GB/T 38008-2019Gate valves of thermoplastics materials (English PDF)

16139.2006 Industrial Valves - Gate Valves of Thermoplastics Materials.

In comparison with ISO 16139.2006, this Standard has the following structural changes.

---"Symbols" is added to "Terms and Definitions" (see 3.4);

---Chapter 4 "Requirements" of ISO 16139.2006 are divided into "Materials",

"Design" and "Requirements" (see Chapter 4 ~ Chapter 6);

---The contents of 4.7.2 and 4.8 in ISO 16139.2006 are deleted;

---Chapter 5 "Inspection Procedures" of ISO 16139.2006 is divided into "Test

Methods" and "Inspection Rules" (see Chapter 7 and Chapter 8);

---Chapter 6 of ISO 16139.2006 is deleted;

---Chapter 7 "Markings" and Chapter 8 "Transportation and Storage" of ISO

16139.2006 are combined into "Markings, Packaging, Transportation and

Storage" (see Chapter 9);

---The comparison between nominal outer diameter dn and nominal size DN is

added (see Appendix A);

---Appendix A of ISO 16139.2006 is adjusted to Appendix B.

In comparison with ISO 16139.2006, the main technical differences and the causes for

these differences are as follows.

---The pressure class is deleted (see Chapter 1), and uniform use of metric units

is adopted;

---In terms of Normative References, this Standard makes specific adjustments

with technical differences, so as to adapt to the technical conditions of China.

The condition of the adjustments is intensively reflected in Chapter 2

"Normative References". See the specific adjustments below.

 GB/T 7306.1-2000 and GB/T 7306.2-2000, which equivalently adopt

international standard, are used to replace ISO 7-1.1994 (see 6.3.1.3);

 GB/T 12222-2005, which modifies and adopts international standard, is

used to replace ISO 5210.2001 (see 5.3.2);

 GB/T 27726-2011, which modifies and adopts international standard, is

used to replace ISO 9393-2.2005 (see 6.4);

 Appendix A of GB/T 28494-2012, which modifies and adopts international

standard, is used to replace EN 12570.2000 (see 5.4.2);

 Appendix B of GB/T 28494-2012, which modifies and adopts international

standard, is used to replace ISO 8233.1998 (see 7.8);

 Appendix C of GB/T 28494-2012, which modifies and adopts international

standard, is used to replace ISO 8659.1999 (see 7.9);

 ISO 228-1.2000, ISO 898-1.1999, ISO/TR 10358.1993, ISO 12092.2000,

ISO 12162.1995, EN 558-1.1995, EN 558-2.1995, EN 736-1.1995, EN

736-2.1997, EN 736-3.1999, EN 1092-1.2001, EN 1267.1997, EN 1759-

1.2004, EN 12107.1997 and EN 12266-1.2003, which are not quoted in the

Standard, are deleted;

 The reference of GB/T 2828.1-2012 is added (see 8.3.2);

 The reference GB/T 2918-2018 is added (see 7.1);

 The reference of GB/T 8806-2008 is added (see 7.3);

 The reference of GB/T 17219 is added (see 6.11);

 The reference of GB/T 19278-2018 is added (see Chapter 3);

 The reference of GB/T 21300-2007 is added (see 7.10);

 The reference of GB/T 30832-2014 is added (see 7.6);

---The requirements for shell materials "PPO/PPE, PPSU and PA" are added (see

4.1);

---The requirements of 4.1.2 b) in ISO 16139.2006 are modified. in accordance

with the definitions of terms in GB/T 19278-2018, the dimensional requirements

for clearway valve, full bore valve and reduced bore valve are provided (see

6.3.2);

---The number of cycles of fatigue strength of gate valves with dn < 63 mm is raised

from 5,000 times to 15,000 times; the number of cycles of fatigue strength of

gate valves dn >= 63 mm is 5,000 times, which is consistent with that in ISO

16139.2006 (see 6.9).

This Standard makes the following editorial modifications.

---The title of this Standard is modified into Gate Valves of Thermoplastics

Materials;

---The specifications and dimensions are expressed in nominal outer diameter dn

(see Chapter 1);

---This Standard incorporates the amendments of ISO 16139.2006 / FD Amd I and

modifies the derating factor fr. The clauses involved in these amendments have

been marked by a vertical double line () on the outer margin (see Table 1 of

4.3.2).

Please be noted that certain content of this document might involve patents. The

institution issuing this document does not undertake the responsibility of identifying

these patents.

This Standard was proposed by China National Light Industry Council.

This Standard shall be under the jurisdiction of National Technical Committee 48 on

Plastic Products of Standardization Administration of China (SAC/TC 48).

The main drafting organizations of this Standard. Shanghai Sanshang Xinbang

Technology Co., Ltd.; Beijing Building Materials Testing Academy Co., Ltd. (National

Water-saving Appliance Product Quality Supervision and Inspection Center); Yonggao

Co., Ltd.; Zhejiang Zhongcai Pipes Technology Co., Ltd.; NAM SOK Building Material

& Plastic Products (Shenzhen) Co., Ltd.; Cangzhou Mingzhu Plastics Co., Ltd.;

Shanghai White Butterfly Pipe Technology Co., Ltd.; China Lesso Group Holdings

Limited; Baolu Seven Star Pipe Industry Co., Ltd.; Shanghai Tianli Industry (Group)

Co., Ltd.; Zhejiang Xinda Plastic Pipe Co., Ltd.