1: 1989)
GB/T 5270-2005 Metallic Coatings on Metallic Substrates - Electrodeposited and Chemically Deposited Coatings - Reviews of Methods Available for Testing Adhesion (ISO 819: 1980 IDT)
GB/T 9441 Metallographic Test for Spheroidal Graphite Cast Iron
GB/T 10125-1997 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests (eqv ISO 9227: 1990)
GB/T 18684 Specifications of Zinc/Chromate Coatings
GSB 05-1426 Color Standard Sample Card for Paint Film
TB/T 1465 General Specification of Spheroidal Graphite Iron Castings for Rolling Stock
YB/T 5058 Cold-rolled Spring and Tool Steel Strips
3 Main Structure and Model
Derailment brake valve mainly consists of brake valve spindle, shrapnel, actuating rod, adjustment lever (pre-beam subassembly), valve body, and locknut and pull ring (see Figure 1). In case of vehicle derailment, the derailment brake valve will exhaust the pressure air in train pipe to atmosphere in an automatic and timely manner, thus bringing the derailed vehicle to a rapid stop and effectively reducing the loss caused by long stopping distance.
Foreword i
1 Scope
2 Normative References
3 Main Structure and Model
4 Technical Requirements
5 Test Methods
6 Inspection Rules
7 Marking, Packaging, Storage and Transport
