This standard specifies the strength requirements and test methods for the seat system of agricultural transport vehicles. It is applicable to the seats and their fixing devices of agricultural transport vehicles. It is not applicable to folding additional seats, side seats and simple seats that do not meet the requirements of the seat definition. GB/T 9126-2003 Dimensions of non-metallic flat gaskets for pipe flanges GB/T9126-2003 standard download decompression password: www.bzxz.net

GB/T9126—2003
This standard is a revised version of GB/T9126.1~9126.4---1988 "Dimensions of asbestos rubber gaskets for steel pipe flanges". Corresponding to ISO7483:1991 "Dimensions of gaskets used for pipe flanges in ISO7005", the size modification of this standard adopts ISO7483 when the gasket type, nominal diameter and nominal pressure are the same. The main differences between this standard and the international standard are as follows: - Considering the domestic use, the scope of application of this standard is slightly different from ISO7483 (i.e. the nominal pressure and nominal diameter range);
The size series of narrow raised face sealing surface non-metallic flat gaskets (i.e. type II) that are widely used in China has been added. Compared with GB/T9126.1~9126.4—1988, the main changes of this standard are as follows: the original four size standards are merged into one;
Some sizes are modified according to ISO7483:1991; the applicable scope of the standard is expanded.
This standard replaces GB/T9126.1~9126.4—1988 from the date of implementation. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Pipeline Accessories. The drafting units of this standard are: Mechanical Science Research Institute, Taicang BMW Sealing Materials Co., Ltd., Zhangjiagang Haiguo Petrochemical Machinery Manufacturing Co., Ltd., Wuxi Benda Sealing Factory, Beijing Huaguang Petrochemical Pipe Fittings Factory and Nanjing University of Technology. The main drafters of this standard are: Chen Lin, Ye Baolong, Zhang Lin, Zhao Zhijun, Tian Yuqiu, Ma Zhigang, Gu Boqin, Li Junying. This standard was first issued in 1988 and revised for the first time in 2003. Scope
Non-metallic flat gaskets for pipe flanges
This standard specifies the types and dimensions of non-metallic flat gaskets for pipe flanges. GB/T9126—2003
This standard applies to non-metallic flat gaskets for flat, raised, concave and convex and grooved pipe flanges with nominal pressures of PNO.25 to PN5.0MPa.
Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions are applicable to this standard. GB/T9129 Technical conditions for non-metallic flat gaskets for pipe flanges 3 Types and sizes of gaskets
3.1 The type of non-metallic flat gaskets for pipe flanges with flat sealing surfaces (code FF) of PNO.25, PNO.6, PN1.0, PN1.6 and PN2.0 MPa shall comply with the provisions of Figure 1, and the size shall comply with the provisions of Table 1. 3.2 The type of non-metallic flat gaskets for pipe flanges with raised sealing surfaces (code RF) of PNO.25, PNO.6, PN1.0, PN1.6, PN2.0, PN4.0 and PN5.0 MPa shall comply with the provisions of Figure 2, the size of type I gaskets shall comply with the provisions of Table 2, and the size of type II gaskets shall comply with the provisions of Table 3.
Note: Type I gaskets are suitable for general flange sealing surfaces, and type II gaskets are suitable for narrow flange sealing surfaces. 3.3 The type of non-metallic flat gaskets for pipe flanges with concave and convex sealing surfaces (codenamed MF) of PN1.6, PN2.5, PN4.0 and PN5.0 MPa shall comply with the provisions of Figure 2, and the size shall comply with the provisions of Table 4. 3.4 The type of non-metallic flat gaskets for pipe flanges with grooved sealing surfaces (codenamed TG) of PN1.6, PN2.5, PN4.0 and PN5.0 MPa shall comply with the provisions of Figure 2, and the size shall comply with the provisions of Table 5. Net
888888
GB/T 9126--2003
100115
125141
150169
200220
700712
800813
900915
1000 1016
12001220
14001420
16001620
1800/1820
2000/2020
0.25(2.5)
Use PNO.6 MPa
Dimensions
Table 1 Dimensions of non-metallic flat gaskets for flat pipe flanges Nominal pressure
130100
160130
190150
240200
265225
Diameter
Use PNi.6 MPa
's scale
1115|1050
1230|1160
5513801
2115|2020
640585
1125/1050
23252230148148
When PN is 2.0MPa and DN is 65mm, the inner diameter d of the gasket is 73mm2
234522306048
Unit is millimeter
MPa(bar)
2.0(20）
130 198.0
180 139. 5
Dimensions of nominal gasket
0.25(2.5)
Dimensions of non-metallic flat gaskets for raised face pipe flanges
1.6(16)2.0(20)2.5(25)
1.0(10）
PN4. 0 MPa
Dimensions of PN4. 0 MPa
Dimensions of gasket
When PN is 2.0 and 5.0 MPa and DN is 65 mm, the inner diameter d of the gasket is 73 mm. D.
PN4. 0 MPa
Dimensions
GB/T9126--2003
Unit is millimeter
MPa(bar)
GB/T9126—2003
Nominal diameter
Dimensions of non-metallic flat gaskets for type II raised face pipe flanges Gasket inner diameter
Nominal pressure PN
Gasket outer diameter D.
MPa(bar
Unit is millimeter
Gasket thickness
Nominal diameter
Gasket inner diameter
Table 4 Dimensions of non-metallic flat gaskets for concave and convex face pipe flanges Nominal pressure PN
Gasket outer diameter D.
Dimensions for PN4.0MPa
Dimensions for PN4.0MPa
Dimensions for PN2.5MPa
Dimensions
When PN is 5.0MPa and DN is 65mm, the inner diameter d of the gasket is 73mm. 149
GB/T9126—-2003
Unit: mm
MPa(bar)
Gasket thickness
GB/T9126—2003
Nominal diameter
Table 5 Dimensions of non-metallic flat gaskets for grooved pipe flanges Nominal pressure PN
Gasket inner diameter d
MPa(bar)
Unit: mm
4.0(40)5.0(50)
Gasket outer diameter D.
PN4. 0 MPa
PN4. 0 MPa
Dimensions
PN2.5 MPa
Dimensions
Dimensions
Gasket thickness
Technical requirements
Technical requirements for gaskets shall comply with the provisions of GB/T9129. 5 Marking
Marking method
Gasket standard number
GB/T 9126—2003
Nominal pressure (marked by bar value)
Nominal diameter
Flange sealing surface code
Note: When Type ⅡI non-metallic flat gaskets are used for raised face pipe flanges, "Type Ⅱ" should be indicated when marking; when "Type I" gaskets are used, no special marking is required. 5.2 Marking examples
a) Non-metallic flat gaskets for flat pipe flanges with a nominal diameter of 50 mm and a nominal pressure of 1.0 MPa are marked as non-metallic flat gaskets FFDN50-PN10GB/T9126. Non-metallic flat gaskets for raised face (type II) pipe flanges with a nominal diameter of 65 mm and a nominal pressure of 1.0 MPa are marked as: b) wwW.bzxz.Net
Non-metallic flat gaskets RF (type II) DN65-PN10GB/T 9126
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