GB 33146-2025Valves for liquefied dimethyl ether cylinders (English PDF)

3 Terms and definitions

4 Model designation

5 Design requirements

6 Technical requirements

7 Inspection and test methods

8 Inspection rules

9 Marking, packaging, storage and transport

10 Implementation of the standard

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 33146-2016, Valves for liquefied dimethyl ether cylinders. In addition to structural adjustments and editorial changes, the main technical changes compared with GB/T 33146-2016 are as follows:

a) the term "non-detachable valve" has been deleted (see 3.1 of the 2016 edition);

b) the terms "reference state" and "rated cut-off flow" have been added (see 3.1 and 3.2);

c) the model designation has been changed (see Clause 4; Clause 4 of the 2016 edition);

d) requirements for the design of the valve sealing structure have been added (see 5.2);

e) requirements for the structural design of the excess flow cut-off device have been added (see 5.3 and 5.4);

f) a requirement for the inlet diameter of the liquid-phase valve has been added (see 5.8);

g) the specification of the liquid-phase pipe connection thread of the liquid-phase valve has been changed (see 5.10; 5.5 of the 2016 edition);

h) requirements and test methods for smart valves have been added (see 5.11 and Annex A);

i) requirements for the mechanical properties of the materials of main parts and components have been added (see 6.1.1.1);

j) requirements for the mechanical properties of rubber seals have been added (see 6.1.2.1);

k) the requirement for the weight deviation of the valve has been changed (see 6.2.4; 6.2.4 of the 2016 edition);

l) requirements for the cut-off performance of the excess flow cut-off device and for its durability have been added (see 6.3.4 and 6.3.6.2);

m) the requirement for the minimum design service life has been changed (see 6.4; 6.4 of the 2016 edition);

n) the chemical analysis methods for the materials of main parts have been changed (see 7.2; 7.2 of the 2016 edition);

o) the requirement for the conditioning time in air for weight loss has been changed (see 7.3.3.2; 7.3.3.2 of the 2016 edition);

p) the test method for temperature resistance has been changed (see 7.11; 7.10 of the 2016 edition);

q) the requirements for re-inspection of the materials of main parts and of non-metallic seals have been changed (see 8.1.2 and 8.1.3; 8.1.2 of the 2016 edition);

r) the requirements for type testing have been changed (see 8.3.1; 8.3.1 of the 2016 edition);

s) the sampling method and judgement have been changed (see 8.3.2; 8.3.2 of the 2016 edition);

t) the requirements for valve marking have been changed (see 9.1.1; 9.1.1 of the 2016 edition);

u) the requirements for the product certificate of conformity have been changed (see 9.1.3; 9.1.3 of the 2016 edition);

v) requirements for electronically readable marking of the valve have been added (see 9.1.3);

w) requirements for the public information website and factory documents have been added (see 9.3).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This document was proposed by and is under the jurisdiction of the State Administration for Market Regulation.

This document was first published in 2016; this is the first revision.